Transport/Shipping Damage in B31.3
Transport/Shipping Damage in B31.3
(OP)
Hey Everyone,
I'm trying to find in ASME B31.3 Process piping the allowances for damage to piping (specifically sidewall).
IIRC, scratches and nicks were permissible as long as they were less than 10% of wall thickness, but I can't remember with 100% certainty.
Anyone know where in code it details this?
Thanks much,
Adam
I'm trying to find in ASME B31.3 Process piping the allowances for damage to piping (specifically sidewall).
IIRC, scratches and nicks were permissible as long as they were less than 10% of wall thickness, but I can't remember with 100% certainty.
Anyone know where in code it details this?
Thanks much,
Adam





RE: Transport/Shipping Damage in B31.3
For example - a visual inspection should be documented with photos and maps.
Once this is completed, you need to perform surface NDT to evaluate if any defects were introduced - like cracks or tears.
Next, an assessment needs to be made regarding significance of stress intensification based on the sharpness of the damaged location. Blend grinding may be required to remove any sharp corners.
Once this is completed and documented, you need to evaluate remaining thickness and determine if the remaining thickness still meets the minimum thickness requirements for service based on B31.3.
RE: Transport/Shipping Damage in B31.3
RE: Transport/Shipping Damage in B31.3
If you will go to API-570, you will find everything you need. And BTW, sharp-bottomed scratches/tool marks are not acceptable. They will have to be 'buffed out' to a 3:1 minimum taper angle. Depending on the Line Spec versus the Design Conditions, I have seen a 60% wall loss deemed acceptable.
RE: Transport/Shipping Damage in B31.3
I know 31.3 is for new construction, but tracking down where I can get an exact answer has been a lot of work.
Re:Duwe6
Thanks for the tip, I'm not very familiar with the API codes (I normally work on z662 pipelines, which seem so simple in comparison to plant sites). While the buffing makes sense to get rid of drag/catch points and ridges, I'm surprised that it would be often allowed as I've had client side inspectors go balistic over any loss of wall thickness.
Thanks again everyone, hopefully I'll track down some solid answers on this soon since we have a 14" A333 line and a 36" HDPE line that came from the client in pretty ugly shape.
RE: Transport/Shipping Damage in B31.3
If I was the client and dinged up pipe arrived on my property - either perform a detailed engineering evaluation for acceptance AND require a knock-off the price because of acceptance of pipe that did not meet original engineering specification (B31.3) workmanship or reject it.
RE: Transport/Shipping Damage in B31.3
RE: Transport/Shipping Damage in B31.3