Articles & Case Studies

Bespoke drainage solution

Posted: Tuesday 10th March 2015

Extension works at a Herefordshire school have benefitted from a bespoke drainage solution from Polypipe, the UK’s leading manufacturer of sustainable drainage and water management products.

Supply and install partners Keytec Geomembranes specified Polypipe’s popular Ridgistorm-XL large diameter piping system, innovative Polystorm-R geocellular units and a Stormcheck flow control chamber for the bespoke attenuation solution at Leominster Primary School where a new primary school was being developed.

The drainage solution – comprised of 54m of 1500mm diameter Ridgistorm-XL pipe in a twin leg design and a Polystorm-R attenuation tank capable of holding 45,000 litres of surface water – was complimented by an innovative Stormcheck flow control chamber, used to discharge water from the attenuation structure into the existing sewer system at the local water authority’s specified rate of 35 litres per second.

Polypipe’s technical experts were on-hand to advise on the design from the tender stage of the project. This included calculating the stiffness classifications of the Ridgistorm-XL pipes specified to ensure that the system was suitable for the loading above, due to being installed underneath the main access road to the school. The specified strength of the pipe also played an important part in reducing time and excavation costs, allowing low cover levels and enabling the project to be completed in time for the start of the school term.

A key factor in the system’s installation was Polypipe’s provision of on-site attendance. By demonstrating the use of Ridgistorm-XL’s integrated electro-fusion jointing method, Polypipe’s Product Support team enabled Keytec Geomembranes to install the large diameter pipework quickly and efficiently, reducing the need for working in confined spaces while improving site safety.

Geoff Williams, Director & Partner at Keytec Geomembranes, said: “We’ve worked with Polypipe’s geocellular products in the past, and they’re lightweight, easy to install nature is mirrored in their Ridgistorm-XL system. Having the Polypipe Product Support team to work along side Keytec Geomembranes technicians on-site was greatly beneficial, ensuring a smooth and safe installation process.”

All Keytec Geomembranes welding technicians are qualified by TWI to BS EN 13067, approval testing for plastic welders, via the internationally recognised Certification Scheme for Welding Inspection Personnel (CSWIP) including Butt Fusion, Socket Fusion & Electrofusion for large diameter pipes.

Emma Nicholls, Marketing Manager at Polypipe, added: “Our early involvement in this project allowed our water management experts to design a bespoke system, taking all of Keytec’s requirements into consideration. We’re extremely pleased to hear that Keytec Geomembranes have seen the benefits of Ridgistorm-XL’s integrated electro-fusion jointing method, which brings many benefits to applications such as this.”

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