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Weiber offers heating ovens, industrial ovens and curing ovens for a wide range of applications including drying, baking, curing, preheating, stress relieving, annealing & sintering.
Five-zone split tube furnace with separated temperature control unit and max working temperature of 1100oC. It is an excellent furnace for annealing, diffusing and sintering sample in various atmospheres.
The Large Capacity Bench Oven is designed to handle a wide variety of applications, which require
temperature of 400°F (204°C) with a ±0.5% control accuracy and ±8°F (4°C) uniformity for efficient drying of
large samples.
700 Series Cooking Equipment is designed with modern styling not just for the attractive appearance, but to be functional and easy to use. The main objective of this Series is to be: flexible, modular and hygienic. All built-in high quality AISI 304 Stainless Steel creating ideal work conditions for all Chefs working in modern kitchens.
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We are engaged in Designing, Manufacturing, Supplying & Exporting a variety of Industrial Heaters. We offer high degree of performance and technology to our clients which is used to defines our product.
Flexible Jacket Type Drum Heaters
Our insulated drum heating jackets can be used for frost protection, temperature maintenance and heat up of drums containing sugars,oils, surfactants, fats (animal & vegetable), foodstuffs and chemicals.
Application
Foodstuffs
Automotive
Fats
Convection batch ovens are designed to produce equilibrium temperature in the convection zone not far above the parts target temperature. These are extensively used in variety of applications such as baking, curing, drying, finishing, melting, pre heating and many more. For More Information Please Logon http://goo.gl/HXIvUS
MR Equipment an extensive array of commercial kitchen equipment,commercial refrigerator and restaurant equipment supplies ranging from restaurant small wares to heavy-duty equipment. MR Equipment main products are: cooking equipment, refrigeration products, food preparation machinery, bakery equipment, working table & shelves, restaurant furniture and small wares. In one word, you can find all the things you need for your new restaurant or renovation.
Besides, our trained staff is always ready to offer you:
Epcon Industrial Systems specializes in the custom designing and manufacturing of Regenerative Thermal Oxidizers (RTOs), Recuperative Thermal Oxidizers, Catalytic Oxidizers, Direct Fired Oxidizers, Industrial Furnaces, Industrial Ovens and Specialty and Finishing Systems.
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Our returning customers are a testament to our success in providing innovative solutions around the globe.
Visit us for more information https://epconlp.com.
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Reformer Burner Types/Design
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Brochure from Schiedel. This forms part of our flue and chimney range and can be used with acknowledgement to Schiedel Chimney Systems Ltd. as well as a link to the original source at www.schiedel.com/uk
Schiedel's chimney flue range includes flue systems for residential and commercial applications. A typical flue installation includes steel chimney pipe or mineral pipe or module components from the heat source appliance (a stove, biomass or gas appliance for example) to it's termination point above the roof. Support is required for internal and external chimney systems.
Schiedel specialise in wood burning appliances and flues, which are a renewable way of avoiding constant gas or electricity usage when looking at a secondary heat source. Even heat pumps are problematic with severe temperature drops, so a secondary source is always needed.
Therma-Tek Range Corporation may appear to be a new company in the market, but our tradition and combined experience spans more than 100 years. The owners are seasoned professionals in the design, development, manufacture and sale of commercial foodservice equipment. After selling and re-capitalizing their prior company; which was another well known and established manufacturer of residential and commercial cooking equipment, the owners decided to continue their tradition of success in manufacturing the highest quality foodservice cooking equipment with the formation of Therma-Tek Range Corporation. Our products carry this experience behind them, which sets them far ahead of our competition. The company represents quality, strength and performance, backed by unparalleled warranty and continued service. We carry a reputation in the marketplace for developing and delivering quality, value conscious, innovative products in a timely manner. We continuously emphasize research and development, as well as cutting edge product development, with a close understanding of market trends and needs.
HY Industry aluminum louvers are the perfect unity of aesthetic and functionality. Among many aluminum louvers manufacturers, HY sticks to the principle of getting same quality products in lower price. So we are willing to provide aluminum window louvers with good appearance in competitive price. Our external aluminum louvers allow for the flow of air, while can still inhibit the entry of unwanted elements like strong sunlight, raindrop, dirt, etc.. Compared with traditional plastic window louvers, aluminum louvers are totally maintenance free. And it is more durable too. Nowadays, despite of sun-shade function, it works more and more as a decoration. The perfect silver aluminum color makes home look more luxury. You can fine aluminum sunscreen louvers and aluminum trafficable louvers available here in different shape, type and finishes.
Rotary kilns are a significant investment in any processing operation, requiring precise engineering around process and product goals. Finding a rotary kiln manufacturer that can design and fabricate a custom, quality solution can be difficult. This presentation provides a guide on some of the factors to consider when choosing a rotary kiln manufacturer for your processing application.
Scandia Manufacturing’s next generation modular steam rooms (called hybrid steam rooms) are a highly efficient substitute to the traditional tile steam room. Compared to tile rooms, the Scandia Hybrid rooms require less maintenance and less energy to operate.
We are engaged in Designing, Manufacturing, Supplying & Exporting a variety of Industrial Heaters. We offer high degree of performance and technology to our clients which is used to defines our product.
Flexible Jacket Type Drum Heaters
Our insulated drum heating jackets can be used for frost protection, temperature maintenance and heat up of drums containing sugars,oils, surfactants, fats (animal & vegetable), foodstuffs and chemicals.
Application
Foodstuffs
Automotive
Fats
Convection batch ovens are designed to produce equilibrium temperature in the convection zone not far above the parts target temperature. These are extensively used in variety of applications such as baking, curing, drying, finishing, melting, pre heating and many more. For More Information Please Logon http://goo.gl/HXIvUS
MR Equipment an extensive array of commercial kitchen equipment,commercial refrigerator and restaurant equipment supplies ranging from restaurant small wares to heavy-duty equipment. MR Equipment main products are: cooking equipment, refrigeration products, food preparation machinery, bakery equipment, working table & shelves, restaurant furniture and small wares. In one word, you can find all the things you need for your new restaurant or renovation.
Besides, our trained staff is always ready to offer you:
Epcon Industrial Systems specializes in the custom designing and manufacturing of Regenerative Thermal Oxidizers (RTOs), Recuperative Thermal Oxidizers, Catalytic Oxidizers, Direct Fired Oxidizers, Industrial Furnaces, Industrial Ovens and Specialty and Finishing Systems.
Epcon has been engineering and manufacturing state-of-the art Thermal Oxidizers since 1977.
Our returning customers are a testament to our success in providing innovative solutions around the globe.
Visit us for more information https://epconlp.com.
Rotational Moulding - Future Technology, is it here now?Ian Hansen
A review of future technologies that are here now. Prof. Roy Crawford Crawford highlighted in 2004 Internal Temperature, Internal Pressure + Internal Cooling.What rotational moulding (molding) technology are you using now?
Burner Design, Operation and Maintenance on Ammonia PlantsGerard B. Hawkins
Burner Design, Operation and Maintenance on Ammonia Plants
Brief History
Reformer Burner Types/Design
Types of Reformers
Combustion Characteristics
Excess Air/Heater Efficiency
Maintenance, Good Practice
Low Nox Equipment
Summary
Brochure from Schiedel. This forms part of our flue and chimney range and can be used with acknowledgement to Schiedel Chimney Systems Ltd. as well as a link to the original source at www.schiedel.com/uk
Schiedel's chimney flue range includes flue systems for residential and commercial applications. A typical flue installation includes steel chimney pipe or mineral pipe or module components from the heat source appliance (a stove, biomass or gas appliance for example) to it's termination point above the roof. Support is required for internal and external chimney systems.
Schiedel specialise in wood burning appliances and flues, which are a renewable way of avoiding constant gas or electricity usage when looking at a secondary heat source. Even heat pumps are problematic with severe temperature drops, so a secondary source is always needed.
Epcon is One of the World's leading Manufacturing Companies. Epcon designs and manufactures thermal oxidizers, industrial ovens and furnaces, air pollution control systems, and specialty finishing systems for industry. Visit Us https://epconlp.com/
ABOUT US
KERONE now renowned name in serving specialized need of customers with best quality and economical process Heating /cooling and drying products, manufactured in high quality environment by well trained and qualified workforce(special purpose machineries) .
The journey started in 1976 as a small and simple proprietorship firm which was setup to serve the companies of different vertical with heating solution and contribute towards growth of nations. In the year of 1990, KERONE has changed the traditional way of operations and diversified in to High end technical heating and drying system for the specialized need of industries across the world with strategic collaboration and technical know-how with the world’s prominent consultants and industry leaders.
KERONE is pioneer in application and implementation engineering with its vast experience and team of professionals. KERONE is devoted to serve the industry to optimize their operations both economically and environmentally with its specialized heating and drying solutions.
Welcome to our comprehensive guide on industrial steam cleaners and the essential features they possess. In today’s fast-paced industrial environments, efficiency and effectiveness are crucial. Industrial steam cleaners offer a powerful solution to meet these demands, and one particular feature that sets them apart is their quick heat-up time. In the following slides, we will delve into the significance of the industrial steam cleaner quick heat-up time and explore the various aspects that make it an essential factor in choosing the right equipment for your cleaning needs.
Discover the essential role of industrial ovens and furnaces in manufacturing processes, from their definition and purpose to their key features and safety considerations. View more https://epconlp.com/products/process-heating-equipment/industrial-ovens/
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OVEN 101 – The Basics of Specifying Industrial Ovens
1. The difference in your design
www.savage-engineered.com|keith@savage-engineered.com
570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
OVEN 101 – The basics of specifying industrial ovens.
GENERAL
Industrial ovens are required in a wide range of applications. Most manufacturing processes require
some form of heat process. These processes include the following:
Aging
Annealing
Curing
Drying
Hardening
Heat Treating
Powder Coating
Sintering
Solvent Venting
Sterilization
Stress Relief
Tempering
These processes are done throughout industries. Some of the more common industries are:
Aerospace
Automotive
Defense Contractors
Electronics
Metal Work
Mining and Drilling
Painting
Pharmaceutical
Plastics
Industrial heat processing requirements are divided into two categories: oven and furnace. An oven
operates in a range of temperatures from ambient to 1250°Fahrenheit. A furnace operates above
1250°Fahrenheit. As the temperature increases, different characteristics change with the oven design.
2. The difference in your design
www.savage-engineered.com|keith@savage-engineered.com
570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
TYPES
There are several classifications of ovens that have developed over the course of the past 100 years.
a. Bench Oven
This oven is generally designed for an industrial setting with heavy duty components. It is named
due to its location on a work bench in a factory. Therefore, it is small in scope. This classification
usually stops when the unit gets to be 27 cubic feet of interior space.
b. Lab Oven
This oven is generally used in a laboratory setting. Therefore, it has slightly different
requirements than a bench oven, but is similar in size. Lab ovens usually are not designed to be
handled roughly and are more like office equipment in terms of durability. Many have features
that would be beneficial to research, including stainless steel interior chambers to prevent
corrosion from unknown materials, variable exhausts, programmable controllers, and other
components that can easily be modified to suit the unique application.
3. The difference in your design
www.savage-engineered.com|keith@savage-engineered.com
570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
c. Cabinet Oven
This industrial oven can range from 15 cubic feet to over 100 cubic feet of work space. The name
comes from the fact that the unit is loaded from the front, like a cabinet. The floor is usually fully
insulated. Many times the side walls have shelf slides to accept loading shelves.
d. Truck Oven (also called Truck-In or Walk-In)
This is the most common industrial oven and offers a great deal of flexibility. It is designed to be
loaded with a cart (truck). The truck is loaded with product outside the oven and rolled into the
chamber for processing. The floor of the oven may be equipped with recessed tracks on an
insulated floor with the tracks matching the wheel spacing on the truck. Or the oven may have a
full plate floor to allow the truck to be wheeled into place without obstructions.
4. The difference in your design
www.savage-engineered.com|keith@savage-engineered.com
570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
e. Conveyor Oven
This oven type is usually the most complex in its design. It is used in a full factory setting and,
many times, is coupled with automated processes feeding the unit or taking parts from the unit.
f. Top Load Oven
This oven operates with the top of the oven on a hinge to allow crane loading.
5. The difference in your design
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570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
g. Vertical Lift Ovens
Often used in raw material hardening, sintering or other similar operations, the oven itself is on a
vertical lift hoist. The entire oven is raised up; the product is put in place, and the oven is lowered
over the product to begin the process. It is used with very heavy loads
h. Sterilizers
Used in medical and pharmaceutical fields. sterilizers offer a full clean room application in which
the oven is used to kill the pyrogens on glassware.
i. Granulation Dryers
Used in pharmaceutical manufacturing for drying of powdered materials, granulation dryers can
be used with flammable and non-flammable solvents. (This type of oven is becoming more rare
in its application as other technologies, such as fluid bed dryers, have become more prevalent
and are easier to integrate into a production line.)
SPECIFYING A NEW OVEN
a. PROCESS
When thinking about an oven design, process is the most important section to consider. If the
oven is not designed for the specific process being developed, it may never meet the needs of
the user.
The process considerations begin with the orientation of the product being processed.
6. The difference in your design
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570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
What is trying to be accomplished?
Are the parts oriented in a manner that airflow will not reach all pieces?
How large is the batch or individual piece?
What is the piece rate?
How long must the part be at temperature?
What tolerance do the parts have for temperature variance?
The more information gathered about the process will provide for a better design. Some specific
questions about the process are listed below in more detail.
i. Drying
Many applications require that a material is dried. (Whether there is a non-flammable
solvent, oil, or water present, or maybe the upstream process imparted solvents on the
parts that now need to be baked out before they can move further in the process.)
Regardless of what is being dried, the oven will need to be designed to suit. For
example, the exhaust will need be sized to handle the material being dried off.
The main questions for this application are as follows:
1. What product is being dried off?
2. How much of this product will be loaded into the oven?
3. What time frame is required to complete the drying operation?
NOTE: Should the material being dried be a flammable solvent, the unit will
need to be rated to meet NFPA86 Guidelines for Solvent Venting Ovens.
Compliance with this guideline includes the following items added to the oven:
a. Powered exhaust – solvent capacity for the exhaust capacity will be
labeled on the face of the unit. The process cannot exceed this stated
level of solvents.
b. Purge Cycle – The control system shall include a purge timer to ensure
that after the process heat has been turned on, the exhaust must make
the necessary air exchanges inside the oven before engaging the
heaters. This prevents any latent solvent build-up from causing an
explosion when the heat is engaged.
c. Non-Sparking Fans – The circulation and exhaust fans will be required to
be non-sparking. This normally means that the fan housing or slinger
ring is of a different material than the fan blades.
d. Pressure Relief Panel – A panel must be sized on the oven that will
account for an unexpected relief of pressure inside the oven (explosion).
This panel will prevent the unit from becoming a bomb. The location of
this panel can be specific to a particular plant (depending on safety
considerations). However, the most common application is to have the
7. The difference in your design
www.savage-engineered.com|keith@savage-engineered.com
570-329-6500
Savage Engineered Equipment, Inc.
PO Box 3162
Williamsport, PA 17701
570-329-6500
main oven doors be pressure relief and they are held together by
restraining chains to prevent them from opening fully. This will usually
send the pressure wave upward.
ii. Inert Atmosphere
This is another unique requirement to a specific process. This is often used when
processing a raw material into a designed component. If the material is subject to
oxidation and a certain temperature, the process must be completed in an inert
atmosphere (nitrogen or argon are the most common gases used). This will require
special gasketing, automated valves, purge cycles, and special controls.
b. TEMPERATURE CHARACTERISTICS
Unless there is a process need to cause this information to change, the construction will be as
follows:
i. UP TO 450ºF
Interior – aluminized steel (a steel coated with an aluminum-iron alloy
coating; prepared by dip-coating and diffusing aluminum into steel)
Insulation thickness – 3” walls and ceiling, 3” floor (if applicable)
450ºF – silicone P Gasket
ii. UP TO 650ºF
Interior – aluminized steel
Insulation thickness – 4.5” walls and ceiling, 3” floor (if applicable)
650 ºF – stainless steel core wrapped with ceramic core
iii. UP TO 800ºF
Interior – aluminized steel
Exterior – face will be painted high temperature black to prevent burn off
when the door is opened.
Insulation thickness – 6” walls and ceiling, 3” floor (if applicable)
Stainless steel core wrapped with ceramic core
iv. UP TO 1000ºF
Interior – 304 stainless steel (aluminized steel will lose its coating at about
850 ºF)
Exterior – face will be painted high temperature black to prevent burn off
when the door is opened.
Insulation thickness – 8” walls and ceiling, 3” floor (if applicable)
Ceramic cloth with stainless steel mesh core gasket
v. UP TO 1250ºF
Interior – 304 stainless steel
Exterior – face will be painted high temperature black to prevent burn off
when the door is opened.
Insulation thickness – 8” walls and ceiling, 3” floor (if applicable)
Ceramic cloth with stainless steel mesh core gasket
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NOTE: A mechanical convection oven may still be used up to 1400ºF.
However, the air becomes very thin to recirculate. This would be evaluated
on a case-by-case basis. If this design is to be carried out, the change would
require a type 309 stainless steel interior.
c. AIRFLOW
The airflow for a process is critical to the proper heat transfer to the parts in production.
Depending on the layout, any of the following orientations may be effective in best transferring
heat. As it stands, there is no set guideline. Effective engineering understanding of the parts and
how they are loaded will allow the user to make the best choice.
i. Horizontal
The air moving equipment and heating elements are in a plenum on top of the unit. Air
pressurizes one side wall, flows across the heat chamber, to a negative pressure wall on
the opposite side, then to the ceiling plenum for reheating and recirculation.
Front View
ii. Vertical
The air moving equipment and heating elements are in a plenum on top of the unit. Air
enters the chamber near the bottom of each side wall, flows up through the product to the
ceiling panel, where it then passes over the heaters and fan to be recirculated.
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Front View
iii. Horizontal / Vertical
The air moving equipment and heating elements are in a plenum on top of the unit. Air
enters the chamber across the whole wall on each side of the chamber, flows up through
the product to the ceiling panel, where it then passes over the heaters and fan to be
recirculated.
FRONT VIEW
iv. Compound Horizontal
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The air moving equipment and heating elements are in the rear of the unit. Air enters the
chamber each side wall either over the full height and depth of the wall or only near the
front (depending on configuration of the load), flows back through the chamber to the
back wall, where it then passes over the heaters and fan to be recirculated.
PLAN VIEW
d. TEMPERATURE UNIFORMITY
Many times a customer’s process will require minimal tolerance for differences in temperature
throughout the chamber. This is called temperature uniformity. Typically, it is specified as a ±xºF
at a temperature setpoint of XXXºF. Normally, the temperature uniformity of ±5ºF at 450ºF is
attainable with very little engineering work.
A temperature uniformity specification will normally create a requirement for the factory to perform
testing on the unit prior to shipping to make sure that the specification is met. This causes an
increase in price to accommodate the labor to perform the testing.
The specification that is least expensive to perform and test is a nine point test within an 80%
cube of the interior space with the chamber empty.
Other types of specification:
The same test with empty shelves / trucks in the oven
A twelve point test (or more points
A test with the product in place
e. AIR VELOCITY
To maintain temperature uniformity in the chamber, an air velocity is required to 150-200 feet per
minute. This will translate to the recirculation air volume being calculated using that air velocity
and the square footage of the pressurized feed wall.
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f. AIR ADJUSTMENT
The standard inlet and exhaust wall will be configured with adjustable louvers. The louvers are
pre-punched “C” shaped holes in the walls. The “C” shape allows them to be pushed to full open,
left full closed, or somewhere in between. This adjustment allows the unit to be tuned for airflow
to move more or less to different parts of the chamber.
g. GENERAL PLENUM / AIR CONFIGURATION
All oven units will be have a negative side heat input in the plenum. The heating system shall be
on the negative side of the fan, thus drawing air across the heater, spun through the fan, and then
on to the pressure wall for distribution to the chamber. This ensures that the heated air is
properly mixed so there is even heat in the pressurized air.
h. HEAT INPUT
There are generally three types of heat inputs.
i. Electrical Resistance
Least expensive capital investment
Normally most expensive per cycle to operate
High Full Load Amperage Loads for oven system requires adequate facilities
ii. Flammable Gas (Natural Gas or Propane)
High capital cost
Low operating cost
Can be fired directly (gas flame is in the plenum with open flame) – imparts
product of combustion to the process.
Can be indirect fired (gas flame is in heat exchanger tube) – Less efficient, more
expensive, but keeps product of combustion out of the process
iii. Steam
Mid range capital cost
Only viable for lower temperatures
Requires significant facility systems (Steam Line, Condensate Drain)
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i. FACILITY REQUIREMENTS
i. ELECTRICALLY HEATED OVENS
The main facility requirement associated with an electrically heated oven will be the
electrical line coming into the unit. Many times the amperage rating for the oven will be
very high in relation to similar equipment on the plant floor. Many times, the oven must
be designed around the incoming power capacity. The total Full Load Amps (FLA) will
include the heat input, motors (all motors, including all circulation motors and exhaust),
and control circuit. Once the FLA has been determined, add a 20% safety factor to
determine the recommended breaker size.
AMPERAGE CALCULATIONS FOR ELECTRIC OVENS
o HEAT INPUT
SINGLE PHASE POWER
𝑤𝑎𝑡𝑡𝑠 𝑜𝑓 ℎ𝑒𝑎𝑡 𝑖𝑛𝑝𝑢𝑡 ⁄ 𝑣𝑜𝑙𝑡𝑎𝑔𝑒 = 𝑎𝑚𝑝𝑒𝑟𝑎𝑔𝑒
THREE PHASE POWER
𝑎𝑚𝑝𝑒𝑟𝑎𝑔𝑒 𝑓𝑜𝑟 𝑠𝑖𝑛𝑔𝑙𝑒 𝑝ℎ𝑎𝑠𝑒 ⁄ 1.73 (𝑐𝑜𝑟𝑟𝑒𝑐𝑡𝑖𝑜𝑛 𝑓𝑎𝑐𝑡𝑜𝑟) = 3 𝑝ℎ𝑎𝑠𝑒 𝑎𝑚𝑝𝑒𝑟𝑎𝑔𝑒
o MOTOR INPUT
AC Single Phase Motors
Horse-
power
115v 200v 208v 230v
Amperes
1/6 4.4 2.5 2.4 2.2
1/4 5.8 3.3 3.2 2.9
1/3 7.2 4.1 4.0 3.6
1/2 9.8 5.6 5.4 4.9
3/4 13.8 7.9 7.6 6.9
1 16 9.2 8.8 8.0
1-1/2 20 11.5 11 10
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2 24 13.8 13.2 12
3 34 19.6 18.7 17
5 56 32.2 30.8 28
7-1/2 80 46 44 40
10 100 57.5 55 50
AC 3 Phase
Horse-
power
115V 200V 208V 230V 460V 575V
Amperes
1/2 4.4 2.5 2.4 2.2 1.1 0.9
3/4 6.4 3.7 3.5 3.2 1.6 1.3
1 8.4 4.8 4.6 4.2 2.1 1.7
1-1/2 12.0 6.9 6.6 6.0 3.0 2.4
2 13.6 7.8 7.5 6.8 3.4 2.7
3 -- 11.0 10.6 9.6 4.8 3.9
5 -- 17.5 16.7 15.2 7.6 6.1
7-1/2 -- 25.3 24.2 22 11 9
10 -- 32.2 30.8 28 14 11
15 -- 48.3 46.2 42 21 17
20 -- 62.1 59.4 54 27 22
25 -- 78.2 74.8 68 34 27
30 -- 92 88 80 40 32
40 -- 120 114 104 52 41
o CONTROL CIRCUIT INPUT
The control circuit can apply an additional 5 to 10 amps to the total full
load amps.
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ii. GAS HEATED OVENS
Natural gas or propane heated ovens will provide a lower power requirement. The main
concern with natural gas heated units are the gas train design. Different insurance
groups require different components in the train. The customer must specify whether the
design is to match an IRI train or a FM train.
iii. INSTALLATION OBSTACLES
An industrial oven can be much larger than a customer will expect. The interior chamber
dimensions are normally much smaller than the overall dimensions required. The plenum
space, insulation thickness, control panel size, and motor overhang can significantly add
to the overall dimensions of any unit. Normally, the oven will be shipped fully assembled
on a skid. This will also add to the overall dimension that must traverse the facility.
The installation path from the receiving dock to the final installed location must be
determined. Any pinch points for turns, doorways, and all ceiling heights should be
measured to determine any restriction on the size of the unit. If necessary, the oven can
be shipped on its side, with a control panel removed, or motors removed, or with a
modular construction technique. Once the restriction has been determined, the most
economical way to work around the obstruction will be determined.
j. INSTRUMENTATION
i. CONTROL
1. SINGLE SETPOINT CONTROLLER
The single set point controller is the base oven controller. It takes a temperature
input and sends a signal to the heating system. If the input is below the set point
the unit will call for heat. It will continue to call for heat until the set point
temperature has been reached. Once at temperature, the controller will monitor
the chamber temperature and call for heat as the temperature falls.
Depending on the controller selected, the unit will have settings to determine
temperature overshoot at the set point or proportional output to smooth out the
chamber temperature curve for the whole process.
2. PROGRAMMABLE TEMPERATURE CONTROLLER
A programmable temperature sensor will operate in a similar fashion a single set
point controller. However, the programmable controller will allow for a
temperature versus time graph for the process. It can control “RAMP” cycles by
allowing for a set increase or decrease in temperature during a set time frame
(e.g. 3 degrees per minute). It can also control the amount of time the process
stays at a certain temperature “SOAK.”
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ii. HIGH LIMIT THERMOSTAT
Each oven must be provided with an independent high limit thermostat for safety. The
thermostat has its own temperature input, It is set at a point above the maximum set
point of the unit. Should there be an issue with the main controller and the oven reaches
the high limit set point, the heating source will be shut down. This protects the equipment
and the users.
iii. HEAT CONTROL
The oven heat control will be performed with no mechanical contacts, ensuring safer
operation and making for better temperature control. The control will be performed with
solid state relays or silicone controlled rectifiers.
A solid state relay (SSR) is an electronic switching device in which a small
control signal controls a larger load current or voltage. It comprises a voltage or
current sensor which responds to an appropriate input (control signal), a solid-
state electronic switching device of some kind which switches power to the load
circuitry either on or off, and some coupling mechanism to enable the control
signal to activate this switch without mechanical parts.
A silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four-
layer solid state device that controls current.
iv. SWITCHES
The oven at a minimum should have a switch to engage the circulation system and a
separate switch to engage the heating system. The number and functions of the
switched is often determined by the process and there is a great deal of flexibility in the
design.
v. DIFFERENTIAL PRESSURE SWITCHES
As a safety measure, the circulation fan(s) must be equipped with a differential pressure
switch with the differential inputs set up across the positive and negative side of the fan.
This switch will keep the heating system engaged while there is proper differential
pressure. Should the switch see a loss of pressure, meaning the fan is not circulating air,
the heating system will disengage.
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vi. TEMPERATURE SENSING
Normally, the temperature sensor for the oven will be done in the pressure wall near the
chamber. Normally, a thermocouple will be located during the testing operation of the
unit to provide accurate control of the chamber temperature. The thermocouple is
calibrated with the instrument controlling the system. Many different types of
thermocouples are used for different applications. A list of thermocouples is shown
below. In addition, other sensing devices, such as RTD’s can be used to signal the
controller.
Thermocouple
Type
Names of Materials
Useful Application
Range
E
Chromel (+)
Constantan (-)
200-1650F
J
Iron (+)
Constantan (-)
200-1400F
K
Chromel (+)
Alumel (-)
200-2300F
N
Nicrosil (+)
Nisil (-)
1200-2300F
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T
Copper (+)
Constantan (-)
-330-660F
vii. DOOR SWITCH
This simple mechanical switch can be mounted on the unit to sense whether the door is
opened or closed. The most common application is turn the heat off when the door is
opened. The state of any system (circulation or exhaust) can also be changed when the
door is opened.
viii. RECORDING
As a means of quality control, some ovens are equipped with a temperature recorder.
The recorder will track the chamber temperature over the course of the process and log it
for future reference. The recorder may be as simple as a single pen on a circular chart or
may be as complicated as a 20 channel recorder tied to a computer system. Each
recorded point will typically have an independent temperature sensor.
ix. AMP METERS
On some occasions, the monitoring of the amperage draw of the electrical heating
elements may be required. An amp meter across each leg of the three phase power will
continually indicate the power being pulled through the circuit. Should one of the legs
begin pulling a lesser amount of current, one of the heating elements may have burned
out.
k. SPECIAL CHARACTERISTICS
i. EXPLOSION RESISTANCE
An oven may be running the process in an environment that is rated to be explosion
proof. This will require several differences in design that will cause a significant increase
in cost. All electrical connections will be need to be made in an explosion resistant
junction box, all motors will need to be rated XP, and the control panel typically will be in
another room outside the rated environment. Should the control panel be mounted in the
rated room, a purged box will be required. The purged box will provide a positive
pressure to the control panel eliminated the possibility that any flammable material can
be drawn into the control panel.
CLASS
Class Definition
Class I
Are those in which flammable gases or vapors are or may be present in the
air in quantities sufficient to produce explosive or ignitable mixtures.
Class II Are those which are hazardous due to the presence of combustible dust.
Class III
Are those which are hazardous due to the presence of easily ignitable fibers
or flyings, but in which such fibers or flyings are not likely to be in suspension
in the air in quantities to produce ignitable mixtures.
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DIVISON
Division I
Locations in which hazardous concentrations in the air exist continuously,
intermittently, or periodically under normal operating conditions.
Division II
Locations in which hazardous concentrations are handled, processed, or
used but are normally within closed containers or closed systems from which
they can escape only in case of accidental rupture or breakdown.
GROUP (CLASS I)
Group A Atmospheres containing acetylene.
Group B
Atmospheres containing hydrogen, or gases (or vapors) of equivalent
hazard, such as manufactured gas.
Group C Atmospheres containing ethyl-ether vapors, ethylene or cyclo propane.
Group D
Atmospheres containing gasoline, hexane, naptha, benzine, butane, alcohol,
acetone, benzol, lacquer solvent vapors, or natural gas.
GROUP (CLASS II)
Group E
Atmospheres containing metal dust, including aluminum, magnesium and
their commercial alloys and other metals of similarly hazardous
characteristics.
Group F Atmospheres containing carbon black, coal, or coke dust.
Group G Atmospheres containing flour, starch, or grain dust.
i. COOLING
Process requirements or production speed may facilitate the need for a process to have a
cooling cycle. This can be accomplished in several different ways.
a. Exhaust Fan
The simplest form of cooling would be to initiate a higher exhaust rate after the
heating cycle has ended. This is accomplished with a powered exhaust turning
on. Or if a low exhaust rate is required during the heat cycle, a second damper
position for cooling can be used and the controller will switch the damper
position.
This solution will cool as quickly as physics will allow with no means for control.
b. Exhaust Damper
A way to introduce cooling from the controller is with a motorized damper. The
damper can be controlled on the percentage opened by the controller to try and
control the cool down rate. This will not provide accurate control, but can be
used to bring the temperature down in a controlled manner.
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c. Cooling Gas Injection
A third way to bring the temperature down is with an injection of a cooling gas
(e.g. nitrogen). The injection is intiated with an on/off solenoid valve or a
modulating valve that will control a percentage of input through the valve. The
modulating valve can be used to control a rate of reduction in temperature.
d. Cooling Coil
The most effective way to maintain a temperature ramp at any point in the
process. A chilled water coil mounted in the plenum can circulate cooling
water with a modulating valve controlled by the controller. This coupled with
heat control can actively maintain the temperature required by the process.