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Questions and Answers
High limit temperature controls:
High limit temperature controls:
- shut off the fuel if the water temperature is too high (correct)
- increase air-flow to the boiler if temperature limits are exceeded
- are required on steam boilers
- are required under Section II of the ASME Codes
The fitting attached between a high-pressure steam boiler and the pressure steam gauges consists of the following:
The fitting attached between a high-pressure steam boiler and the pressure steam gauges consists of the following:
- check valve, steam trap, and steam separator
- steam accumulator, water trap, and steam purifier
- drain valve, level indicator, and moisture separator
- test connection, syphon, and isolation valve (correct)
One of the possible causes for a safety relief valve to weep is:
One of the possible causes for a safety relief valve to weep is:
- too many safety valves are in service
- the expansion tank is half full
- too much air in the system
- that it has damaged seating surfaces (correct)
A leveling indicator is found on a/an:
A leveling indicator is found on a/an:
Automatically fired boilers will restart when:
Automatically fired boilers will restart when:
Operating controls on heating boilers control:
Operating controls on heating boilers control:
A gauge glass shows a clear liquid as being very dark is the _____ gauge glass:
A gauge glass shows a clear liquid as being very dark is the _____ gauge glass:
Boiler programming controls:
Boiler programming controls:
Hot water boilers have stop valves in their inlet and outlet piping:
Hot water boilers have stop valves in their inlet and outlet piping:
A pressure or altitude gauge for a hot water boiler:
A pressure or altitude gauge for a hot water boiler:
T & P Relief valve provides protection for:
T & P Relief valve provides protection for:
The temperature indicator of a hot water boiler should indicate water temperature:
The temperature indicator of a hot water boiler should indicate water temperature:
Modulating burner controls operate by regulating:
Modulating burner controls operate by regulating:
The infrared scanner should be mounted in such a way that its temperature will not exceed:
The infrared scanner should be mounted in such a way that its temperature will not exceed:
Burner Management Systems:
Burner Management Systems:
If the pressure relief valve continues to discharge after the try lever test:
If the pressure relief valve continues to discharge after the try lever test:
The purpose of the stop valve in the boiler feedwater piping is to:
The purpose of the stop valve in the boiler feedwater piping is to:
To ensure consistent operation and proper valve disc seating, safety valves fit with:
To ensure consistent operation and proper valve disc seating, safety valves fit with:
All boilers having a fixed water level must have at least:
All boilers having a fixed water level must have at least:
If, for any reason, the burner should go out during normal operation:
If, for any reason, the burner should go out during normal operation:
The purpose of a low water fuel cut-off is to shut of the:
The purpose of a low water fuel cut-off is to shut of the:
A float operated boiler level control:
A float operated boiler level control:
A blowdown ring on a safety valve is use to:
A blowdown ring on a safety valve is use to:
For hot water boilers operating up to 400 kPa, the higher safety relief valve setting must not exceed the MAWP by:
For hot water boilers operating up to 400 kPa, the higher safety relief valve setting must not exceed the MAWP by:
If a power boiler has 60 m² of heating surface, it must have _____ safety valves:
If a power boiler has 60 m² of heating surface, it must have _____ safety valves:
To correct pressure cycling due to the narrow cut-in and cut-out set points of a on-off control steam heating boiler:
To correct pressure cycling due to the narrow cut-in and cut-out set points of a on-off control steam heating boiler:
A damper positioning switch used on boilers with a high-low fire control has three positions:
A damper positioning switch used on boilers with a high-low fire control has three positions:
Combustion air of burners provided with a mechanical draft must be equipped with a device to _____ the airflow rate and purge duration:
Combustion air of burners provided with a mechanical draft must be equipped with a device to _____ the airflow rate and purge duration:
Flashcards
High limit temperature controls
High limit temperature controls
If temperature limits are exceeded, high limit temperature controls shut off the fuel to prevent overheating.
Safety relief valve weeping cause?
Safety relief valve weeping cause?
A safety relief valve weeps due to damaged surfaces on the valve seating, preventing a tight seal.
Leveling Indicator Location
Leveling Indicator Location
A leveling indicator is found on Two-Position Mercury pressure controls
Automatic boiler restart condition
Automatic boiler restart condition
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Heating boiler controls
Heating boiler controls
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Dark liquid in gauge glass
Dark liquid in gauge glass
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Boiler programming controls
Boiler programming controls
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Hot water boiler stop valves use
Hot water boiler stop valves use
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Pressure gauge syphon usage
Pressure gauge syphon usage
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T&P Relief valve protection
T&P Relief valve protection
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Hot water boiler temperature indicator location
Hot water boiler temperature indicator location
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Modulating burner controls regulation
Modulating burner controls regulation
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Infrared scanner temperature limit
Infrared scanner temperature limit
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Burner Management Systems function
Burner Management Systems function
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Pressure Relief Valve Discharging Action
Pressure Relief Valve Discharging Action
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Study Notes
- High limit temperature controls should shut off the fuel if the water temperature is too high.
- The fitting attached between a high-pressure steam boiler and the pressure steam gauges consists of a test connection, syphon, and isolation valve.
- One possible cause for a safety relief valve to weep is that it has damaged seating surfaces.
- A leveling indicator is found on Two-Position Mercury pressure controls.
- Automatically fired boilers will restart when the water level has been re-established.
- Operating controls on heating boilers control the firing of the boiler.
- A gauge glass that shows a clear liquid as being very dark signifies a reflex gauge glass.
- Boiler programming controls are interconnected with the Low Water Cutoff.
- Hot water boilers have stop valves in their inlet and outlet piping so that the boiler can be drained without draining the system.
- A pressure or altitude gauge for a hot water boiler does not require a syphon.
- A T & P Relief valve provides protection for both overpressure and high water temperature.
- The temperature indicator of a hot water boiler should indicate water temperature at the boiler outlet.
- Modulating burner controls operate by regulating fuel flow and air flow.
- The infrared scanner should be mounted in such a way that its temperature will not exceed 50°C.
- Burner Management Systems connects the fuel train components with other burner safety controls to organize the boiler safety system.
- If the pressure relief valve continues to discharge after the try lever test, operate the try lever 2 or 3 times to clear the valve disc.
- The purpose of the stop valve in the boiler feedwater piping is to isolate the boiler from the feedwater line for maintenance and repair.
- To ensure consistent operation and proper valve disc seating, safety valves fit with top & bottom guides.
- All boilers having a fixed water level must have at least one gage glass.
- If, for any reason, the burner should go out during normal operation, the fuel to the burner should be shut off immediately.
- The purpose of a low water fuel cut-off is to shut off the fuel supply when the water level gets too low.
- A float operated boiler level control is often used on small boilers.
- A blowdown ring on a safety valve is used to adjust the blowdown differential by varying the size of the huddling chamber.
- For hot water boilers operating up to 400 kPa, the higher safety relief valve setting must not exceed the MAWP by 40 kPa.
- If a power boiler has 60 m² of heating surface, it must have at least two safety valves.
- To correct pressure cycling due to the narrow cut-in and cut-out set points of a on-off control steam heating boiler, adjust the differential adjustment screw on the control.
- A damper positioning switch used on boilers with a high-low fire control has three positions: automatic, high, and low.
- To ensure consistent operation and proper valve disc seating, safety valves fit with top & bottom guides.
- Combustion air of burners provided with a mechanical draft must be equipped with a device to prove the airflow rate and purge duration.
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