Re: [MW:30221] A335P11 material - Delayed PWHT condition

Noted your query,there is no hard & fastened rule in the code for when to start PWHT after welding.In your case only pre heat & post heat is mentioned.Dont forget to maintain 

Interpass temparatue for these P4/P11 matallurgies.

.

However to carryout RT or any NDTs in low ambent temperatures or lower service temperatures,it is preferably after 48hrs. of welding as per good engg. practice.

Check the project spec. for BSR-RT & ASR-RT and comply the same.Check the the hardness of weldments,HAZ and parent metal before & after PWHT.

Regards

IVB

On Fri, Nov 8, 2019, 08:48 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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