18 Questions
What is the maximum pressure at which the safety valves for a steam boiler should discharge?
15 psi (100 kPa)
What is the smallest size of safety valve allowed for a steam boiler as per the ASME Code?
NPS ½ (DN 15)
What is the requirement for the body drain connections of safety valves and safety relief valves?
They should not be plugged during or after field installation.
What is the maximum allowable pressure rise with the fuel burning equipment installed and operated at maximum capacity?
15 psi (100 kPa) above the maximum allowable working pressure
Which type of safety valve is required for each steam boiler as per ASME Code?
Spring pop type
What is the largest size of safety valve allowed for a steam boiler under ASME Code?
NPS 4 (DN 100)
Where must safety valves and safety relief valves be installed?
With their spindles vertical
What is the requirement for the location of safety valves and safety relief valves?
In the highest practicable part of the boiler proper
What is the requirement for the discharge pipe of the safety valve?
It must be properly drained to prevent collection of water
What is a characteristic of low-pressure safety valves?
They are taller and narrower than high-pressure safety valves
What type of action should safety relief valves have when tested by steam?
Pop action
What should not be placed between the safety or safety relief valve and the boiler, or on discharge pipes between these valves and the atmosphere?
A shut-off valve
What must be done if a long vertical discharge pipe is required for a safety valve?
Install a flexible joint near the safety valve
What is a characteristic of safety relief valves compared to safety valves?
Their pressure is non-resettable
What should never be done under any circumstances with a pressure relief valve?
Plug its outlet
What could be a cause for frequent safety relief valve operation in a hot water heating system?
A waterlogged heating system
What should be done if scale, corrosion products, or chemical residue accumulations affect the operation of a safety relief valve?
Clean and remove the accumulations from the valve seat
What should not be present at any time in a hot water heating system according to the text?
Compressed air or nitrogen
Test your knowledge of the ASME Section IV requirements for pressure relief valves and devices used in heating boilers. This quiz covers the construction, code requirements, and operation of safety relief valves as per ASME BPVC Section IV rules.
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