Calderas Cleaver Brooks

1. Produced by the Employees of
© Cleaver-Brooks Division, Aqua-Chem, Inc. 2002
The Boiler Book is protected by copyright and is to be used solely by consulting and
specifying engineers for the purpose of selecting and specifying Cleaver-Brooks
equipment. Any other use of The Boiler Book is strictly prohibited without written
permission from Cleaver-Brooks.
Cleaver-Brooks
P.O. Box 421
Milwaukee, WI 53201
(414) 359-0600
email: Iinfo@Cleaver-Brooks.com
www.cleaver-brooks.com
Printed in the U.S.A.
The Boiler Book
iii
Performance Proven Worldwide

2. The Boiler Book is intended for use by qualified engineering
professionals. All information contained herein is subject to
change without notice. Cleaver-Brooks is only responsible for
the accuracy of the information and data presented at time of
publication. Cleaver-Brooks shall not be responsible for the
use of this data or information nor for any systems, designs, or
engineering in which the data or information is utilized.
iv

3. TABLE OF CONTENTS
Firetube Boilers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section A
A1 – General
A2 – Model CB Boilers
A3 – Model CB (LE) Boilers
A4 – Model CBW Boilers
A6 – Model CB Ohio Special Boilers
A7 – Model CBE Boilers
A8 – Model CEW Boilers
A9 – Model CEW-LN Boilers
A10 – Model CEW Ohio Special Boilers
A11 – Model CBL Boilers
A12 – Model ICB Boilers
A13 – Model ICB-LN Boilers
Commercial Boilers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section B
B1 – Model FLX Boilers
B2 – Model 4 Boilers
B3 – Model 5 Boilers
B4 – Electric Boilers
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section D
Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section E
Stacks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section F
Economizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section G
Feedwater Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section H
H1 – Spraymaster Deaerators (Single Tank)
H2 – Spraymaster Deaerators (Duo Tank)
H3 – Boilermate Deaerators
H4 – Surge Tanks
H5 – Boiler Feed Systems
H6 – Chemical Feed Systems and Metering Pumps
H7 – Filters
H8 – Softeners
H9 – Dealkalizers
H10 – Blowdown Separators
H11 – Blowdown Heat Recovery Systems
H12 – Flash Tank Heat Exchangers
H13 – Sample Coolers
System Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section I
I1 – Boiler Selection Considerations
I2 – Hot Water Systems
I3 – Steam Systems
I4 – General Engineering Data
Glossary/Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section J
A5 – Discontinued
Industrial Watertube Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section C
B5 - TrueFire Boilers
B6 - ClearFire Boilers

4. A1-1
12-02
Model CB Boilers
Section A1
GENERAL
Model CBE Boilers
Model CB-LE Boilers
Model CB Ohio Special Boilers
A2
A3
A4
A5
A6
A7
Model CEW Boilers
Model CEW-LN Boilers
A8
A9
Model CEW Ohio Special Boilers A10
Model CBL Boilers A11
A12
A13
Model ICB Boilers
Model ICB-LN Boilers
A1_TEXT.fm Page 1 Tuesday, December 10, 2002 2:35 PM
Model CBH Boiler (discontinued)
Model CBW Boilers

5. A1-2
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12-02
FEATURES AND BENEFITS
The following Cleaver-Brooks firetube boiler models (CB,
CB-LE, CBW, CB Ohio Special) include the following fea-
tures and benefits.
Packaged Design with Integral Front Head:
• Integral front head provides proper burner/boiler
compatibility for maximum efficiency and ease of
maintenance.
• Packaged boiler is factory assembled, wired, and tested for
guaranteed performance and reliability.
• Packaged design allows for easy connection of utilities,
minimum start-up requirements, and lower long-term
maintenance requirements.
• Built and tested to ASME standards.
Single Point Positioning Combustion Control Package:
• Accurate, repeatable combustion control for responsiveness
to load swings.
• Single point linkage assembly for air and fuel simplifies
adjustments and reduces start-up and maintenance costs.
• Unique variable contour.cam assembly allows accurate
adjustment and enhances safe operation of the boiler.
• Computerized burner control provides accurate sequencing
and continuous monitoring for optimum safety, efficiency,
and reliability.
Low Stack Temperatures:
• Guaranteed efficiency verified by low stack temperatures.
• Reduced fuel and operating costs.
Low Excess Air:
• Operates at 3% O2 with less than 200 ppm CO for maximum
combustion efficiency.
• High efficiency and low maintenance requirements.
High Steam Quality:
• Large steam space and liberal surface area ensure high steam
quality, free from entrained particles of moisture.
• Provides reliable, high quality (98.5% dry) source of steam.
Quiet Operation:
• Integral front head with vibration free combustion air fan
provides quiet operation.
• Ideal for sound critical applications, like hospitals and
schools.
• Heavy duty motor with direct drive, maintenance free, case-
less fan.
• Integral forced draft fan eliminates the need for:
Large diameter breeching.
High chimneys.
Induced draft fans.
Barometric dampers.
Sequencing draft controls.
Thick Fiberglass Insulation:
• 2" insulation covered with sturdy sheet metal lagging
provides maximum efficiency and durable construction.
• All units finished with hard enamel paint coating.
Customer Service and Support:
• Boiler start-up, final adjustment, and operator training
provided with all firetube boilers.
• Emergency service response 24 hours a day, 7 days a week,
from the industry’s most advanced worldwide computerized
parts/service distribution network.
• Largest network of factory trained technicians provide:
System trouble shooting.
Operator training.
Customized factory-backed planned maintenance
programs.
Emergency boiler rental.
Total after-sale support.

6. A1-3
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12-02
PRODUCT OFFERING
Cleaver-Brooks firetube boilers are available in low pressure
steam, high pressure steam, and hot water designs. Burners are
available to fire natural gas, light oil, heavy oil, or a combina-
tion of oil and gas. Optional alternate fuel (propane, mixed
gas, digester gas, etc.) burners are also available.
The firetube product offering is available in the following
models.
The Model CB Boiler (standard offering) is the premium fire-
tube product offering providing maximum boiler efficiency,
the widest range of size and pressures, and premium control
packages.
• Four-pass dryback design.
• 15 hp through 800 hp.
• 150-350 psig high pressure steam.
• 15 psig low pressure steam.
• 30 or 125 psig hot water.
• Natural gas, light oil, or heavy oil firing.
The Model CB (LE) Boiler is the premium firetube product
offering with a low emission package.
• Four-pass dryback design.
• 125-800 hp.
• 20-60 ppm packages (natural gas).
• 15 psig low pressure steam.
• 150-300 psig high pressure steam.
• 30 and 125 psig hot water.
• Natural gas or light oil.
The Model CBW Boiler (standard offering) provides the
advantages of the Cleaver-Brooks integral front head in a
three-pass wetback design.
• Three-pass wetback design.
• 100 hp through 800 hp.
• 150-250 psig high pressure steam.
• 15 psig low pressure steam.
• 30 or 125 psig hot water.
• Natural gas, light oil, or heavy oil firing.
The Model CB Ohio Special Boiler (standard offering) design
is based on operator requirements of the state of Ohio, under
the rules and regulations for unattended units.
• 100 hp through 225 hp.
• Four-pass dryback design (100 hp).
• Two-pass dryback design (125-225 hp).
• 150, 200 and 250 psig high pressure steam.
• 15 psig low pressure steam.
• Natural gas or light oil firing.
The Model CBE Boiler (standard offering) provides high qual-
ity steam or hot water, utilizing a baseline boiler/burner design.
• Three-pass dryback design.
• 60-350 hp.
• 15 psig low pressure steam.
• 150-300 psig high pressure steam.
• 30 and 125 psig hot water.
• Natural gas or light oil.
The Model CEW Boiler (standard offering) provides high
quality steam or hot water, utilizing a baseline boiler/burner
design.
• Three-pass wetback design.
• 125-800 hp.
• 15 psig low pressure steam.
• 150-250 psig high pressure steam.
• 30 and 125 psig hot water.
• Natural gas or light oil.
The Model CEW-LN Boiler is the baseline firetube product
offering with a low emission package.
• Three-pass wetback design.
• 125-800 hp.
• 30 ppm package (natural gas).
• 15 psig low pressure steam.
• 150-250 psig high pressure steam.
• 30 and 125 psig hot water.
• Natural gas or light oil.

7. A1-4
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12-02
The Model CEW Ohio Special Boiler (standard offering)
baseline design is based on operator requirements of the state
of Ohio, under the rules and regulations of unattended units.
• Three-pass wetback design.
• 100-225 hp.
• 15 psig low pressure steam.
• 150-200 psig high pressure steam.
• Natural gas or light oil.
The Model CBL Boiler (standard offering) line provides high
quality steam utilizing a boiler/burner package.
• Three or four-pass wetback design.
• 800-1500 hp.
• 150-250 psig high pressure steam.
• Natural gas, light oil, or heavy oil firing.
The Model ICB Boiler is a baseline firetube product, designed
to provide high quality steam or hot water. Its revolutionary
design incorporates the key features and benefits of both the
wetback and dry back firetube boilers.
• Three or four-pass Intercooled design.
• 100 – 800 hp.
• 15 psig low pressure steam.
• 150 – 300 psig high pressure steam.
• 30 and 125 psig hot water.
• Natural gas or light oil firing.
The Model ICB-LN Boiler is a baseline firetube product,
designed to provide high quality steam or hot water with a low
emission package. Its revolutionary design incorporates the
key features and benefits of both the wetback and dry back
firetube boilers.
• Three or four-pass Intercooled design.
• 100 – 800 hp.
• 30 ppm package (natural gas).
• 15 psig low pressure steam.
• 150 – 300 psig high pressure steam.
• 30 and 125 psig hot water.
• Natural gas or light oil firing.
MODEL NUMBER, FUEL SERIES
NUMBER, HORSEPOWER, AND
DESIGN PRESSURE
The model designation for Cleaver-Brooks firetube boilers
includes the following:
• Light Oil: Series 100
• Natural Gas: Series 700
• Heavy Oil: Series 600
• Light Oil and Natural Gas: Series 200
• Heavy Oil and Natural Gas: Series 400
For example, a model CB700-350-150ST would represent a
model CB boiler, natural gas fired, 350 hp, 150 psig steam
design pressure.
All Cleaver-Brooks firetube boilers are built in accordance
with ASME Codes and, with the exception of the Ohio Special
Boilers and CBL Boilers, UL/ULC standards.
Insurance requirements (e.g., Industrial Risk Insurance IRI,
Factory Mutual FM, etc.) or special local code requirements
may dictate additional controls or equipment to be included.
Please contact your local Cleaver-Brooks authorized represen-
tative for assistance in completing your specification or for
additional information and optional equipment.
Refer to Table A1-1 for information on the standard product
offering for each firetube boiler model.

8. Table A1-1. Quick Comparison of Standard Features for Cleaver-Brooks FIretube Boilers
A Consult your local Cleaver-Brooks authorized representative for higher design pressures.
B Consult your local Cleaver-Brooks authorized representative for No. 4 & No. 5 oil applications.
C Ohio Special-Model CB 100 hp 4-pass dryback, 125-225 hp 2-pass dryback.
E Shell varies by square foot of pressure vessel and boiler horsepower.
F ICB Three-Pass Boiler utilizes multiblade 100-350 and Rotary 400-800.
MODEL
CB
15-800 HP
(SECTION A2)
CBLE
125-800 HP
(SECTION A3)
CBW
100-800 HP
(SECTION A4)
CB OHIO SPECIAL
100-225 HP
(SECTION A6)
CBE
60-350 HP
(SECTION A7)
CEW
125-800 HP
(SECTION A8)
CEW-LN
125-800 HP
(SECTION A9)
CEW OHIO
SPECIAL
100-225 HP
(SECTION A10)
CBL
800-1500 HP
(SECTION A11)
ICB
100-800 HP
(SECTION A12)
ICB-LN
100-800 HP
(SECTION A13)
Rated Capacity 15-800 hp 125-800 hp 100-800 hp 100-225 hp 60-350 hp 125-800 hp 125-800 hp 100-225 hp 800-1500 hp 100-800 hp 100-800 hp
Design
PressureA
Steam
15-300 psig
Steam
15-300 psig
Steam
15-250 psig
Steam Only
15-250 psig
Steam
15-300 psig
Steam
15-250 psig
Steam
15-250 psig
Steam
15-250 psig
Steam
150-250 psig
Steam
15-300 psig
Steam
15-300 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Hot Water
30 & 125 psig
Boiler Type 4-Pass Dry Back 4-Pass Dry Back 3-Pass Wet Back Passes VaryC 3-Pass Dry Back 3-Pass Wet Back 3-Pass Wet Back 3 Pass Wet Back 3 or 4-Pass Wet
Back
4-Pass Intercooled
3-Pass Option
4-Pass Intercooled
3-Pass Option
Shell Size 36" 15-40 hp
48" 50-100 hp
60" 125-200 hp
78" 250-350 hp
96" 400-800 hp
60" 125-200 hp
78" 250-350 hp
96" 400-800 hp
60" 100-200 hp
78" 250-400 hp
96" 500-800 hp
48" 100 hp
60"125-225 hp
48" 60-100 hp
60" 125-200 hp
78" 250-350 hp
60" 125-200 hp
78" 250-400 hp
96" 500-800 hp
60" 125-200 hp
78" 250-400 hp
96" 500-800 hp
60" 100-225 hp 114" or 126"E 55" 100-125 hp
60" 150-200 hp
72" 250-300 hp
78" 350-400 hp
92" 500-600 hp
106" 700-800 hp
55" 100-125 hp
60" 150-200 hp
72" 250-300 hp
78" 350-400 hp
92" 500-600 hp
106" 700-800 hp
Fuel 15-800 hp
No. 2 Oil, Gas,
Combination
Oil/Gas
No. 2 Oil,
Gas,
Combination
Oil/Gas
No. 2 Oil,
Gas,
Combination
Oil/Gas
100-225 hp
No. 2 Oil,
Gas,
Combination
Oil/Gas
No. 2 Oil,
Gas,
Combination
Oil/Gas
No. 2 Oil,
Gas,
Combination
Oil/Gas
No. 2 Oil,
Gas,
Combination
Oil/Gas
No. 2 Oil,
Gas,
Combination
Oil/Gas
800-1300 hp
No. 2 Oil, Gas,
Combination
Oil/Gas
No. 2 Oil,
Natural Gas
Combination Oil/
Gas
No. 2 Oil,
Natural Gas
Combination Oil/
Gas
50-800 hp
No. 6 OilB,
Gas,
Combination
Oil/Gas
No. 6 OilB,
Gas,
Combination
Oil/Gas
100 hp
No. 6 Oil,
Gas,
Combination
Oil/Gas
800-1500 hp
Gas
800-1000 hp
No. 6 Oil, Gas,
Combination
Oil/Gas
Firing Method 15-20 hp
On-off
Full Modulation Full Modulation Full Modulation Full Modulation Full Modulation Full Modulation Full Modulation Full Modulation Full Modulation Full Modulation
30-40 hp
Low-High-Low-Off
50-800 hp
Full Modulation
Air Damper Type Single Blade
15-40 hp
Rotary 50-800 hp
Rotary Rotary Rotary Multi-Blade Multi-Blade
125-350 hp,
Rotary 400-800 hp
Rotary Multi-Blade Rotary & Louvers Multiblade
100-250 hp
Rotary 300-800 hpF
Rotary
Paint Color Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue Blue
Approvals UL & ULC
Boiler/Burner
UL & ULC
Boiler/Burner
UL & ULC
Boiler/Burner
N/A UL & cUL
Boiler/Burner
UL & cUL Boiler/
Burner
UL & cUL
Boiler/Burner
N/A 800-1000 hp UL &
CSA
(Burner Only)
UL & cUL
Boiler/Burner
UL & cUL
Boiler/Burner
Steam Trim-Low
Water Control
McD&M 157 McD&M 157 McD&M 157 McD&M 157 McD&M 157 McD&M 157 McD&M 157 McD&M 157 McD&M 193-7 McD&M 157,
McD&M 193
McD&M 157,
McD&M 193
Steam Trim Aux
Low Water Control
Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2 Warrick 3C-2
Water Trim-Low
Water Control
McD&M
PS 750-MT-120
McD&M
PS 750-MT-120
McD&M
PS 750-MT-120
N/A McD&M
PS 750-MT-120
McD&M
PS 750-MT-120
McD&M
PS 750-MT-120
N/A N/A McD&M
PS 750-MT-120
McD&M
PS 750-MT-120
12-02

9. Table A1-1. Quick Comparison of Standard Features for Cleaver-Brooks FIretube Boilers (Continued)
MODEL
CB
15-800 HP
(SECTION A2)
CBLE
125-800 HP
(SECTION A3)
CBW
100-800 HP
(SECTION A4)
CB OHIO SPECIAL
100-225 HP
(SECTION A6)
CBE
60-350 HP
(SECTION A7)
CEW
125-800 HP
(SECTION A8)
CEW-LN
125-800 HP
(SECTION A9)
CEW OHIO
SPECIAL
100-225 HP
(SECTION A10)
CBL
800-1500 HP
(SECTION A11)
ICB
100-800 HP
(SECTION A12)
ICB-LN
100-800 HP
(SECTION A13)
Controls
Steam & Hot
Water Controls
Hi Limit (MR),
Oper. Limit,
Firing Rate
30-800 hp
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper.Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Hi Limit (MR),
Oper. Limit,
Firing Rate
Surface Blowoff
Conn. & Dip
Tube on top C/L
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
HPS-Std HPS-Std
LPS-Conn. Only
HPS-Std
LPS-Conn. Only
Air Vent
Connection
HW-Std. HW-Std. HW-Std. N/A HW-Std. HW-Std. HW-Std. N/A N/A HW-Std HW-Std
Stack
Thermometer
Yes Yes Yes Yes No No No No Yes No No
Drain Valve-HW &
15 psig-Steam
No No No No No No No No N/A No No
Front Door Hinge 15-200 hp
Davit/Hinge
250-800 hp
Hinge 125-200 hp
Davit /Hinge
250-800 hp
Hinge 100-200 hp
Davit/Hinge
250-800 hp
Hinge Davit Davit Davit Davit Davit Davit Davit
Rear Door Hinge 15-100 hp
Davit 125-800 hp
Davit Davit Hinge 100 hp
Davit 125-225 hp
Davit Davit Davit Davit Davit Davit Davit
Insulation 2 inch 2 inch 2 inch 2 inch 2 inch 2 Inch 2 Inch 2 Inch 2 Inch 2 inch 2 inch
Standard
Voltage
Requirements
3 Phase 3 Phase 3 Phase 3 Phase 60-80 hp-
1 Phase
100-350 hp-
3 Phase
3 Phase 3 Phase 3 Phase 3 Phase 3 Phase 3 Phase
Fuse Protection Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit &
All 3 Phase Loads
Except Remote
Oil Pump
Control Circuit
Transformer
Yes Yes Yes Yes Yes-3 Phase Only Yes Yes Yes Yes Yes Yes
Flame Safeguard
Control
Cleaver-Brooks
CB780
Cleaver-Brooks
CB780
Cleaver-Brooks
CB780
Cleaver-Brooks
CB780
Cleaver-Brooks
CB110
Cleaver-Brooks
CB110
Cleaver-Brooks
CB110
Cleaver-Brooks
CB110
Cleaver-Brooks
CB110
Cleaver-Brooks
CB110
Cleaver-Brooks
CB110
Scanner Type Infrared Infrared Infrared Infrared Ultraviolet Ultraviolet Ultraviolet Ultraviolet Ultraviolet
(Gas & No. 2 Oil)
Infrared (No. 6 Oil)
Ultraviolet Ultraviolet
Control Panel
Location
Front Head with
Key Lock
Front Head with
Key Lock
Front Head with
Key Lock
Front Head with
Key Lock
Burner without
Key Lock
Burner without
Key Lock
Burner without
Key Lock
Burner without
Key Lock
Burner without
Key Lock
On Burner
without Key Lock
Remote-Right Side
without
Key Lock
Indicating Lights 50-800 hp
LD, FV, LW, FF
LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF LD, FV, LW, FF
Type of Pilot Interrupted Gas
Pilot-Gas,
No. 6 Oil & All
Combination
15-800 hp
Interrupted Gas
Pilot-Gas & All
Combination
Interrupted Gas
Pilot-Gas,
No. 6 Oil & All
Combination
Interrupted Gas
Pilot-Gas, No. 6 Oil
& All
Combination
Interrupted Gas
Pilot-Gas & All
Combination
Interrupted Gas
Pilot-Gas, No. 2 Oil
& All Combination
Interrupted Gas
Pilot-Gas, No. 2 Oil
&
All Combination
Interrupted Gas
Pilot-Gas, No. 2 Oil
&
All Combination
Interrupted Gas
Pilot-Gas, No. 2 Oil,
No. 6 Oil
&
All Combination
Interrupted Gas
Pilot-Gas, No. 2 Oil
All Combination
Interrupted Gas
Pilot-Gas, No. 2 Oil
All Combination
Direct Spark
Ignition-No. 2 Oil
15-40 hp
Spark Ignited Oil
Pilot No. 2 Oil
Spark Ignited Oil
Pilot No. 2 Oil
Spark Ignited Oil
Pilot No. 2 Oil
No. 2 Oil
Direct Spark
Ignition
60-100 hp
Gas Pilot
125-350 hp
Spark Ignited Oil
Pilot-No. 2 Oil
50-800 hp
12-02

10. D Altitude, size, and fuel series limitations may apply.
MODEL
CB
15-800 HP
(SECTION A2)
CBLE
125-800 HP
(SECTION A3)
CBW
100-800 HP
(SECTION A4)
CB OHIO SPECIAL
100-225 HP
(SECTION A6)
CBE
60-350 HP
(SECTION A7)
CEW
125-800 HP
(SECTION A8)
CEW-LN
125-800 HP
(SECTION A9)
CEW OHIO
SPECIAL
100-225 HP
(SECTION A10)
CBL
800-1500 HP
(SECTION A11)
ICB
100-800 HP
(SECTION A12)
ICB-LN
100-800 HP
(SECTION A13)
Gas Burner Type High Radiant
Multi-Port-
All Except
125-200 hp-
Annular Entry
High Radiant
Multi-Port-
All Except
125-200 hp-
Annular Entry
High Radiant
Multi-Port-
All Except
125-200 hp-
Annular Entry
High Radiant
Multi-Port 100 hp
Annular 125-225 hp
High Radiant
Multi-Port
High Radiant
Multi-Port
High Radiant
Multi-Port
High Radiant
Multi-Port
High Radiant
Multi-Port
High Radiant
Multi-Port
High Radiant
Multi-Port
Main Gas Valve Motorized Motorized Motorized Motorized Solenoid, Motorized Solenoid, Motorized Solenoid, Motorized Solenoid, Motorized Motorized Solenoid, Motorized Solenoid, Motorized
Main Gas
Control System
Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve Butterfly Valve
Gas Pressure
Regulator
Required, Not
Included
Required, Not
Included
Required, Not
Included
Required, Not
Included
Included Included Included Included Included Included Included
Gas Pilot
Regulator
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
High & Low Gas
Pressure
Switches
No-15-50 hp
Yes-60-800 hp
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Oil Burner Type Air Atomizing Air Atomizing Air Atomizing Air Atomizing Pressure Atomizing
60-200 hp
Air Atomizing
250-350 hp
Air Compressor-
Shipped Loose
Pressure Atomizing
125-200 hp
Air Atomizing
250-800 hp
Air Compressor -
Shipped loose
Air Atomizing
Air Compressor
125-300 hp-
Mounted
350-800 hp-
Shipped Loose
Air Atomizing Air Atomizing Pressure
Atomizing
100-150 hp
Air Atomizing
200-800 hp
Air Atomizing
Main Oil Valves Solenoid Solenoid Solenoid Solenoid Solenoid Solenoid Solenoid Solenoid Motorized Solenoid Solenoid
Oil Control
System
Metering Valve Metering Valve Metering Valve Metering Valve Metering System Metering System Metering System Metering System Metering System Metering System Metering System
Oil Pump Included Included Included Included Included Included Included Included Included Included Included
Location of Oil
Pump
No. 2 Oil 15-40 hp
on Front Head;
50-800 hp Remote
No. 2 Oil
125-800 hp
Remote
No. 2 Oil
100-800 hp Remote
No. 2 Oil
100-225 hp
Remote
No. 2 Oil 60-200 hp
Burner Mounted
No. 2 Oil
250-350 hp
Remote
No. 2 Oil
125-200 hp
Burner Mounted
No. 2 Oil
250-800 hp
Remote
No. 2 Oil
125-800 hp
Remote
No. 2 Oil
100-225 hp
Remote
No. 2 Oil
Remote
No. 2 Oil
100-150 hp
Burner Mounted
No. 2 Oil
200-800 hp
Remote
No. 2 Oil
100-800 hp
Remote
No. 6 Oil
50-800 hp, Remote
No. 6 Oil
100-800 hp Remote
No. 6 Oil
100-225 hp
Remote
No. 6 Oil Mounted
on Oil Pump/Oil
Heater Skid
NOx Control No-Use CBLE Induced FGRD
(LE Option)
125-800 hp
20-60 ppm
(Natural Gas)
No-Use CEW-LN N/A N/A No-Use CEW-LN Induced FGR
30 ppm(Natural
Gas)
N/A Optional-Induced
FGR 30 ppm
(Natural Gas) up to
1300 hp.
No-Use ICB-LN Induced FGR
30 ppm
(Natural Gas)
Maximum Stack
Pressure
Variation
15-40 hp
+ or-0.25" W.C.
+ or-0.25" W.C. + or-0.50" W.C. + or-0.25" W.C. + or-0.25" W.C. + or-0.25" W.C. + or-0.25" W.C. + or-0.25" W.C. + or-0.50" W.C. + or-0.25" W.C. + or-0.25" W.C.
50-800 hp
+ or-0.50" W.C.
+ or-0.25" W.C.
With FGR
Start-Up Included Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Table A1-1. Quick Comparison of Standard Features for Cleaver-Brooks FIretube Boilers (Continued)
12-02

11. A1-8
GGGGeeeennnneeeerrrraaaallll FFFFiiiirrrreeeettttuuuubbbbeeee BBBBooooiiiilllleeeerrrrssss
12-02
Notes

12. A2-1
07-02
CONTENTS
FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-3
PRODUCT OFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-3
DIMENSIONS AND RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-4
PERFORMANCE DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-21
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-21
Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-21
ENGINEERING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-24
Blowdown Water Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-24
Sound Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-27
Gas-Fired Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-30
Gas Pressure Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-31
Oil-Fired Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-36
No. 6 Oil Piping, Storage Tank Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-36
Boiler Room Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-44
Stack Support Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-44
Stack/Breeching Size Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-44
Boiler Room Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-44
SAMPLE SPECIFICATION (MODEL CB BOILER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-47
ILLUSTRATIONS
Figure A2-1. Model CB Steam Boiler Dimensions and Weights (15 and 150 psig Design Pressure -
15 to 100 hp) Sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-10
Figure A2-2. Model CB Steam Boiler Dimensions and Weights (15 and 150 psig Design Pressure -
125 to 800 hp) Sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-12
Figure A2-3. Model CB Hot Water Boiler Dimensions (30 psig and 125 psig Design Pressure -
15 to 100 hp) - Sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-14
Figure A2-4. Model CB Hot Water Boiler Dimensions (30 psig and 125 psig Design Pressure -
15 to 100 hp) - Sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-16
Figure A2-5. Space Required to Open Rear Head on Model CB Boilers Equipped with Davits . . . . . . . . . . . . . . . . . . . A2-18
Figure A2-6. Lifting Lug Location, Model CB Boilers - Sheet 1 of 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-18
Figure A2-7. Model CB Boiler Mounting Piers 20
Figure A2-8. Predicted Stack Temperature Increase for Pressure Greater Than 125 psig . . . . . . . . . . . . . . . . . . . . . . . . A2-23
Figure A2-9. Standard Gas Train Connection Size and Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-34
Section A2
MODEL CB BOILERS

13. A2-2
Model CB Boilers Firetube Boilers
07-02
Figure A2-10. Typical Gas Piping Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-35
Figure A2-11. Model CB Gas Train Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-36
Figure A2-12. No. 2 Oil Connection Size, Location and Recommended Line Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-37
Figure A2-13. No. 6 Oil Connection Size, Location and Recommended Line Sizes, Model CB Boiler . . . . . . . . . . . . . . A2-37
Figure A2-14. No. 2 Oil Piping, Single Boiler Installation, Remote Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-38
Figure A2-15. No.2 Oil Piping, Single Boiler Installation Oil Pump Integral with Boiler . . . . . . . . . . . . . . . . . . . . . . . . A2-38
Figure A2-16. No. 2 Oil Piping, Multiple Boiler Installation, Remote Oil Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-39
Figure A2-17. No. 2 Oil Piping, Multiple Boiler Installation, Oil Pump Integral with Boiler . . . . . . . . . . . . . . . . . . . . . A2-39
Figure A2-18. No. 2 Oil Piping, Multiple Boiler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-40
Figure A2-19. No. 6 Oil Piping, Single Boiler Installation, Remote Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-40
Figure A2-20. No. 6 Oil Piping, Multiple Boiler Installation, Remote Oil Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-41
Figure A2-21. No. 6 Oil Piping, Multiple Boiler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-41
Figure A2-22. No. 2 Oil Transfer Tank Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-42
Figure A2-23. Typical Fuel Storage Tank Arrangement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-42
Figure A2-24. Typical Cross Section of Bundled Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-43
Figure A2-25. Schematic of Standard Alstrom Hot Water Safety-Type Preheating System . . . . . . . . . . . . . . . . . . . . . . . A2-43
Figure A2-26. Boiler Room Length (Typical Layout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-45
Figure A2-27. Boiler Room Width (Typical Layout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-45
Figure A2-28. Breeching Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-46
TABLES
Table A2-1. Model CB Steam Boiler Ratings (15 - 100 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-5
Table A2-2. Model CB Steam Boiler Ratings (125 - 800 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-5
Table A2-3. Model CB Hot Water Boiler Ratings (15 - 100 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-6
Table A2-4. Model CB Hot Water Boiler Ratings (125 - 800 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-6
Table A2-5. Steam Boiler Safety Valve Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-7
Table A2-6. Hot Water Boiler Relief Valve Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-8
Table A2-7. Predicted Fuel-to-Steam Efficiencies (%), Model CB Boilers - 10 psig, Natural Gas . . . . . . . . . . . . . . . . . A2-22
Table A2-8. Predicted Fuel-to-Steam Efficiencies (%), Model CB Boilers - 125 psig, Natural Gas . . . . . . . . . . . . . . . . A2-22
Table A2-9. Predicted Fuel-to-Steam Efficiencies (%), Model CB Boilers - 10 psig, No. 6 Oil . . . . . . . . . . . . . . . . . . . A2-22
Table A2-10. Predicted Fuel-to-Steam Efficiencies (%), Model CB Boilers - 125 psig, No 6 Oil . . . . . . . . . . . . . . . . . . A2-22
Table A2-11. Predicted Fuel-to-Steam Efficiencies (%), Model CB Boilers - 10 psig, No. 2 Oil . . . . . . . . . . . . . . . . . . A2-23
Table A2-12. Predicted Fuel-to-Steam Efficiencies (%), Model CB Boilers - 125 psig, No. 2 Oil . . . . . . . . . . . . . . . . . A2-23
Table A2-13. Model CB Boiler Emission Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-24
Table A2-14. Heating Surface, Model CB Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-24
Table A2-15. Steam Volume and Disengaging Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-25
Table A2-16. Water Circulation Rate and Temperature Drop for Hot Water Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-25
Table A2-17. Recommended Steam Nozzle Size (To Maintain 4000 to 5000 fpm Nozzle Velocity) . . . . . . . . . . . . . . . A2-26
Table A2-18. Recommended Non-Return Valve Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-26
Table A2-19. Model CB Blowdown Tank Sizing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-27
Table A2-20. Sound Pressure Level Summary (50 - 800 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-27
Table A2-21. Model CB Boiler Sound Pressure Level Details (40 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-27
Table A2-22. Model CB Boiler Sound Pressure Level Details (50 - 125 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-28
Table A2-23. Model CB Boiler Sound Pressure Level Details (125 - 200 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-29
Table A2-24. Model CB Boiler Sound Pressure Level Details (250 - 350 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-29
Table A2-25. Model CB Boiler Sound Pressure Level Details (400 - 800 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-30
Table A2-26. Minimum Required Gas Pressure at Entrance to Standard and FM Gas Trains
(Downstream of Gas Pressure Regulator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-31
Table A2-27. Minimum Gas Pressure at Entrance to Gas Trains Equipped with Industrial Risk Insurers
(IRI) Requirements (Downstream of Gas Pressure Regulator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-31
Table A2-28. Under and Oversized Standard and FM Gas Trains, Model CB Boilers (50 - 800 hp) . . . . . . . . . . . . . . . . A2-32
Table A2-29. Under and Oversized IRI Gas Trains, Model CB Boilers (50 - 800 hp) . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-33
Table A2-30. Minimum Required Gas Pressure Altitude Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2-33
Table A2-31. Maximum Gas Consumption (CFH) for Natural Gas and Propane Vapor & Gas Pilot Data. . . . . . . . . . . . A2-34

14. A2-3
Firetube Boilers Model CB Boilers
07-02
FEATURES AND BENEFITS
In addition to the features provided on all Cleaver-Brooks
Firetube Boilers, the following features apply specifically to
Model CB Firetube Boilers. The CB four-pass dryback boiler
is the premium firetube boiler design available.
Four-Pass Dryback Design:
• Four-pass design provides high flue gas velocities and low
stack temperature for guaranteed maximum efficiency.
• Dryback design provides full access to boiler tubes, tube
sheet, and furnace for ease of maintenance.
• Dryback design includes single rear tube sheet construction,
providing reduced tube sheet stresses.
Five Square Feet of Heating Surface per Boiler hp:
• Maximum heat transfer with minimum thermal stresses
provide guaranteed efficiency and long boiler life.
• Highest guaranteed fuel-to-steam efficiencies.
Low Furnace Location
• Furnace located well below water level with generous
clearance from bottom of boiler, allowing proper circulation.
• Low furnace provides additional safety margin between
furnace and water level.
• Reduces water carryover, producing drier steam.
Hinged or Davited Front and Rear Doors:
• Provides full access to front and rear tube sheet and furnace.
• Reduces maintenance costs.
High Turndown Burner:
• 4:1 turndown (gas and oil) is standard on boilers up to 250
hp.
• Guaranteed 10:1 turndown (gas fired) 8:1 (No. 2 oil fired)
standard on 250 hp through 800 hp.
• Advanced burner design provides maximum combustion
efficiencies and high turndown.
• Reduced boiler cycling and maintenance.
• Boiler stays on line during low load conditions for optimum
efficiency and performance.
Gas, No. 2 Oil, No. 6 Oil, and Combination Gas and Oil
Burners Available:
• High radiant multi-port gas burner designed for high gas
velocities and complete fuel/air mixing, providing
maximum combustion efficiencies.
• Air atomizing oil burner available for proper oil atomization,
maximum combustion efficiency, and low maintenance
requirements.
• Air atomizing compressor provided with the boiler package
for clean oil burning and ease of maintenance.
• Combination gas/oil burners provide quick fuel changeover
without re-adjustment of the burner.
• Fuel oil controller eliminates the need for over 40
connections, combining gauges, valves, and regulators into a
single casting.
• Retractable oil nozzle provides easy access and cleaning and
eliminates coking of oil and nozzle tip when firing gas.
Low NOx Capability Available:
• 20 ppm NOx guarantee available on Model CB (LE) Boilers.
PRODUCT OFFERING
Model CB Firetube Boilers are available in low pressure
steam, high pressure steam, and hot water designs. Burners are
available to fire natural gas, light oil, heavy oil, or a combina-
tion of oil and gas. Optional alternate fuel burners are also
available.
Model CB Boilers include:
• Four-pass dryback design.
• 15 hp through 800 hp.
• 150 psig - 350 psig high pressure steam.
• 15 psig low pressure steam.
• 30 psig or 125 psig hot water.
• Natural gas, light oil, or heavy oil firing.
The Model CBBoiler is the premium firetube product offering
providing maximum boiler efficiency, the widest range of size
and pressures, and premium control packages.
Available options: For option details, contact your Cleaver-
Brooks authorized representative. Options include the
following:
Boiler Options
• Auxiliary low water cut-off (standard on steam boilers).
• Drain valves.
• Additional screwed or flanged tappings.
• Special design pressures.
• Surge load baffles.
• Seismic design.

15. A2-4
Model CB Boilers Firetube Boilers
07-02
• Internal hot water coils.
• Blowdown valves.
• Non-return valves.
• Feedwater valves and regulators.
• Special doors, davited, hinged, left swing.
• Special base rails.
• Surface blowdown systems.
• Combustion relief door.
• Weather-proofing.
• Blend pump.
Burner/Control Options
• Special modulation controls.
• Low NOx equipment.
• Optional flame safeguard controller.
• Lead/lag system.
• High altitude design, up to 12,000 ft.
• Special insurance and code requirements (e.g., IRI, FM,
ASME CSD-1).
• Alarm bell/silence switch.
• Special motor requirements (TEFC, high efficiency).
• Remote contacts.
• Special purpose indicator lights.
• Main disconnect.
• Elapsed time meter.
• Voltmeter/micro-ammeter.
• NEMA enclosures.
• Low fire hold controls.
• Remote emergency shut-off (115V).
• Circuit breaker.
• Day/night controls.
• Special power requirements.
Fuel Options
• Automatic fuel changeover.
• Special gas pressure regulator.
• Oversized/undersized gas trains.
• Gas strainer.
• Special fuel shut-off valves.
• Special pilot.
• Alternate fuel firing (propane, digester gas, etc.).
• Special oil pumps.
DIMENSIONS AND RATINGS
Dimensions and ratings for the Model CB boilers are shown in
the following tables and illustrations:
• TableA2-1. Model CB Steam Boiler Ratings (15 thru 100 hp)
• Table A2-2. Model CB Steam Boiler Ratings (125 thru 800
hp)
• TableA2-3. Model CB HotWater Boiler Ratings (15 thru 100
hp)
• Table A2-4. Model CB Hot Water Boiler Ratings (125 thru
800 hp)
• Table A2-5. Safety Valve Openings
• Table A2-6. Relief Valve Openings
• Figure A2-1. Model CB Steam Boiler Dimensions (15 and
150 lb design pressure) (15 thru 100 hp)
• Figure A2-2. Model CB Steam Boiler Dimensions (15 and
150 lb design pressure) (125 thru 800 hp)
• Figure A2-3. Model CB Hot Water Boiler Dimensions (30 lb
design pressure) (15 thru 100 hp)
• Figure A2-4. Model CB Hot Water Boiler Dimensions (20 lb
design pressure) (125-800 hp)
• Figure A2-5. Space Required to Open Rear Head on Model
CB Boilers Equipped with Davits
• Figure A2-6. Lifting Lug Locations, Model CB Boilers
• Figure A2-7. Model CB Boiler Mounting Piers

16. A2-5
Firetube Boilers Model CB Boilers
07-02
BOILER HP 15C
20C
30C
40C 50 60 70 80 100
RATINGS - SEA LEVEL TO 3000 FT
Rated Cap. (lbs steam/hr @212°F)
Btu Output (1000 Btu/hr)
518
502
690
670
1035
1004
1380
1339
1725
1674
2070
2009
2415
2343
2760
2678
3450
3348
APPROXIMATE FUEL CONSUMPTION AT RATED CAPACITY
Light Oil (gph)A 4.5 6.0 9.0 12.0 15.0 18.0 21.0 24.0 30.0
Heavy Oil (gph)B - - - - 14.0 16.5 19.5 22.5 28.0
Gas (cfh) 1000 Btu-Nat
Gas (Therm/hr)
625
6.3
835
8.4
1255
12.6
1675
16.8
2095
21.0
2510
25.1
2930
29.3
3350
33.5
4185
41.9
POWER REQUIREMENTS - SEA LEVEL TO 3000 FT, 60 HZ
Blower Motor hp (except gas) 1 1 1-1/2 2 2 2 2 2D 3
Gas Models (only) 1 1 1-1/2 2 2 2 2 2D 3
Oil Pump Motor, hp No. 2 Oil Belt-Driven From Blower 1/3 1/3 1/3 1/3 1/3
Oil Pump Motor, hp No. 6 Oil - - - - 1/3 1/3 1/3 1/3 1/3
Oil Heater kW No. 6 Oil - - - - 5 5 5 5 5
Air Compressor Motor hp
(Oil firing Only)
Air Compressor Belt-Driven
from Blower Motor
2 2 2 2 2
NOTES:
1. For altitudes above 3000 ft, contact your local Cleaver-Brooks authorized representative for verification of blower motor hp.
A. Based on 140,000 Btu/gal.
B. Based on 150,000 Btu/gal.
C. No. 6 Oil not available in 15-40 hp range.
D. 3 hp above 2000 ft.
Table A2-1. Model CB Steam Boiler Ratings (15 - 100 hp)
Table A2-2. Model CB Steam Boiler Ratings (125 - 800 hp)
BOILER HP 125 150 200 250 300 350 400 500 600 700 750 800
RATINGS SEA LEVEL TO 3000 FT J
Rated Cap. (lbs steam/hr @ 212°F)
Btu Output (1000 Btu/hr)
4313
4184
5175
5021
6900
6695
8625
8369
10350
10043
12075
11716
13800
13390
17250
16738
20700
20085
24150
23432
25875
25106
27600
26779
APPROXIMATE FUEL CONSUMPTION AT RATED CAPACITY
Light Oil (gph)A 37.5 45.0 60.0 74.5 89.5 104.5 119.5 149.5 179.5 209.0 224.2 239.3
Heavy Oil (gph)B 35.0 42.0 56.0 69.5 83.5 97.5 111.5 139.5 167.5 195.5 209.2 223.4
Gas (cfh)
MBTU-nat
Gas
(Therm/hr)
5230
52.3
6280
62.8
8370
83.7
10460
104.6
12555
125.5
14650
146.5
16750
167.5
20925
209.3
25100
251.0
29300
293.0
31385
313.8
33480
334.8
POWER REQUIREMENTS - SEA LEVEL TO 3000 FT, 60 HZ
Blower Motor hp (except gas) 5 7-1/2 15 7-1/2 10C
15D
10C
15E
20F
30G
40L
50H
Gas Models (only) 5 5 10 7-1/2 7-1/2I 15 10C
15E
20F
30G
40L
50H
Oil Pump Motor, hp No. 2 Oil 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 1 1 1
Oil Pump Motor, hp No. 6 Oil 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 3/4 3/4
Oil Heater kW No. 6 Oil 5 5 5 7-1/2 7-1/2 7-1/2 7-1/2 7-1/2K
7-1/2K
7-1/2K
7-1/2K
7-1/2K
Air Compressor Motor hp
(Oil firing Only)
Air Compressor Belt-Driven
From Blower Motor 7-1/2 7-1/2 7-1/2 7-1/2 7-1/2 7-1/2
NOTES:
1. For altitudes above 3000 ft, contact your local Cleaver-Brooks autho-
rized representative for verification of blower motor hp.
A. Based on 140,000 Btu/gal.
B. Based on 150,000 Btu/gal.
C.15 hp above 2500 ft.
D. 20 hp above 2500 ft.
E. 20 hp above 2000 ft.
F. 30 hp above 2500 ft.
G. 40 hp above 2000 ft.
H. 60 hp above 3000 ft.
I. 10 hp above 2500 ft.
J. Sea level to 2,500 ft for 300 and 350 Hp sizes.
K. 10 kW on low pressure.
L. 50 hp above 2500 ft.

17. A2-6
Model CB Boilers Firetube Boilers
07-02
BOILER HP 15c
20c
30c
40c 50 60 70 80 100A 100 125A
RATINGS - SEA LEVEL TO 3000 FT
Rated Cap Btu Output (1000 Btu/hr) 502 670 1004 1339 1674 2009 2343 2678 3348 3348 4184
APPROXIMATE FUEL CONSUMPTION AT RATED CAPCITY
Light Oil (gph)A 4.5 6.0 9.0 12.0 15.0 18.0 21.0 24.0 30.0 30.0 37.5
Heavy Oil (gph)B - - - - 14.0 16.5 19.5 22.5 28.0 28.0 35.0
Gas (cfh)
MBtu- nat
Gas (Therm/hr)
625
6.3
835
8.4
1255
12.6
1675
16.8
2095
21.0
2510
25.1
2930
29.3
3350
33.5
4185
41.9
4185
41.9
5230
52.3
POWER REQUIREMENTS - SEA LEVEL TO 3000 FT, 60 HZ
Blower Motor hp (except gas) 1 1 1-1/2 2 2 2 2 2D 3 3 3
Gas Models (only) 1 1 1-1/2 2 2 2 2 2D 3 3 3
Oil Pump Motor, hp No. 2 Oil Belt-Driven From Blower 1/3 1/3 1/3 1/3 1/3 1/3 1/2
Oil Pump Motor, hp No. 6 Oil - - - - 1/3 1/3 1/3 1/3 1/3 1/3 1/2
Oil Heater kW No. 6 Oil - - - - 5 5 5 5 5 5 5
Air Compressor Motor hp
(Oil firing Only)
Air Compressor Belt-Driven
from Blower Motor
2 2 2 2 2 2 2
NOTES:
1. For altitudes above 3000 ft, contact your local Cleaver-Brooks authorized representative for verification of blower motor hp.
A. Based on 140,000 Btu/gal.
B. Based on 150,000 Btu/gal.
C. No. 6 Oil not available in 15-40 hp range.
D. 3 hp above 2000 ft.
Table A2-3. Model CB Hot Water Boiler Ratings (15 - 100 hp)
Table A2-4. Model CB Hot Water Boiler Ratings (125 - 800 hp)
BOILER HP 150 175A 200 250 300 350 400 500 600 700 750 800
RATINGS - SEA LEVEL TO 3000 FT J
Rated Cap. Btu Output
(1000 Btu/hr)
5021 5858 6695 8369 10043 11716 13390 16738 20085 23432 25106 26779
APPROXIMATE FUEL CONSUMPTON AT RATED CAPCITY
Light Oil (gph)A 45.0 52.5 60.0 74.5 89.5 104.5 119.5 149.5 179.5 209.0 224.2 239.3
Heavy Oil (gph)B 42.0 49.0 56.0 69.5 83.5 97.5 111.5 139.5 167.5 195.5 209.3 223.4
Gas (cfh)
MBtu-Natural Gas
(Therm/hr)
6280
62.8
7320
73.2
8370
83.7
10460
104.6
12555
125.5
14650
146.5
16750
167.5
20925
209.3
25100
251.0
29300
293.0
31385
313.8
33480
334.8
POWER REQUIREMENTS - SEA LEVEL TO 3000 FT, 60 HZ
Blower Motor hp
(except gas) 7-1/2 7-1/2 15 7-1/2 10C
15D
10C
15E
20F
30G
40K
50H
Gas Models (only) 5 5 10 7-1/2 7-1/2I 15 10C
15E
20F
30G
40K
50H
Oil Pump Motor, hp No. 2 Oil 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 1 1 1
Oil Pump Motor, hp No. 6 Oil 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 3/4 3/4
Oil Heater kW No. 6 Oil 5 5 5 7-1/2 7-1/2 7-1/2 10 10 10 10 10 10
Air Compressor Motor hp (Oil
firing Only) 7-1/2 7-1/2 7-1/2 7-1/2 7-1/2 7-1/2
NOTES:
1. For altitudes above 3000 ft, contact your local Cleaver-Brooks au-
thorized representative for verification of blower motor hp.
A. Based on 140,000 Btu/gal.
B. Based on 150,000 Btu/gal.
C. 15 hp above 2500 ft.
D. 20 hp above 2500 ft.
E. 20 hp above 2000 ft.
F. 30 hp above 2500 ft.
G. 40 hp above 2000 ft.
H. 60 hp above 3000 ft.
I. 10 hp above 2500 ft.
J. Sea level to 2,500 ft for 300 and 350 hp sizes.
K. 50 hp above 2500 ft.

18. A2-7
Firetube Boilers Model CB Boilers
07-02
VALVE
SETTING
15 PSIG STEAM 100 PSIG STEAM 125 PSIG STEAM 150 PSIG STEAM 200 PSIG STEAM 250 PSIG STEAM
BOILER
HP
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
15 1 1-1/2 1 1 1 3/4 1 3/4 1 3/4 1 3/4
20 1 1-1/2 1 1 1 1 1 3/4 1 3/4 1 3/4
25 1 2 1 1 1 1 1 1 1 3/4 1 3/4
30 1 2 1 1-1/4 1 1 1 1 1 3/4 1 3/4
40 1 2-1/2 1 1-1/4 1 1-1/4 1 1 1 1 1 1
50 1 2-1/2 1 1-1/2 1 1-1/2 1 1-1/4 1 1 1 1
60 1 2 1 1-1/2 1 1-1/2 1 1-1/4 1 1-1/4 1 1
70 1 2 1 2 1 1-1/2 1 1-1/4 1 1-1/4 1 1-1/4
80 1 2-1/2 1 2 1 1-1/2 1 1-1/2 1 1-1/4 1 1-1/4
100 1 2-1/2 1 2 1 2 1 1-1/2 1 1-1/2 1 1-1/4
125 1 3 2 1-1/2 2
(1) 1-1/2
(1) 1-1/4
2
(1) 1-1/2
(1) 1-1/4
2
(1) 1-1/4
(1) 1
2 1
150 1 3 2
(1) 2
(1) 1-1/2
2 1-1/2 2
(1) 1-1/2
(1) 1-1/4
2 1-1/4 2
(1) 1
(1) 1-1/4
200 2 2-1/2 2 2 2 (2) 1-1/2 2 2) 1-1/2 2
(1) 1-1/2
(1) 1-1/4
2 (2) 1-1/4
250 2
(1) 2-1/2
(1) 3
2
(1) 2-1/2
(1) 2
2 2 2
(1) 2
(1) 1-1/2
2 1-1/2 2
(1) 1-1/2
(1) 1-1/4
300 2 3 2 2-1/2 2
(1) 2-1/2
(1) 2
2 2 2
(1) 2
(1) 1-1/2
2 1-1/2
350 3
(1) 2
(2) 3
3
(1) 2-1/2
(2) 2
2 2-1/2 2
(1) 2-1/2
(1) 2
2 2 2
(1) 1-1/2
(1)2
400 3
(2) 3
(1) 2-1/2
3
(1) 2
(2) 2-1/2
2 2-1/2 2
(1) 2-1/2
(1) 2
2 2 2
(1) 2
(1) 1-1/2
500 3 3 3 2-1/2 3
(2) 2-1/2
(1) 2
2 2-1/2 2
(1) 2-1/2
(1) 2
2 2
600 4
(1) 2-1/2
(3) 3
4
(3) 2-1/2
(1) 2
3 2-1/2 3
2-1/2
(1) 2
2 2-1/2 2
(1) 2
(1) 2-1/2
700 5
(3) 3
(2)2-1/2
5
(3) 2-1/2
(2) 2
4
(3) 2-1/2
(1) 2
3
(2) 2-1/2
(1) 2
2 2-1/2 2 2-1/2
750 5
(3) 3
(2)2-1/2
5
(3) 2-1/2
(2) 2
4
(3) 2-1/2
(1) 2
3
(2) 2-1/2
(1) 2 2 2-1/2 2 2-1/2
800 5
(3) 3
(2)2-1/2
5
(3) 2-1/2
(2) 2
4
(3) 2-1/2
(1) 2
3
(2) 2-1/2
(1)2
2 2-1/2 2 2-1/2
NOTE: Valve manufacturers are Kunkle, Consolidated or Conbraco, depending on availability.
Table A2-5. Steam Boiler Safety Valve Openings

19. A2-8
Model CB Boilers Firetube Boilers
07-02
VALVE
SETTING
30 PSIG HW 60 PSIG HW 100 PSIG HW 125 PSIG HW
BOILER
HP
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
NO. OF
VALVES
REQ'D
OUTLET
SIZE
(IN.)
15 1 1 1 1 1 1 1 1
20 1 1 1 1 1 1 1 1
25 1 1-1/4 1 1 1 1 1 1
30 1 1-1/4 1 1 1 1 1 1
40 1 1-1/4 1 1 1 1 1 1
50 & 50A 1 2 1 1-1/4 1 1 1 1
60 1 2 1 1-1/4 1 1 1 1
70 1 2 1 2 1 1-1/4 1 1
80 1 2 1 2 1 1-1/4 1 1-1/4
100 1 2-1/2 1 2 1 1-1/4 1 1-1/4
100A 1 2-1/2 1 2 1 1-1/4 1 1-1/4
125 1 2-1/2 1 2 1 2 1 1-1/4
125A 1 2-1/2 1 2 1 2 1 1-1/4
150 1 2-1/2 1 2-1/2 1 2 1 2
175A 2
(1) 1
(1) 2-1/2
1 2-1/2 1 2 1 2
200 2
(1) 2-1/2
(1) 1-1/4
1 2-1/2 1 2 1 2
250 2
(1) 2
(1) 2-1/2
1 2-1/2 1 2-1/2 1 2
300 2 2-1/2 2
(1) 1
(1) 2-1/2
1 2-1/2 1 2-1/2
350 3
(2) 2-1/2
(1) 1
2
(1) 2-1/2
(1) 2
1 2-1/2 1 2-1/2
400 3
(1) 2
(2) 2-1/2
2
(1) 2
(1) 2-1/2
2
(1) 1
(1) 2-1/2
1 2-1/2
500 4
(1) 1
(3) 2-1/2
2 (2) 2-1/2 2
(1) 2-1/2
(1) 1-1/4
2
(1) 1
(1) 2-1/2
600 4
(3) 2-1/2
(1) 2
3
(1) 1-1/4
(2) 2-1/2
2
(1) 2
(1) 2-1/2
2
(1) 2-1/2
(1) 1-1/4
700 5
(1) 1
(4) 2-1/2
3
(1) 2
(2) 2-1/2
2 (2) 2-1/2 2
(1) 2-1/2
(1) 2
750 5
(1) 1
(4) 2-1/2
3
(1) 2
(2) 2-1/2
2 (2) 2-1/2 2
(1) 2-1/2
(1) 2
800 5
(1) 1
(4) 2-1/2
3
(1) 2
(2) 2-1/2
2 (2) 2-1/2 2
(1) 2-1/2
(1) 2
NOTES:
1.Hot water relief valves are Kunkle #537.
2. BHP followed by “A” designates hot water boilers furnished in a smaller vessel size with additional tubes in the
upper portion of the vessel.
Table A2-6. Hot Water Boiler Relief Valve Openings

20. A2-9
Firetube Boilers Model CB Boilers
07-02
NOTES

21. A2-10
Model CB Boilers Firetube Boilers
07-02
BOILER HP DIM 15 20 30 40 50 60 70 80 100
LENGTHS
Overall A 96-5/8 96-5/8 114-5/8 140-5/8 129 129 168 168 187
Shell B 62-5/8 62-5/8 80-5/8 106-5/8 92 92 131 131 150
Base Frame C 59 59 77 103 91 91 130 130 148
Front Head Extension D 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2
Rear Head Extension E 15-1/2 15-1/2 15-1/2 15-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2
Front Ring Flange to
Nozzle - 15 psig
F 36 36 45 57 46 46 65-1/2 65-1/2 75
Front Ring Flange to Nozzle - 150 psig F 36 36 45 57 46 46 72-1/2 72-1/2 82
Ring Flange to Base G 1-13/16 1-13/16 1-13/16 1-13/16 5/8 1/2 1/2 1/2 1/2
WIDTHS
Overall I 61 61 61 61 73 73 73 73 73
ID, Boiler J 36 36 36 36 48 48 48 48 48
Center to Water Column K 33 33 33 33 39 39 39 39 39
Center to Outside Hinge KK 22 22 22 22 29 29 29 29 29
Center to Lagging L 20 20 20 20 27 27 27 27 27
Center to Auxiliary LWCO LL 28 28 28 28 34 34 34 34 34
Base, Outside M 28 28 28 28 37-5/8 37-3/8 37-3/8 37-3/8 37-3/8
Base, Inside N 22 22 22 22 29-5/8 29-5/8 29-5/8 29-5/8 29-5/8
Figure A2-1. Model CB Steam Boiler Dimensions and Weights (15 and 150 psig Design Pressure -
15 to 100 hp) Sheet 1 of 2
NOTE: ALLOW 3 FEET
FOR DOOR SWING
PER NEC

22. A2-11
Firetube Boilers Model CB Boilers
07-02
BOILER HP DIM 15 20 30 40 50 60 70 80 100
HEIGHTS
Base to Steam Outlet (15 psig only) PL 50-1/4 50-1/4 50-1/4 50-1/4 64-3/4 64-3/4 64-3/4 64-3/4 64-3/4
Overall OO 66 66 66 66 78-3/4 78-3/4 78-3/4 78-3/4 78-3/4
Base to Vent Outlet O 53-1/2 53-1/2 53-1/2 53-1/2 70 70 70 70 70
Base to Steam Outlet (150 psig only) PH 50-1/4 50-1/4 50-1/4 50-1/4 66-31/2 66-1/2 66-1/2 66-1/2 64-3/4
Height of Base Q 8 8 8 8 12 12 12 12 12
Base to Bottom of Boiler R 12 12 12 12 16 16 16 16 16
BOILER CONNECTIONS
Chemical Feed H 1 1 1 1 1 1 1 1 1
Feedwater, Right and Left S 1 1 1 1 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4
Low Pressure (15 psig only)
Steam Nozzle
Drain, Front and Rear
U
W
4
1
4
1
4
1
6A
1-1/4
6A
1-1/4
6A
1-1/4
6A
1-1/2
6A
1-1/2
8A
1-1/2
High Pressure (150 psig only)
Surface Blowoff, Top CL
Steam Nozzle
Blowdown, Front and Rear
T
Y
W
1
1-1/2
1
1
1-1/2
1
1
2
1
1
2
1
1
3
1-1/4
1
3
1-1/4
1
3
1-1/4
1
3
1-1/4
1
4B
1-1/4
VENT STACK
Diameter (flgd connection) BB 6 6 8 8 10 10 12 12 12
Front Ring Flange to Vent CL CC 4 4 5 5 6 6 7 7 7
MINIMUM CLEARANCES
Rear Door SwingC DD 44 44 44 44 55 55 55 55 55
Front Door SwingC EE 44 44 44 44 55 55 55 55 55
Tube Removal, Rear FF 56 56 74 100 84 84 123 123 142
Tube Removal, Front GG 46 46 64 90 74 74 113 113 132
MINIMUM BOILER ROOM LENGTH ALLOWING FOR DOOR SWING AND TUBE REMOVAL FROM:
Rear of Boiler RR 163 163 199 251 231 231 309 309 347
Front of Boiler RF 153 153 189 241 221 221 299 299 337
Thru Window or Doorway RD 151 151 169 195 202 202 241 241 260
WEIGHT IN LBS
Normal Water Capacity 1340 1300 1710 2290 3130 2920 4620 4460 5088
Approx. Ship Wgt - 15 psig 3000 3100 3650 4350 6900 7000 8100 8200 9000
Approx. Ship Wgt - 150 psig 3100 3200 3800 4500 7000 7200 8800 9000 9500
Approx. Ship Wgt - 200 psig 3300 3400 4100 4700 7400 7600 9300 9500 10000
NOTES:
1. Air compressor belt driven from blower motor on sizes 15 thru 40
2. Air compressor module on sizes 50 thru 100 hp.
3. Accompanying dimensions, while sufficiently accurate for layout purposes, must be confirmed for construction by certified dimension
prints.
A. ANSI 150 psig flange.
B. ANSI 300 psig flange.
C. 15 thru 100 hp standard hinged door.
Figure A2-1. Model CB Steam Boiler Dimensions and Weights (15 and 150 psig Design Pressure -
15 to 100 hp) Sheet 2 of 2

23. A2-12
Model CB Boilers Firetube Boilers
07-02
Figure A2-2. Model CB Steam Boiler Dimensions and Weights (15 and 150 psig Design Pressure -
125 to 800 hp) Sheet 1 of 2
BOILER HP DIM 125 150 200 250 300 350 400 500 600 700 750 800
LENGTHS
Overall A 174-1/2 199-/12 232-1/2 197 227 257 210 244 284 317 319 319
Shell B 125 149 180 144 171 201 152 186 222 255 255 255
Base Frame C 124 148 179 143 170 200 151 185 221 254 254 254
Front Head Extension D 30 31 33 29 32 32 26 26 30 30 32 32
Rear Head Extension E 19-1/2 19-1/2 19-1/2 24 24 24 32 32 32 32 32 32
Front Ring Flange to Nozzle -
15 psig
F 62-1/2 74-1/2 90 72 85-1/2 100-1/2 76 93 111 127-1/2 127-1/2 127-1/2
Front Ring Flange to Nozzle -
150 psig
F 55 66 78 59-1/2 73 88 62 79 97 127-1/2 127-1/2 127-1/2
Ring Flange to Base G 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
WIDTHS
Overall I 85 85 85 103 103 103 123 123 123 123 123 123
ID, Boiler J 60 60 60 78 78 78 96 96 96 96 96 96
Center to Water Column K 45 45 45 54 54 54 64 64 64 64 64 64
Center to Outside Hinge KK 35 35 35 51 51 51 62 62 62 62 62 62
Center to Lagging L 33 33 33 42 42 42 51 51 51 51 51 51
Center to Auxiliary LWCO LL 40 40 40 49 49 49 59 59 59 59 59 59
Base, Outside M 52-1/2 52-1/2 52-1/2 64-3/8 64-3/8 64-3/8 72 72 72 72 72 72
Base, Inside N 44-1/2 44-1/2 44-1/2 52-3/8 52-3/8 52-3/8 56 56 56 56 56 56
NOTE: ALLOW 3 FEET
FOR DOOR SWING
PER NEC

24. A2-13
Firetube Boilers Model CB Boilers
07-02
BOILER HP DIM 125 150 200 250 300 350 400 500 600 700 750 800
HEIGHTS
Base to Steam Outlet (15 psig only) PL 77 77 77 96 96 96 116 116 116 116 116 116
Overall OO 88 88 88 106 106 106 126 126 126 126 126 126
Base to Vent Outlet O 85 85 85 106 106 106 126 126 126 126 126 126
Base to Steam Outlet (150 psig
only)
PH 77 77 77 96 96 96 116 116 116 116 116 116
Davit (Front) DF - - - 104 104 104 125 125 125 125 125 125
Davit (Rear) DR 84-3/4 84-3/4 84-3/4 104 104 104 126 126 126 126 126 126
Height of Base Q 12 12 12 10 10 10 12 12 12 12 12 12
Base to Bottom of Boiler R 16 16 16 17 17 17 19 19 19 19 19 19
BOILER CONNECTIONS
Chemical Feed H 1 1 1 1 1 1 1 1 1 1 1 1
Feedwater, Right and Left S 1-1/2 1-1/2 2 2 2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2
Low Pressure (15 psig only)
Steam Nozzle (Note A)
Drain, Front and Rear
U
W
8
1-1/2
8
1-1/2
10
2
10
2
12
2
12
2
12
2
12
2
12
2
12
2
12
2
12
2
High Pressure (150 psig only)
Surface Blowoff, Top CL
Steam Nozzle (Note B)
Blowdown, Front and Rear
T
Y
W
1
4
1-1/2
1
4
1-1/2
1
4
1-1/2
1
6
1-1/2
1
6
1-1/2
1
6
1-1/2
1
6
2
1
8
2
1
8
2
1
8
2
1
8
2
1
8
2
VENT STACK
Diameter (flgd. connection) BB 16 16 16 20 20 20 24 24 24 24 24 24
Front Ring Flange to Vent CL CC 9 9 9 10-1/2 10-1/2 10-1/2 12-1/2 12-1/2 12-1/2 12-1/2 12-1/2 12-1/2
MINIMUM CLEARANCES
Rear Door Swing DD 32C 32C 32C 43C 43C 43C 53C 53C 53C 53C 53C 53C
Front Door Swing EE 67 67 67 89C 89C 89C 108C 108C 108C 108C 108C 108C
Tube Removal, Rear FF 115 139 170 131 157 187 135 169 205 238 238 238
Tube Removal, Front GG 103 127 158 116 142 172 116 151 187 220 220 220
MINIMUM BOILER ROOM LENGTH ALLOWING FOR DOOR SWING AND TUBE REMOVAL FROM:
Rear of Boiler RR 307 355 417 364 417 477 395 463 535 601 601 601
Front of Boiler RF 260 308 370 303 356 416 322 390 462 528 528 528
Thru Window or Doorway RD 224 248 279 275 302 332 313 347 383 416 416 416
WEIGHT IN LBS
Normal Water Capacity 5750 7250 8625 10670 13000 15465 15340 19300 23425 27790 27790 27790
Approx. Ship Wgt - 15 psig 12200 12900 15200 21800 24000 27300 33500 38400 44000 51400 51400 51400
Approx. Ship Wgt - 150 psig 12800 13800 16300 23400 26000 28500 36500 41400 47000 54100 54100 54100
Approx. Ship Wgt - 200 psig 13400 14500 17100 25200 28000 30000 38300 44000 50500 57700 57700 57700
NOTES:
1. Air compressor belt driven from blower motor on sizes 125 thru 350 hp.
2. Control Panel relocation on boilers 250 hp and up.
3. Air compressor module on sizes 400 thru 800 hp.
4. Accompanying dimensions, while sufficiently accurate for layout purposes, must be confirmed for construction by certified dimension prints.
A. ANSI 150 psig flange.
B. ANSI 300 psig flange.
C. Davit equipped, standard, 125 - 800 hp (rear door).
D. Davit equipped, standard, 250- 800 hp (front door)
Figure A2-2. Model CB Steam Boiler Dimensions and Weights (15 and 150 psig Design Pressure -
125 to 800 hp) Sheet 2 of 2

25. A2-14
Model CB Boilers Firetube Boilers
07-02
Figure A2-3. Model CB Hot Water Boiler Dimensions (30 psig and 125 psig Design Pressure -
15 to 100 hp) - Sheet 1 of 2
BOILER HP DIM 15 20 30 40 50 60 70
80/
100A
100/
125A
LENGTHS
Overall A 97 97 114-5/8 140-5/8 129 129 168 168 187
Shell B 62-5/8 62-5/8 80-5/8 106-5/8 92 92 131 131 150
Base Frame C 59 59 77 103 91 91 130 130 148
Front Head Ext. D 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2
Rear Head Ext. E 15-1/2 15-1/2 15-1/2 15-1/2 18-1/2 18-1/2 18-1/2 18-1/2 18-1/2
Front Ring Flange to Return F 43-5/8 43-5/8 62 81 69 69 108 108 127
Front Ring Flange to Outlet G 55-1/8 55-1/8 73-1/8 98-1/2 84-5/8 84-5/8 123-5/8 123-5/8 142-5/8
Ring Flange to Base H 1-13/16 1-13/16 1-13/16 1-13/16 5/8 5/8 5/8 5/8 1
WIDTHS
Overall I 48-3/4 48-3/4 48-3/4 48-3/4 63 63 63 63 63
ID, Boiler J 36 36 36 36 48 48 48 48 48
Center to Entrance Box K 28-3/4 28-3/4 28-3/4 28-3/4 36 36 36 36 36
Center to Outside Hinge KK 22 22 22 22 29 29 29 29 29
Center to Lagging L 20 20 20 20 27 27 27 27 27
Base, Outside M 28 28 28 28 37-5/8 37-5/8 37-5/8 37-5/8 37-5/8
Base, Inside N 22 22 22 22 29-5/8 29-5/8 29-5/8 29-5/8 29-5/8
LWCO
NOTE: ALLOW 3 FEET
FOR DOOR SWING
PER NEC

26. A2-15
Firetube Boilers Model CB Boilers
07-02
BOILER HP DIM 15 20 30 40 50 60 70
80/
100A
100/
125A
HEIGHTS
Overall OO 66 66 66 66 72-5/8 72-5/8 72-5/8 72-5/8 72-5/8
Base to Vent Outlet O 53-1/2 53-1/2 53-1/2 53-1/2 70 70 70 70 70
Base to Return and outlet P 50 50 50 50 67 67 67 67 67
Davit (Front) DF - - - - - - - - -
Davit (Rear) DR - - - - - - - - -
Height of Base Q 8 8 8 8 12 12 12 12 12
Base to bottom of boiler R 12 12 12 12 16 16 16 16 16
BOILER CONNECTION
Waterfill Conn. Right & Left S 1 1 1 1 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4
Water Return - Threaded T 2-1/2 2-1/2 3 3 4 4 4 4 4
Water Outlet - ThreadedA U 2-1/2 2-1/2 3 3 4 4 4 4 4
Air Vent v 1 1 1 1 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4
Drain, Front and Rear W 1 1 1 1-1/4 1-1/4 1-1/4 1-1/2 1-1/2 1-1/2
Auxiliary Connection X 1 1 1 1 1 1 1 1 1
VENT STACK
Diameter (flgd. connection) BB 6 6 8 8 10 10 12 12 12
Front Ring Flange to vent CL CC 4 4 5 5 6 6 7 7 7
MINIMUM CLEARANCES
Rear Door Swing DD 44 44 44 44 55 55 55 55 55
Front Door Swing EE 44 44 44 44 55 55 55 55 55
Tube Removal, Rear FF 56 56 74 100 84 84 123 123 142
Tube, Removal, Front GG 46 46 64 90 74 74 113 113 132
MINIMUM BOLER ROOM LENGTH ALLOWING FOR DOOR SWING AND TUBE REMOVAL FROM:
Rear of Boiler RR 163 163 199 251 231 231 309 309 347
Front of Boiler RF 153 153 189 241 221 221 299 299 337
Thru Window or Doorway RD 151 151 169 195 202 202 241 241 260
WEIGHT IN LBS
Water Capacity Flooded 1500 1460 1915 2585 3665 3500 5420 5250 5960
Approx. Ship. Wgt. – 30 psig
Approx. Ship. Wgt. – 125 psig
3000
3300
3100
3400
3650
3880
4350
4580
6800
7100
7000
7300
8000
8350
8100
8450
8800
9150
NOTES:
1. Accompanying dimensions and ratings while sufficiently accurate for layout purposes, must be confirmed for construction
by certified dimension prints.
2. Air compressor belt driven from blower motor on sizes 15 thru 40 hp.
3. Air compressor module on sizes 50 thru 100 hp.
4. 15 - 100 hp, hinged door standard.
5. Add 370lbs to the 80 hp ship weight for 100A and 485 lbs to the 100 hp ship weight for the 125A.
A. Dip Tube included.
Figure A2-3. Model CB Hot Water Boiler Dimensions (30 psig Design Pressure -
15 to 100 hp) - Sheet 2 of 2

27. A2-16
Model CB Boilers Firetube Boilers
07-02
Figure A2-4. Model CB HotWater Boiler Dimensions (30 psig Design Pressure - 125 - 800 hp) - Sheet 1 of 2
A
BOILER HP DIM 125
150/
175A
200 250 300 350 400 500 600 700 750 800
LENGTHS
Overall A 174-1/2 199-1/2 232-1/2 197 227 257 210 244 284 317 319 319
Shell B 125 149 180 144 171 201 152 186 222 255 255 255
Base Frame C 124 148 179 143 170 200 151 185 221 254 254 254
Front Head Extension D 30 31 33 29 32 32 26 26 30 30 32 32
Rear Head Extension E 19-1/2 19-1/2 19-1/2 24 24 24 32 32 32 32 32 32
Front Ring Flange to Return F 91 102 131 104-1/2 131-1/2 161-1/2 111-1/2 139 175 207 207 207
Front Ring Flange to Outlet G 114 136 167 131 158 188 146 170 206 239 239 239
Ring Flange to Base H 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
WIDTHS
Overall I 75-1/2 75-1/2 75-1/2 93 93 93 113 113 113 113 113 113
ID, Boiler J 60 60 60 78 78 78 96 96 96 96 96 96
Center to Entrance Box K 42-1/2 42-1/2 42-1/2 51 51 51 62 62 62 62 62 62
Center to Outside Hinge KK 35 35 35 51 51 51 62 62 62 62 62 62
Center to Lagging L 33 33 33 42 42 42 51 51 51 51 51 51
Base, Outside M 52-1/2 52-1/2 52-1/2 64-3/8 64-3/8 64-3/8 72 72 72 72 72 72
Base, Inside N 44-1/2 44-1/2 44-1/2 52-3/8 52-3/8 52-3/8 56 56 56 56 56 56
LWCO
NOTE: ALLOW 3 FEET
FOR DOOR SWING
PER NEC

28. A2-17
Firetube Boilers Model CB Boilers
07-02
Figure A2-4. Model CB Hot Water Boiler Dimensions (30 psig Design Pressure - 125 - 800 hp) - Sheet 2 of 2
BOILER HP DIM 125
150/
175A
200 250 300 350 400 500 600 700 750 800
HEIGHTS
Overall OO 88 88 88 106 106 106 126 126 126 126 126 126
Base to Vent Outlet O 85 85 85 106 106 106 126 126 126 126 126 126
Base to Return and Outlet P 77 77 77 96 96 96 116 116 116 116 116 116
Davit (Front) DF - - - 104 104 104 125 125 125 125 125 125
Davit (Rear) DR 84-3/4 84-3/4 84-3/4 104 104 104 126 126 126 126 126 126
Height of Base Q 12 12 12 10 10 10 12 12 12 12 12 12
Base to Bottom of Boiler R 16 16 16 17 17 17 19 19 19 19 19 19
BOILER CONNECTION
Waterfill Conn. Right & Left S 1-1/2 1-1/2 2 2 2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2
Water Return FlangeA T 6 6 6 8 8 8 10 10 12 12 12 12
Water Outlet Flange U 6 6 6 8 8 8 10 10 12 12 12 12
Air Vent V 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 2 2 2 2 2 2
Drain, Front and Rear W 1-1/2 1-1/2 2 2 2 2 2 2 2 2 2 2
Auxiliary Connection X 1 1 1 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4
VENT STACK
Diameter (flgd. connection) BB 16 16 16 20 20 20 24 24 24 24 24 24
Front Ring Flange to vent CL CC 9 9 9 10-1/2 10-1/2 10-1/2 12-1/2 12-1/2 12-1/2 12-1/2 12-1/2 12-1/2
MINIMUM CLEARANCES
Rear Door Swing DD 32B
32B 32B 43B
43B 43B 53B 53B 53B 53B 53B 53B
Front Door Swing EE 67 67 67 89B 89B 89B 108B 108B 108B 108B 108B 108B
Tube Removal, Rear FF 115 139 170 131 157 187 135 169 205 238 238 238
Tube, Removal, Front GG 103 127 158 116 142 172 117 151 187 220 220 220
MINIMUM BOILER ROOM LENGTH ALLOWING FOR DOOR SWING AND TUBE REMOVAL FROM:
Rear of Boiler RR 307 355 417 364 417 477 395 463 535 601 601 601
Front of Boiler RF 260 308 370 303 356 416 322 390 462 528 528 528
Thru Window or Doorway RD 224 248 279 275 302 332 313 347 383 416 416 416
WEIGHT IN LBS
Water Capacity Flooded 7670 9295 11130 13880 16840 20090 20630 25925 31510 36600 36600 36600
Approx. Ship. Wgt. – 30 psig 12100 12800 15100 21700 23900 27200 33400 38300 43900 51300 51300 51300
Approx. Ship. Wgt. – 125 psig 12500 13200 15500 22500 24700 28000 34400 39300 44900 52300 52300 52300
NOTES:
1. Accompanying dimensions and ratings while sufficiently accurate for layout purposes, must be confirmed for construction
by certified dimension prints.
2. Control panel relocated on boilers 250 hp and up.
3. Air compressor belt driven from blower motor on sizes 125 thru 350 hp.
4. Air compressor module on sizes 400 thru 800 hp.
5. Davited front doors are standard on 250 - 800 hp.
6. Add 480 lbs to the 150 hp ship weight for 175A.
A. Dip Tube included.
B. Davited rear doors are standard on 125 - 800 hp units.

29. A2-18
Model CB Boilers Firetube Boilers
07-02
BOILER HP
DIMENSION (INCHES)
A B C D E
15 - 40, 50A 20 36 28 45 20
50 - 100, 100A, 125A 27 48 38 60 26
125 - 200, 175A 33 55 45 68 32
250 - 350 42 69 58 86 43
400 - 800 51 88 71 109 53
NOTE:
1. Dimensions in inches.
2. 15 - 100 hp (100A & 125A)
boilers are standardly equipped with hinges. Davit available as an
option.
Figure A2-5. Space Required to Open Rear Head on Model CB Boilers Equipped with Davits
PLAN VIEW
Figure A2-6. Lifting Lug Location, Model CB Boilers - Sheet 1 of 2

30. A2-19
Firetube Boilers Model CB Boilers
07-02
BOILER
HP
VIEW
ALL DIMENSIONS IN INCHES
A B C D E
15 Steam A 51-3/4 12 38-3/4 - 2-1/2
Hot Water B 50-1/2 12 38-3/4 6 2-1/2
20 Steam A 51-3/4 12 38-3/4 - 2-1/2
Hot Water B 50-1/2 12 38-3/4 6 2-1/2
25 Steam A 51-3/4 12 56-3/4 - 2-1/2
Hot Water B 50-1/2 12 56-3/4 6 2-1/2
30 Steam A 51-3/4 12 56-3/4 - 2-1/2
Hot Water B 50-1/2 12 56-3/4 6 2-1/2
40 Steam A 51-3/4 12 82-3/4 - 2-1/2
Hot Water B 50-1/2 12 82-3/4 6 2-1/2
50A
Water B 50-1/2 12 82-3/4 6 2-1/2
50 All B 68 18 57 10 2-1/2
60 All B 68 18 57 10 2-1/2
70 All B 68 27 67 10 2-1/2
80 All B 68 27 67 10 2-1/2
100 All B 68 27 86 10 2-1/2
100A Hot Water B 68 27 67 10 2-1/2
125A Hot Water B 68 27 100 10 2-1/2
125 All B 80-1/4 29-3/4 70-1/2 10 2-1/2
150 All A 80-1/4 29-3/4 83-1/2 10 2-1/2
175A Hot Water B 80-1/4 29-3/4 83-1/2 10 2-1/2
200 All B 80-1/4 29-3/4 114-1/2 10 2-1/2
250 Steam B 99 36 72 10 3
Hot Water B 99 36 72 10 3
300 Steam B 99 36 99 10 3
Hot Water B 99 36 99 10 3
350 Steam B 99 36 129 10 3
Hot Water B 99 36 129 10 3
400 Steam B 119 34-1/2 83 10 3
Hot Water B 119 34-1/2 83 11 3
500 Steam B 119 34-1/2 117 11 3
Hot Water B 119 34-1/2 117 11 3
600 Steam B 119 34-1/2 153 11 3
Hot Water B 119 34-1/2 153 11 3
700 Steam B 119 34-1/2 186 11 3
Hot Water B 119 34-1/2 186 11 3
750 Steam B 119 34-1/2 186 11 3
Hot Water B 119 34-1/2 186 11 3
800 Steam B 119 34-1/2 186 11 3
Hot Water B 119 34-1/2 186 11 3
NOTE:
1. A, B and C Dimensions may vary by 1/2 inch.
2. BHP followed by “A” designates hot water boilers furnished in a smaller vessel size with additional tubes in upper portion of vessel.
Figure A2-6. Lifting Lug Location, Model CB Boilers - Sheet 2 of 2

31. A2-20
Model CB Boilers Firetube Boilers
07-02
BOILER HP A B C D E F G X
15-20 6 8 59 17 33 3 22 9-3/4
25-30 6 8 77 17 33 3 22 9-3/4
40-50A 6 8 103 17 33 3 22 9-3/4
50-60 6 8 91 26 42 4 29-5/8 8-1/4
70-80, 100A 6 8 130 26 42 4 29-5/8 8-1/4
100, 125A 6 8 148 26 42 4 29-5/8 8-1/4
125 6 9 124 39-1/2 57-1/2 4 44-1/2 10-1/4
150, 175A 6 9 148 39-1/2 57-1/2 4 44-1/2 10-1/4
200 6 9 179 39-1/2 57-1/2 4 44-1/2 10-1/4
250 6 12 143 46 70 6 52-3/8 22-1/2
300 6 12 170 46 70 6 52-3/8 22-1/2
350 6 12 200 46 70 6 52-3/8 22-1/2
400 6 14 151 50 78 8 56 24-1/2
500 6 14 185 50 78 8 56 24-1/2
600 6 14 221 50 78 8 56 24-1/2
700-750-800 6 14 254 50 78 8 56 24-1/2
NOTE:
1. All numbers in table are in inches.
2. 6-inch high mounting piers recommended for use beneath the boiler base frame. The use of these piers provides increased inspection
accessibility to the piping beneath the boiler and added height for washing down the area beneath the boiler.
Figure A2-7. Model CB Boiler Mounting Piers

32. A2-21
Firetube Boilers Model CB Boilers
07-02
PERFORMANCE DATA
Efficiency
Tables A2-7, A2-8, A2-9, A2-10, A2-11, and A2-12 show pre-
dicted fuel-to-steam efficiencies (including radiation and con-
vection losses) for Cleaver-Brooks Model CB Firetube boilers.
For specific efficiencies on firetube boiler offerings not listed
here, contact your local Cleaver-Brooks authorized representa-
tive.
Cleaver-Brooks offers an industry leading fuel-to-steam boiler
efficiency guarantee for Model CB Firetube Boilers. The guar-
antee is based on the fuel-to-steam efficiencies shown in the
efficiency tables and the following conditions. The efficiency
percent number is only meaningful if the specific conditions of
the efficiency calculations are clearly stated in the specifica-
tion (see Cleaver-Brooks publication CB-7768 for a detailed
description of efficiency calculations).
The boiler manufacturer shall guarantee that, at the time of
startup, the boiler will achieve fuel-to-steam efficiency (as
shown in the tables listed above) at 100% firing rate (add effi-
ciency guarantees at 25%, 50%, and 75% of rating, if
required). If the boiler(s) fail to achieve the corresponding
guaranteed efficiency as published, the boiler manufacturer
will rebate, to the ultimate boiler owner, five thousand dollars
($5,000) for every full efficiency point (1.0%) that the actual
efficiency is below the guaranteed level. The specified boiler
efficiency is based on the following conditions.
1. Fuel specification used to determine boiler efficiency:
• Natural Gas
Carbon, % (wt) = 69.98
Hydrogen, % (wt) = 22.31
Sulfur, % (wt) = 0.0
Heating value, Btu/lb = 21,830
• No. 2 Oil
Carbon, % (wt) = 85.8
Hydrogen, % (wt) = 12.7
Sulfur, % (wt) = 0.2
Heating value, Btu/lb = 19,420
• No. 6 Oil
Carbon, % (wt) = 86.6
Hydrogen, % (wt) = 10.9
Sulfur, % (wt) = 2.09
Heating value, Btu/lb = 18,830
2. Efficiencies are based on ambient air temperature of 80 °F,
relative humidity of 30%, and 15% excess air in the exhaust
flue gas.
3. Efficiencies are based on manufacturer’s published radiation
and convection losses. (For Cleaver-Brooks radiation and con-
vection losses, see Boiler Efficiency Facts Guide, publication
number CB-7767).
4. Any efficiency verification testing will be based on the stack
loss method.
When specifying the efficiencies in the tables, be sure to
include the specific guarantee conditions to maximize the
effectiveness of your efficiency specification. If you have any
questions regarding the efficiency specifications, please con-
tact your local Cleaver-Brooks authorized representative. For
efficiencies and stack temperatures at operating pressures not
listed, follow these procedures:
When the operating steam pressure is between 10 psig and 125
psig, interpolate the values from the efficiency tables.
When the operating steam pressure is above 125 psig, esti-
mated efficiency can be calculated as follows:
Example:
Boiler: 350 hp.
Fuel: natural gas.
Operating steam pressure: 200 psig.
Find the fuel-to-steam efficiency at 100% firing rate. From
Table A2-8 for a 350 hp boiler operating at 100% firing rate
and an operating steam pressure of 125 psig, the efficiency is
82.5%.
Using Figure A2-8, note that the stack temperature increases
36 °F at the higher operating pressure. To estimate boiler effi-
ciency, use this rule of thumb: For every 40 °F increase in stack
temperature, efficiency decreases by 1%. Since the stack tem-
perature rise is 36 °F, the decrease in the boiler efficiency at
200 psig operating pressure is calculated as follows: 36/40 =
.9%. Therefore, the boiler efficiency at 200 psig operating
pressure is 82.5 - .9 = 81.6%.
Emissions
The emission data included in this section consists of typical
uncontrolled emission levels for Cleaver-Brooks Model CB
Firetube Boilers.
Cleaver-Brooks Firetube boilers are available with the standard
burner package for Model CB, or optional internal flue gas
recirculation on Model CB (LE) (refer to Section A3).
The Cleaver-Brooks IFGR packages are integrated boiler/
burner/control packages designed specifically for Cleaver-
Brooks boilers. For detailed information on Cleaver-Brooks
IFGR packages, refer to Model CB (LE) in Section A3.
NOTICE
The data in Table A2-13 represents typical emission
levels only. Guaranteed emission levels are available
from your local Cleaver-Brooks authorized represen-
tative.

33. A2-22
Model CB Boilers Firetube Boilers
07-02
BOILER
HP
FIRING RATE (%)
25 50 75 100
50 83.0 83.2 82.9 82.4
60 82.9 83.1 82.7 82.3
70 84.5 84.7 84.3 83.9
80 84.6 84.8 84.5 84.0
100 84.4 85.0 84.8 84.4
125 83.3 83.6 83.4 83.2
150 84.4 84.6 84.5 84.3
200 85.0 85.3 85.1 84.9
250 85.0 84.7 84.0 83.3
300 85.3 85.3 84.6 83.9
350 85.3 85.7 85.2 84.5
400 84.5 84.7 84.6 84.4
500 85.5 85.7 85.5 85.2
600 85.7 86.0 85.8 85.6
700 85.7 86.2 86.0 85.7
750 85.8 86.1 85.9 85.6
800 85.8 86.1 85.9 85.6
Table A2-7. Predicted Fuel-to-Steam Efficiencies (%),
Model CB Boilers - 10 psig, Natural Gas
BOILER
HP
FIRING RATE (%)
25 50 75 100
50 80.2 80.5 80.4 80.1
60 80.1 80.4 80.3 80.1
70 81.7 82.0 81.9 81.7
80 81.8 82.1 82.0 81.8
100 81.5 82.4 82.3 82.2
125 80.4 80.9 81.0 81.0
150 81.5 82.0 82.0 82.1
200 82.2 82.7 82.7 82.7
250 82.0 82.0 81.6 81.3
300 82.6 82.7 82.2 81.9
350 82.6 83.2 82.8 82.5
400 81.8 82.2 82.4 82.2
500 82.8 83.2 83.3 83.1
600 82.9 83.5 83.6 83.5
700 83.0 83.6 83.6 83.6
750 83.1 83.6 83.7 83.5
800 83.1 83.6 83.7 83.5
Table A2-8. Predicted Fuel-to-Steam Efficiencies (%),
Model CB Boilers - 125 psig, Natural Gas
BOILER
HP
FIRING RATE (%)
25 50 75 100
50 86.8 87.0 86.6 86.1
60 86.7 86.9 86.5 86.0
70 88.4 88.6 88.2 87.7
80 88.5 88.7 88.3 87.8
100 88.2 88.5 88.3 88.0
125 87.2 87.4 87.2 87.0
150 88.4 88.5 88.3 88.1
200 88.9 89.2 88.9 88.7
250 88.8 88.5 87.8 87.1
300 89.1 89.2 88.4 87.7
350 89.1 89.5 89.0 88.4
400 88.4 88.5 88.4 88.1
500 89.4 89.5 89.3 89.2
600 89.5 89.9 89.7 88.4
700 89.6 90.0 89.8 89.6
750 89.7 90.0 89.8 89.5
800 89.7 90.0 89.8 89.5
Table A2-9. Predicted Fuel-to-Steam Efficiencies (%),
Model CB Boilers - 10 psig, No. 6 Oil
BOILER
HP
FIRING RATE (%)
25 50 75 100
50 83.9 84.2 84.0 83.8
60 83.8 84.1 83.9 83.8
70 85.5 85.8 85.6 85.4
80 85.6 85.9 85.7 85.6
100 84.6 85.8 85.9 85.8
125 84.1 84.6 84.7 84.8
150 85.3 85.8 85.8 85.8
200 86.0 86.5 86.4 86.5
250 85.8 85.7 85.3 85.0
300 86.3 86.4 86.0 85.6
350 86.4 87.0 86.6 86.2
400 85.5 85.9 86.0 85.9
500 86.5 86.9 87.0 86.9
600 86.7 87.3 87.4 87.2
700 86.8 87.3 87.4 87.4
750 86.9 87.4 87.5 87.3
800 86.9 87.4 87.5 87.3
Table A2-10. Predicted Fuel-to-Steam Efficiencies (%),
Model CB Boilers - 125 psig, No 6 Oil

34. A2-23
Firetube Boilers Model CB Boilers
07-02
BOILER
HP
FIRING RATE (%)
25 50 75 100
50 86.5 86.7 86.3 85.8
60 86.3 86.6 86.2 85.7
70 87.9 88.2 87.8 87.3
80 88.1 88.3 87.9 87.4
100 87.8 88.4 88.1 87.7
125 86.7 86.9 86.7 86.6
150 87.8 88.0 87.8 87.6
200 88.4 88.7 88.4 88.2
250 88.3 88.1 87.4 86.7
300 88.6 88.7 88.0 87.3
350 88.6 89.0 88.5 87.8
400 87.9 88.1 87.9 87.6
500 88.9 89.0 88.9 88.6
600 89.0 89.4 89.2 89.0
700 89.1 89.5 89.3 89.1
750 89.2 89.5 89.3 89.0
800 89.2 89.5 89.3 89.0
Table A2-11. Predicted Fuel-to-Steam Efficiencies (%),
Model CB Boilers - 10 psig, No. 2 Oil
BOILER
HP
FIRING RATE (%)
25 50 75 100
50 83.6 84.0 83.8 83.5
60 83.5 83.8 83.7 83.5
70 85.1 85.4 85.3 85.1
80 85.2 85.6 85.4 85.3
100 84.8 85.7 85.6 85.5
125 83.7 84.2 84.3 84.3
150 84.8 85.3 85.3 85.4
200 85.6 86.0 86.0 86.0
250 85.3 85.3 84.9 84.7
300 85.9 86.0 85.5 85.2
350 85.9 86.6 86.1 85.8
400 85.1 85.5 85.6 85.5
500 86.1 86.5 86.6 86.4
600 86.2 86.8 86.9 86.8
700 86.3 86.9 87.0 86.9
750 86.4 86.9 87.0 86.8
800 86.4 86.9 87.0 86.8
Table A2-12. Predicted Fuel-to-Steam Efficiencies (%),
Model CB Boilers - 125 psig, No. 2 Oil
Figure A2-8. Predicted StackTemperature Increase for Pressure GreaterThan 125 psig

35. A2-24
Model CB Boilers Firetube Boilers
07-02
ENGINEERING DATA
The following engineering information is provided for Model
CB Firetube Boilers. Additional detail is available from your
local Cleaver-Brooks authorized representative. Refer to
Tables A2-14 through A2-18.
Blowdown Water Requirements
Some local codes require blowdown tanks to be constructed in
accordance with recommendations of the National Board of
Boiler and Pressure Vessel Inspectors.
The National Board’s recommendations base the size of the
blowdown tank on the removal of at least 4 inches of water
from the boiler.
Table A2-19 lists the approximate quantity of water repre-
sented by 4 inches of water at normal operating level for
Cleaver-Brooks Model CB Boilers.
POLLUTANT
ESTIMATED LEVELS - UNCONTROLLED
NATURAL GAS NO. 2 OILB
NO. 6 OILC
CO
ppmA
200 90 95
Lb/MMBtu 0.15 0.07 0.075
NOx
ppmA
100 185 502
Lb/MMBtu 0.12 0.25 0.67
SOx
ppmA
1 278 278
Lb/MMbtu 0.001 0.52 0.52
HC/VOCs
ppmA
40 50 70
Lb/MMBtu 0.016 0.025 0.035
PM
ppmA
- - -
Lb/MMBtu 0.01 0.025 0.160
NOTES:
Refer to Section E for detailed emission information.
A. ppm levels corrected to 3% O2, dry basis.
B. Based on fuel constituent levels of:
Fuel-bound nitrogen content = 0.05% by weight
Sulfur content = 0.5% by weight
Ash content = 0.01% by weight
C. Based on fuel constituent levels of:
Fuel-bound nitrogen content = 0.7% by weight
Sulfur content = 0.5% by weight
Ash content = 0.1% by weight
Conradson carbon residue = 16% by weight
Table A2-13. Model CB Boiler Emission Data
BOILER
HP
HEATING SURFACE (SQ-FT)
FIRESIDE WATERSIDE
15 75 85
20 100 109
25 125 144
30 150 162
40 200 219
50 250 266
60 300 323
70 350 388
80 400 441
100 500 544
125 625 679
150 750 820
200 1000 1092
250 1250 1346
300 1500 1623
350 1750 1932
400 2000 2151
500 2500 2691
600 3000 3262
700 3500 3810
750 3500 3810
800 3500 3810
Table A2-14. Heating Surface, Model CB Boilers

36. A2-25
Firetube Boilers Model CB Boilers
07-02
BOILER HP
STEAM VOLUME CU-FT STEAM RELIEVING AREA, SQ-IN
HIGH PRESSUREA
LOW PRESSUREB
HIGH PRESSUREA
LOW PRESSUREB
15 2.9 5.9 1356 1637
20 2.9 5.9 1356 1637
25 & 30 3.9 7.9 1817 2195
40 5.3 10.8 2485 2999
50 9.7 16.0 2959 3372
60 9.7 16.0 2959 3372
70 14.3 23.7 4367 4975
80 14.3 23.7 4367 4975
100 16.6 27.4 5053 5757
125 25.4 36.6 5371 5887
150 30.7 44.3 6511 7138
200 37.7 54.4 7985 8752
250 49.2 70.6 7980 8695
300 59.5 85.3 9651 10516
350 70.9 101.7 11507 12538
400 75.8 102.5 10148 10960
500 95.0 128.5 12722 13740
600 115.4 156.1 15448 16685
700-750-800 134.0 181.3 17948 19385
NOTE: Based on normal water level.
A. Based on 150 psig design pressure.
B. Based on 15 psig design pressure.
Table A2-15. Steam Volume and Disengaging Area
BOILER
HP
BOILER
OUTPUT
(1000)
BTU/HR
SYSTEM TEMPERATURE DROP - DEGREES F
10 20 30 40 50 60 70 80 90 100
MAXIMUM CIRCULATING RATE - GPM
15 500 100 50 33 25 20 17 14 12 11 10
20 670 134 67 45 33 27 22 19 17 15 13
30 1005 200 100 67 50 40 33 29 25 22 20
40 1340 268 134 89 67 54 45 38 33 30 27
50 1675 335 168 112 84 67 56 48 42 37 33
60 2010 402 201 134 101 80 67 58 50 45 40
70 2345 470 235 157 118 94 78 67 59 52 47
80 2680 536 268 179 134 107 90 77 67 60 54
100 & 100A 3350 670 335 223 168 134 112 96 84 75 67
125 &125A 4185 836 418 279 209 168 140 120 105 93 84
150 5025 1005 503 335 251 201 168 144 126 112 100
175A 5858 1172 586 391 293 234 195 167 147 130 117
200 6695 1340 670 447 335 268 224 192 168 149 134
250 8370 1675 838 558 419 335 280 240 210 186 167
300 10045 2010 1005 670 503 402 335 287 251 223 201
350 11720 2350 1175 784 587 470 392 336 294 261 236
400 13400 2680 1340 895 670 535 447 383 335 298 268
500 16740 3350 1675 1120 838 670 558 479 419 372 335
600 20080 4020 2010 1340 1005 805 670 575 502 448 402
700 23450 4690 2345 1565 1175 940 785 670 585 520 470
750 25106 5025 2510 1675 1255 955 840 720 625 555 500
800 26780 5360 2680 1785 1340 1075 895 765 670 595 535
NOTES: 1. Minimum recommended return water temperature is 150 °F. Minimum recommended outlet temperature for Model CB Hot Water
Boilers is 170 °F. Contact your local Cleaver-Brooks authorized representative for special hot water application information.
2. See Section H2 for over-pressure requirements.
Table A2-16.Water Circulation Rate andTemperature Drop for Hot Water Boiler

37. A2-26
Model CB Boilers Firetube Boilers
07-02
BOILER HP
OPERATING
PRESSURE
PSIG
15 20 25 30 40 50 60 70 80 100 125 150 200 250 300 350 400 500 600 700 750 800
15 4 4 4 4 6 6 6 6 6 8 8 8 10 10 12 12 12 12 12 12 12 12
30 2 2 2.5 2.5 3 4 4 4 4 6 6 6 8 8 8 10 10 10 12 12 12 12
40 2 2 2.5 2.5 3 3 4 4 4 6 6 6 6 8 8 8 10 10 10 12 12 12
50 1.5 2 2 2.5 2.5 3 3 4 4 4 6 6 6 6 8 8 8 8 10 10 12 12
75 1.5 2 2 2 2.5 3 3 3 4 4 4 4 6 6 6 8 8 8 8 10 10 10
100 1.5 1.5 2 2 2 3 3 3 3 4 4 4 6 6 6 6 6 8 8 8 8 10
125 1.5 1.5 2 2 2 3 3 3 3 4 4 4 4 6 6 6 6 8 8 8 8 8
150 1.5 1.5 2 2 2 2.5 2.5 2.5 2.5 2.5 3 3 4 4 6 6 6 6 6 8 8 8
200 1.5 1.5 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5 3 4 4 4 4 6 6 6 6 6 6
250 1.5 1.5 2 2 2 2 2 2 2 2 2.5 2.5 3 4 4 4 4 6 6 6 6 6
NOTES:
1. Steam nozzle sizes given in inches.
2. Recommended steam nozzle sizes based on 4000 to 5000 fpm steam velocity. Spool pieces (300 lb flanges) are available in the following sizes (in inches): 3x2-
1/2x30, 4x3x30, 6x4x36, 8x6x48, 10x8x48, and 12x8x48.
3. All standard steam nozzle sizes for 150 psig design pressure or greater are the same as 125 psig operating pressure on the above table. To increase or decrease
the standard size, request the change with your local Cleaver-Brooks authorized representative.
Table A2-17. Recommended Steam Nozzle Size (To Maintain 4000 to 5000 fpm Nozzle Velocity)
BOILER
HP
BOILER
CAPACITY
(LBS/HR)
OPERATING PRESSURES (PSIG)
50 75 100 125 150 175 200 250
100 3450 3 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2 2-1/2
125 4313 4 3 3 3 3 2-1/2 2-1/2 2-1/2
150 5175 4 4 3 3 3 3 2-1/2 2-1/2
200 6900 4 4 4 3 3 3 3 3
250 8625 4 4 4 4 3 3 3 3
300 10350 6 4 4 4 4 4 4 3
350 12025 6 6 4 4 4 4 4 3
400 13800 6 6 4 4 4 4 4 4
500 17210 6 6 6 6 4 4 4 4
600 20700 8 8 6 6 6 4 4 4
700 24150 8 8 6 6 6 6 6 6
750 25875 8 8 6 6 6 6 6 6
800 27600 8 8 6 6 6 6 6 6
Note: Valve sizes (300 psig flanges) given in inches.
Table A2-18. Recommended Non-Return Valve Size

38. A2-27
Firetube Boilers Model CB Boilers
07-02
Sound Level
Table A2-20 summarizes predicted sound pressure levels for
Model CB Boilers. Tables A2-21 through A2-25 give detailed
octave band sound pressure levels for each boiler. These values
are based on standard motors. Optional motor types and alti-
tude conditions can increase sound levels.
Units
The units for the sound level tables are dBA (decibels, mea-
sured on the A-weighted scale) in reference to 0.0002
microbars (20 micro-Newtons per square meter). They are
standardly referenced in specifying and reporting sound pres-
sure levels on industrial equipment.
Test Method
The sound pressure levels in the above tables were obtained
from tests in accordance with the "ABMA Test Code for the
Measurement of Sound from Packages Boilers." In accordance
with this code, the sound pressure levels reported were mea-
sured on the boiler centerline 4-1/2 feet vertically above the
bottom of the base rails and 3 feet horizontally in front of the
end of the blower motor or front surface of the electrical cabi-
net.
Sound Level Meter
The sound level meter used complies with ANSI S1.4, Type 1
(Precision). The readings are taken with the meter set for slow
response.
BOILER HP WATER (GAL.)
15-20 26
25-30 34
40 47
50-60 55
70-80 80
100 93
125 97
150 118
200 145
250 146
300 176
350 210
400 183
500 230
600 280
700-750 325
800 325
NOTE: Quantity of water removed from boiler by lowering normal wa-
ter line 4".
Table A2-19. Model CB BlowdownTank Sizing Information
BOILER
HP
50 60 70 80 100 125A 125 150 200 250 300 350 400 500 600 700 750 800
HFO, dBA 79 79 79 79 81 82 83 83 83 88 88 89 83 83 83 85 87 88
LFO, dBA 78 78 78 78 79 79 81 82 81 86 86 85 80 82 82 82 83 84
HFG, dBA 77 77 78 78 78 79 81 80 82 84 86 86 82 82 82 85 86 87
LFG, dBA 72 73 74 75 75 75 78 77 78 81 82 83 80 81 81 82 83 84
NOTES:
1. Boiler No. followed by an “a” designates hot water boilers furnished in a smaller vessel size with additional tubes
in the upper portion of the vessel.
2. Sound Pressure levels measured on boilers operating in various locations and expressed in dBA are as follows:
ABBREVIATIONS:
HF = High Fire
LF = Low Fire
O = Oil
G = Gas
Table A2-20. Sound Pressure Level Summary (50 - 800 hp)
FIRING
RATE
FUEL
SOUND
LEVEL
dBA
OCTAVE BAND SOUND PRESSURE LEVELS IN dB RE .0002 MICROBAR
31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz
40HP
A
LFG 76 73 75 72 74 76 70 67 68 64 57
LFO 77 73 75 75 76 75 72 67 66 66 58
HFG 79 81 78 74 80 78 71 69 68 64 58
HFO 79 72 77 77 81 78 73 69 66 66 58
NOTE:
ABBREVIATIONS:
HF = High Fire
LF = Low Fire
O = Oil
G = Gas
A. The data shown above was taken on the 40 hp. Since the highest Sound Level is below 80
dBA, no additional 36" diameter Firetubes were tested. If Sound Level predictions are required
for the 15 thru 30 hp, use the values shown for the 40 hp.
Table A2-21. Model CB Boiler Sound Pressure Level Details (40 hp)

39. A2-28
Model CB Boilers Firetube Boilers
07-02
FIRING
RATE
FUEL
SOUND
LEVEL
dBA
OCTAVE BAND SOUND PRESSURE LEVELS IN dB RE .0002 MICROBAR
31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz
50 HP
LFG 72 71 65 71 71 70 68 63 60 53 46
LFO 78 71 76 78 73 72 72 76 61 56 54
HFG 77 72 68 75 76 74 74 66 61 54 47
HFO 79 72 70 75 75 77 77 70 63 56 54
60 HP
LFG 73 70 75 72 72 73 68 61 56 50 45
LFO 78 68 77 74 74 75 74 71 58 53 48
HFG 77 73 75 72 72 75 76 63 55 50 44
HFO 79 75 75 75 75 77 77 72 59 52 45
70 HP
LFG 74 70 70 75 74 73 71 62 56 51 46
LFO 78 70 73 77 74 75 74 70 59 53 57
HFG 78 72 72 77 78 75 76 68 58 52 57
HFO 79 73 73 80 77 77 76 70 60 54 48
80 HP
LFG 75 70 75 75 73 75 76 66 62 62 53
LFO 78 69 77 76 74 76 74 73 63 62 57
HFG 78 72 74 78 75 75 76 57 61 59 52
HFO 79 75 75 75 74 76 75 69 62 59 54
100 & 100A HP
LFG 75 69 69 75 76 73 71 65 63 59 50
LFO 79 68 73 78 78 75 79 76 63 59 54
HFG 78 69 70 77 77 74 74 69 63 59 50
HFO 81 68 70 77 78 78 77 71 64 59 57
125A HP
LFG 75 69 70 76 78 73 71 65 63 59 50
LFO 79 68 73 78 78 75 74 76 63 59 54
HFG 79 70 70 77 79 75 75 69 63 59 50
HFO 82 70 71 78 80 79 78 71 64 59 57
NOTES:
1. ABBREVIATIONS:
HF = High Fire
LF = Low Fire
O = Oil
G = Gas
2. Boiler HP followed by an “A” designates hot water boilers furnished in a smaller vessel size with additional tubes in the upper portion of
the vessel.
Table A2-22. Model CB Boiler Sound Pressure Level Details (50 - 125 hp)

40. A2-29
Firetube Boilers Model CB Boilers
07-02
FIRING
RATE
FUEL
SOUND
LEVEL
dBA
OCTAVE BAND SOUND PRESSURE LEVELS IN dB RE .0002 MICROBAR
31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz
125 HP
LFG 78 76 70 78 80 80 73 65 58 56 51
LFO 81 80 75 82 82 81 77 74 67 63 60
HFG 81 79 73 87 78 80 76 71 64 57 51
HFO 83 78 78 89 79 82 81 77 64 70 58
150 & 175A HP
LFG 77 75 70 78 76 77 72 67 63 58 55
LFO 82 76 68 80 78 79 75 71 66 60 58
HFG 80 71 72 82 76 80 76 71 64 58 52
HFO 83 70 71 83 79 82 77 73 65 60 55
200 HP
LFG 78 74 74 78 79 79 72 65 58 54 50
LFO 81 76 74 79 77 81 75 71 62 60 55
HFG 82 77 76 82 79 81 78 72 62 55 50
HFO 83 76 76 81 78 82 79 73 66 59 53
NOTES:
1. ABBREVIATIONS:
HF = HighFire
LF = Low Fire
O = Oil
G = Gas
2. Boiler HP followed by an “A” designates hot water boilers furnished in a smaller vessel size with additional tubes in the upper portion of the vessel.
Table A2-23. Model CB Boiler Sound Pressure Level Details (125 - 200 hp)
FIRING
RATE
FUEL
SOUND
LEVEL
dBA
OCTAVE BAND SOUND PRESSURE LEVELS IN dB RE .0002 MICROBAR
31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz
250 HP
LFG 81 72 81 85 84 82 75 68 60 56 53
LFO 86 76 87 87 85 84 82 73 70 76 68
HFG 84 78 85 84 84 84 79 72 62 55 50
HFO 88 79 84 84 84 85 86 74 68 67 65
300 HP
LFG 82 75 74 80 83 83 78 71 65 58 53
LFO 86 80 77 80 84 82 81 75 75 77 72
HFG 86 77 78 84 87 85 82 77 67 60 53
HFO 88 82 80 84 85 85 83 79 72 67 69
350 HP
LFG 83 75 78 87 86 83 78 70 58 55
LFO 85 82 79 84 84 84 84 70 66 66
HFG 86 78 79 87 85 84 84 72 65 61
HFO 89 82 82 85 85 86 86 79 68 68
NOTE:
ABREVIATIONS:
HF = High Fire
LF = Low Fire
O = Oil
G = Gas
Table A2-24. Model CB Boiler Sound Pressure Level Details (250 - 350 hp)

41. A2-30
Model CB Boilers Firetube Boilers
07-02
Sound Pressure
On large size boilers, the need for auxiliary equipment, and the
necessary interconnecting piping, make it impractical (and
sometimes impossible) to provide a boiler testing environment
that is suitable for obtaining the data needed to develop Sound
Pressure Power levels.
Typical Values
Sound pressure levels (dBA) for identical boilers will vary
between boiler rooms. In addition, variations will occur
between different people using different sound meters on the
same boiler. And finally, no two boilers can be expected to
give precisely the same sound levels. For these reasons, we can
only predict, but not guarantee, sound levels (dBA).
Octave Band
When predicting sound pressures in octave bands (e.g., dB at
125 Hz), even greater variations between boilers, between
sound meters, and between operators can be expected. These
larger variations in the low and high frequencies make octave
band levels a less reliable method of reporting than A-scale
sound levels. (Since A-scale sound levels are dominated by
mid-frequency sounds, the A-scale sound levels between two
boilers can be in reasonable agreement even though the low
and high frequencies of octave band measurement do not
closely correspond).
Gas-Fired Burners
NOTICE
A gas pressure regulator must be installed in the gas
piping to each boiler. Gas pressure regulators for
Model CB Firetube Boilers are sized and selected on
a job-by-job basis. Therefore, gas pressure require-
ments shown in Tables A2-26, A2-27, A2-28, A2-29,
and A2-30 list "regulated" gas pressure. Regulated
gas pressure is the pressure downstream of the gas
pressure regulator. Total gas pressure required for
the boiler equals regulated gas pressure plus the
pressure drop of the selected gas pressure regulator.
FIRING
RATE
FUEL
SOUND
LEVEL
dBA
OCTAVE BAND SOUND PRESSURE LEVELS IN dB RE .0002 MICROBAR
31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz 16kHz
400 HP
LFG 80 70 79 85 87 78 70 66 61 55 50
LFO 80 74 83 86 87 78 71 67 63 58 50
HFG 82 73 84 87 89 80 74 70 64 57 50
HFO 83 75 85 87 89 80 75 71 73 58 52
500 HP
LFG 81 78 83 87 87 78 73 66 62 58 54
LFO 82 77 83 87 87 81 75 70 63 59 55
HFG 82 79 87 87 84 79 76 70 63 57 55
HFO 83 77 87 87 84 81 77 71 62 58 55
600 HP
LFG 81 78 83 87 87 79 73 66 62 58 54
LFO 82 77 83 87 87 81 75 70 63 59 55
HFG 82 79 87 87 84 79 76 70 63 57 55
HFO 83 77 87 87 84 81 77 71 62 58 55
700 HP
LFG 82 80 87 91 87 80 75 70 66 62 56
LFO 82 79 88 90 87 81 76 72 67 63 57
HFG 85 80 90 89 89 82 77 76 66 64 57
HFO 85 81 90 91 89 82 80 77 68 65 57
750 HP
LFG 83 82 89 93 87 81 76 71 67 63
LFO 83 80 90 92 87 82 77 73 68 64
HFG 86 81 91 90 89 83 79 89 68 66
HFO 87 82 91 92 89 83 81 80 70 68
800 HP
LFG 84 83 90 94 87 82 77 73 68 64
LFO 84 82 91 93 87 82 78 74 68 65
HFG 87 82 92 91 89 83 81 82 70 68
HFO 88 83 92 92 89 83 82 83 71 70
NOTE:
ABBREVIATIONS:
HF = High Fire
LF = Low Fire
O = Oil
G = Gas
Table A2-25. Model CB Boiler Sound Pressure Level Details (400 - 800 hp)

42. A2-31
Firetube Boilers Model CB Boilers
07-02
Table A2-26 shows regulated gas pressure requirements for
Model CB Boilers with standard or FM gas trains.
Table A2-27 shows regulated gas pressure requirements for
Model CB Boilers with IRI gas trains.
Table A2-28 and A2-29 show regulated gas pressure with over
and undersized gas trains.
Table A2-30 shows minimum required gas pressure altitude
conversion.
Gas Pressure Regulator
The following items should be considered when selecting a
regulator:
• Pressure Rating: The regulator must have a pressure rating at
least equivalent to that of the gas distribution system.
• Capacity: The capacity can be determined by multiplying the
maximum burning rate (CFH) by 1.15, see TableA2-31. This
15 percent over-capacity rating of the regulator provides for
proper regulation.
• SpringAdjustment: The spring should be suitable for a range
of adjustment from 50 percent under the desired regulated
pressure to 50 percent over.
• Sharp Lock-Up: The regulator should include this feature to
prevent the downstream pressure (between the regulator and
the boiler) from climbing when there is no gas flow.
• Regulators in Parallel: This type of installation can be used
if the required gas volume is very large and if the pressure
drop must be kept to a minimum.
• Regulators in Series: This type of installation can be used if
the available gas pressure is over 5, 10, or 20 psig.
BOILER
HP
MODEL CB
CONN SIZE
(IN.)
NET REG’D
PRESS.
REQ'D
(IN. WC)
HTBB
MIN GAS
PRESS. REQ'D
15 1-1/4 3.5 -
20 1-1/4 6.0 -
25 - - -
30 2 7.0 -
40 2 7.5 -
50A 2 6.5 -
50 2 4.5 -
60 2 5.5 -
70 2 8.0 -
80 2 9.5 -
100A 2 8.5 -
100 2 9.5 -
125A 2-1/2 11.5 -
125 2-1/2 7.5 -
150 2-1/2 8.5 -
175A 2-1/2 11.5 -
200 2-1/2 15.5 -
250 3 17.5 22.0
300 3 23.0 31.0
350 3 32.5 42.5
400 4 16.5 21.0
500 4 25.5 35.0
600 4 36.0 41.5
700 4 50.0 57.5
750 4 57.0 66.0
800 4 64.0 75.5
NOTES:
1.These gas pressure requirements effective on all boiler shipped after July
1,1992 for 15 - 350 hp and Sept. 1, 1993 for 400 - 800 hp.
2. BHP followed by “A” designates hot water boilers furnished in a smaller
vessel size with additional tubes in the upper portion of the vessel.
3. For standard and FM gas pressure requirements for Canada, refer to
Table A2-27, IRI Trains.
A. Based on 1000 Btu/cu-ft natural gas and elevations up to 700 feet.
B. HTB is for high turndown (10:1) burners.
Table A2-26. Minimum Required Gas Pressure at Entrance
to Standard and FM GasTrains (Downstream of Gas
Pressure Regulator)
BOILER
HP
MODEL CB
CONN SIZE
(IN)
MIN PRESS
REQ'D
(IN WC)
HTBB
MIN GAS
PRESS. REQ’D
15 1-1/4 4.0 -
20 1-1/4 6.5 -
25 - - -
30 2 7.0 -
40 2 8.0 -
50A 2 7.5 -
50 2 5.5 -
60 2 6.5 -
70 2 9.0 -
80 2 10.5 -
100A 2 11.0 -
100 2 11.0 -
125A 2-1/2 11.5 -
125 2-1/2 7.5 -
150 2-1/2 9.5 -
175A 2-1/2 12.5 -
200 2-1/2 15.5 -
250 3 17.5 22.0
300 3 23.0 31.0
350 3 32.5 42.5
400 4 16.5 21.0
500 4 25.5 35.0
600 4 36.0 41.5
700 4 50.0 57.5
750 4 57.0 66.0
800 4 64.0 75.5
NOTES:
1.These gas pressure requirements effective on all boilers shipped after
July 1,1992 for 15 - 350 hp and Sept. 1, 1993 for 400 - 800 hp.
2. BHP followed by “A” designates hot water boiler furnished in a smaller
vessel size with additional tubes in the upper portion of the vessel.
3. Pressures shown also apply to standard and FM gas trains for Canada.
A. Based on 1000 Btu/cu-ft natural gas and elevation up to 700 feet.
B. HTB is for high turndown (10:1) burners.
Table A2-27. Minimum Gas Pressure at Entrance to Gas
Trains Equipped with Industrial Risk Insurers (IRI)
Requirements (Downstream of Gas Pressure Regulator)

43. A2-32
Model CB Boilers Firetube Boilers
07-02
Depending on the regulator characteristics, one regulator
would reduce the pressure to 2 to 3 psig, and a second
regulator would reduce the pressure to the burner
requirements.
• Regulator Location: A straight run of gas line piping should
be used on both sides of the regulator to ensure proper
regulator operation. This is particularly important when
pilot-operated regulators are used. The regulator can be
located close to the gas train connection, but 2 to 3 feet of
straight run piping should be used on the upstream side of
the regulator.
• When oxygen trim is used, the regulator selection must be
consistent with details shown in Section D.
• Gas pressure regulator selction for high turndown (10:1)
burners is critical at minimum flow rates. Contact your local
Cleaver-Brooks authorized representative for proper
selection.
Table A2-31 shows maximum gas consumption for natural gas
and propane vapor.
Figure A2-9 shows standard gas train sizes and locations for
Model CB Firetube Boilers.
Figure A2-10 shows typical gas train piping layouts for multi-
ple boiler applications.
Figure A2-11 shows gas train components.
50 60 70 80 100 100A 125A
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1-1/2 8.0 1-1/2 11.0 1-1/2 15.0 1-1/2 18.5 1-1/2 22.5 1-1/2 22.5 2 15.0
2 4.5 2 5.5 2 8.0 2 9.5 2 9.5 2 9.5 2-1/2 11.5
2-1/2 4.0 2-1/2 5.0 2-1/2 7.5 2-1/2 9.0 2-1/2 8.5 2-1/2 8.5 3 9.5
3 3.75 3 4.5 3 7.0 3 8.0 3 7.5 3 7.5
125 150 175A 200 250 300 350
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2 11.0 2 14.5 2 20.0 2 26.0 2-1/2 29.5 2-1/2 44.5 2-1/2 62.0
2-1/2 7.5 2-1/2 8.5 2-1/2 11.5 2-1/2 15.5 3 22.0 3 31.0 3 42.5
3 5.5 3 6.5 3 9.5 3 12.5 4 15.5 4 22.5 4 31.0
4 4.5 4 5.0 4 7.0 4 9.0 4A 13.5 4A 20.0 4A 27.5
400 500 600 700 750 800
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3 35.5 3 59.0 3 75.5 3 NA 3 NA 3 NA
4 21.0 4 35.0 4 41.5 4 57.5 4 66.0 4 75.5
4A 17.0 4A 27.5 4A 30.0 4A 42.0 4A 48.0 4A 55.1
NOTES:
1.Pipe size in inches, and pressure required in inches of WC.
2. Models followed by “A” designates hot water boilers furnished in a smaller vessel size with additional tubes in upper portion of vessel.
3. Pressure requirement is downstream of gas pressure regulator.
A. Low pressure drop Maxon valves (replaces 6" trains).
B. Standard gas train shown by shaded area.
C. Charts for 250 - 800 hp are for high turndown burners.
Table A2-28. Under and Oversized Standard and FM GasTrains, Model CB Boilers (50 - 800 hp)