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Joints of pipe with caustic solution need PWHT?
2

Joints of pipe with caustic solution need PWHT?

Joints of pipe with caustic solution need PWHT?

(OP)
Is PWHT for joints of pipe with caustic solution required in any standards or codes? Thanks a lot.

RE: Joints of pipe with caustic solution need PWHT?

Codes and standards only provide minimum requirements for construction, and the designer is cautioned to seek expertise when required. For carbon steel pipe material that is exposed to concentrated caustic solution at or above 120 deg F, yes, PWHT is strongly recommended.

RE: Joints of pipe with caustic solution need PWHT?

If you class NACE RP0472 as a standard or code, then yes.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/

RE: Joints of pipe with caustic solution need PWHT?

You can see NACE RP 0403 as a suitable reference for Caustic Soda service (In addition, NACE RP 0472 for welds in this service)

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