grey cast iron for sour gas?
grey cast iron for sour gas?
(OP)
Is there any technical reason not to use grey cast iron material inside a valve (not pressure containing) for sour gas applications?
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grey cast iron for sour gas?
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RE: grey cast iron for sour gas?
2)However you should check whether NACE MR0175 applies to your case as it is mentioned in its para 1.3.2.1 "MR0175 need not apply for LP gas when total system pressure is less than 65psia (0.448MPa)".
Bottom line:I should avoid the use of a gray cast iron material in any gas application where a SSC is a potential risk be it a very tiny one.
RE: grey cast iron for sour gas?
The parts i am thinking of are non pressure containing parts inside a valve (a flow diffuser which does not handle any pressure). Please have a look at www.noreva.de, check on products "NRV-Z" and look at the green coloured item inside the valve.
gustorf
RE: grey cast iron for sour gas?
John
RE: grey cast iron for sour gas?
I suppose the "NRV-Z" is an axial check valve the "green cloured " stuff being the trim.When valve is closed the trim is going to face the differential pressure so the stress will be there there;subsequently the SSC risk is high.If my guessing is correct I shall never accept the trim in gray cast iron.