 Image provided by Cherne Industries |
The test is usually performed after placement and compaction of trench backfill and prior to restoration of the surface. The Manholes must be clean. Manhole testing is performed by creating a vacuum in the manhole and monitoring a gauge for vacuum loss. If a loss does occur, then there is likely to be a leak. Leaks need to be located and then repaired. Williams Testing provides chemical grouting to stop leaks in leaking manholes. See Grouting section under Pipe Rehabilitation.
|
