X-Grade Pipe Question

[canecutter]

We've got a rush job and need some X60 Grade pipe w/1.00" wall. Our client has located some russian smls 1.00" wall pipe stamped X42/A106B/A53B.

The MTR shows a YS of 61 ksi and an UTS of 80 ksi. The supplier is telling our client the pipe is X60 which was simply stamped X42. Our client is asking our opinion on whether or not to purchase. We've said no, but they are in a jamb. Is there anything that can be done inspection-wise to re-certify the pipe? Can the mill issue some paperwork in that regard? Anyone have experience in this area?

 

[BigInch]

What's the code?

US Regulations, CFR 49 part 192 & 195 (they are on the web)have guidance on classifying pipe at various yields which may give you some ideas. In some cases it will even allow uncertified pipe to be used, but at very low hoop stresses.



BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[canecutter]

Gas transmission pipe in a compressor station - B31.8.

Thanks for the guidance.

 

[SJones]

Seems a bit strange to pump a simple A106B up to 414 MPa yield strength. If you trust the mill - take the pipe and get it tested at a test house to get your own certificates; then keep your fingers crossed that the installation contractor can weld it. What heat treatment condition is it in and what chemistry does it have?

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[dcasto]

B31.8 has the number of destructive tests required per unit to establish a grade. I'd also have a lab do chemical/carbon analysis that supports the yield testing. I've done this for a line that was constructed in the 70's that we put into B31.8 service (DOT). We removed some underground valve sets and recovered 3 joints each time, then we bored some canals and took the aboveground crossing pipe and finally did some random tests. We went from an unknow and previously assumed Grade B to X42 and got a few more PSI out of it. The hydrotest was fine and we were on track.

 

[stanweld]

If your supplier is able to do so, request that the certificate be reissued by the manufacturer as 5LX-60.

I have had this done more than once, but not from a Russian manufacturer.