Re: [MW:30229] A335P11 material - Delayed PWHT condition

Dear Mr.Kannayeram,

Thank you.

We are going to use GTAW & FCAW combination for it.  After welding complete for the 6 Set. of A335 P11 Pipes as per the previously sent sketch, we are planning to do PWHT, either by local method or at Subcontractor's heat treatment area , all together in one time.

So, it may take Min. 1 day gap for PWHT preparation, after the completion of welding.

Also, if you have any spec for Preheat maintenance, its control and PWHT requirements for A335 P11 materials, then please send me a copy.

Regards,

Saravanan,

Korea

 

On Mon, Nov 11, 2019 at 12:16 PM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

U can. Since it is bainatic structure, hardness level may not be as high as in Martensite structure. Why do you want delay in doing PWHT, if NDE is delayed, it is a reasonable one after PWHT because of delayed crack 

On Fri, 8 Nov 2019 8:48 am PARAI Reaction Channel, <saravanshyla@gmail.com> wrote:

Dear Experts,

For one of our project, 

With reference to the sketch shown below, we are going to weld 4 number of Single V Butt joints for A335P11 to itself ( P No. 4 ), pipe Thk of max 28.6 mm by using GTAW & FCAW process ,

Preheat Tempr. of Min. 120 Deg C ( Plan to use Burner ) and PWHT from 650 to 707 Deg C as per ASME B31.3 code.

After we complete the welding in our shop and bring back to the normal ambient tempr. around 15 Deg C, can we do PWHT after 1 or 2 days gap and then we do RT and PT ?

I worry that, during winter in Korea, the ambient tempr. may drop to Minus 10 Deg C.

As there is no weld spec from client for P No.4 , can we do PWHT after 2 days gap.

Please suggest me with any weld instructions for P. No.4 , Preheat maintenance, in order to avoid any crack after welding and with delayed PWHT condition.

With best regards,

Saravanan.Sornam,

Korea

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