Cherne® PROVING RING, 12 IN. 7.5% Deflection, SDR 35

The Cherne® Proving Ring, 12 in., 7.5% Deflection, SDR 35 (part #73288) is a precision ring used to verify the size of a 12" SDR 35 deflection gauge (mandrel) before deflection testing. Passing the mandrel through the proving ring confirms the gauge is at the correct diameter for a 7.5% deflection test, so test results stand up to inspection.

Key Features

• Verifies mandrel sizing — proves the deflection gauge diameter is correct before it goes down the line.
• Matched to 12" SDR 35 pipe at 7.5% deflection — the common maximum-allowable-deflection spec for flexible sewer pipe.
• Supports ASTM-based deflection testing — deflection testing of flexible sewer pipe follows ASTM D3034 and F679 specifications.
• Lightweight and portable — easy to bring to the job site for on-the-spot gauge verification.

Applications

Used by inspectors, engineers, and contractors to certify mandrel size prior to pulling deflection tests on 12" SDR 35 flexible sewer pipe — verifying the pipe was properly bedded and backfilled without excessive out-of-roundness.

Questions on sizing or bulk pricing? Call (866) 514-3684 or email us — we ship within the USA and welcome tax-exempt purchasing for qualified accounts.