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A world record for A.Hak

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World Trenchless,

A.Hak is involved, together with two partners, Porr UK and Skanska UK, in building a new gas pipeline under the River Humber, England. The operations involved inserting 5 km of 42 in. concrete weight coated pipeline under this river. With this operation, a world record has been broken, and this will be registered in the Guinness World Book of Records.

Two of A.Hak's hydraulic thrusting machines pushed 620 m long, tight sections of 850 t pipe on rollers into the brand new tunnel (diameter 3.65 m, 30 m under the river).

The tunnel had been flooded at that time with 50 000 m3 of pure, treated water to aid the installation – enough to fill 16 Olympic swimming pools.

After one pipe section had been installed, the next one was moved into position and welded to the one in front. The push continued until all 5 km of pipeline were fully installed, becoming the world’s longest hydraulically inserted pipe. The next and final stage in the project will be to connect the pipeline to the network, ready for gas to begin flowing through it.

Steve Ellison Senior, Project Manager, National Grid: “I have been massively impressed with how the whole insertion operation has been managed from design through to completion. The engineering and thought that has gone into every element from the pipe distribution, alignment, pipe movement system through to the insertion design and process is second to none. The commitment from the team including some who have been away from home for a long period is commendable. Well done!”

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