Temperature and Pressure Relief Valves for 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 relief valves only
  • Temperature and pressure safety relief valves (correct)
  • Temperature and pressure relief valves with no safety features
  • Temperature relief valves only

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

  • 99 kPa
  • 100 kPa
  • 1200 kPa
  • 1100 kPa (correct)

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

  • At least one (correct)
  • None
  • 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 the explosion dangers associated with super-saturated hot water</p> Signup and view all the answers

    Which ASME BPVC Section refers to safety relief valve requirements for industrial and commercial potable water heaters?

    <p>HLW-800.1</p> Signup and view all the answers

    What temperatures are not exceeded by the potable water heaters and hot water storage tanks?

    <p>90°C</p> Signup and view all the answers

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

    <p>To provide protection for both overpressurization and dangerously high water temperatures</p> Signup and view all the answers

    According to HLW-801, what is the recommended frequency for try lever tests of T&P valves?

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

    What is one type of temperature relief device mentioned in the text?

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

    According to ASME, why are relief devices sensitive only to temperature considered insufficient for vessel protection?

    <p>Because they do not provide protection for overpressurization</p> Signup and view all the answers

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

    <p>Not lower than 100 mm from the top of the shell</p> Signup and view all the answers

    What must be provided if relief devices actuate only on temperature, according to ASME?

    <p>Additional overpressure protection in the form of either a safety relief valve or a temperature and pressure relief valve</p> Signup and view all the answers

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

    <p>By expanding against the force of a compression spring when exposed to high temperature</p> Signup and view all the answers

    Why are safety relief valves or a temperature and pressure relief valve recommended if relief devices actuate only on temperature?

    <p>To provide additional overpressure protection</p> Signup and view all the answers

    What is the purpose of a fusible element in one type of temperature relief device mentioned in the text?

    <p>To melt at 99°C and allow hot water to escape without reseating</p> Signup and view all the answers

    What should be considered while installing safety relief valves according to ASME?

    <p>The size of the valve outlet compared to the inlet size</p> Signup and view all the answers

    What happens when a T&P valve discharges overheated water?

    <p>The water continues to flow until the device is replaced</p> Signup and view all the answers

    What type of relief valves are commonly used in potable water heaters and hot water storage tanks as mentioned in the text?

    <p>Safety relief valves</p> Signup and view all the answers

    What pressure should the setting of a safety relief valve be, according to ASME BPVC Section IV, Part HLW-800.1?

    <p>Less than or equal to the maximum allowable working pressure of the water heater</p> Signup and view all the answers

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

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

    What does ASME BPVC IV, Part HLW-800 refer to?

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

    What type of relief devices are insufficient for vessel protection according to ASME standards?

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

    What temperatures are not exceeded by the potable water heaters and hot water storage tanks?

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

    What type of relief valve is recommended if relief devices actuate only on temperature, according to ASME?

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

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

    <p>To provide protection for both overpressurization and dangerously high water temperatures</p> Signup and view all the answers

    Why are relief devices sensitive only to temperature considered insufficient for vessel protection according to ASME?

    <p>They do not operate with a pop action when over-pressurization occurs</p> Signup and view all the answers

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

    <p>By expanding against the force of the compression spring when exposed to high temperature</p> Signup and view all the answers

    What must be provided if relief devices actuate only on temperature, according to ASME?

    <p>Additional overpressure protection in the form of either a safety relief valve or a temperature and pressure relief valve</p> Signup and view all the answers

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

    <p>Not lower than 100 mm from the top of the shell</p> Signup and view all the answers

    What is one type of temperature relief device mentioned in the text?

    <p>&quot;Fusible element which melts at 99°C&quot;</p> Signup and view all the answers

    What happens when a T&P valve discharges overheated water?

    <p>&quot;The water continues to flow until the device is replaced&quot;</p> Signup and view all the answers

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

    <p>The higher working pressure rating of all components in the hot water supply system</p> Signup and view all the answers

    According to ASME, what should be considered while installing safety relief valves?

    <p>The nominal pipe size used to mount the safety relief valve should be larger than that of the valve inlet</p> Signup and view all the answers

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