WET News

JANUARY 2018 WET NEWS 17 PROJECT SPECS • Design and develop a bespoke water management solution • Supply a multi-leg attenuation tank comprising HDPE pipes TECHKNOW • The Weholite HDPE pipe becomes a homogenous pipe line • The 940m³ six-leg tank comprises 2.2m diameter HDPE pipes with fabricated manifolds • Weholite pipe can adjust to different loading conditions, vibrations, stress THE VERDICT "The Kent scheme is BWSC's eighth turnkey biomass power plant project in the UK within the last five years, and the close cooperation with key industry partners, including Asset, has contributed to the successful delivery of the projects" Simon Collins, BWSC Logging on to water attenuation • Storing surface water drainage while avoiding ground settlement proved a challenge during construction of a new CHP biomass plant in Kent. NEED TO KNOW 1 The CHP biomass plant is set to create a secure and sustainable supply of energy for the Sandwich area 2 BWSC sought to integrate a surface water attenuation tank to store surface water drainage 3 The tank must withstand a worse-case load of 420kN on a single wheel of a Liebherr LH50 log loader schemes, Asset was the obvi- ous choice for BWSC when seeking a manufacturer to lend its expertise in bespoke water management solutions for the project. Due to the site's poor ground conditions, BWSC was looking to integrate a surface water attenuation tank to store surface water drainage and avoid ground settlement in the overlying log storage area. To achieve this, Asset provided a comprehensive design service and developed a bespoke solu- tion tailored to the scheme's precise requirements. Con- struction work in connection with the tank was provided by NBC Construction UK. The result was a multi-leg attenuation tank; a 940m³ six- leg tank of 2.2m diameter HDPE pipes with fabricated manifolds at each end and a fully welded system to ensure resistance to impact. The Weholite HDPE pipe, with welded joints, becomes a homogenous pipe line, capa- ble of withstanding any ground settlement without compro- mising its structural integrity. To further combat the issue of poor soil modulus, a geo-grid was installed to increase ground stabilisation and mini- mise settlement. With the tank being posi- tioned under a log storage yard, where it would be sub- jected to heavy loads, it was also important for it to be able to withstand a worse-case load of 420kN on a single wheel of a Liebherr LH50 log loader. Weholite was the perfect solution for this added com- plexity as it has a natural ability to flex, which enables the pipe to adjust to different loading conditions, vibrations, stress and soil movements, without causing damage to the structure. The product's versatile nature and Asset's ability to deliver sections of pipework in a timely manner, enabled it to deliver the project over a two- week scale, saving the client weeks on initial projections. In opting to use Weholite HDPE pipes and attenuation tanks for the project, BWSC recognised the benefits of selecting the lightweight, durable, and abrasion-resist- ant product that is tolerant of ground movements. Crucially, as the products are designed and prefabricated at Asset's South Wales factory and deliv- ered to site in modular compo- nents, there was a substantial reduction in onsite installation time frames. Simon Collins, contracts manager at BWSC, says: "The Kent scheme is BWSC's eighth turnkey biomass power plant project in the UK within the last five years, and the close cooperation with key industry partners, including Asset, has contributed to the successful delivery of the projects." "We have been extremely impressed with the quality of the Weholite product, which has not only effectively addressed our project require- ments, but saved us time and provided Asset International techni- cal sales engineer Matthew Thomas said: "This is a highly ONSITE DRAINAGE A geo-grid was installed to increase ground stabilisation and minimise settlement successful project and has really cemented a strong work- ing relationship between is, our client BWSC and the instal- lation company NBC Construc- tion UK. "Weholite was the ideal solution for BWSC's project W ith a growing global demand for energy and an increasing acceptance that fossil fuels and nuclear power are not only unsustainable but irreversibly damaging to the environment, developing renewable and sus- tainable energy sources has become a vitally important necessity. Asset International is no stranger to renewable energy projects, and has offered its expertise and provided solu- tions to several renewable energy schemes worldwide. Most recently, it provided expertise to Danish engineer- ing and contracting company Burmeister & Wain Scandina- vian Contractor (BWSC) on a surface water attenuation sys- tem for a new biomass power- plant being developed by the company in Sandwich, Kent. BWSC undertook a project to reduce the region's carbon footprint and reliance on imported fossil fuels by pro- viding a secure source of renewable heat and energy through a new combined heat and power (CHP) biomass plant. The new CHP biomass plant is set to create a secure and sustainable supply of energy for the area. Powered by locally sourced virgin wood, the plant will generate approx- imately 27.8MW of green elec- tricity, capable of supplying up to 50,000 homes. Having already supplied smaller diameter pipes to the site for general drainage pur- poses, and with its extensive experience working on suc- cessful renewable energy requirements. The product provides the technical advan- tages of equivalent PE solid wall pipes but with substantial savings in weight, combining greater ease of transportation and installation, with increased cost effectiveness."

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