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Deflection Testing
 Deflection Testing of new PVC Sanitary Sewer Pipes
Williams Testing provides independent deflection testing on new pipes ranging in size from 6” up to 24” in diameter.
On new construction projects, it is normally required that all sewer lines are tested for deflections. This type of test is often referred to as either a Deflection Test or a Mandrel Test.
The test is usually performed after placement and compaction of trench backfill and prior to restoration of the surface. The pipes must be clean. The Mandrel must be rigid, equal to 95% (this measurement may vary depending upon the sewer district) of the average diameter of the pipe diameter to be tested. The test is performed in accordance within the guidelines of the local and prevailing sewer authority and under inspection by a local utility inspector and engineer.
The Mandrel Test is conducted by pulling the test device through a completed sewer run from Manhole to Manhole. If the Mandrel gets caught in the pipe and cannot be pulled from Manhole to Manhole in a straight pass, then the line will fail the Mandrel Test.
Williams Testing provides Rerounding services to correct oval/deflected PVC Pipe. See information on the Rerounder.
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