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What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

(OP)
What safety & failure issues do I have to be concerned about on welding on the subject matter above.
If welding is not the route can lock ring flanges be used in this service.

RE: What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

Are you referring to a hot tap process or off-line, fully vented pipe system?

RE: What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

(OP)
This line is off-line fully vented.

RE: What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

I don't see any weldability or safety issues. Make sure the weld preps have been cleaned and subject to NDT examination (surface) before welding.

RE: What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

(OP)
Thanks Metengr

RE: What issues exist with welding on carbon steel lines that have been in anhydrous HCL service for 25

I have noticed in the past that there are possibilities of subsurface discontinuties opening up under welding process. So I think that a UT thickness check of about 6" around the welded area be checked prior to welding.

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