12.5 % + or - WALL TOLERANCE ON CARBON STEEL PIPE

[APIpipeWholesaler]

Greetings everyone,

The general consensus is that pipe carries a + or - 12.5% wall thickness tolerance and has been around for 50 years.

I am currently dealing with SAWL 36 x .750 wall API 5L x52 pipe. I am being asked to prove that the + or - 12.5% wall thickness tolerance is in play for this SAWL size pipe.

Keeping in mind that LSAW cannot carry an ASME nor an ASTM monogram, where can I find in API 5L 46th Ed. the wall thickness TOL.?

The general wall Tolerance for welded pipe >.591 wall is +-1.5 (.060) Annex J and annex N clearly state that welded pipe over 14" .984 wall are +-12.5%

As always thank you in advance,

-=Fred=-



Vass Pipe API Line Pipe Industry Leader

People do what you inspect, not expect!

 

[GBTorpenhow]

Wall thickness tolerances are given in Table 11. For welded pipe they are tighter than 12.5%.

 

[APIpipeWholesaler]

Thankyou for your response.

I don’t want to come across as uneducated but in the case where API stated:

The general wall Tolerance for welded pipe >.591 wall is +-1.5 (.060)

What would the + or - tolerance equate to on .750 wall??? What is the formula. As far as I know it doesn’t carry the “t” designation. I believe all it says is milimeter.

Thanks again

Fred

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Vass Pipe API Line Pipe Industry Leader

People do what you inspect, not expect!

 

[LittleInch]

Correct.

Above 15mm, the tolerance goes to a fixed thickness + or - , not a formula.

So your tolerance is 1.5mm



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