Dear Pokala Ramu,
I have been in the powerplant piping industry where the PWHT will be done on the A335 P91 welds together with the gamma plugs after RT acceptance. This practise is accepted as grain refinement will occur in a homogeneous way and we dont have to subject the same material to PWHT time again and again. If you are worried about deformation, then that is entirely different story.
On Fri, Oct 25, 2013 at 4:34 PM, pokala ramu <pokala.rams@gmail.com> wrote:
Dear All,--We are going to carry out weld repairs on our Amine regenerator column during shutdown. Repair will be carried out by weld build up due to internal corrosion. At the same time there is a modification in the column we are adding two 12"Dia nozzles. at 1meter higher elevation from the weld repair location. Due to service requirement PWHT is mandatory. In order to reduce shutdown window there is a proposal to carry out carry out PWHT on newly added 2 nozzles and the weld repair location at the same time. Is it allowed to carry out the PWHT at the same time?At Nozzles PWHT will be carried out by Bulls-eye technique and at the weld repair location PWHT will be carried out by circumferential band heating of the complete column.Is there going to be any issue with the deformation etc. Kindly share your experience.the details of the column are as follows:1. Material: A516 Gr.552. Diameter: 4meter3. Height: 20 meter4. Thickness: 11mm5. location of nozzle addition: 4 meter from top6. location of the weld repair: 5meter from topAppreciate your advises.with best regardsRam Pokala
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