Supergrip have successfully completed the supply of two bespoke pipeline plugging systems for the Maersk Janice.

The first plug supplied was a 14” NS Flushing Plug which was diver installed and activated and was capable of withstanding differential pressures of upto 60 bar.g. The plug incorporated a sealing elements, a restraint collets and a 4” 206 hose connection. The plug was subjected to a successful pressure test witnessed by client representatives.

The second plug, also rated to 60 bar.g, was an Isolation Plug used to provide double block bleed isolation behind an ESDV. The plug was installed through a cut flexible flowline and hydraulically activated by ROV to isolate the ESDV. As the plug was a permanent installation a locking system was [provided within the body of the plug to enable the hydraulic pressure to be removed. The locking mechanism could also be released by divers at a later date for plug removal. The plug also incorporated pressure verification, downstream monitoring and hydraulic deactivation.

Once the plug was activated and a pressure verification test was performed divers were then able to remove the lifting bracket from the plug and unbolt flanged end of the cut flexible flowline. A blind flange was then installed onto the end of the ESDV which was connected to the Isolation to enable long term pressure monitoring.

Gordon Conlon, director at Supergrip said “This project was an excellent example of Supergrips capability to deliver a bespoke application on a fast track schedule The Isolation Plug in particular had many challenges to overcome but the design that was developed by our team proved to be the correct solution. During a comprehensive formal testing procedure we achieved excellent reliable results with the plug from all aspects from the installation methodology, activation and release system and obviously sealing capability of the plug itself. All in all a very successful project achieved and each member of our team can be proud of their contribution.”