American Underground, Inc. uses deflection gauges (mandrels) to test sewer pipe for out-of-roundness or deflection per ASTM specifications D3034 and F679.

This testing ensures that flexible sewer pipe has been properly bedded and backfilled (ASTM D2321) as it’s critical to optimal and long-term performance for newly installed sewer lines.

Our top of the line aluminum gauges utilizes a nine arm (fin) design to ensure the pipe is tested accurately. Because of this unique design, gravel and debris are easily able to pass through. Other gauges can get hung up, causing a deflection test to fail, even though the pipe is within tolerance. Sized to .01″, both deflection gauge styles meet ASTM requirements.

The fin style aluminum deflection gauges are designed to be field verified by inspectors without the need for a proving ring. American Underground, Inc.’s team of trained and experienced professionals will ensure a proper and full inspection through this deflection testing.

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