CSA Z245.1 specifies that ERW pipe must pass a root guided bend test in order to be qualified for sour service.
My question is: why is a root guided bend test necessary for sour service qualification?
Background: In the process of converting an existing Grade 359 Cat II pipeline for sour...
My concern is whether or not to preheat pipe before thermal cutting. As per API 582:
8 Preheating and Interpass Temperature
8.1 Preheating, where required, applies to all welding, tack
welding, and thermal cutting of ferritic steels except for thermal
cutting of P1 materials. Minimum preheat...