Water & Wastewater Treatment

The PumPing STaTion - PumP and ValVe SuPPlemenT 2016 13 In Depth: Valves and Leakage Decreasing network pressure to minimise leakage F ixing and minimising the number of leakages within the water network is currently a major priority for the UK's water companies. Although most companies are working hard to reduce leakages caused by problems such as ageing mains, leaking joints, substandard valves and pressure surges within pipes, a large proportion of the system still remains in poor condition. According to the World Bank, $14 billion (£10 billion) is lost each year in clean water that's wasted before it even reaches its point of consumption. Water loss is oƒen referred to as non-revenue water (NRW) and is categorised as water that has been processed within the network but never actually reaches the customer. This can be as a result of 'real' losses such as leakages, but can also occur from metering inaccuracies and unbilled authorised consumption from emergency services such as the fire and rescue service. High levels of NRW are detrimental to the water industry as it creates substantial financial losses, which ultimately puts extra pressure on paying customers. In the UK, leakages are a particular concern that requires attention as the Consumer Council for Water found the majority of people (70%) do not think water companies are actually doing enough to prevent this issue. What causes leakages to occur? There are a number of reasons why leakages occur on the pipe network. It could be that there are gaps along sections of the network where pipes join, and as a result, water can escape. Gaps can also occur when the pipes age over time and begin to deteriorate. With reducing leakage a priority for UK utilities, calming the network with the correct use of valves can make all the difference, writes Mark Hodgens By Mark Hodgens managing director, Talis uK

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