Joint Sealing

Joint sealing

A method of sealing leaking joints in gravity pipelines using a packer which combines the functions of leak testing and grout injection. A packer with inflatable end elements is positioned across a pipe joint and pressurised to isolate the joint. Air or water pressure is then applied to the centre section of the packer and the rate of pressure loss through the joint is measured. If the loss exceeds a specified limit, a sealing resin compound is injected into the joint through the packer and the joint is re-tested. The grout combines with the ground around the leaking joint to form an impermeable mass, preventing leaks and enhancing structural stability.

 

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Test results

The following joint sealing products have passed the short term hydrostatic test:

Seerseal [2002]

Unicrete [2002]