Single-sized cured-in-place liners were developed to improve efficiency by reducing time and effort required to rehabilitate a manhole without the need for excavation.

The practice for installing single-sized cured-in-place liners of varying sizes for manholes is under the jurisdiction of subcommittee F17.67 on trenchless plastic pipeline technology.

Chairman of the task group developing the new standard (ASTM WK3657) Brian M Rohan says the proposed standard will apply to all shapes and types of manholes, wetwells, catch basins and similar structures.

“Rehabilitation is accomplished by using a single-sized, resin-saturated textile liner tube and inflation bladder that are expandable as a unit to press the liner against manhole walls,” says Mr Rohan.

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“The single-sized stretchable liner and expandable bladder fit the varying dimensions found in almost every manhole.”

Once it has been approved, ASTM WK36573 will be useful to owners of buried utility systems such as municipal sewers, telecommunications, power and similar systems.