According to ASME IX QW-256, QW-255, the deletion of backing gas is considered an essential variable. But, the addition of backing gas is not an essential variable. This means that if you add a backing gas, a new WPS is not required by ASME IX.
However, your customer's specification may require a new PQR, with a new set of mechanicals, reflecting the purged condition..
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pradip kumar sil
Sent: Saturday, July 23, 2011 9:29 AM
To: materials-welding@googlegroups.com
Subject: [MW:11877] P-11 with purging
Hi,
I have one ESTABLISHED WPS for P-11 which is not purged by argon but as per our client specification purging is required for P-11. Can anybody tell me can i use ESTABLISHED WPS for with purged condition. For that one, what is the criteria & where it is written in code.
Regards
Pradip
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