Re: [MW:20460] Fwd: Impact Test Acceptance criteria at higher design temperature

Dear Mr.Rana,

I presume that ,you are asking why the lab have chosen -30°C for testing & how the results are accepted even the values are lesser than 27 J in HAZ.

Acc. to the information given by you the coupon thickness is 5.486 mm & lab have taken sub size specimen, that is 3.33 mm So they have given the reduction in temperature -10°C from the required test temperature.

further,the acceptance values will be reduced to 10J due to the selection of 3.33 mm sub size specimen.

Regards

DhamodaraN

+974-7736 7260

On Tuesday, 1 April 2014 4:05 PM, Rana Vikas <vhrana@gmail.com> wrote:

Dear All,

One of our PED project, we have welded  a test piece of SA335 P5 & A106Gr.B  having size 3'' Sch 40 for WPS/PQR qualification.The weld test piece have PWHT at 720'C , Keep holding time 01 hrs.

We have required  Impact test value as per our PED guideline as per below

 

Impact test at (- 20'C)  - Average Acceptance value 27 Joules minimum.

 

The test laboratory conducted Impact test at (-30'C) . The result of impact test at  (-30'C) is attached

Above impact test results are meeting PED requirements i.e. Average Acceptance value 27 Joules minimum.

 

Please throw some light on the above issue.

 

With Regards,

Vikas Rana

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