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IK Topside: Back Gas Njord A Offshore HU 2022


Twin-Tyre Flexible Plugs




Norwegian Continental Shelf

Project Manager:

Peter Bjørnsen

For the Njord A Hook-up in 2022, 4 Tie-in spools were installed. Due to pipeline configuration, each hook-up spool had 2 Golden Welds.

Due to subsea specified regulations, after the spools had been installed and welded, the lower Subsea riser interface welds required verified by gauging and inspection.

Due to the design and time aspects made available, IK’s Twin-Tyre Flexible Plugs were chosen for these operations since the tools were readily available and required only some slight modifications. These tools are usually used for weld isolation purposes on hydrocarbon process systems and they provide two barriers which are suitable for localized pipe/spool section isolation and verification.

Once the pipe/spool section has been isolated, backing gas is purged into the annulus and carefully monitored during welding operations, providing the required atmosphere when welding with materials such as 6MO and Super Duplex.

The lightweight Twin Tyre Flexible Plug can navigate through the pipe bends and has the necessary structure to accommodate for specialised modifications such as for these specific successful operations.

"Just wanted to inform you that your technicians get a lot of praise from the Offshore organization, they are constantly mentioned in meetings that they have done a great job and that the equipment has worked as intended” 


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