providing a PAM integral ductile system.

The piping was chosen for the United Utilities Alderley Edge facility after alternative material selected

for one stretch of pipeline required additional engineering.

David Sheath of engineering consultants, Atkins, said: “Being peat, the stretch of ground we had to

cover was of particularly poor quality for a trenching operation and because of the hydraulics of the

gravity system at the inlet works, the most cost-effective solution was to mini-pipe just below the

surface. The technique we used involved spanning the pipeline on a series of raised plinths, before

sinking it into the ground.”

The ductile system was also selected for its strength and rigidity, which allows it to cover long

unsupported spans and minimise embedment requirements. It is also suitable for installation at a shallow

depth, even where high traffic loads are anticipated, in poor load bearing or unstable ground.

The Alderley Edge project involved the installation of 1400mm and 800mm diameter Integral pipes.

The work was carried out by Amco Donolan on behalf of the project’s main contractors Galliford Costain.

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