Podcast
Questions and Answers
What type of safety relief valves are commonly used in potable water heaters and hot water storage tanks?
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?
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?
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?
What are the operating temperatures not exceeding for the potable water heaters and hot water storage tanks?
What does ASME BPVC IV, Part HLW refer to?
What does ASME BPVC IV, Part HLW refer to?
What is the purpose of using temperature and pressure safety relief valves in potable water heaters?
What is the purpose of using temperature and pressure safety relief valves in potable water heaters?
What is the purpose of the combination temperature and pressure relief valve?
What is the purpose of the combination temperature and pressure relief valve?
According to HLW-801, how should the safety relief valves be installed?
According to HLW-801, how should the safety relief valves be installed?
What is the function of the pressure-sensitive element in a temperature and pressure relief valve?
What is the function of the pressure-sensitive element in a temperature and pressure relief valve?
What type of temperature relief device melts at 99°C and allows hot water to escape without reseating?
What type of temperature relief device melts at 99°C and allows hot water to escape without reseating?
Why are safety relief valves required to be installed with their spindles upright and vertical?
Why are safety relief valves required to be installed with their spindles upright and vertical?
What is the purpose of additional overpressure protection when temperature relief devices sensitive only to temperature are installed?
What is the purpose of additional overpressure protection when temperature relief devices sensitive only to temperature are installed?
How does the temperature sensitive element in a T&P valve operate?
How does the temperature sensitive element in a T&P valve operate?
Why does the combination temperature and pressure relief valve open to relieve excess pressure?
Why does the combination temperature and pressure relief valve open to relieve excess pressure?
What type of device does not operate with a pop action when over-pressurization occurs?
What type of device does not operate with a pop action when over-pressurization occurs?
What is recommended for T&P valves?
What is recommended for T&P valves?
Why are additional overpressure protection devices required for hot water heaters or tanks that actuate only on temperature?
Why are additional overpressure protection devices required for hot water heaters or tanks that actuate only on temperature?
What happens when the wax in the thermal element contracts in a T&P valve?
What happens when the wax in the thermal element contracts in a T&P valve?
