Ministry of Defence

Background to specification

RAF Kinloss in Scotland, home to the Nimrod fleet of long-range maritime patrol, defence and rescue aircraft, was to be installed with gravity pipework with an as-built cost of £1.5 million, featuring a stormwater attenuation system to replace existing drainage into Findhorn Bay.

The system to be installed by contractors AMEC for AMEC-Turner under a framework agreement for the MOD had a design brief calling for an attenuation main at the airbase capable of retaining 2000 cubic meters of effluent.

One of the telling factors in choosing Tubosider was its wide range of pipe and tank sizes (from 0.3m to 3.6m diameter) manufactured in thicknesses from 1.5mm to 3.5mm, allowing solutions to be tailor made to match any project.

The galvanised steel has a design life of 50-60 years in non-aggressive environments, and our gasketed joints are fully tested and WRc approved to sewers for adoption standards or watertightness.

Key criteria

The original design involved a single leg 2.2m tank running for several hundred meters, the largest diameter pipework yet used by Renfrew based AMEC site manager David Mackenzie.

However, rock was hit early in the project, greatly affecting the depths to which AMEC could work, and requiring Tubosider to devise a complete new set of plans to overcome the problem.

“The £300,000 solution arrived at now, specially designed by Tubosider UK, has a combination of large 2.2m diameter tank connecting with a series of 1.2m runs and a four leg manifold at either end, all to accommodate the difficult terrain at Kinloss,” said David Mackenzie.

Solution & benefits

“The underlying rock meant AMEC had to move water from one area to another, and also allow for the variations in its depth, but the Tubosider system still began installation on schedule.”

Tubosider also helped the original design by proposing that the penstocks be incorporated into its system rather than be mounted separately, saving the cost of two new chambers.

Furthermore, AMEC used an interlocking box system from the ground forces hire fleet to install the pipework, which allowed 30 meter sections to be laid in six bays all at one time, and completely avoiding any ingress of materials.