Cracks on SA213TP347H Tube surface
Cracks on SA213TP347H Tube surface
(OP)
Branched Crack was identified for about 80mm length with zig-zag pattern on Dissimilar welded tubes
between S213TP347H to SA213T91; The crack had branching exactly 3 lines seperated by 120 deg at an
isolated distance of 25 mm; All were joined by a continuous line (which revealed in LPI examination)
One side of crack was originated from HAZ on 347H side and crack runs on 347H side for about 80mm length.
JOB: Superheater coil
SERVICE : NOT PUT INTO SERVICE/UNDER MANUFACTURE STAGE
PWHT: Local Stress Relieving by Resistance method done
Hydro Test at 450 KSC for 5 minutes completed
CRACK WAS OBSERVED DURING VISUAL EXAMINATION
Please throw more light on the root cause for such crack on 347H material.
between S213TP347H to SA213T91; The crack had branching exactly 3 lines seperated by 120 deg at an
isolated distance of 25 mm; All were joined by a continuous line (which revealed in LPI examination)
One side of crack was originated from HAZ on 347H side and crack runs on 347H side for about 80mm length.
JOB: Superheater coil
SERVICE : NOT PUT INTO SERVICE/UNDER MANUFACTURE STAGE
PWHT: Local Stress Relieving by Resistance method done
Hydro Test at 450 KSC for 5 minutes completed
CRACK WAS OBSERVED DURING VISUAL EXAMINATION
Please throw more light on the root cause for such crack on 347H material.





RE: Cracks on SA213TP347H Tube surface
"In this bright future, you can't forget your past..." Bob Marley
RE: Cracks on SA213TP347H Tube surface
RE: Cracks on SA213TP347H Tube surface
Cut it out and have it properly analyzed. It might be worth it to give the same lab your qualification weld sample. There may be lessons to be learned.
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P.E. Metallurgy, Plymouth Tube
RE: Cracks on SA213TP347H Tube surface
Agree with the above recommendations from weldengr and Ed.