wall thickness tolerances for ferritic seamless pipe for natural gas
wall thickness tolerances for ferritic seamless pipe for natural gas
(OP)
Does anybody know what are the tolerances for wall thickness of ferritic seamless pipe use to transport natural gas? Somebody told me that it is -12.5% and +20.0%, is this correct?
Thank you,
Jaime L
Thank you,
Jaime L





RE: wall thickness tolerances for ferritic seamless pipe for natural gas
Half is true, the first half. In the calculation of the available reinforcement, you deduct the 12.5% of "mill tolerance" and also deduct the corrosion allowance if applicable.
cheers,
gr2vessels
RE: wall thickness tolerances for ferritic seamless pipe for natural gas
In theory you can amke use of the better actual wall tolerance as follows: another code paragraph also allows the design pressure to be set based on measured wall thickness, if a truly all inclusive survey of the entire pipe is the basis of the as -recieved wall thickness.
RE: wall thickness tolerances for ferritic seamless pipe for natural gas
Get out the spec and read it.
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Plymouth Tube
RE: wall thickness tolerances for ferritic seamless pipe for natural gas
But you can ask for better tolerances and indeed the good mill can do it for you. But you have to work out with mill to find a reasonable price and min purchase volume.