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WPS with Impact & PWHT for non impact lines(non Sour service)
2

WPS with Impact & PWHT for non impact lines(non Sour service)

WPS with Impact & PWHT for non impact lines(non Sour service)

(OP)
Dear all,

We have a Sec IX qualified WPS for Sour service with impact & PWHT, I wonder can we use the Same for line which is non Sour and dosent require PWHT(Thickness-19mm).

Kindly clarify,

Thanks & Regards
MechInspec

RE: WPS with Impact & PWHT for non impact lines(non Sour service)

Per Sec IX rules, an impact tested PQR will support an non impact tested WPS, however, PWHT is an essential variable.  You can't generate a non PWHT'd WPS supported by a PQR that received PWHT.

RE: WPS with Impact & PWHT for non impact lines(non Sour service)

(OP)
Thanks for Your reqlay. It means we cant use ie PWHT'd PQR to support non PWHT WPS.

Again Instead of qualifying a new procedure is it allowed as per codes to do the PWHT for line which is not havin any requirement as per the calss.

Pipe Class# API 5L, 60" X 19.05 Thick
Design Code# B31.3, Sea Water Service

Thanks & regards
MechInspec

RE: WPS with Impact & PWHT for non impact lines(non Sour service)

You can always PWHT the welds in the line using your WPS qualified with PWHT.

Why would you want to do so? Qualifying a procedure without PWHT is economicaly beneficial to you in the long term.  

RE: WPS with Impact & PWHT for non impact lines(non Sour service)

I agree with Stanweld, in fact, it'd probably cost more to PWHT a 60" joint than it would to qualify a procedure.

RE: WPS with Impact & PWHT for non impact lines(non Sour service)

Don't look at a WPS as a project cost; they are Capital.  One PQR can generate multiple WPS's [within the limits of Essential Variables], and each WPS lasts the lifetime of your company.  This makes WPS's a more durable Capital Expense than your corporate building.

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