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?

  • Safety relief valves
  • Pressure relief valves
  • Temperature and pressure safety relief valves (correct)
  • Temperature relief valves

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

  • More than 1100 kPa
  • Exactly 1100 kPa
  • Less than 99 kPa
  • Less than 1100 kPa (correct)

    • According to ASME BPVC Section IV, Part HLW-800, how many officially rated temperature and pressure safety relief valves should each water heater have?

  • At least one (correct)
  • As many as needed
  • At least three
  • At least two

    • What is the purpose of using temperature and pressure safety relief valves in potable water heaters and hot water storage tanks?

    <p>To protect against explosion dangers associated with super-saturated hot water</p> Signup and view all the answers

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

    <p>ASME BPVC IV, Part HLW-800</p> Signup and view all the answers

    What type of water is used in the described potable water heaters and hot water storage tanks?

    <p>Cold potable water</p> Signup and view all the answers

    What is the purpose of a temperature and pressure relief valve in a hot water system?

    <p>To relieve excess pressure caused by thermal expansion and high water temperatures</p> Signup and view all the answers

    Where must safety relief valves be installed according to HLW-801?

    <p>With their spindles upright and vertical, with no horizontal connecting pipe</p> Signup and view all the answers

    What is the construction of the pressure-sensitive element in a temperature and pressure relief valve?

    <p>A nonadjustable compression spring holds a disc shut against a seat</p> Signup and view all the answers

    What type of temperature relief device uses the expansion and contraction of a rod and tube arrangement to open and close?

    <p>Another type that opens at 99°C and closes at 71°C</p> Signup and view all the answers

    Why might additional overpressure protection be required for relief devices sensitive only to temperature?

    <p>Because they are insufficient for vessel protection</p> Signup and view all the answers

    Where should safety relief valves be installed in relation to other components in the hot water supply system?

    <p>Based upon the component with the lowest maximum allowable working pressure rating</p> Signup and view all the answers

    What action does the temperature sensitive element in a T&P valve take when exposed to high temperature?

    <p>Expands against the force of the compression spring</p> Signup and view all the answers

    What type of safety relief valve is considered insufficient for vessel protection by ASME?

    <p>A safety relief valve sensitive to temperature only</p> Signup and view all the answers

    What does the combination temperature and pressure relief valve provide protection for?

    <p>Overpressurization and dangerously high water temperatures</p> Signup and view all the answers

    What is another type of temperature relief device that automatically recloses?

    <p>An expansion and contraction device opening at 99°C and closing at 71°C</p> Signup and view all the answers

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