Monday, November 30, 2015

[MW:23935] Re: Bulge P-91 Pipe after PWHT

This bulging is due to restricted movement of the parts being post weld heated during PWHT .
Due to restraints at the end of the  pipes, the bulging might have taken place.
Also pl note  that PWHT temperature is a bit high ie 750 - 760 Deg C for GR 91   as compare of GR 22 , GR 11 ETC

On Tuesday, November 24, 2015 at 2:07:20 PM UTC+5:30, pradipsil wrote:
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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