Seamless pipe ripples.
Seamless pipe ripples.
(OP)
Curious if anyone has ever encountered ripples/wrinkles in A106 seamless pipe.
Is there an acceptance crtia for this?
Nominal wall thickness is fine but corrision is a concern.
Is there an acceptance crtia for this?
Nominal wall thickness is fine but corrision is a concern.





RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
All I can see in my copy of A106 (2002) is Dimensions section 16.2.3 - for pipes over 10" diameter gives +/- 1% tolerance of the specified ID, if ordered as ID tolerance pipe.
Hope this helps
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
You are concerned that the uneven surface will corrode faster than a smoother as-rolled surface? I am not sure I understand your concern.
It is not an uncommon condition for heavy wall seamless pipe; it results from the piercing operation. I am unaware of any limits other than the wall thickness requirements, which would suggest to me that it is not a major problem for most uses. If it was a problem, there would be limits in the specification.
rp
RE: Seamless pipe ripples.
RE: Seamless pipe ripples.
This condition is common enough that the standards would address the issue directly if product that otherwise met the requriements of the standard, but had this condition, was detrimental to the intended service.
I am still unsure about the source of your concern on corrosion.
Also, the shallow-angle lighting such as that used in the photograph necessarily exaggerates surface irregularities. With incident lighting at 90 degrees, I doubt you would even be able to see them in a photograph.
I have seen these irregularities many times in pipe, but I've seen a lot of pipe. Usually, they are "discovered" by someone shining a light down the ID looking for something other than the ID surface condition, but because of the exaggerated appearance, they "raise a flag" on it. I have never seen a steel mill honor a claim for this condition. The fact that the client accepted the material indicates they did not feel it was worth persuing, either.
rp
RE: Seamless pipe ripples.
You can claim the picture exaggerates it all you want I've seen and felt this pipe in person (6" STD BTW).
Concern for corrosion?
What happens when you run a fluid down a straight run a pipe with no imperfections,excess penetration on welds or poor fit-ups with major miss alignment? Not a lot.
Now through any of these three into the mix
Excess pen your welds going to corrode so much faster as your fluid has a large plain to resist against. Yes there is code requirements for amount of penetration acceptable in a weld and certain services you can forgot about using a SMAW 6010 completely due to the root profile ( yes this is a dirty rod but compare an STT or GTAW root profile simply for penetration which weld has greater penetration?)
Poor fit up or ripples of this nature well your fluid now suddenly doesn't flow as straight more resistance... what happens when a river hits a large rock?
Same principle instead of a straight steady flow your now creating mini vortexes at each one.
Compare a UT thickness reading on a straight run no ripples pipe to one one with ripples after a year in service. You will see the difference.
All our piping is bought through a 3rd party vendor so weather or not the steel mill wants to honor the claim is the vendors issue not ours (even more so when our contract reads we have the right to reject pipe of this nature)
The only thing that the client accepting this pipe means to me is that once they sign off on it knowing the issue its no longer my concern or future legal problem.
All clients are incredibly smart now a days right?
RE: Seamless pipe ripples.
If you did not invoke the Code section at ordering you maybe jeopardizing your claim.
I have rejected materials based on the Code, then the supplier says: I do not go by the ASME Code but ASTM, then I said: read ASTM and advise.
Most materials meet the same specs.
RE: Seamless pipe ripples.
Assuming a mild corrosive service, I would be less concerned with corrosion than with pumping efficiency [from your statement above "more resistance"].