Tuesday, November 24, 2015

[MW:23909] Bulge P-91 Pipe after PWHT

Dear Expert,
In P91 Material ( HRSG header Joint ) after pwht one joint is bulge.We did  Preheating ,Welding , Post Heating,& PWHT in proper way.
Can anybody explain why this bulge occurs & remedy.
During fit-up inspection & weld visual inspection all round the joint is perfect but after PWHT pipe is bulge 140 mm away from the   weld ment
Pic Attached
Regards,
Pradip

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