4BE3.5 U3 C1 Obj 3 Matching

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Questions and Answers

Match the following types of tests with their frequency:

Try Lever Test = Monthly on steam heating boilers, every three months for hot water heating boilers, and every six months on power boilers Pop Test = Annually, before taking a boiler off-line for maintenance Accumulation Test = Not mentioned in the context Boiler Test = Not mentioned in the context

Match the following tests with their objectives:

Try Lever Test = To determine if a pressure relief valve is operating freely Pop Test = To check the full operation of the safety valve, including the exact pressures at which it opens and closes Accumulation Test = Not mentioned in the context Boiler Test = Not mentioned in the context

Match the following boiler types with their pressure requirements for try lever tests:

Steam Heating Boiler = Pressure must be 35 kPa or higher Power Boiler = Pressure must be at least 75% of the setting of the safety valve Hot Water Heating Boiler = Not mentioned in the context High Pressure Boiler = Not mentioned in the context

Match the following procedures with their steps:

<p>Try Lever Test = Pull the try lever, allow steam to discharge, release the lever, and allow the spring to snap the valve disc to the closed position Pop Test = Increase the boiler steam pressure to the safety valve set point, record the opening and reseating pressures, and determine if the valve is operating properly Accumulation Test = Not mentioned in the context Boiler Test = Not mentioned in the context</p> Signup and view all the answers

Match the following valve conditions with their required actions:

<p>Valve simmers after the try lever test = Operate the try lever two or three times to allow the disc to seat properly Valve continues to simmer after operating the try lever = Repair or replace the valve Valve operates properly = No action required Valve fails to open = Not mentioned in the context</p> Signup and view all the answers

Match the following test results with their implications:

<p>Valve opens at the set pressure during the pop test = The valve is operating properly Valve does not open at the set pressure during the pop test = The valve requires repair or replacement Valve operates freely during the try lever test = The valve is operating freely, but not necessarily at the set pressure Valve does not operate freely during the try lever test = The valve requires repair or replacement</p> Signup and view all the answers

Match the following codes with their relevant sections:

<p>ASME BPVC = Section I or IV, for performance tolerances of safety valves ASME BPV = Not mentioned in the context Boiler Code = Not mentioned in the context Safety Valve Code = Not mentioned in the context</p> Signup and view all the answers

Match the following tests with their purposes:

<p>Try Lever Test = To determine if a pressure relief valve is operating freely Pop Test = To check the full operation of the safety valve, including the exact pressures at which it opens and closes Accumulation Test = Not mentioned in the context Blowdown Test = To determine the blowdown of the safety valve</p> Signup and view all the answers

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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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