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?

  • Pressure-only safety relief valves
  • ASME BPVC IV Part HLW-800 specified relief valves
  • Temperature and pressure safety relief valves (correct)
  • Temperature-only safety relief valves

    • What is the maximum allowable working pressure for the potable water heaters and hot water storage tanks?

  • 800 kPa
  • 1100 kPa (correct)
  • 99°C
  • 120°C

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

  • None
  • At least one (correct)
  • At least three
  • At least two

    • What are the operating temperatures not exceeding for the potable water heaters and hot water storage tanks?

    <p>99°C</p> Signup and view all the answers

    What does ASME BPVC IV, Part HLW refer to?

    <p>Safety relief valve requirements for industrial and commercial potable water heaters</p> Signup and view all the answers

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

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

    What is the purpose of the combination temperature and pressure relief valve?

    <p>To relieve excess pressure caused by thermal expansion and to discharge overheated water</p> Signup and view all the answers

    According to HLW-801, how should the safety relief valves be installed?

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

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

    <p>Opens to relieve excess pressure caused by thermal expansion</p> Signup and view all the answers

    What type of temperature relief device melts at 99°C and allows hot water to escape without reseating?

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

    Why are safety relief valves required to be installed with their spindles upright and vertical?

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

    What is the purpose of additional overpressure protection when temperature relief devices sensitive only to temperature are installed?

    <p>To provide protection in case of overpressurization</p> Signup and view all the answers

    How does the temperature sensitive element in a T&P valve operate?

    <p>A wax-filled thermostatic sensor probe expands against the force of the compression spring</p> Signup and view all the answers

    Why does the combination temperature and pressure relief valve open to relieve excess pressure?

    <p>To provide protection for over-pressurization</p> Signup and view all the answers

    What type of device does not operate with a pop action when over-pressurization occurs?

    <p>T&amp;P valve</p> Signup and view all the answers

    What is recommended for T&P valves?

    <p>Annual try lever tests.</p> Signup and view all the answers

    Why are additional overpressure protection devices required for hot water heaters or tanks that actuate only on temperature?

    <p>To provide protection in case of overpressurization.</p> Signup and view all the answers

    What happens when the wax in the thermal element contracts in a T&P valve?

    <p>The valve automatically recloses.</p> Signup and view all the answers

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