[MW:29824] Regarding PWHT as per B31.3 and B31.1

Dear All,

I have query about PWHT,

I have qualified WPS and PQR, as per B31.3.(But our requirements as per B31.3 and B31.1 )

Can you please tell me some one, what is difference between theses both standard for PWHT.  

( As per my knowledge  1) PWHT temperature for ASME P number 04 material is different from ASME B31.3 (process) : range 704-746°C to ASME B31.1 (Power) : range 650-700°C.)

Below I have given some WPS parameters for PWHT, please clarify me whether the parameters are correct or Not. 

According to B31.3 -

Material : ASTM A 335 P11 to ASTM A 335 P11 - ( PNo-4; G.No-1 to PNo-4; G.No-1 )

Process : GTAW

Test coupon Thickness :  19.05 mm

PWHT- Temp range - 690°C- 705°C

Heating range : 200°C/hr

Cooling range : 200°C/hr

Interpass temp : 315°C

Post Heating : 300°C -350°C ; holding thickness 10mm to 20mm -30 min / 20mm to 30mm - 90min.

And regarding Backing -  PQR is qualified with Argon, can we use Nitrogen in WPS.

Experts i am looking your favorable reply on my query.

Thanks

Kiran

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