Operating Pressure Relief Valves
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Questions and Answers

Which of the following is the formula to calculate the minimum combined relieving capacity for the steam drum PRVs?

  • Capacity = (70 m2 x 49 kg/h-m2) - (95 m2 x 78 kg/h-m2)
  • Capacity = (70 m2 x 49 kg/h) - (95 m2 x 78 kg/h)
  • Capacity = (70 m2 x 49 kg/h-m2) + (95 m2 x 78 kg/h-m2) (correct)
  • Capacity = (70 m2 x 49 kg/h) + (95 m2 x 78 kg/h)

    • What is the minimum combined relieving capacity required for the steam drum PRVs?

  • 10840 kg/h
  • 7410 kg/h
  • 9840 kg/h (correct)
  • 1000 kg/h

    • According to PG-68.2, how much of the total required capacity should the pressure relief valves on the boiler have?

  • At least 50%
  • At least 100%
  • At least 75% (correct)
  • At least 90%

    • What is the capacity available in the superheater PRV?

    <p>1000 kg/h</p> Signup and view all the answers

    What is the formula to calculate the minimum capacity required in the steam drum PRVs?

    <p>Capacity required = Capacity available in superheater PRV - Capacity for boiler heating surface - Capacity for waterwall heating surface</p> Signup and view all the answers

    What is the minimum required relieving capacity for the steam drum PRVs?

    <p>9840 kg/h</p> Signup and view all the answers

    Are superheaters included in PRV capacity calculations?

    <p>Yes, if there are no intervening valves between the superheater PRV and the boiler</p> Signup and view all the answers

    What is the maximum quantity of fuel that can be burned per hour at the time of maximum forcing?

    <p>CxHxO.75</p> Signup and view all the answers

    What does the formula CxHxO.75 represent?

    <p>The maximum quantity of fuel that can be burned per hour at the time of maximum forcing</p> Signup and view all the answers

    What does a basic understanding of boiler design help the Power Engineer understand?

    <p>Why specific materials are chosen, how failures occur, and which root causes of failures can be mitigated</p> Signup and view all the answers

    Which term in the ASME BPVC Section I refers to an automatic pressure relieving device actuated by the static pressure upstream of the valve and characterized by full-opening pop action?

    <p>Safety valve</p> Signup and view all the answers

    What is the main heading for PG-67 to PG-73 in ASME BPVC Section I?

    <p>Overpressure Protection Requirements</p> Signup and view all the answers

    What does the term 'pressure relief valve' replace in the ASME BPVC Section I?

    <p>Safety valve, relief valve, and safety relief valve</p> Signup and view all the answers

    According to PG-67.1, how many pressure relief valves are required for a boiler with 0.47 m^2 of bare tube water-heating surface?

    <p>At least one</p> Signup and view all the answers

    According to PG-67.2, what is the maximum allowable pressure rise for a boiler when the pressure relief valve discharges all the steam that can be generated?

    <p>6%</p> Signup and view all the answers

    According to PG-68.4, what is the minimum total relieving capacity required for a reheater?

    <p>Equal to the maximum steam flow</p> Signup and view all the answers

    According to the text, the minimum required relieving capacity of the pressure relief valves for all types of boilers shall be based on the capacity of all the fuel burning equipment as limited by other boiler functions. True or False?

    <p>True</p> Signup and view all the answers

    What is the minimum required relieving capacity for all the PRVs on a gas-fired watertube boiler with 65 m2 of boiler heating surface and 85 m2 of waterwall surface?

    <p>9815 kg/h</p> Signup and view all the answers

    What is the minimum required capacity of a pressure relief valve for a stoker-fired firetube boiler with 62 m2 of heating surface?

    <p>2108 kg/h</p> Signup and view all the answers

    According to Table A-44, what is the PRV capacity required for each square meter of boiler heating surface in a pulverized fuel-fired watertube boiler?

    <p>49 kg/h-m2</p> Signup and view all the answers

    What is the minimum combined relieving capacity required for the steam drum PRVs in this example?

    <p>9,840 kg/h</p> Signup and view all the answers

    According to PG-68.2, how much of the total required capacity should the pressure relief valves on the boiler (not including the superheater PRVs) have?

    <p>75%</p> Signup and view all the answers

    What is the capacity available in the superheater PRV in this example?

    <p>1,000 kg/h</p> Signup and view all the answers

    What is the minimum required relieving capacity for the steam drum PRVs in this example?

    <p>9,840 kg/h</p> Signup and view all the answers

    Are superheaters included in PRV capacity calculations?

    <p>Yes</p> Signup and view all the answers

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