Pipeline post weld heat treatment
Pipeline post weld heat treatment
(OP)
On a typical pipeline automatic welding spread how soon after the last weld run (fill and cap pass)can/does PWHT take place i.e. how many joints after and typically how long would PWHT process be for heavy wall pipe around 10"?





RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
Would NDE (proposing AUT) be carried out before PWHT.. is this usual?
RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
RE: Pipeline post weld heat treatment
Ideally we want to carryout AUT straight after welding this allows tight process control and fewer defects for repair if the spread has problems. If we wait until after PWHT given time for each joint (hours)then the spread is gone and process control lost.
RE: Pipeline post weld heat treatment