Boiler Water Circulation Pumps
1 SCOPE
2 CHOICE OF TYPE AND NUMBER OF PUMPS
2.1 Need for Continuous Flow
2.2 Pump Reliability
3 CHOICE OF DRIVER
4 DUTY CALCULATIONS
5 CHOICE OF SEAL
5.1 Mechanical Seals
5.2 Soft-packed Glands
5.3 Construction Features
5.4 Guarding
6 CONSTRUCTION FEATURES
6.1 Vertical Glandless Wet-stator Motor Pumps
7 LAYOUT
7.1 Non-return Valves
7.2 Reducers at Pump Connections
7.3 Glandless Pumps for System Pressures
Exceeding 60 bar abs
7.4 Access round Glandless Pumps
7.5 Cooling Water Supply
8 RECOMMENDED LINE DIAGRAMS
8.1 Horizontal Pumps in Category 1
8.2 Vertical Wet-stator Motor Pumps in Category
APPENDICES
A PROPERTIES OF WATER AT THE SATURATION LINE
B ANNEX TO API 610, 6TH EDITION 1981:
VERTICAL GLANDLESS WET-STATOR MOTOR PUMPS
C ANNEX TO API 610, 6TH EDITION 1981:
HORIZONTAL BACK PULL-OUT PUMPS FOR BOILER
WATER CIRCULATION DUTY
FIGURES
3.1 NPSH CORRECTION FOR WATER
3.2 VELOCITY OF SOUND IN WATER AT 50 BAR
(NO BUBBLES)
3.3 VELOCITY OF SOUND IN WATER AT 50 BAR
(WITH 3% VAPOR CONTENT)
8.1 RECOMMENDED LINE DIAGRAM HORIZONTAL PUMPS - CATEGORY 1
8.2 RECOMMENDED LINE DIAGRAM HORIZONTAL PUMPS - SOFT PACKED GLAND INSTALLATION
8.3 RECOMMENDED LINE DIAGRAM HORIZONTAL PUMPS - MECHANICAL SEAL INSTALLATION
8.4 RECOMMENDED LINE DIAGRAM VERTICAL WET STATOR PUMPS - CATEGORY 2
BIBLIOGRAPHY
Boiler Water Circulation Pumps
1 SCOPE
2 CHOICE OF TYPE AND NUMBER OF PUMPS
2.1 Need for Continuous Flow
2.2 Pump Reliability
3 CHOICE OF DRIVER
4 DUTY CALCULATIONS
5 CHOICE OF SEAL
5.1 Mechanical Seals
5.2 Soft-packed Glands
5.3 Construction Features
5.4 Guarding
6 CONSTRUCTION FEATURES
6.1 Vertical Glandless Wet-stator Motor Pumps
7 LAYOUT
7.1 Non-return Valves
7.2 Reducers at Pump Connections
7.3 Glandless Pumps for System Pressures
Exceeding 60 bar abs
7.4 Access round Glandless Pumps
7.5 Cooling Water Supply
8 RECOMMENDED LINE DIAGRAMS
8.1 Horizontal Pumps in Category 1
8.2 Vertical Wet-stator Motor Pumps in Category
APPENDICES
A PROPERTIES OF WATER AT THE SATURATION LINE
B ANNEX TO API 610, 6TH EDITION 1981:
VERTICAL GLANDLESS WET-STATOR MOTOR PUMPS
C ANNEX TO API 610, 6TH EDITION 1981:
HORIZONTAL BACK PULL-OUT PUMPS FOR BOILER
WATER CIRCULATION DUTY
FIGURES
3.1 NPSH CORRECTION FOR WATER
3.2 VELOCITY OF SOUND IN WATER AT 50 BAR
(NO BUBBLES)
3.3 VELOCITY OF SOUND IN WATER AT 50 BAR
(WITH 3% VAPOR CONTENT)
8.1 RECOMMENDED LINE DIAGRAM HORIZONTAL PUMPS - CATEGORY 1
8.2 RECOMMENDED LINE DIAGRAM HORIZONTAL PUMPS - SOFT PACKED GLAND INSTALLATION
8.3 RECOMMENDED LINE DIAGRAM HORIZONTAL PUMPS - MECHANICAL SEAL INSTALLATION
8.4 RECOMMENDED LINE DIAGRAM VERTICAL WET STATOR PUMPS - CATEGORY 2
BIBLIOGRAPHY
The discussion on "Handling of Turbines During Emergencies" has been detailed in the ppt. Some case studies are also discussed in the session where the course participants express their difficulties while coming across the emergencies in handling the turbines at their locations.
Boiler recommissioning procedure after capital overhaul Manohar Tatwawadi
In a thermal power plant, boiler overhauling is generally done yearly. The presentation highlights the procedure for the re-commissioning of the boiler after capital overhaul.
Thermal Power Plant Simulator, Cold, warm and Hot rolling of Steam TurbineManohar Tatwawadi
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Turbine Stress Control Logic, Calculation & WorkingTahoor Alam Khan
Turbine Stress Control is one of the complex logics of BHEL turbine. This presentation clearly explains the Logic, working, calculations and influence of the same on operation of steam turbine. For further details and understanding, I can be reached on tahoorkhn03@gmail.com.
This slide expain on shrink and swell phenomena in Boiler operation. It also talk about three element control principle applied to mitigite these effect
The discussion on "Handling of Turbines During Emergencies" has been detailed in the ppt. Some case studies are also discussed in the session where the course participants express their difficulties while coming across the emergencies in handling the turbines at their locations.
Boiler recommissioning procedure after capital overhaul Manohar Tatwawadi
In a thermal power plant, boiler overhauling is generally done yearly. The presentation highlights the procedure for the re-commissioning of the boiler after capital overhaul.
Thermal Power Plant Simulator, Cold, warm and Hot rolling of Steam TurbineManohar Tatwawadi
The presentation describes the cold rolling, warm rolling and hot rolling and synchronising of steam turbine. The Temperature Matching Chart for Turbine metal and Steam is also discussed in the presentation
Turbine Stress Control Logic, Calculation & WorkingTahoor Alam Khan
Turbine Stress Control is one of the complex logics of BHEL turbine. This presentation clearly explains the Logic, working, calculations and influence of the same on operation of steam turbine. For further details and understanding, I can be reached on tahoorkhn03@gmail.com.
This slide expain on shrink and swell phenomena in Boiler operation. It also talk about three element control principle applied to mitigite these effect
Importance of three elements boiler drum level control and its installation i...ijics
Conversion of water into steam is the primary function of a utility boiler. The steam pressure is used to turn
a steam turbine thus, generating electricity. Within the boiler drum there exists a steam/water interface.
Boiler steam drum water level is one of the important parameters of power plant that must be measured
and controlled. For safe and efficient boiler operation, a constant level of water in the boiler drum is
required to be maintained. Too low water level may cause damage boiler tube by overheating. On the other
hand too high drum water level leads to improper function of separators, difficulty in temperature
controlling and damage in superheater tubes. Turbine may also be damaged by moisture or water
treatment chemicals carryover. The amount of water entering the boiler drum must be balanced with the
amounts of steam leaving to accomplish the constant water level in the drum. Therefore it is extremely
important to have the knowledge of the operating principles, installation requirements, strength and
weaknesses of drum water level control system. Ignoring these considerations can result in misapplication,
frequent maintenance, unsafe operation and poor instrument as well as system performance. In this paper
design aspects and installation requirements of boiler drum level control are discussed for safe and
economic operation.
The presentation is about the boiler drum's water level control, which is used on the ship for generating the steam. The presentation briefs about some controls used overboard to maintain the level inside the boiler for continuous steam supply.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
In this session you will learn:
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Elements of automatic control
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Modes of automatic control
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Basics of control systems
Open and Closed loop control systems
Elements of automatic control
Two position control system
Modes of automatic control
A coordinated mimo control design for a power plant using improved sliding mo...ISA Interchange
For the participation of the steam power plants in regulating the network frequency, boilers and turbines should be co-ordinately controlled in addition to the base load productions. Lack of coordinated control over boiler–turbine may lead to instability; oscillation in producing power and boiler parameters; reduction in the reliability of the unit; and inflicting thermodynamic tension on devices. This paper proposes a boiler–turbine coordinated multivariable control system based on improved sliding mode controller (ISMC). The system controls two main boiler–turbine parameters i.e., the turbine revolution and superheated steam pressure of the boiler output. For this purpose, a comprehensive model of the system including complete and exact description of the subsystems is extracted. The parameters of this model are determined according to our case study that is the 320 MW unit of Islam-Abad power plant in Isfahan/Iran. The ISMC method is simulated on the power plant and its performance is compared with the related real PI (proportional-integral) controllers which have been used in this unit. The simulation results show the capability of the proposed controller system in controlling local network frequency and superheated steam pressure in the presence of load variations and disturbances of boiler.
Effect of Different Defuzzification methods in a Fuzzy Based Liquid Flow cont...IJITCA Journal
Most of the process control technique is suffered by the complex dynamic systems with nonlinear or timevariable thats why it is very difficult to describe the behaviour of the system. One way to deal with the
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nonlinear dynamic processes, uses the reasoning of the human mind which is not always in the form of a
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using different defuzzification methods.Flow control system takes information about sensor output voltage,
control valve opening & flows rate as parameters and controls in case of overflowing & wastage.In this design two input parameters: sensor output voltage and rate of change voltage and one output parameters: opening of the control valve .
Effect of Different Defuzzification methods in a Fuzzy Based Liquid Flow cont...IJITCA Journal
Most of the process control technique is suffered by the complex dynamic systems with nonlinear or timevariable
thats why it is very difficult to describe the behaviour of the system. One way to deal with the
uncertainty of the behaviour of the system is to use fuzzy logic.If Fuzzy logic was modelled on spontaneous
human reasoning then it captures the impreciseness the most input data which are inherent. In a fuzzy logic
controller the focus is the human operator's behaviour, whereas in conventional PID controller what is
modeled is the system or process being controlled.FLC regulator has a very good result from complex
nonlinear dynamic processes, uses the reasoning of the human mind which is not always in the form of a
yes or no. In this work,it shows overall effective control and operation of the mechanical equipments
applied for control of liquid flow, implemented the fuzzy liquid flow algorithm and compared the effect of
using different defuzzification methods.Flow control system takes information about sensor output voltage,
control valve opening & flows rate as parameters and controls in case of overflowing & wastage.In this
design two input parameters: sensor output voltage and rate of change voltage and one output
parameters: opening of the control valve .
INTERIOR LIGHTING DESIGN A STUDENT'S GUIDEno suhaila
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The video is aimed at students taking introductory courses in interior design or lighting.
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Embracing GenAI - A Strategic ImperativePeter Windle
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Palestine last event orientationfvgnh .pptxRaedMohamed3
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
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students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
Boiler Feed Water Control
1. January/February 2011
Web Exclusive
Boiler feedwater control
Editorial note: Following the positive response InTech and author Jerry Gilman received when his “Boiler
drum level control” article ran in the magazine in 2010 (www.isa.org/intech/20100806), Gilman has
returned with a second boiler control contribution.
By G. F. (Jerry) Gilman
Some boilers utilize a reasonably steady load so only drum
level control from single element drum level measurement is
possible. Single element control is used on boilers during
startup or low load regardless of capacity or rapid load
swings. Single element control has often been unsatisfactory
because some of the newer boiler designs have minimum
water storage compared to the steaming rate of the boiler. A
majority of the larger sized units and those subject to rapidly
fluctuating loads require different methods of control. A two
element system controlling the feedwater control valve from
the steam flow signal and resetting the drum level signal is
able to handle some of the less difficult systems. Larger units
with small storage capacity related to throughput, and units experiencing severe, rapid load swings, usually
require three element control, whereby water flow is matched with steam flow and reset from the drum level
signal.
Single element feedwater level control
Single element drum level control measures drum level only. This is a simple feedback control loop (Figure 1).
The mass of the water flow and the steam flow must be regulated so mass water flow equals the mass steam
flow to maintain drum level. The feedwater control regulates the mass water flow to the boiler. The effects of
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2. the input control actions interact, since firing rate also affects steam temperature and feedwater flow affects
the steam pressure, which is the final arbiter of firing rate demand. The overall system must be applied and
coordinated in a manner to minimize the effects of these interactions. The interactions can be greatly affected
by the control system design. If the boiler operates under varying steam pressure, the calibration of the liquid
level transmitter will also vary with steam density.
When a single element control system is implemented, the level transmitter (LT) sends a signal to the level
controller (Figures 1 and 2). The process variable (input signal) to the controller is compared to the set point
(SP). Single element control is the minimum feedwater control system. When the system consists of single and
two or three element control, two controllers are required because the controller tuning is different.
The output signal is modified and adjusts the final control device. The diagram for a P&ID would typically be
in ISA symbols (Figure 2).The final control device can be a control valve, pump speed control, or a
combination of both. For simplicity, redundant transmitters are not shown on the P&ID drawings.
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3. Two element feedwater level control
The two element control scheme utilizes steam flow in addition to drum level. This is a simple feedback plus
feedforward control system (Figure 4) with a secondary variable that has a predictable relationship with the
manipulated variable. The secondary variable, steam flow, causes the manipulated variable to change the
primary variable. The steam flow adjusts the feedwater control valve based on steam flow signal and the drum
level controller signal. As the steam flow increases or decreases, the steam flow adjusts the output of the
summer and directly sets the feedwater final element. (See “Summer” section for further discussion.)
If the conditions are ideal, as in Figure 4, the feedwater flow would be equal to steam flow, and the level in
the drum would be maintained. If feedwater pressure is not constant, as seen in Figure 5, the changes in
pressure would affect feedwater control.
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4. Three element feedwater level control
Three element control utilizes steam and water flow in addition to drum level (Figure 7). This is a simple
feedback, feedforward, and cascade control loop. The steam flow adjusts the feedwater control valve based
on the steam flow signal and the drum level controller signal. As the steam flow increases or decreases, the
steam flow adjusts the output of the summer and directly sets the feedwater controller set point. By adding
feedwater flow, the measured variable is the feedback to the controller, therefore measuring what is being
controlled. Control is improved by adding mass flow compensation to drum level, steam flow, and water flow.
Three element feedwater adds the feedwater flow measurement to the control loop. The significant advantage
in adding a feedwater controller is the measurement of the controlled variable. By measuring the feedwater
flow and controlling it to a flow set point, the feedwater equals steam flow to maintain drum level over the
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5. boiler control range. The desired feedwater is maintained and overrides shrink and swell and variations in
feedwater header pressure (Figure 8).
Control system configuration
The drum level controller is configured to be either a reverse- or direct-acting controller. This depends on the
configuration of the final control device and the failsafe mode of the control valve. If the control valve fails
closed, the controller is configured to be a reverse-acting controller. If the control valve fails open, the
controller is configured to be a direct-acting controller. The final control element may be a control valve,
speed control, or a combination of both. Speed control is used to reduce line pressure drop and is also used in
combination with a control valve to establish greater turn down.
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6. Summer
A summer occurs when two or more values come into an equation and the output equals the sum of the inputs
in percent based on the K values. The functions are referred to as function blocks or algorithms. In Figures 4
and 7, the summer equation is used although the equation is not functioning as a summer. Some companies
use multiplication or division equations. The summer can be configured using a basic summer equation. The
equations used will vary with the control systems specified, including the number of inputs. The equation
below represents three inputs: a, b and c. Only two inputs are used in Figure 7. This is a common type of
equation that may have two or more inputs depending on the vendor algorithm/function block. A basic
equation performing the same function should be available with most control systems.
K (a) + K (b) + K (c) ± Bias = output
Considering two inputs to the summer, set both K values to 1. Set the bias to -50%. With the drum level
controller in manual mode and the drum level at the desired set point, set the controller output to 50%.
The 50% output is offset by the -50% bias in the summer equation. Therefore, the steam flow signal input to
the summer will equal the summer output. Considering a pound of steam equals a pound of water, the drum
level would be maintained during all load changes. Even though swell and shrink may occur on load swing,
the steam flow modifies the feedwater rate. The drum level controller becomes a trim controller adjusting the
output of the summer to control the level at the set point.
ABOUT THE AUTHOR
G. F. (Jerry) Gilman’s career has spanned more than 37 years with Procter & Gamble (P&G) and its
subsidiaries. A licensed professional engineer, Gilman provides training for ISA and consulting to utility
plants, industrial power plants and engineering contractors. Gilman is the developer of the “ISA Boiler
Control Systems Engineering” and “ISA Burner Management Systems Engineering” training courses.
RESOURCES
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7. ANSI/ISA-77.42 Fossil Fuel Power Plant Feedwater Control System – Drum-Type
http://www.isa.org/Template.cfm?Section=____&Template=/Ecommerce/ProductDisplay.cfm&
ProductID=2978
The Control of Boilers
http://www.isa.org/Template.cfm?Section=Find_Books1&Template=/Ecommerce
/ProductDisplay.cfm&ProductID=2770
Control Systems Engineering, 2nd Edition
www.isa.org/boilereng
Related Files
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