We have just change the welding process of coilsP22 (superheater) from combined process (GTAW +SMAW) to GTAW only, use for welding the center weld of tube, tube weld to return bend(Hair pin) and tube weld to weld-o-let during modularization. we will await until your received the comments of welding book from your customer, if the welding book has no major comments for this procedure. Then we will resubmit this revision for approve later.