Terence A. Cooper Total Oil Marine plc Aberdeen Total Oil Marine plc (TOM) has developed and successfully employed a high differential pressure, high sealant pig concept as an isolation technique for both topsides and subsea emergency shutdown valve (ESV) installations. In use, the concept required less production downtime than conventional flooding methods (Fig. 1). And the technique, which employs oversized discs, prevented migration of gas to the worksites and provided a contingency differential pressure capability of 11 bar gauge (barg; approximately 160 psig) for the topsides ESV installation and 15 barg for the subsea ESV installation...

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