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Pressure Seal Bonnet Valves
The use of pressure-seal bonnet valves should be reviewed and approved on project specific. Their use is limited to Class 900 and higher, and proposals should address suitability in corrosive services.
Valve Position Indicators
Valves for Low Temperature Service
Valves specified to be in low-temperature service should have uninsulated extended bonnets.
Valves in Liquid Service
Double seated valves (including gate valves) specified to be in liquid service should have adequate provision for pressure relief of the bonnet cavity when the valve is in the closed or open position. The liquid should be relieved to the upstream side, unless otherwise specified.
Emergency Block Valves (EBV) in Isolation Service (all Valve Types)
Knife Gate Valves
Knife gate valves should not be used in dangerous material service.
Wafer and Lug Type Valves
Reduced Port Valves
Reduced port or smaller than line size valves (with reducers) may be used instead of full port valves, provided:
For Compact and Extended Body Steel Valves
Threaded and socket welding steel gate valves per API STD 602 and steel globe valves conforming to the applicable requirements of API STD 602 can be used within the following limits:
For Butterfly Valves for Water Service
Rubber lining of valve bodies should be as follows:
For Soft-Sealed Butterfly Valves–Fire-Tested
For Soft Seated Valves
For Butterfly Valves
OverviewThis testing guidance is designed to aid in developing test procedures for a specific project by describing the steps involved …
The methods described below apply to valves designed to isolate equipment, such as chillers, boilers, and cooling towers, from the …
Single or double valves at a classification change should be suitable for the more severe line classification on either side …