Can ASTM A487 Gr 4C be alternative material (valve body material ) to A216 WCB specified in Client Piping Material specification?Butterfly Valves In other words the problem is as follows: Client piping specification stipulates A216 WCB as check valve body matrial. Vendor is propsing A487 Gr 4C. Shall I accept or not. ASTM A487 material is generally much higher strength than A216 so given your design pressure, it was probably selected for that reason. However, this is not a listed material in ASME B16.34 so the valve would not be able to be stamped as an ASME B16.34 valve if that is a consideration - depending on the valve standard it is made to, it might be considered an unlisted component under B31.3.Bellows Seal Valves In sour (containing hydrogen sulfide) service, the material may be questionable since the high strength may lead to problems meeting NACE/ISO requirements. Check Valves Other than sour service, I can't think of a general problem with the material right now. Ultimately, doesn't the client need to accept or not since it is his specification that you would need a waiver against? Can you advice the generals rules governing acceptance or rejection of alternative materials that Vendors proposes. I know that SS can't be substitud by CS or low temp CS and low temperature CS can't be substitude by CS. But when both material (requested and propsed one) belongs to same family, I can't make judgement. Are SMYS and UTS only the points to check? Plug Valves 3)What will be the problem if the valve will not be stamped B16.34?Safety Valves 4) if A487 Gr 4C is acceptable as alternative to A216 WCB, why do you think that Client may reject waiver to his specification.

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