Steve,
Thank you for you comments, I agree that ISO 15156-2 B.3 may be a valuable test, especially if we encounter more failed bend tests.
The pipeline in question was previously in miscible hydrocarbon service and had no signs of degradation so I am still unsure as to what factors would cause...
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...
Gentlemen,
Thank you all for your input. I think I will request preheat to code temperature prior to cutting for these reasons:
-Preheat will take no more time than grinding off 1/4" of material
-Eliminate potential for lazy welders not removing enough material
-Preheating to code temperature...
metengr,
Yes, the flame cut edge is cleaned up by a grinder prior to welding. How do you ensure that sufficient material is removed? In other words, how will a welder determine when enough material is removed to eliminate any cracks and remove all of the martensite.
Mike
Metalguy,
Thanks for your prompt response. I have been looking at the CCT diagram for P22 and considering the thermal cutting is done in a shop I am questioning whether the cooling rate is fast enough to produce Martensite. Is Bainite equally susceptable to cracking?
Does anyone have...
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...
