Hat Liner Packer

Published: April 30, 2018 | Last updated: July 5, 2023

What Does Hat Liner Packer Mean?

A hat line packer is a pipe repair/rehabilitation tool that is used mainly for the repair of pipe lateral connections and branch/joint connections. The packer is an inflatable hollow rubber tube that allows for the installation of resin saturated felt hat patches. The hat liner packer together with the felt hat is used to restore the structural integrity of pipe connections.

Hat liner packers may also be used to install regular resin impregnated pipe liners as well.


Trenchlesspedia Explains Hat Liner Packer

Unlike regular flexible packers, hat liner packers are designed to repair pipes at hat profiles or T-shaped junctions. The hat liner packer is first fitted with the resin-saturated felt hat patch and inserted into the main sewer pipe via compressed air rods. Once the packer reaches the junction in question, it is inflated with compressed air, inverting the felt hat in the process. Upon completion of the inversion process, the pressure in the packer is maintained until the resin is fully cured. Once the resin has reached sufficient hardness, the packer is then deflated and removed from the pipeline.

The rim of the hat packer seals the interface between the two pipes, while the longer part of the hat partially seals the branch pipe.


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