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Questions and Answers
What type of safety valves are required for each steam boiler according to ASME Section IV?
What is the maximum pressure at which the safety valves are sealed to discharge in a steam boiler, as per ASME Section IV?
According to ASME Section IV, what is the minimum allowed size for a safety valve for a steam boiler?
What is the maximum allowable working pressure increase when the fuel burning equipment is installed and operated at maximum capacity, as per ASME Section IV?
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What requirement does ASME Section IV have for body drain connections of safety valves and safety relief valves in steam boilers?
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What is the purpose of the body drain connection provided by the Manufacturer for safety valves and safety relief valves in steam boilers?
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Where must safety valves and safety relief valves be installed?
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What must safety valves be connected directly to?
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Where must safety valves and safety relief valves be located?
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What must not be placed between the safety or safety relief valve and the boiler, or on discharge pipes between these valves and the atmosphere?
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What is a requirement for the discharge pipe of the safety valve?
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What is the maximum allowable working pressure for a hot water heating or supply boiler, as per ASME BPVC IV, Part HG-400.2?
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What is a key difference between safety relief valves and safety valves?
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What causes frequent operation or water leakage from safety relief valves?
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What should never be done to the outlet of a pressure relief valve?
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What can cause frequent safety relief valve operation in hot water heating systems?
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What should happen if safety relief valves open frequently during normal plant operation?
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What is the requirement for the location of safety valves and safety relief valves in heating boilers?
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What is a specific requirement for the discharge pipe of a safety valve?
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What should never be placed between the safety or safety relief valve and the boiler, or on discharge pipes between these valves and the atmosphere?
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What is the requirement for the internal cross-sectional area of the discharge pipe of a safety valve?
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What is a key difference between safety relief valves and safety valves?
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What is a requirement for safety relief valves in terms of normal operating water level in steam boilers?
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What could cause frequent operation or water leakage from safety relief valves in hot water heating systems?
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What is the maximum allowable pressure at which the safety valves must discharge in a steam boiler, according to ASME Section IV?
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What is the minimum allowed size for a safety valve in a steam boiler, as per ASME Section IV?
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What is the purpose of the body drain connection provided by the Manufacturer for all safety valves and safety relief valves in steam boilers, according to ASME Section IV?
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According to ASME Section IV, what should not be plugged during or after field installation in relation to body drain connections of safety valves and safety relief valves in steam boilers?
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In a steam boiler, what safety valve capacity is required when the fuel burning equipment is installed and operated at maximum capacity, as per ASME Section IV?
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What type of safety valves are mandated for each steam boiler as per ASME Section IV?
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Study Notes
Safety Valves in Steam Boilers
- Each steam boiler requires two or more safety valves according to ASME Section IV.
- Safety valves are sealed to discharge at a maximum pressure of 3% above the maximum allowable working pressure.
- The minimum allowed size for a safety valve in a steam boiler is 1/2 inch (12.7 mm) according to ASME Section IV.
- The maximum allowable working pressure increase when the fuel burning equipment is installed and operated at maximum capacity is 6% according to ASME Section IV.
- ASME Section IV requires body drain connections of safety valves and safety relief valves to be full-size, and never plugged during or after field installation.
- The body drain connection provided by the Manufacturer for safety valves and safety relief valves is to ensure the valve seat and disk are free from sediment and debris.
Installation and Location of Safety Valves
- Safety valves and safety relief valves must be installed directly on the boiler, or on the piping connected to the boiler, with no shut-off valves between them.
- They must be located on the highest part of the boiler, and the discharge pipe must be full-size and unobstructed.
- No obstruction or valve should be placed between the safety or safety relief valve and the boiler, or on discharge pipes between these valves and the atmosphere.
Discharge Pipe Requirements
- The discharge pipe of a safety valve must be full-size and unobstructed.
- The internal cross-sectional area of the discharge pipe must be at least equal to the full-area of the valve outlet.
Key Differences and Requirements
- Safety relief valves are used for liquid systems, while safety valves are used for gas systems.
- Frequent operation or water leakage from safety relief valves can be caused by improper installation, inadequate overflow, or faulty design.
- The outlet of a pressure relief valve should never be throttled or restricted.
- In heating boilers, safety valves and safety relief valves must be located on the highest part of the boiler, and the discharge pipe must be full-size and unobstructed.
- Safety relief valves must be capable of lifting at a pressure not exceeding the maximum allowable working pressure, and must be set to open at a pressure not exceeding 10% of the maximum allowable working pressure in steam boilers.
- In hot water heating systems, frequent safety relief valve operation can be caused by excessive water pressure, or inadequate or faulty pressure regulation.
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Description
Test your knowledge of ASME Section IV Pressure Relief Valves and Devices, including the code requirements, construction, and operation. This quiz covers the rules for safety valves and safety relief valves installed on heating boilers as per ASME BPVC, Section IV.
