Water & Wastewater Treatment

WWT June 2019

Water & Wastewater Treatment Magazine

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Page 32 of 47

The Knowledge www.wwtonline.co.uk | WWT | JUNE 2018 | 33 Making pipeline construction projects effective and sustainable The use of recycled pipe bedding and connections to development on brownfield sites are two ways in which plastic pipes can be brought to bear in a sustainable way BY RICHARD EDDY, CIVILS AND UTILITIES CHAIR, BPF PIPES GROUP A s part of its com- mitment to finding sustainable and practical solutions for the construc- tion sector, the BPF Pipes Group develops guidance on pipes and fittings for drains and sewers and water supply applications, including instal- lation in brownfield sites and, most recently, for the correct choice of recycled aggregates. The latest guidance pro- vides clear information on using responsibly recycled aggregates for sustainable construction projects, includ- ing drains and sewers in small to medium-sized development sites. The BPF Pipes Group is pleased to support the house building industry in offer- ing sustainable solutions to managing the risk of using aggregates from waste. The new guidance recommends that recycled aggregates are always sourced from producers who are able to demonstrate that their products comply with both BS EN 13242 and the WRAP/Environment Agency Quality Protocol for the production of aggregates from inert waste. By selecting processed recycled aggregates, develop- ers can further promote the circular construction economy, without compromising the performance of below ground pipes. Below-ground flexible drain and sewer pipes are typi- cally installed with a granular bed and surround material. Granular material is o‹en referred to as 'aggregate' in the wider construction industry. When installed following industry best practice, it can provide long-term continuous structural support along the entire pipe length without causing any damage to the pipe. Coarse aggregate should always be selected in a size or grade appropriate for the pipe diameter being laid. There have been two key considerations to clarify when selecting recycled aggregates: the environmental suitability of the material when used be- low ground, and its engineer- ing suitability in providing continuous structural support to a pipe. The UK highways and water industries have different requirements, and the BPF Pipes Group guidance

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