Temperature and Pressure Relief Valves for Potable Hot Water Heaters
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Questions and Answers

What type of safety relief valves are commonly used in potable water heaters and hot water storage tanks?

  • ASME BPVC Section IV safety relief valves
  • Pressure-only safety relief valves
  • Temperature and pressure safety relief valves (correct)
  • Temperature-only safety relief valves

    • What is the maximum allowable working pressure for the water heaters mentioned in the text?

  • 200°C
  • 1100 kPa (correct)
  • 2200 kPa
  • 99°C

    • Which standard is referred to in the text for safety relief valve requirements for industrial and commercial potable water heaters?

  • ASME BPVC Section IV, Part HLW-800.1
  • ASME BPVC I, Part HLW
  • ASME BPVC IV, Part HLW
  • ASME BPVC Section IV, Part HLW-800 (correct)

    • What must the pressure setting of the safety relief valve be in relation to the maximum allowable working pressure of the water heater?

    <p>Less than or equal to</p> Signup and view all the answers

    What additional dangers do temperature and pressure safety relief valves protect against?

    <p>Explosion dangers associated with super-saturated hot water</p> Signup and view all the answers

    What type of potable water is used in the heaters mentioned in the text?

    <p>Cold potable water supplied to produce hot potable water</p> Signup and view all the answers

    What does ASME consider insufficient for vessel protection according to the text?

    <p>Temperature-sensitive devices</p> Signup and view all the answers

    What causes the pressure element of the temperature and pressure relief valve to open?

    <p>Thermal expansion of water during low hot water consumption</p> Signup and view all the answers

    What does the temperature sensitive element of the temperature and pressure relief valve consist of?

    <p>A wax-filled thermostatic sensor probe</p> Signup and view all the answers

    What is recommended for T&P valves to receive annually according to the text?

    <p>Try lever tests</p> Signup and view all the answers

    Which type of temperature relief device employs a fusible element that allows hot water to escape when it melts at 99°C?

    <p>Fusible element device</p> Signup and view all the answers

    What does the temperature-sensitive device do when it opens at 99°C?

    <p>Allows hot water to escape until replaced</p> Signup and view all the answers

    According to HLW-801, where must the pressure relief valves be installed?

    <p>Directly to specific openings or fittings</p> Signup and view all the answers

    What is the condition for installing the valve in the horizontal position with the outlet pointed down?

    <p>$100$ mm of interconnecting piping</p> Signup and view all the answers

    "The combination temperature and pressure relief valve provides protection for both overpressurization, and dangerously high water temperatures" - what does this statement mean?

    <p>&quot;The combination temperature and pressure relief valve provides protection against both overpressurization, and dangerously high water temperatures&quot;</p> Signup and view all the answers

    The pressure setting for the relief valve(s) should be based on the component with the highest maximum allowable working pressure rating.

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

    Safety relief valves must be connected to an internal pipe in the water heater or a cold water feed line connected to the water heater.

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

    ASME prohibits the installation of relief devices sensitive only to temperature.

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

    The T&P valve operates with a pop action when over-pressurization occurs.

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

    Temperature relief devices must always have additional pressure relief.

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

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