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API 623 Valve with Corrosion allowance

API 623 Valve with Corrosion allowance

API 623 Valve with Corrosion allowance

Hi everyone

im working in a valve supplier as an application engineer and i need some suggestions from valve experts here.

my customer asking for API 623 Globe valve with corrosion allowance 6 mm. and it will be used for hydrocarbon services.
my question is does wall thickness calculation for my valve shall follow ASME B.1634 wall thickness + CA 6mm or API 623 wall thicknesa + CA 6mm?

thanks a lot for the attention

RE: API 623 Valve with Corrosion allowance


I think below thread answers to your question. Well you need to read between the lines. Courtesy of respected Valve Subject Matter Experts.

Read JimCasey's reply for your particular question. And others for extra insight.


All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected


RE: API 623 Valve with Corrosion allowance

The minimum wall thickness specified in the API 623 valve standard mirrors API 600 specifications and is greater than ASME B16.34.

RE: API 623 Valve with Corrosion allowance

Hi, It should Be as per Design Standard + CA

RE: API 623 Valve with Corrosion allowance

When specifying valve, any mention of corrosion allowance is ludicrous and is lazy piping spec copy paste. API 623 wall thickness is written to copy API 600 wall thickness, which already have built in "thicker" wall thickness added in when compared to ASME B16.34. This was mainly done because we know casting innately have defect in them and the standard was written for a more robust valve. Can you imagine a valve still working after the wall already corroded 6mm down? the seat ring would just fall right off.

However, for CODE purposes, as most likely the piping system is being built to ASME codes, you can go off ASME B16.34 thickness + CA, or if that does not cut it, straight ASME VIII wall thickness + CA. This is just to satisfy CODE, which have nothing to do with actual valve buying.

You will just buy API 623 valve with the "api 600" wall thickness thats been used for decades.

PS: most API 600/623 wall thickness meets the standard 3.2mm CA many people love copy pasting when compare to ASME B16.34

Luke | Valve Hax | https://valvehax.com/

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