Under API you must have a wps to get a wps you have to do testing from a pqr......... ESTABLISHED AND QUALIFIED
5.1 PROCEDURE QUALIFICATION
Before production welding is started, a detailed procedure
specification shall be established and qualified to demonstrate
that welds with suitable...
The second concern is for hydrogen cracking, since
welds made in-service cool at an accelerated rate as the result
of the flowing contents’ ability to remove heat from the pipe
wall.
The flowing contents cause an accelerated rate of cooling the weld.
For hydrogen cracking to occur, three...
