Over the years, the precast industry has seen a dramatic change in testing of installed products, especially manholes. The use of vacuum (negative air pressure) testing has gained ground almost everywhere and is now the primary standard by which manholes are tested and accepted. This broad adoption means that more inspections are being performed in a wider variety of conditions. As these conditions vary and include more extremes, both installers, engineers and inspectors find that vacuum testing, like all test methods, has its limitations and cautions.
Press-Seal Vacuum Testing Policy
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