Recent content by JXWu

CKerr, thanks for your response.

Dear experts, I am working on a spherical pressure vessel constructed to ASME VIII Div. 2. Min. Design metal temp. is -45°C. There are several nozzles at the top of the vessel. One of them is a nozzle for a level transmitter with a stilling well that goes into the vessel. My question is: do the...

Thanks to everybody for the input and the reference to the code interpretation. Now my client has accepted my PQR as it is. Regards.

Good afternoon. Reference: ASME Section IX and API 650 Welding Process: SMAW My client required the PQR to be qualified with a minimum of 3 PWHT cycles. The material to be welded is 25 mm thick and the PWHT holding is 1 hour. So I PWHT the PQR coupon for 6 hours in one heat. That is, heating...

yes. 2 processes will be used.

Thanks to everyone for the advice!

This is a API 650 single wall cone roof tank

Dear experts, Is it a API 650 requirement that the second side of a double-side welded joint needs to be back-chipped at least one-third of the joint thickness? I cannot find this requirement in the API 650 12th edition. Need advice. Thanks

Dear experts, API 650 storage tanks My welding process is FCAW-G. On the shell vertical seams, I am considering a single-vee joint, single side welding with ceramic backing. Another option is single-vee, double side welding, which means I need to backgouge the second side. I need advice on...

The design code is API 650 but this should not be relevant, right? My opinion is that the pqr will not be able to support the WPS because the maximum thickness qualified is 1.1 x 27 = 29.7 mm and the production plate is more than this. I am not sure and would like to get confirmation.

Dear experts, I need some help with QW 403.9 requirement. I have attached a sketch of my PQR joint detail and production joint detail. My PQR is qualified on 27mm thickness plate welded with a single pass EGW. The production weld is a double vee joint to be welded with a single pass EGW on side...

I have submitted a deviation request to the client to use single with SAW process and they approved! Thanks to everybody for the inputs and advice.

Thanks for your response. I am also considering SAW/FCAW combo. Maybe weld the 1st pass with SAW with a 6mm vertical leg length and top it off with FCAW. Thanks.

Dear experts, I am working on a storage tank and the project spec. calls for minimum 2 passes welding on the bottom lap joints. Bottom plates is 8mm thick. I am considering using SAW with auto downflat tractor but not sure if it is problem trying put 2 passes in a 8mm lap joint. Please advise...

In Table 4.4a, A36M is grouped under I and II. Note 3 for Group I A36M says "Thickness ≤ 20 mm." Note 5 for Group II A36M says "...... Thicknesses ≤ 20 mm shall have a manganese content of 0.80 % to 1.20 % by heat analysis. My question is; does the requirement in note 5 applies to note 3 if my...