Temperature and Pressure Relief Valves for Hot Water Heaters

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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?

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

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

HLW-800.1 Signup and view all the answers

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

90°C Signup and view all the answers

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

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

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

Annually Signup and view all the answers

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

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

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

Because they do not provide protection for overpressurization Signup and view all the answers

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

Not lower than 100 mm from the top of the shell Signup and view all the answers

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

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

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

By expanding against the force of a compression spring when exposed to high temperature 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?

To provide additional overpressure protection 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?

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

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

The size of the valve outlet compared to the inlet size Signup and view all the answers

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

The water continues to flow until the device is replaced 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?

Safety relief valves 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?

Less than or equal to the maximum allowable working pressure of the water heater 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?

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

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

Safety relief valve requirements for potable water heaters Signup and view all the answers

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

Temperature-sensitive devices Signup and view all the answers

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

$99°C$ Signup and view all the answers

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

Safety relief valve Signup and view all the answers

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

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

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

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

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

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

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

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

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

Not lower than 100 mm from the top of the shell Signup and view all the answers

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

"Fusible element which melts at 99°C" Signup and view all the answers

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

"The water continues to flow until the device is replaced" Signup and view all the answers

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

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

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

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

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?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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