sjones, no spec., just a generalized question all things being equal assuming both have adequate levels of quality assurance. Which is better and why? Thanks
sorry bad choice of words.monolithic isolation joint.I agree with the welding,the contractor made one weld,that they should not have made. we tested across the joint with a megger after welding and the joint tested greater than 5meg ohms as vendor requires.I'm just concerned that applying 1200F...
Thanks for the quick replies.The actual problem area is about 12 inches for the weld centerline and is designed for 175F if we bring the pwht temp.to 1200F we will surely fry the problem area.The plan is to make a trial run to see just how far the heat will radiate, we may have to reduce the...
Gents,Have to weld a 12 inch sch.120 pipe P1 to P1,can't pwht due to poor engineering design. Won't bore you with details. Would like to weld with inco 82. 1)Butter with inco,maintain 200F preheat,max interpass 350F using narrow weld beads to include HAZ 2)Blend butter passes with flapper and...
I have a monolithic isolation joint that has to welded into a ethane/propane line.Engineering requirements are B31.3.The pipe is 12 inch, sch. 120, P1 material which requires PWHT.The problem is the isolating filling material and ring are located approx. 12 in. from the weld which is only...
we will witness fit-up,perform 100% rt and have qualified procedures. the problem is the clients inspector, he says "regardless of our quality, brittle fracture safe gards must be taken and table 331 ( i think not at work)states carbon must be pwht temporary or not. temporary is still a weld and...
now the rest of the story.very few flanges on this job,temporary caps(cs) will be welded to existing pipe,pneumatically tested with nitrogen,in some cases to 2400 psi. then removed and closure welds made ss to ss. there are no service concerns.do i still need to pwht.is brittle fracture a...
