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:
-- 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 mentPic AttachedRegards,Pradip
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
Visit this group at http://groups.google.com/group/materials-welding.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/f971b1aa-d3d4-43cc-974e-8cbf851ac79a%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
No comments:
Post a Comment