Single-size cured-in-place (CIP) liners for manholes were developed to improve efficiency by reducing time and effort required to rehabilitate a manhole without the need for excavation. A proposed new ASTM standard on such liners is currently being developed by ASTM International Committee F17 on Plastic Piping Systems.
    
ASTM WK36573, Practice for the Installation of a Single-Sized Cured-in-Place Liner for Manholes Having Various Sizes, is under the jurisdiction of Subcommittee F17.67 on Trenchless Plastic Pipeline Technology.
    
According to Brian M. Rohan, P.E., a consultant and chairman of the task group developing ASTM WK36573, 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-size, resin-saturated textile liner tube and inflation bladder that are expandable as a unit to press the liner against manhole walls,” says Rohan. “The single-size 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.
    
All interested parties are invited to join in the standards developing activities of F17.