Chinese steel in pressure piping
Chinese steel in pressure piping
(OP)
Has anyone has had experience with chinese steel pipe for operating pressures of 150 PSI. ASTM A234?
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Chinese steel in pressure piping
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Chinese steel in pressure pipingChinese steel in pressure piping(OP)
Has anyone has had experience with chinese steel pipe for operating pressures of 150 PSI. ASTM A234?
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RE: Chinese steel in pressure piping
By the way, 150 psi is not a high operating pressure. If you have any specific problem on this operating pressure, please advise...
RE: Chinese steel in pressure piping
http://eng-tips.com/viewthread.cfm?qid=186889, and http://eng-tips.com/viewthread.cfm?qid=172967 etc.
RE: Chinese steel in pressure piping
Did they not supply mill test reports?
RE: Chinese steel in pressure piping
RE: Chinese steel in pressure piping
If it wasn't in a spec or part of the original contract, you could offer to replace them at additional cost/time. But it doesn't sound like they have cause to reject.
RE: Chinese steel in pressure piping
RE: Chinese steel in pressure piping
One of the threads that rconner refers to involves that famous P91 "high energy piping" power plant disaster that killed three involving (longitudinal)seam welded pipe.
One of the poster's to that thread stated that:
"The Chinese Government has also banned Chinese made pipe for use in major power plant critical applications."
It is my understanding that, after many years of industry experience, and the development of Chinese Quality Control Stsandards and Design Specifications, the Chinese are now accepting thier own domestically produced P91 piping...
RE: Chinese steel in pressure piping
RE: Chinese steel in pressure piping
Acceptable within tests and spec but terrible in handling and transportation by ships. They knew how to build it but didn't know (care) how to transport it. This had caused many damages to the external coating and edges of the internal lining.
More general perspective: Chinese stuff can be anywhere between a junk and super quality. Check what you buy and what you pay.
You didn't mention the diameter. This is important especially concerning the transportation.
RE: Chinese steel in pressure piping
General comment: In terms of trusting a CMTR as full validation of the material recieved, I have found many a mixed steel whose markings matched those on the supporting CMTRs.
RE: Chinese steel in pressure piping
The point is that China is rapidly moving through the stages of development and it is a HUGE economy. I'm confident that WaterPipe has it right--their products do range from junk to super quality. In a few years we'll start to see the "usual" product from China being better than "acceptable". Be really careful with "No Chinese Steel" policies because the stuff that was junk will be evolving every day with market forces.
David
RE: Chinese steel in pressure piping
For smaller orders, you will have less control. You send the 3rd party to the distributor, and keep records of who did what to you. I have had 3rd parties tell me the distributor looked through a file of mill certs until he found one that met requirements; then promised the pipe was from that heat. For CRITICAL small orders, you have to do NDE and physical tests, regardless of origin.
RE: Chinese steel in pressure piping
Regards
athomas236