Articles & Case Studies


Posted: Monday 1st April 2013

Radius Systems are currently supplying innovative pipeline solutions for two large diameter water projects: a new hydro electricity scheme in Gerlan, North Wales and the rehabilitation of a large diameter pipeline in the Severn Trent Water area.

Working together with the Derwent Hydro project team to develop an optimised system for the new hydro electricity pipeline in Gerlan, Radius Systems are currently supplying over 2.5km of 710mm black PE100 pipe in standard and bespoke SDRs, with a range of fittings adapted to suit. The pipeline conveys water from two separate water courses, which are at different inlet heights, the highest of which is 136m above the turbine inlet. Three pipe SDRs were supplied, including SDR12.4 a 14 bar pipe, which was selected over standard SDR11 16 bar pipe. The pipes were specially manufactured with a view to optimise the system’s hydraulic performance, minimise material usage and reduce the impact on the environment.

In the Severn Trent Water area, Radius Systems have worked closely with Laing O’Rourke to engineer a solution for a strategic 39” metallic pipeline. 9.3km of 937mm dark blue PE100 pipe with an SDR of 51 has been specified to be inserted as a liner into the metallic host main, using a pipe-folding technique to reduce its’ diameter. Once in place, the pipe is pressurised to achieve its’ final dimension. The PE pipe ensures water quality and leak-tightness and acts as a semi-structural liner deriving its’ strength from the main. Brent Eastell design engineer for Laing O’Rourke commented: “this is one of the largest and most innovative projects we are involved in at the moment. Relining the pipeline has brought considerable material and installation cost savings to Severn Trent Water, compared to replacing the whole metallic pipeline. Choosing a pipe insertion technique has also kept disruption to the environment to a minimum”.

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