PQRs Applicability for a new welding job 1

[birken]

We need to weld a branch connection of 10 mm thick branch pipe to a header of 30 mm. P.No. is 1. Impact test required and PWHT mandatory.
Two PQRs are available with following thickness ranges:
1. 8.5 - 17 mm (without PWHT) impact tested
2. 16 - 48 mm (with PWHT) impact tested

Can I use these PQRs for the said welding job?

Birken

 

[weldstan]

No. The thin wall PQR must be requalified with PWHT since PWHT is required for the production joint.

 

[steakman911]

Agreed with WeldStan.

You will be better off having both (and other applicable), procedures tested/accepted with PWHT...then you can use them for non and for PWHT applications should the need arise. The extra cost of having a series of CVN's performed is often outweighed by the fact that if you need said procedure NOW, you have it and can save weeks sometimes in getting a New PQR approved by the regulating authority in your jurisdiction...which can be costly by potentially not getting the job in the first place. Having someone familiar with WPS/PQR's review your procedures en masse is often a good practice IMO. You might be surprised by what you find.!

Cheers,

stk

 

[DekDee]

stk,
You cannot use a PWHT PQR to weld a non PWHT production joint and vice versa. (see QW 407.1)

Birken,
You do not state your construction code, this can quite often have a bearing on the PWHT requirements,
Cheers,
DD