What is the intent of your relief device, is it intended for safety reasons or just pressure control? If it is intended for safety reasons, then what is it that you are trying to protect, what is the source of overpressure and to what codes may it have been constructed? The construction codes followed may define the allowances for overpressure protection such as in ASME Sec VIII. Since you indicated instrument relief valve, are you are trying to protect instrumentation? If so, I'm not sure what codes may apply. Now if what you are trying to protect conforms to the B31.3 Process Piping or the ASME Sec VIII Pressure Vessel codes, then it would seem reasonable to expect that an ASME certified relief valve is used. I don't know about Nupro, but Circle Seal does offer an ASME certified relief valve. The B-31.3 code applies to "Chemical Plant and Petroleum Rifinery Piping" I do belive IA drops out under this particular code and is picked up under B-31.1 "Power Piping". Check with Swagelok & Circle seal, for the standards that they use for quality control and testing. They undoubtedly will be picked up under one of the ANSI/ASME codes. It may well be your Safety Engineer has picked up std/spec. for spring material that is utilised within actual various process conditions. Standards and specificatons are great, until they're misunderstood and missapplied.

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