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Welding X52 pipe to A234 WPB fitting

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Geof

Mechanical
Feb 2, 2001
59
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.
 
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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."
 
See the thread was linked below for reference. Hope it helps.
thread404-339606
 
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