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Welding X52 pipe to A234 WPB fitting

Welding X52 pipe to A234 WPB fitting

Welding X52 pipe to A234 WPB fitting

(OP)
Customer purchased a 12" Tee strainer with A234 WPB body.
We were just informed it will be butt welded into a pipeline with API 5L X52 pipe.
What are the issues with compatibility and welding?

Design Pressure/Temperature is 1040 psig @ -20 to 150 Degrees F, within the operating range of the Class 600 flange and of the Sch 80 fitting, based on ASME B31.3.
However, the high yield pipe uses a lower schedule - Sch 40, using B31.8 design rules (by others).

I believe they will to have a qualified weld procedure due to material differences.
Weld prep per B31.8 Appendix I.
I don't know what other requirements may be applicable.

RE: Welding X52 pipe to A234 WPB fitting

Matching for strength is easy, just match that of the WPB side of the joint = carbon steel (SFA5.1 & SFA5.18). You will need to machine the WPB side to the pipe dimensions.

Are there Code and/or tech spec requirements for impact testing? (Sorry I am not well versed in either B31.8 or API.) At 1040 psig and -20°F I think that would be technically appropriate, and it could drive your choice of filler metal. But again, using a low alloy steel filler metal will not present compatibility issues.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Welding X52 pipe to A234 WPB fitting

Insert an X42 transition piece.

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