69 Questions
EASY What is the primary objective of the furnace purge during the startup of a steam boiler?
To remove any combustible gases from the furnace
What is the recommended procedure for warming up a single boiler steam heating system according to ASME VI?
Warm up the boiler and steam lines simultaneously
What is the purpose of opening the boiler steam outlet valve prior to firing the boiler during a simultaneous warm-up?
To allow steam to flow into the header
What is the recommended resource for guidelines on starting, warming, and cutting in steam boilers?
All of the above
What is the primary concern when starting a steam boiler?
Preventing water hammer
In a single power boiler plant, what type of valve is typically used at the outlet of the boiler?
Gate valve
What is the term for the piping downstream of the header stop valve?
Steam header
What is the purpose of warming up the steam lines and headers before placing a boiler in service?
To prevent water hammer
What should be done with steam traps when the steam lines are warmed up?
Close bypasses and place steam traps in service
What should be done to the superheater drains or vents during boiler startup?
Keep them open until adequate flow of superheated steam is established
Why should the water column and gauge glass be blown down and tested?
To ensure the connections are clear and the level is correct
What should be done with the boiler until the operating control reaches its cut-out point?
Stay with the boiler until the operating control reaches its cut-out point
What is the purpose of the try lever and pop tests?
To check the safety valve for evidence of simmering
What is the primary purpose of a steam header in a steam system?
To supply all the plant equipment taking steam at a given pressure
Why is it important to warm the steam header with the boiler stop, header stop, and drain valves open?
To allow the steam piping to warm and pressurize at the same rate as the boiler
What happens to the steam entering the cold steam piping during warm-up?
It condenses heavily at first
What is the purpose of low point drains in a steam system?
To remove condensate from the steam piping
What is the recommended procedure for warming a steam boiler and its steam piping simultaneously?
Follow a site-specific procedure and manufacturer instructions
What is the purpose of opening the boiler drum vent during startup?
To release corrosive dissolved gases from the boiler water
Why is it important to raise the water temperature and pressure slowly during startup?
To prevent thermal shock and uneven expansion
What should be done with the drum vent valve when the boiler pressure reaches 15 to 20 kPa?
Close it
Why should the steam line low point drains be pinched back during startup?
To prevent excessive steam blowing
What should be done with the firing rate after the boiler has warmed up and is steaming?
Increase it slowly
MEDIUM What should be done with the steam traps when the steam lines are warmed up?
Put them in service
Why should the superheater drains or vents be kept open during boiler startup?
Until adequate flow of superheated steam is established
What should be done with the water column and gauge glass during boiler startup?
Blow them down to ensure connections are clear and level is correct
What should be done with the boiler during startup?
Stay with it until the operating control reaches its cut-out point
What is the purpose of performing the try lever and pop tests?
To ensure the safety valve is functioning properly
What is the primary purpose of the simultaneous warm-up procedure in a steam boiler?
To ensure the steam lines and headers are warm before the boiler is placed in service
According to ASME VII, how can a high-pressure steam plant comprised of a single power boiler be warmed up?
Either simultaneously or independently
What is the purpose of preparing the steam piping system before starting a steam boiler?
To ensure the steam lines are warm, dry, and ready to go on line when the boiler is ready
What is the name of the valve typically used at the outlet of a single power boiler?
Gate valve
Why is it important to warm up the steam lines and headers before placing a boiler in service?
To prevent water hammer
What is the term for the piping downstream of the header stop valve in a steam system?
Steam header
What resource is recommended for guidelines on starting, warming, and cutting in steam boilers?
ASME VI and ASME VII
What should be done with the steam lines during the warm-up period of a steam boiler?
Keep the steam lines warm, dry, and ready to go on line
What is the primary objective of warming up the steam header with the boiler stop, header stop, and drain valves open?
To allow for the condensate to form and be removed quickly
What is the purpose of opening the superheater vent during boiler preparation?
To ensure the superheater does not overheat due to lack of steam flow
What should be done with the low point drains during the simultaneous warm-up procedure?
They should be opened to release condensate as it forms
What is the recommended procedure for raising the water temperature and pressure during startup?
Raise the water temperature and pressure slowly to prevent thermal shock and uneven expansion
What should be done with the firing rate after the boiler has warmed up and is steaming?
It should be increased slowly when the boiler has thoroughly warmed up
Why is it important to inspect the boiler frequently during the warm-up period?
To observe the operation of the burner and check for leakage
What should be done with the boiler control switch after the boiler has reached its operating pressure?
It should be turned to the 'on' or 'start' position
What is the purpose of opening the main steam shutoff valve during the simultaneous warm-up procedure?
To supply steam to the steam piping system
Why is it important to close the drum vent valve when the boiler pressure reaches 15 to 20 kPa?
To ensure all the air has been expelled from the boiler
What should be done with the steam trap bypass lines during the simultaneous warm-up procedure?
They should be opened to allow for the release of condensate
What is the purpose of blowing down the water column and gauge glass during boiler startup?
To ensure the connections are clear and the level is correct
Why should the superheater drains or vents be kept open during boiler startup?
To allow for adequate flow of superheated steam
What should be done with the steam traps after the steam lines are warmed up?
Close the trap bypasses and place steam traps in service
Why is it important to stay with the boiler until the operating control reaches its cut-out point?
To shut off the burner at the set pressure
What is the purpose of performing the try lever and pop tests?
To test the safety valve
What is the primary purpose of ASME VI Recommended Rules for the Care and Operation of Heating Boilers?
To outline the procedures for starting, warming, and cutting in steam boilers
What is the primary advantage of simultaneous warm-up of a steam boiler and its steam piping system?
It reduces the risk of water hammer
What is the primary concern when warming up a steam piping system?
Ensuring the piping is warm, dry, and ready to go online
What is the purpose of the header stop valve in a steam system?
To isolate the boiler from the steam piping system
According to ASME VII, how can a high-pressure steam plant comprised of multiple power boilers be warmed up?
Simultaneously or independently, depending on the plant configuration
What is the primary purpose of preparing the steam piping system before starting a steam boiler?
To prevent water hammer and associated damage
What is the recommended procedure for warming up a steam boiler and its steam piping system according to ASME VI?
Open the boiler steam outlet valve prior to firing the boiler
What is the primary purpose of warming up the steam lines and headers before placing a boiler in service?
To prevent water hammer and associated damage
What is the primary purpose of opening the boiler drum vent during startup?
To allow the release of corrosive dissolved gases from the boiler water
What is the recommended procedure for raising the water temperature and pressure during startup?
Raising the temperature and pressure slowly to prevent thermal shock and uneven expansion
What is the purpose of the simultaneous warm-up procedure in a steam boiler?
To warm the steam header and piping simultaneously with the boiler
What should be done with the steam trap bypass lines during the simultaneous warm-up procedure?
They should be opened to allow steam to enter the trap
Why is it important to inspect the boiler frequently during the warm-up period?
To detect any leaks or defects in the boiler or piping system
What is the purpose of the low point drains in a steam system?
To remove condensate from the system during warm-up
What should be done with the firing rate after the boiler has warmed up and is steaming?
It should be increased slowly when the boiler has thoroughly warmed up and good water circulation has been established
What is the purpose of preparing the steam plant auxiliaries before startup?
To ensure that all necessary systems are functioning properly before startup
Why is it important to close the drum vent valve when the boiler pressure reaches 15 to 20 kPa?
To ensure that all air has been expelled from the boiler
What should be done with the boiler control switch after the boiler has reached its operating pressure?
It should be left in the 'on' position to maintain boiler operation
Study Notes
Safe Startup of a Steam Boiler
- Monitor all aspects of startup, including furnace purge, ignition, and main burner light off.
- Follow boiler manufacturer operating procedures and site-specific standard operating procedures.
Preparing Steam Piping System
- Warm up steam lines and headers before placing boilers in service to prevent water hammer.
- Consider how plant steam lines will be warmed up, then prepare the steam piping system to be warm, dry, and ready to go online.
Simultaneous Warm-Up
- Open boiler steam outlet valve prior to firing the boiler and keep it open during warm-up.
- Warm up steam header with boiler stop, header stop, and drain valves open.
- Condensate that forms will be removed by low point drains, steam traps, and steam trap bypass lines.
Independent Warm-Up
- Leave boiler stop valve closed until boiler reaches operating pressure.
- Open stop valve slowly and warm up header.
- Ensure trap bypasses, header drain valves, and other related drain valves are opened during this procedure.
Steam Boiler and Steam Piping Simultaneous Warm-Up Procedure
- Prepare steam plant auxiliaries, including boiler feed pump, condensate return system, and others.
- Check all steam system valves are correctly lined up.
- Open low point system drains to release condensate and open trap bypasses where they exist.
- Review manufacturer recommendations for burner and boiler startup.
- Open main steam shutoff valve and boiler drum vent.
- Ensure boiler control switch is in the “off” position and main disconnect switch is closed.
- Light pilot burner (if applicable) and open main test firing valve.
- Place boiler on low fire and turn boiler control switch to the “on” or “start” position.
- Raise water temperature and pressure slowly to prevent thermal shock and uneven expansion.
- Perform operating control and safety limit checks during warm-up.
- Inspect boiler frequently during warm-up and observe burner operation.
- Close drum vent valve when boiler pressure reaches 15 to 20 kPa.
- Close trap bypasses and place steam traps in service when steam lines are warmed up.
- Follow warm-up instructions of boiler manufacturer and site-specific procedures.
- Blow down water column and gauge glass to ensure connections are clear and level is correct.
- Test low water cut-offs by opening drains on water column and low water cut-off float cage.
- Stay with boiler until operating control reaches its cut-out point and shuts off burner at set pressure.
- Check safety valve for evidence of simmering and perform try lever and pop tests.
- Enter required information in the log book.
Safe Startup of a Steam Boiler
- Monitor all aspects of startup, including furnace purge, ignition, and main burner light off.
- Follow boiler manufacturer operating procedures and site-specific standard operating procedures.
Preparing Steam Piping System
- Warm up steam lines and headers before placing boilers in service to prevent water hammer.
- Consider how plant steam lines will be warmed up, then prepare the steam piping system to be warm, dry, and ready to go online.
Simultaneous Warm-Up
- Open boiler steam outlet valve prior to firing the boiler and keep it open during warm-up.
- Warm up steam header with boiler stop, header stop, and drain valves open.
- Condensate that forms will be removed by low point drains, steam traps, and steam trap bypass lines.
Independent Warm-Up
- Leave boiler stop valve closed until boiler reaches operating pressure.
- Open stop valve slowly and warm up header.
- Ensure trap bypasses, header drain valves, and other related drain valves are opened during this procedure.
Steam Boiler and Steam Piping Simultaneous Warm-Up Procedure
- Prepare steam plant auxiliaries, including boiler feed pump, condensate return system, and others.
- Check all steam system valves are correctly lined up.
- Open low point system drains to release condensate and open trap bypasses where they exist.
- Review manufacturer recommendations for burner and boiler startup.
- Open main steam shutoff valve and boiler drum vent.
- Ensure boiler control switch is in the “off” position and main disconnect switch is closed.
- Light pilot burner (if applicable) and open main test firing valve.
- Place boiler on low fire and turn boiler control switch to the “on” or “start” position.
- Raise water temperature and pressure slowly to prevent thermal shock and uneven expansion.
- Perform operating control and safety limit checks during warm-up.
- Inspect boiler frequently during warm-up and observe burner operation.
- Close drum vent valve when boiler pressure reaches 15 to 20 kPa.
- Close trap bypasses and place steam traps in service when steam lines are warmed up.
- Follow warm-up instructions of boiler manufacturer and site-specific procedures.
- Blow down water column and gauge glass to ensure connections are clear and level is correct.
- Test low water cut-offs by opening drains on water column and low water cut-off float cage.
- Stay with boiler until operating control reaches its cut-out point and shuts off burner at set pressure.
- Check safety valve for evidence of simmering and perform try lever and pop tests.
- Enter required information in the log book.
Safe Startup of a Steam Boiler
- Monitor all aspects of startup, including furnace purge, ignition, and main burner light off.
- Follow boiler manufacturer operating procedures and site-specific standard operating procedures.
Preparing Steam Piping System
- Warm up steam lines and headers before placing boilers in service to prevent water hammer.
- Consider how plant steam lines will be warmed up, then prepare the steam piping system to be warm, dry, and ready to go online.
Simultaneous Warm-Up
- Open boiler steam outlet valve prior to firing the boiler and keep it open during warm-up.
- Warm up steam header with boiler stop, header stop, and drain valves open.
- Condensate that forms will be removed by low point drains, steam traps, and steam trap bypass lines.
Independent Warm-Up
- Leave boiler stop valve closed until boiler reaches operating pressure.
- Open stop valve slowly and warm up header.
- Ensure trap bypasses, header drain valves, and other related drain valves are opened during this procedure.
Steam Boiler and Steam Piping Simultaneous Warm-Up Procedure
- Prepare steam plant auxiliaries, including boiler feed pump, condensate return system, and others.
- Check all steam system valves are correctly lined up.
- Open low point system drains to release condensate and open trap bypasses where they exist.
- Review manufacturer recommendations for burner and boiler startup.
- Open main steam shutoff valve and boiler drum vent.
- Ensure boiler control switch is in the “off” position and main disconnect switch is closed.
- Light pilot burner (if applicable) and open main test firing valve.
- Place boiler on low fire and turn boiler control switch to the “on” or “start” position.
- Raise water temperature and pressure slowly to prevent thermal shock and uneven expansion.
- Perform operating control and safety limit checks during warm-up.
- Inspect boiler frequently during warm-up and observe burner operation.
- Close drum vent valve when boiler pressure reaches 15 to 20 kPa.
- Close trap bypasses and place steam traps in service when steam lines are warmed up.
- Follow warm-up instructions of boiler manufacturer and site-specific procedures.
- Blow down water column and gauge glass to ensure connections are clear and level is correct.
- Test low water cut-offs by opening drains on water column and low water cut-off float cage.
- Stay with boiler until operating control reaches its cut-out point and shuts off burner at set pressure.
- Check safety valve for evidence of simmering and perform try lever and pop tests.
- Enter required information in the log book.
Learn the essential steps to safely start up a steam boiler, including furnace purge, ignition, and main burner light off. Understand the ignition sequence and importance of following manufacturer and site-specific procedures.
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