Piping with ends not square 1

[IFRs]

A company ordered a substantial quantity of 8" to 16" double random sch 40 A106B with beveled ends for tankfield piping. About half came in with the ends not cut square, more than 1/8" off. The piping contractor wants a substantial extra per pipe end, the pipe supplier says the A106B spec is silent on the end cut, the owner is feeling that one or both are failing them in that no one mentioned this in their quotation, no one is to blame and their bank account is taking a substantial hit.

Any thoughts out there?

 

[1503-44]

Pipeline Codes allow joints of 3° misalignment before they are considered as miters. I don't recall if that is also the limit in B31.3.

Assume the 3° Max is half to each joining pipe 1.5°

Sin(1.5°) = 0.026
You could make a reasonable allowance of 0.026 D
Possibly allowing as much as the full 3°, if it involved only one non-square pipe per joint of
0.05 D

A 10" diameter would allow around 1/4" of out of square.
Check their code's miter provisions to see what the lowest misalignment angle would be before it is considered a miter joint.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[mk3223]

Refer to ASTM Code of the A106 pipe for the "End Finish" requirement ....

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1706131959/tips/Doc1_p2t49l.pdf[/url]

 

[LittleInch]

What did the company order the pipes to?

A particular pipe specification or just "double random 8" pipe to A106B"

API 5L quotes out of squareness at 1.6mm, regardless of size. That's 1/16".

It looks like A106 doesn't specify what "square end" actually means or provide a tolerance.

Can't the fabricator just rotate the pipe to reduce the maximum gap?



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[1503-44]

It sounds like the spec was "We need some pipe". A106? Yeah. Sure.
A106 only addresses the pipes wall.
API 5L is written for fast welding fit up, but it is not used in plant work. It has that tight square cut limit because you can't waste your time doing end preps and rotations when you have 132,000 welds to make.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[KevinNZ]

Have been in this situation as a contactor. Because the client supplied pipe was spec'd to API5L We got a variation to cut all the ends square. Don't know if the client got this cost out of the pipe supplier.

 

[IFRs]

Thank you all for your contributions.
Essentially:
The pipe supplier is exonerated but their work could have been better.
The pipe installer and the owner have reached a compromise.
Tempers have cooled down and work is proceeding.

 

[LittleInch]

What was the compromise?

Don't keep us in suspense....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[1503-44]

Rotate the pipe?
It kind of sounds like a contractor extortion attempt. Making problems that really are not there.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."