Tube to tubesheet joint with projection per QW 288

[Materials & Welding]

In fabrication drawing, Tube to  tubesheet joint with 4mm projection.
in the Mock-up/PQR, vendor kept 0.5mm projection, but fused the tube with the tubesheet.

Is vendor to provide mock-up with 4mm projection, or change only the WPS to show 4mm projection in the joint, with the same PQR.

as per QW 288 this is not an essential variable, hence in my opinion revision of WPS is OK.

[Sarfaraz Tambe]

No I don't think so Because as per QW 193.1 the mock up assembly shall essentially duplicate tube hole  configuration & Tube to Tube sheet joint design.As you are changing the projection means you are changing the strength of weld required as per design calculation.

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[george....@gr.bureauveritas.com]

I would like to draw your attention the the paragraph (b) of QW-288.1; " A change in the weld joint configuration (beyond the manufacturing tolerance)..."

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
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I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS HELLAS

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Materials & Welding ---29/04/2014 15:57:50---In fabrication drawing, Tube to  tubesheet joint with 4mm projection. in the Mock-up/PQR, vendor kep

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[Prakash Hegde]

Hi!

You require to qualify for each joint configuration separately

Regards

Hegde P.b