Seamless Pipe with PWHT Designation
Pressure Vessel, Risk Management, Mechanical Engineering, Pipe, Piping, PWHT randy bogard Pressure Vessel, Risk Management, Mechanical Engineering, Pipe, Piping, PWHT randy bogard

Seamless Pipe with PWHT Designation

A Post Weld Heat Treatment (PWHT) designation for Seamless Pipe? Is that crazy?

It may not be standard procedure, but it isn’t crazy. I like to specify PWHT for seamless pipe materials when the pipe specification service calls for PWHT.

Let’s take a look at a common scenario where calling out Post Weld Heat Treatment (PWHT) designation for Seamless Pipe could have saved a big headache. In the example picture a new circuit was added to an existing circuit with a required PWHT designation due to service requirements. Since the seamless pipe did not have a PWHT designation, the welded pipe added during an expansion did not receive the required post weld heat treatment. The new pipe section that did not receive PWHT quickly experienced in-service issues.

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