PWHT exemption for Pipe supports for amine service

[N VENKATESWARA PRASAD]

Dear Experts,

The Primary supports are welded to pipe ( Carbon steel) and PWHT was not done for amine service.  All the butt welds have undergone PWHT.  PWHT issue was noticed after completion of commissioning.  As per API  945, residual stresses are one of the reason for amine cracking.  Please advise how we can convince client  that residual stresses due to pipe supports welding have no effect on amine cracking.

[Ramin Kondori]

PWHT shall be done.

Ramin  Kondori

Sr. QA/QC & Welding Engineer

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PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

On Tue, Jul 9, 2019 at 9:24 AM N VENKATESWARA PRASAD <weldeng...@gmail.com> wrote:

Dear Experts,

The Primary supports are welded to pipe ( Carbon steel) and PWHT was not done for amine service.  All the butt welds have undergone PWHT.  PWHT issue was noticed after completion of commissioning.  As per API  945, residual stresses are one of the reason for amine cracking.  Please advise how we can convince client  that residual stresses due to pipe supports welding have no effect on amine cracking.

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[manish kulkarni]

Are you convinced that PWHT is not required?

If yes, on what basis against cracking mechanisms?

Regards

Sent from Yahoo Mail for iPhone

On Monday, July 8, 2019, 8:23 PM, N VENKATESWARA PRASAD <weldeng...@gmail.com> wrote:

Dear Experts,

The Primary supports are welded to pipe ( Carbon steel) and PWHT was not done for amine service.  All the butt welds have undergone PWHT.  PWHT issue was noticed after completion of commissioning.  As per API  945, residual stresses are one of the reason for amine cracking.  Please advise how we can convince client  that residual stresses due to pipe supports welding have no effect on amine cracking.

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