Instrumentation
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Pressure Relief Valves Requirements
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Pressure Relief Valves Requirements
All the pressure relief valves shall be sized in accordance with the information on the data sheet and the method outlined in API RP 520, part I and II, for sizing of pressure relief valves for hydrocarbon systems.
Also called as Bursting discs.
Flanged steel safety relief valves for hydrocarbon systems shall conform to API 526.
Relief valves for the process piping, excluding steam and air pressure piping shall be of the enclosed spring type.
All relief valves for hydrocarbon systems shall conform to ASME VIII.
Seat tightness of pressure relief valves shall conform to API 527.
The total effective flow area of the orifice(s) selected shall exceed the calculated area only by an amount as limited by standard orifice sizes available.
Before orifice sizes Q, R and T are implemented, the relief valve manufacturer shall critically evaluate these large sizes against process medium/conditions.
The number of relief valves shall be kept to a minimum in a multiple safety valve installation. In a multiple safety valve installation, all orifices shall be equal.
Design, sizing and approval of relief valves for utility systems shall be done to a recognised international standard/institution.
Bursting discs shall be designed according to BS 2915 or equivalent.
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1 Reply
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Great summary—especially the references to API 520/526/527 and ASME VIII
One thing I’d like to add is that while API and ASME standards dominate hydrocarbon systems, in many European projects we also see alignment with <strong data-start=”401″ data-end=”433″>EN (European Norm) standards, particularly when it comes to overall building safety, access control, and integrated fire/alarm systems.
For example, EN standards don’t directly replace API/ASME for pressure relief valves, but they <strong data-start=”637″ data-end=”680″>complement the broader safety ecosystem—like fire detection (EN 54) or emergency systems that interact with pressure-related risks in facilities.
If anyone is interested in how EN standards fit into building safety and compliance, this is a helpful breakdown I came across:<br data-start=”915″ data-end=”918″> https://euroindustry.net/en-standard-meaning/
It gives a clear overview of how EN standards are structured and where they apply alongside international codes.
Would be interesting to hear if anyone here has worked on projects where both <strong data-start=”1160″ data-end=”1189″>API/ASME and EN standards had to be followed together?
euroindustry.net
What’s the meaning of EN standard in building security?
EN standard and their meaning within building safety and security includes burglar resistant doors, access systems, emergency exits and more.
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