“Mandrel” or “deflection” testing is used to determine that the ovality of flexible sewer pipe meets design specification. This testing is critical to the long-term performance of PVC sewer lines being installed today.
Thuro’s light-weight aluminum deflection gauges utilize a nine-fin configuration, allowing for the passage of sewage when testing live sewers. Go + No Go proving rings are used to verify that each deflection gauge is within tolerance. Manufactured for use in The City of Calgary each ring has a unique serial number and are individually approved for use from the City of Calgary Water Resources – Research, Policy and Standards Team.