18 Questions
What type of safety relief valves are commonly used in potable water heaters and hot water storage tanks?
Temperature and pressure safety relief valves
What is the maximum allowable working pressure for the potable water heaters and hot water storage tanks?
1100 kPa
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
What are the operating temperatures not exceeding for the potable water heaters and hot water storage tanks?
99°C
What does ASME BPVC IV, Part HLW refer to?
Safety relief valve requirements for industrial and commercial potable water heaters
What is the purpose of using temperature and pressure safety relief valves in potable water heaters?
To protect against explosion dangers associated with super-saturated hot water
What is the purpose of the combination temperature and pressure relief valve?
To relieve excess pressure caused by thermal expansion and to discharge overheated water
According to HLW-801, how should the safety relief valves be installed?
With their spindles upright and vertical, with no horizontal connecting pipe
What is the function of the pressure-sensitive element in a temperature and pressure relief valve?
Opens to relieve excess pressure caused by thermal expansion
What type of temperature relief device melts at 99°C and allows hot water to escape without reseating?
Fusible element device
Why are safety relief valves required to be installed with their spindles upright and vertical?
To relieve excess pressure caused by thermal expansion
What is the purpose of additional overpressure protection when temperature relief devices sensitive only to temperature are installed?
To provide protection in case of overpressurization
How does the temperature sensitive element in a T&P valve operate?
A wax-filled thermostatic sensor probe expands against the force of the compression spring
Why does the combination temperature and pressure relief valve open to relieve excess pressure?
To provide protection for over-pressurization
What type of device does not operate with a pop action when over-pressurization occurs?
T&P valve
What is recommended for T&P valves?
Annual try lever tests.
Why are additional overpressure protection devices required for hot water heaters or tanks that actuate only on temperature?
To provide protection in case of overpressurization.
What happens when the wax in the thermal element contracts in a T&P valve?
The valve automatically recloses.
Test your knowledge on the construction and operation of pressure relief valves for commercial and industrial potable water heaters and hot water storage tanks. This quiz covers safety relief valves designed according to ASME BPVC IV, Part HLW, operating at pressures not exceeding 1100 kPa and temperatures not exceeding 99°C.
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