Articles & Case Studies

Plastic Solution is Number One Choice for £15 Million Project in Yorkshire

Posted: Wednesday 7th May 2008

An innovative water management solution has been chosen for a £15 million project that will increase the process capacity of the waste water infrastructure serving York and the surrounding area.

As part of the five-year £250 million AMP4 investment programme by Yorkshire Water, contractors Black and Veatch are working in partnership with technical consultants Arup to deliver the maintenance scheme at Naburn Waste Water Treatment Works (NWWTW).

The 23-month maintenance scheme will use Weholite - a high-density polyethylene (HDPE) pipe manufactured by Asset International (Asset) – instead of concrete and ductile iron pipes on large areas of the site.

The scheme involves changing the existing process from a Sequence Batch Reactor (SBR) to an Activated Sludge Plant (ASP). This will improve its efficiency to ensure compliance with the effluent consent figures enforced in 2000.

Black and Veatch site agent, Simon Hempsel, said: “We selected Weholite for this particular project because unlike other products it offered a variety of pipe bends and fittings. In addition, the pipes could be manufactured and delivered to site in line with the required project programme dates.”

Utilising some complex arrangements of Weholite pipe ranging from 450mm to 1,650mm in diameter, the product connects the ASP lanes to the final settlement tanks before connecting the final settlement tanks to the outfall.

Project Manager, Phil Press of Arup - technical consultants for Yorkshire Water, added: “The light-weight nature and flexibility of Weholite also provided health and safety advantages. The easy handling and joining of the pipes reduced the amount of time workers spent in the trenches during the installation process.”

Certain restrictions on-site also meant that only specialist solutions and products could be used, as Gerry Smith, solution manager at Yorkshire Water, explained: “Site space was at a premium and the lightness and flexibility of plastic Weholite pipe avoided the need for costly lifting equipment and the speed of installation was therefore quicker.”

Simon Thomas, managing director of Asset, commented: “Our design to manufacture time is significantly lower than other materials as we manufacture to exact specifications and deliver to a specified deadline.

“The design specifications required of the Weholite pipes for this project were complex and challenging; however the product was delivered to site on time and within weeks of the order being placed. The swift installation in difficult conditions also contributed to significant time and cost savings, compared with other traditional products and materials”.




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September 2019

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