Using WPS with PWHT for non PWHT part

[Syahar1975]

Dear experts,

We have 1 tank with P1 Group 2 material and thickness of shell plate is 14 mm.

As required by API 650 all shell nozzles (greater than 2") and shell manholes on these shell courses must be pre-assemblied and PWHT'd before erecting at site. We have WPS with PWHT for this case.

We also have other tank with P1 Group 1 material and thickness of shell plate is 16 mm. For this shell course PWHT is not required. Can I use the above WPS with PHWT for the second case ?

Your comments is highly appreciated.

Syah

 

[DVWE]

Typically you cannot do that. The WPS must be qualified with and without PWHT in order to use it for both.

 

[Duwe6]

When making the PQR coupon for the PWHT WPS, pre-plan a leftover section that you cut off and do not send out for PWHT. Keep that chunk and use it for the non-PWHT test straps. Much easier to weld one huge plate, vs. two large ones.

 

[Syahar1975]

Dear DVWE , Duwe6,

Thanks for the response and suggestion.

So I will make long plate PQR with P1 Gr. 2 material. From this plate I will have 2 PQR coupons. 1 PQR will be stress relieved and the other one no stress relieved.

Than I will make 2 WPS i.e. 1 WPS with PWHT and 1 without PWHT.

Because both of tanks are using P1 material so I do not need to make 1 PQR with P1 Gr. 2 and 1 PQR with P1 Gr. 1.

Is this correct ?

 

[DVWE]

Will you be performing impact testing?

 

[Syahar1975]

DVWE,

Impact test is not required.

Syah

 

[DVWE]

Then P1 Grp 2 to P1 Grp 2 will work. Do as Duwe6 suggested with one large coupon.

P1 Grp 1 to P1 Grp 2 would only be beneficial if impact testing was required.

You will only need to write one WPS, qualified with and without PWHT. Attach both PQRs to the new WPS.

 

[Syahar1975]

Dear all,

Many thanks for your advises.

Syah