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...
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.
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?
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...
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...
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...
Hi all,
I am reviewing one WPS which is supported by 3 PQR’s and was confused by the vendor’s documents. Impact test is required for the Welding Procedure qualification (Design temperature of vessel is -46 DegC).
WPS (SMAW):
Base metal: P1 Gr.1/2 to P1 Gr.1/2
Base metal Thickness range...
what is the definition of "Ferrous Metal". I am trying to understanding if Austenitic stainless is Ferrours Metal or not.
I searched on the internet which defines "Ferrous Metal" as metal contain a certain percentage of Iron. Therefore Austenitic stainless steel is Ferrous Metal.
Please advise.
In AWS D1.1 welding procedure qulification, what is the difference between the Qualification by tesing and Procedure Qualification Record (PQR). It looks like they are the same.
Please advise, thanks.
Can anybody adivse which standard is used for the Liquid Penetrant Examination for Iron Casting?
I have a iron casting pump (API 610 I-1) and want to set up the acceptance criteria of Liquid Penetrant Examination on casing material (Iron casting)
Please advise.
For some reasons, we can not find the 321SS or 347SS bolting materials. Our client indicated that we can use Inconel 600 or Inconel 625 in lieu of 321SS or 347SS as the bolting materials.
The service condition:
Desgin temperature: 430 C;
Maximum Operating Temperature: 400C
Hydrogen Partial...
I am reviewing vendor's welding procedures on a Vessel, which requires impact test.
The welding process is SAW. The vendor provided two PQR(s) to support one WPS. Impact test is required. ASME IX is used for the qualification.
PQR-1:
Test coupon thickness: 8 mm
Maximum Interpass temperature...
We are designing a Caustic Tower with 18% caustic solution and 1000ppm H2S, Cl less than 50ppm. Which materials is better for the metallurgy of trays? Our previous seletion is 410S. I am thinking the reason for the seletion of 410s.
How to evaluate the corrosion rate for these two materials at...
Guys, I need your help.
I am reviewing welding procedures for a 304L Stainless Steel vessel. The design temperature of the vessel is -127C (-197F). According to ASME VIII, impact test is exempted for the base metal (UHA-51d). However, impact test for welding procedure qualification can not be...
