Mandrel 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. It ensures that new lines have been installed and bedded properly. Mandrels are assembled to the appropriate size and drawn through the lines to verify that the line’s internal dimension meets the required specification.
Thuro’s light-weight aluminum deflection gauges utilize a nine-fin configuration which conforms to accepted practice for mandrel design. This allows for the passage of sewage when testing live sewers. Thuro proving rings are designed as Go + No Go devices that easily verify that each deflection gauge is within tolerance. They incorporate both oversize and undersize testing dimensions and are plated with corrosion resistant zinc.
Thuro proving rings manufactured for use in The City of Calgary are each stamped with a unique serial number and receive individual approval for use in writing from the City of Calgary Water Resources – Research, Policy and Standards Team.
Thuro Inc. both manufactures and utilizes these deflection gauges. Please call for more information on ordering your set of mandrels or for a quote to have your PVC sewer pipes tested.