Operating Pressure Relief Valves
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Questions and Answers

According to ASME BPVC Section I, what is the main heading for PG-67 to PG-73?

  • Safety Relief Valves
  • Pressure Relief Valves
  • Code Calculations
  • Overpressure Protection Requirements (correct)
  • What is the term used in ASME BPVC Section I to replace the three separate terms before 2007?

  • Relief Valve
  • Safety Relief Valve
  • Safety Valve
  • Pressure Relief Valve (correct)
  • What is the definition of a safety valve according to the text?

  • An automatic pressure relieving device actuated by the static pressure upstream of the valve and used primarily for liquid service.
  • An automatic pressure relieving device actuated by the static pressure upstream of the valve and characterized by full-opening pop action. (correct)
  • An automatic pressure relieving device actuated by the static pressure upstream of the valve, which opens further with the increase in pressure over the opening pressure.
  • An automatic pressure-actuated relieving device suitable for use either as a safety valve or relief valve, depending on application.
  • According to PG-67.1, how many pressure relief valves are required for a boiler with more than 0.47 m2 of bare tube water-heating surface?

    <p>At least two</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-68.1, where should the pressure relief valves be located for an attached superheater?

    <p>Between the superheater outlet and the first stop valve</p> Signup and view all the answers

    According to the text, what is the main principle for boiler PRV design?

    <p>The relieving capacity must be sufficient to match steaming capacity.</p> Signup and view all the answers

    Based on the given information, how much steam must the PRVs on a stoker-fired firetube boiler be capable of discharging per hour if the boiler has 62 $m^2$ of heating surface?

    <p>2108 kg/h</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 $m^2$ of boiler heating surface and 85 $m^2$ of waterwall surface?

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

    According to Table A-44, a pulverized fuel-fired watertube boiler must have a PRV capacity of 49 kg/h for each square metre of boiler heating surface, plus 78 kg/h for each square metre of waterwall heating surface. What is the minimum required capacity for the boiler heating surface and waterwall heating surface combined?

    <p>10840 kg/h</p> Signup and view all the answers

    According to the solution, what is the capacity available in the superheater PRV?

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

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

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

    According to the solution, what is the minimum required relieving capacity for the steam drum PRVs?

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

    According to the note, are superheaters included in PRV capacity calculations?

    <p>Only if there are no intervening valves</p> Signup and view all the answers

    According to Appendix A-12, how is the maximum quantity of fuel that can be burned per hour determined?

    <p>By a test</p> Signup and view all the answers

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