I have qualified a welder on a 2.5" pipe XXH strong in 6 G position. Per Sec IX if the deposited weld thk is more than 3 passes the welder is qualified for maximum thk. However my question what will be the minimum thk the welder is qualified to . Will it be 1/16 to unlimited.
We are in the process of fabricating heat exchanger where the shell side is to be tested at 770PSIG. The tube sheet has 2 grooves and the tubes will be welded with 2 passes.
My question is as follows.
1) should expansion be performed before or after welding
2) Is Hydraulic expansion a better...
i am planning to appear for API 570 exams and would like to know if anyone can provide me with the material. I have already bought the codes as required by API, but looking for some more material,
I have to Qualify a mock up procedure of Tube to tube sheet weld as per QW 193.
Material is as follows.
Tube Sheet - SA 350 LF2 Class 1
Tubes -SA 334 Gr 3.
Can someone provide me with information regarding the filler wire to be used for welding
Mike,
Thanks for your reply, but my dilema is that the MDMT is not for the process but the ambient conditions at site. And as the baffles and tierods are supporting the whole bundle assembly my worry is that it may collaspe.
What should be the material used for Baffle plates and tie rods if the MDMT od the Tube side and shell side is -26°F. Should regular material suitable for -20°F can be used for this ??.
I plan to run welding procedure with SB163 N04400 to Sa 516 Gr 70 , and I need some advise . This procedure will be used for welding tube to tube sheet joint.
I have to run a welding procedure as per Sec IX. MAterial is SS 304 with Solution annealing.Thickness of the coupon will be 1/2" plate. Can someone recommend the solution annealing time and temperature cycle.
Merzi
Can anyone please explain the difference between seal welding and strength welding of heat excahnger tube to tube sheet joints.
As far as i understand Strength weldg is determined by performing a mock up of the joint followed by push out test.
I have to qualify a welding procedure for Duplex material (UNS 32205). Which welding wire should I use for welding, and what precautions are to be taken during welding
Merzi
The extreme fiber elongation as per the formula given in UCS 79D.
what should be the value of t ( minimum or nominal)
what should be computed for Rf (mean kunckle radius)
During insertion of a U tube bundle, it was observed that because of the ovality in the shell it was difficult to push the bundle inside. In this case what is the best solution.
a) to grind the baffles ( which i think is not the best thing to do) or
b) grind the areas in the shell
Merzi
What is the right method of cleaning stainless steel elds after final fabrication. Is there any environmental friendly method of doing it. At the moment we are using food grade acid to clean it .Any suggestions.
Merzi
