Podcast
Questions and Answers
Pressure relief valves only need to be tested every 6 months.
Pressure relief valves only need to be tested every 6 months.
False
A try lever test determines if a pressure relief valve will open at its set pressure.
A try lever test determines if a pressure relief valve will open at its set pressure.
False
Try lever tests are performed every 2 months on steam heating boilers.
Try lever tests are performed every 2 months on steam heating boilers.
False
Pop tests are used to check the exact pressures at which the safety valve opens and closes.
Pop tests are used to check the exact pressures at which the safety valve opens and closes.
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Boilers do not need to be under pressure before conducting try lever tests.
Boilers do not need to be under pressure before conducting try lever tests.
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Steam heating boiler pressure must be 50 kPa or higher for try lever tests.
Steam heating boiler pressure must be 50 kPa or higher for try lever tests.
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A power boiler's pressure must be at least 50% of the setting of the safety valve for try lever tests.
A power boiler's pressure must be at least 50% of the setting of the safety valve for try lever tests.
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Pop tests are performed every 3 months.
Pop tests are performed every 3 months.
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The blowdown can be determined by comparing the opening and reseating pressures during a pop test.
The blowdown can be determined by comparing the opening and reseating pressures during a pop test.
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Try lever tests are only performed on steam heating boilers.
Try lever tests are only performed on steam heating boilers.
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Study Notes
Pressure Relief Valve Maintenance
- Pressure relief valves must be kept in good working condition at all times and tested regularly to ensure proper functioning.
Try Lever Test
- The try lever test determines if a pressure relief valve is operating freely, but not if it will open at its set pressure.
- The test is performed:
- Monthly on steam heating boilers
- Every three months for hot water heating boilers
- Every six months on power boilers operating below 2760 kPa
- Prior to pop tests and accumulation tests
- Boiler pressure must be:
- 35 kPa or higher for steam heating boilers
- At least 75% of the safety valve setting for power boilers
- The test procedure:
- Pull the try lever to the wide-open position
- Allow steam to discharge for 5-10 seconds
- Release the lever
- Allow the spring to snap the valve disc to the closed position
- If the valve simmers, operate the try lever 2-3 times to allow the disc to seat properly
Pop Test
- The pop test checks the full operation of the safety valve, including the exact pressures at which it opens and closes.
- The test procedure:
- Increase the boiler steam pressure to the safety valve set point
- Record the opening and reseating pressures accurately
- Compare the opening pressure and blowdown to the ASME BPVC performance tolerances
- The pop test should be performed annually, before taking a boiler off-line for maintenance.
- Defective valves can be identified and replaced or repaired prior to the boiler re-entering service.
Repair and Adjustment
- Repair or adjustment of pressure relief valves must be done by the valve manufacturer or its authorized repair representative.
- Consult the relevant ASME BPVC sections and the local Boiler Inspector to determine who is qualified to adjust or repair PRVs in a particular jurisdiction.
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Description
Learn about the importance of maintaining pressure relief valves in good working condition. This quiz covers regular testing methods to ensure proper valve function.
