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Urgent Welding Isolation Barrier for 20-inch Gas Export Line


Field Service




North Sea

Project Manager:

Peter Bjørnsen

IK received an urgent enquiry for delivery of a specialized 20” weld isolation solution for instalment and removal via a 2” Socket branch connection.

The client planned to cut the existing branch and weld in a new flange and therefore required a welding isolation plug that could be installed and removed via a 2" socket. They also required a test plug, for test pressure 258 barG to pressure test the field weld after welding on the new flange.

Due to space limitations for installing a 2” welding plug, IK suggested the use of our ABiS™ System as an optimal solution, which can be used by installing 2 x double welding barrier sets into the 20” gas export header via a 2” branch.

Both 20” hydrocarbon isolation barrier sets were installed, and removed via an existing 2” branch situated approximately 350mm from the planned 2” branch to be repaired.

The ANSI 1500 gas header pipe was 20"Sch120 and the socket with flange was 2"Sch160 RTJ CL1500 with an inner diameter of 42,82mm.

The provision of localized weld isolation barriers, on either side of the field weld ensured the necessary barriers required for the planned welding operation. By providing a double isolation barrier on either side of the 2” nozzle reduced the standard requirement to totally gas free the 20” header and combined multiple branches on this system.

"Thank you very much for a job well done. I am very impressed with the delivery, both in terms of time and quality in all aspects."



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