Although the WPS "shall designate whether the lineup clamp is to be internal or external, or if no clamp is to be used at all...", it is NOT an essential variable and unless specified by the client, does not require another PQR.

If you have some doubt about this, I strongly suggest contacting the client. We've only had a limited amount of contact with the pipeline related industries. In each case there are particular details that specific owner/operators consider more important than others. Since the owner/operator has the ultimate responsibility for what happens to their line, sometimes they make unusual demands. Most clients have a specification regarding the percentage of root pass that must be completed prior to removal of the lineup clamp (if used).

Charles Hall