CamStopper
Introduction
The Camstopper offers a simple and improved method of installing and removing a drain stopper. That reduces the time involved in the procedure of installation and retrieval, and the number of entries required into a manhole or confined space.
The product uses a pivoting cam system to expand a traditional drain stopper whereby a rubber seal is forced onto the pipe wall causing temporary sealing of the end of an open pipe, duct or drain.
Standards
No specifications or product standards exist for drain stoppers. BS EN 1610 and BS EN 752 are the European standards for the design and construction of gravity sewerage and drainage systems. In drafting the testing schedule and claims for the Camstopper, account is taken of the requirements of these standards.
Sheffield Hallam University (SHU) has undertaken independent pressure testing of the Camstopper product range. The claims of this and the SHU report have been independently verified and tested by the Water Research Centre (WRc).
The Camstopper product has been granted approval by WRc under the 'WRc Approved TM' certificate number PT/266/0903.
Test Results and Conclusions
- In pressure tests against the traditional wing nut stopper, when set in opposing ends of a common test pipe, the Camstopper always withstood a higher pressure before peak movement. The traditional plug usually fails by twisting. The Camstoppers 'twist' is restricted by the locating heel set in the pipe invert or crown.
- The 100mm Camstopper will withstand 0.5 bar internal pressure (unsupported) when installed against a pipe surface of glazed or unglazed clay.
- The 100mm Camstopper will withstand 0.4 bar internal pressure (unsupported) when installed against a pipe surface of plastic.
- The 150mm Camstopper will withstand 0.4 bar internal pressure (unsupported) when installed against a pipe surface of glazed or unglazed clay.
- The 150mm Camstopper will withstand 0.3 bar internal pressure (unsupported) when installed against a pipe surface of plastic.
- The Camstopper can be used to seal plastic pipes subjected to less than or equal to 6% diametrical deformation, the Camstopper can be expected to withstand 0.2 bar internal pressure at 6% deformation.
- The Camstopper can be installed up to 6 times quicker than a standard stopper and retrieved up to 20 times quicker in a 900mm deep inspection chamber. In deeper chambers, the time saving increases further.
- The operator does not have to enter the manhole to retrieve the Camstopper providing a rope is attached during installation.
- The Camstopper can be used to surcharge a chamber by sealing the outlet pipe, providing a rope is attached during installation. The pressure rating is the same as if the Camstopper were located at the inlet.
- The 100mm Camstopper can be fitted up to 50mm from the end of pipe.
- The 150mm Camstopper can be fitted up to 500mm (arms length) from the end of a 150mm pipe.
- The Camstopper is body made from durable glass filled nylon.
- The rubber seal is made from commercial grade rubber suitable for temporary use in sewage environments.
- The resting diameter of the 100mm Camstopper is 96mm
- The optimum range of the 100mm Camstopper is 97 to 103mm
- The actuated diameter of the 100mm Camstopper (unrestricted) is 108mm
- The resting diameter of the 150mm Camstopper is 146mm
- The optimum range of the 150mm Camstopper is 147 to 153mm
- The actuated diameter of the 150mm Camstopper (unrestricted) is 158mm
- The Camstopper can be installed up to 1000 times without any deterioration in its function or performance.
- The Camstopper is resistant to impact damage when dropped from a height of less than or equal to 3 metres.
View a video of the Camstoppers in action
Video1 (3meg)
Video2 (3meg)
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