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metengr: Thanks for your information. But I still not understand why UG-84(c)(5)(b) is not applied. Looks like this is the impact temperature requirement for both production and PQR impact tests.

I am reviewing a welding procedure which is applied to a vessel with a Minimum Design Metal Temperature (MDMT) of -50 deg F. The PQR test coupon thickness is 0.375 inch (9.525 mm). The impact test specimens are sub-sized impact test specimens: 10 mm x 5 mm x 55 mm. The PQR shows that the impact...

Thanks metengr; SnTMan

metengr Thanks for your comments. Please see the attached drawings. Regarding Questions 2, we knew that production impact test is requird for the vessle. but I dont know if we need producion impact test on this kind of nozzle or not. I read UCS-67(d) and UG84(i), but I can not get the answer...

I have the following issues need your help: (1) Is the circumferential seam of nozzle pipe to flange weld joint a Category B joint or Category C joint? I read ASME VIII Div.1 UW-3, looks like it is a Category C joint. Fig UW-3 confused me. (2) If the vessel MDMT is -46 DegC, is production...

I have a pre-qualified welding procedure which is used to weld structural steel A36 to 304SS. I have two questions: (1) Which AWS-welding code I should use? D1.1, D1.6 or others? (2) Does AWS code allow pre-qualifition on dissimilar welding of A36 to 304SS? Please help. Thanks.

Can somebody tell me the UV degradation of Polyethylene and FRP? We are planning to fabricate a tank using Polyethylene. If the Polyethylene tank is served under the sunlight, how long we can use it (How many years)? Thanks a lot.

I checked with the pump manufacturer. They told me that ASTM A582-Gr416 is their standard shaft material for -46 DegC. But I am still not comfortable with it.

Can ASTM A582-Gr416 be used for the pump shaft at the minimum design temperature of -46 DegC? Thanks.

Thanks.

1.25Cr-0.5Mo Pipe was designed and fabricated per ASME B31.3. The design temperature is above 455 DegC. Based on ASME Code, Carbon steel can be used below 427 DegC for pressure components. Can I use Carbon Steel structure steel member for the pipe support?

GRoberts: Thanks for your reply. So, for welding procedure qualification, which one should be used, "As-detail" or "As-fit". Based on your interpretation, we should use "As-detail" tolerance because it is drawing.

In AWS D1.1, tolerance of the joint dimension is defined in Figure 3.3 and 3.4 by "as detailed" and "fit-up". What is the difference between "as detailed" and Fit-up". For example: (1) For prequalified WPS, which tolerance I should use? (2) For WPS qualifed by PQR, which tolerance I should...

May be the PTFE-Lined valve is available on the market. But our supplier can not make it. That's the reason the want us change to alloy valve. If we use solid PVDF or PFA, what is the plug or other internal material? Thanks.

I need to select a material for a valve which will be served in 12.5% sodium hypochlorite solution. The normal operating temperature is 35 DegC and Design Temperature is up to 65 DegC. At first, we selected Carbon Steel with PTFE lining. But the valve is too small to be lined. Please advise an...

I have a weld end preparation, which is shown in the link below: http://files.engineering.com/getfile.aspx?folder=831d2aa3-663c-4b21-8e99-2627b8185151&file=Weld_End.bmp Welding ends shall be prepared per ASME B16.25. If the thickness is greater than 22 mm, ASME B16.25 (2007) Fig. 3 shall be...

SJones: The PQR tests were passed.

I have one question about welded 304 Stainless Steel pipe. The applicable pipe specification is ASTM A312. The manufacturer's welding procedures indicate that the pipe is welded by PAW without filler metal (first layer, Machine type) and GTAW (Second layer, Manual type) without filler metal...

GRoberts: QW-401.3 (the second paragraph of this section) indicates that additional test coupon should use the same procedure and same essential variable. It means that the addition test coupon thickness is the same as the orginal test coupon thickness. Probably this is the reason why the...

Metengr, Thanks for your time. It looks like the thickness of 0.24" is used to simplify the process. Actually I understand why the vendor speicfy 3/16" as the minimum, just like you mentioned above. My concern is the maximum thickness range. Impact test is performed only on PQR-2/3, which...