Have you ever found yourself on a project where local codes or requirements specify that vacuum testing of manholes must be done after backfill? We’ve received many calls from producers and contractors or installers faced with this same situation. Can’t really blame the owners. Testing after backfilling provides them with a degree of certainty that a watertight system has been installed. There are three major disadvantages when proceeding with this test:
Understanding the limits of the methodology
Vacuum testing is a quick, safe and practical way to validate manhole system integrity. Manhole sections can be tested at the precast concrete plant prior to delivery or on site prior to backfilling. Following prescriptive guidelines in the ASTM Manual is essential for successful vacuum testing.