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Questions and Answers
EASY What is the purpose of the pressure relief valve capacity for each boiler according to ASME BPVC Section I Part PG-67?
What should be done immediately if an overpressure event occurs?
Why is it important to determine the cause of the overpressure event?
What type of technician should assess the firing rate of the boiler?
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What can occur if a safety valve fails to open when boiler pressure reaches the set point?
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What is a potential cause of an overpressure event if the installed safety valve capacity is adequate?
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What is a consequence of a pressure vessel explosion?
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What should be performed on the boiler after an overpressure event?
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MEDIUM What is the maximum percentage above the maximum allowable working pressure that the boiler pressure can rise during an overpressure event?
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What is the purpose of the accumulation test?
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What type of explosion can occur if combustible gases accumulate in the furnace?
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What should be done to the boiler shell and other pressure components after an overpressure event?
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Why is a hydrostatic test recommended after an overpressure event?
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What is a potential consequence of a pressure vessel explosion?
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What should be serviced, reset, and recertified by an approved agency after an overpressure event?
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What is a possible cause of an overpressure event if the installed safety valve capacity is adequate?
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HARD What is the maximum allowable pressure rise during an overpressure event according to ASME BPVC Section I Part PG-67?
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What can cause a furnace explosion?
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What is the purpose of a hydrostatic test after an overpressure event?
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What should be done to the safety valves after an overpressure event?
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What can cause an overpressure event if the installed safety valve capacity is adequate?
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What is the purpose of an accumulation test?
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What can occur if combustible gases accumulate in the furnace?
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What should be inspected after an overpressure event?
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Study Notes
Overpressure Event
- Occurs when the safety valve fails to open or fails to stop the boiler pressure from rising excessively
- Results in boiler pressure rising more than 6% above the highest pressure at which any valve is set
Pressure Relief Valve Capacity
- Should be such that the valve(s) discharge all the steam that can be generated by the boiler
- Should not allow the pressure to rise more than 6% above the maximum allowable working pressure
Accumulation Test
- Performed to ensure the safety valve has adequate capacity
Response to Overpressure Event
- Shut down the boiler
- Isolate, cool, and drain it
- Inform the boiler inspector
- Determine the cause of the overpressure event before returning the boiler to service
- Perform a thorough internal and external inspection of the vessel
- Conduct a hydrostatic test to determine the integrity of the pressure vessel
- Remove, service, reset, and recertify the safety valves by an approved agency if deemed acceptable
Possible Causes of Overpressure Event
- Inadequate safety valve capacity
- Boiler being over-fired
- Determine the actual firing rate of the boiler and adjust firing conditions according to manufacturer specifications
Furnace and Pressure Vessel Explosions
- Furnace explosion: accumulation of combustible gases ignites and explodes within the furnace
- Pressure vessel explosion: pressure part of the boiler bursts due to excessive internal pressure or structural weakening
- Prompt reporting is required following a furnace or pressure vessel explosion
Reporting Requirements
- Report the explosion immediately to the Chief Inspector by telephone or telegraph
- Send a written report within 24 hours, including the exact place of the explosion, number of persons killed or injured, and any other required information
Overpressure Event
- Occurs when the safety valve fails to open or fails to stop the boiler pressure from rising excessively
- Results in boiler pressure rising more than 6% above the highest pressure at which any valve is set
Pressure Relief Valve Capacity
- Should be such that the valve(s) discharge all the steam that can be generated by the boiler
- Should not allow the pressure to rise more than 6% above the maximum allowable working pressure
Accumulation Test
- Performed to ensure the safety valve has adequate capacity
Response to Overpressure Event
- Shut down the boiler
- Isolate, cool, and drain it
- Inform the boiler inspector
- Determine the cause of the overpressure event before returning the boiler to service
- Perform a thorough internal and external inspection of the vessel
- Conduct a hydrostatic test to determine the integrity of the pressure vessel
- Remove, service, reset, and recertify the safety valves by an approved agency if deemed acceptable
Possible Causes of Overpressure Event
- Inadequate safety valve capacity
- Boiler being over-fired
- Determine the actual firing rate of the boiler and adjust firing conditions according to manufacturer specifications
Furnace and Pressure Vessel Explosions
- Furnace explosion: accumulation of combustible gases ignites and explodes within the furnace
- Pressure vessel explosion: pressure part of the boiler bursts due to excessive internal pressure or structural weakening
- Prompt reporting is required following a furnace or pressure vessel explosion
Reporting Requirements
- Report the explosion immediately to the Chief Inspector by telephone or telegraph
- Send a written report within 24 hours, including the exact place of the explosion, number of persons killed or injured, and any other required information
Overpressure Event
- Occurs when the safety valve fails to open or fails to stop the boiler pressure from rising excessively
- Results in boiler pressure rising more than 6% above the highest pressure at which any valve is set
Pressure Relief Valve Capacity
- Should be such that the valve(s) discharge all the steam that can be generated by the boiler
- Should not allow the pressure to rise more than 6% above the maximum allowable working pressure
Accumulation Test
- Performed to ensure the safety valve has adequate capacity
Response to Overpressure Event
- Shut down the boiler
- Isolate, cool, and drain it
- Inform the boiler inspector
- Determine the cause of the overpressure event before returning the boiler to service
- Perform a thorough internal and external inspection of the vessel
- Conduct a hydrostatic test to determine the integrity of the pressure vessel
- Remove, service, reset, and recertify the safety valves by an approved agency if deemed acceptable
Possible Causes of Overpressure Event
- Inadequate safety valve capacity
- Boiler being over-fired
- Determine the actual firing rate of the boiler and adjust firing conditions according to manufacturer specifications
Furnace and Pressure Vessel Explosions
- Furnace explosion: accumulation of combustible gases ignites and explodes within the furnace
- Pressure vessel explosion: pressure part of the boiler bursts due to excessive internal pressure or structural weakening
- Prompt reporting is required following a furnace or pressure vessel explosion
Reporting Requirements
- Report the explosion immediately to the Chief Inspector by telephone or telegraph
- Send a written report within 24 hours, including the exact place of the explosion, number of persons killed or injured, and any other required information
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Description
This quiz covers the principles and regulations of boiler safety, including overpressure events, pressure relief valve capacity, and accumulation tests.
