Articles & Case Studies

Saint-Gobain Pipelines’ natural solution provides added protection for new trunk main

Posted: Monday 4th February 2008

Saint-Gobain Pipelines’ PAM Natural has been specified for a 7.6km water trunk main running through urban north London. The design and build project to install the pipeline is being carried out by Clancy Dowcra for Three Valleys Water, a Veolia Water UK company.

The work for Three Valleys is an SEMD (Security and Emergency Measures Direction) project that ‘twins’ an existing pipeline to cope with additional demand and cater for the increased pressures that the older pipeline is unable to cope with. The pipeline runs through Barnet from Totteridge to East Finchley and while some 1500m runs through an area of public open space, the majority of the work is being carried out in predominantly residential areas and on some community roads.

Ease and speed of installation determined the choice of a ductile system with push-fit jointing catering for the numerous short lengths in the pipeline. Anchor gaskets have also been used to avoid the need for thrust blocks in the limited space available.

Suitable for more than 86% of all UK soil conditions, PAM Natural has an 85% zinc/15% aluminium alloy coating which provides active protection for the ductile iron pipe. The zinc actively protects the ductile through galvanic protection whilst the presence of aluminium significantly decreases the rate at which the zinc is transformed to provide galvanic protection. The pipe is finished with a blue epoxy coating that allows for the galvanic action of the underlying alloy whilst retaining robustness and durability.

Further information on Saint-Gobain Pipelines can be found at

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