---
title: Deflection Testing for Pipes
description: We use specialized deflection gauges (mandrels) to test plastic pipe for out-of-roundness or ovality. By using mandrels to conduct a deflection test we can ensure the flexible sewer pipe meets the proper design specification.
---

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# DEFLECTION TESTING

Deflection testing is important because it can help determine if a flexible pipe has exceeded its proper design specifications.  Excessive deflection may lead to harmful strain levels in the pipe wall that can trigger structural failure modes such as cracking, inverse curvature, and wall buckling.

While our CCTV inspections are excellent for visually checking a pipeline it is not adequate for determining the percentage of deflection. Therefore we use specialized deflection gauges (mandrels) to test plastic pipe for out-of-roundness or ovality. By using mandrels to conduct a deflection test we can ensure the flexible sewer pipe meets the proper design specification.

![Mandrel](https://www.calgarysewerscope.ca/hs-fs/hubfs/Mandrel.jpg?width=450&name=Mandrel.jpg)

Mandrel with 9 fins

 

### MINIMIZE RISKS, MAXIMIZE RESOURCES.

Better manage your growing infrastructure needs with the [Progressive Assessment Of the Underground Sewer Environment (PAUSE) Framework](https://www.calgarysewerscope.ca/pause-asset-management-strategy?hsLang=en-ca)

CCTV video sewer line inspections in Calgary, offering sewer line inspections for residential, commercial and municipal properties. 

 

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