[MW:24092] Re: tube to tubesheet welding

Dear Sirs, 

Please advice the following, for a Tube to TS welding

WPS

Tube Dia: 25.4mm

Tube Thk: 1.65mm

Pitch : 31.75mmm

Ligament: 6.35mm

PQR

Tube Dia: 19.05 mm

Tube Thk: 1.65 mm

Pitch : 25.4 mmm

Ligament: 6.35mm

My argument is as follows

PQR is not acceptable as supporting PQR for WPS as specified tube diameter is 25.4mm, on the other hand, tube diameter in the PQR is 19.05mm which is less than 90% of the specified diameter 25.4mm. It's against par. QW-288.1(d) of ASME Sect. IX. Hence VENDOR should submit another PQR or re-qualification is required.

PQR with dia less that 90% of OD 25.4 that is between 25.4 - 22.48MM dia shall support this WPS. See JGC comment on QW 288.

But technically as PQR is for lesser dia (of course same tube thk) than actual production/ WPS, it is acceptable.

Please confirm if am right or comment when am wrong.

Regards

SSKumarSelvam

On Friday, January 9, 2015 at 12:09:09 AM UTC+9, venkkatesh krishnan wrote:

Dear Experts,

             I need to do tube to tubesheet welding for CS Steel that is tubesheet material is SA 516 Gr.70 thk 20mm and tube material is SA 179 thk is 2.108mm welding process is GTAW, i have WPS in GTAW process with 3G welding my doubt is this WPS is suit for above mentioned statement or i need to qualify any welder qualification for welding this process. kindly please suggest me what ill do.


i am awaiting for your reply.

Thanks & Regards,

G.Venkkatesh.

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