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double containment pipe

 

Double containment piping - the safe solution
Increasing emphasis is now placed upon companies and organisations to meet their obligations to the workforce and to the community. Handling Corrosive or hazardous sustances poses a threat to employees and to the environment if there is a risk of spills or leaks from pipework.

In conjunction with the many other measures that must be put in place, double containment piping provides a complete system designed so that leaks are safely controlled, detected and an alarm or visible indication given to warn of the problem. Once identified, the leaking system can be safely drained and repaired without the risk of accident or an environmentally damaging spillage.

 

Why use plastic double containment?
Industrial plastic piping is widely recognised as a superior product when used to handle aggressive, corrosive or hazardous liquids under pressure. The materials used rival metal systems in respect of chemical resistance and cost-effectiveness. Plastic piping is strong, lightweight and easy to install - and it remains effective in use over a long lifetime.

Plastics are also easy to fabricate and assemble using simple techniques such as solvent cement welding or heat fusion welding. Because of this they can be configured into a double containment system without difficulty, and site installation is straightforward, both above or below ground.

 

Effective control and detection of leaks
Systems are designed and manufactured to have a high structural integrity on both the primary (carrier) pipe and the secondary (container) pipe. The annular space between the two pipes collects any fluids that have discharged within a pressure-tight cavity. Once this has occured, an alarm is raised and the leaking system is shut down until it can be drained and repaired or replaced.

Double containment systems can accomodate a number of leak detection methods. One common method is to divide the system into zones that are each fitted with a liquid sensing device (such as a float switch), or a device to detect pH or pressure changes. Simpler still is the incorporation of clear sections into the containment piping or at low (drain) points in the system. Where early alarm is paramount, a detection cable may be passed through the annular space between the carrier and container pipe. This cable both detects conductive liquids and pinpoints the origin of the leak.

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