WET News

SEPTEMBER 2015 WET NEWS 13 Radically reduce leakage & pipeline fatigue Uncontrolled pressure transients can be highly damaging to water and wastewater network infrastructure leading to pipe fatigue and leakage. Quantum Engineering Developments (QED) are specialists in supplying and installing surge control systems to bring pressure transients to safe levels. Benefits of controlling water pressure surges: • Substantially reduces the risk of pipeline fatigue and bursts • Limits the risk of contamination in water pipes created by negative pressures • Ensures compliance with Pressure Equipment Directive & DWI regulations • Improves your company's health, safety & environmental record and corporate reputation Contact QED to find out how your network can be better protected. Call 01527 577888 or email sales@quantumeng.co.uk www.surgevessels.co.uk HIGH PERFORMANCE PUMPING - FOR HIGHLY DEMANDING JOBS • High Head and High Volume Pumps • 24/7, 365 days a year from nationwide depots • Heavy duty build At Sykes Pumps we possess the broadest range of equipment available, from general purpose pumps to silenced, submersible and high performance units, ensuring that whatever your pump hire need we have a model that can help you. For those really challenging applications our range of High Performance Pumps are the the best available and can be used in environments such as mines & quarries, the marine industry, power generation, civil engineering projects and, of course, the water and wastewater industry. Any applications where high heads and/or high flows are required these pumps will deliver. WWe are continuously developing and improving our range of pumps to meet the ever increasing challenges our customers face and our newest addition to the fleet, the HS200 Super Silenced unit, delivers the power and performance needed whilst still operating at reduced noise levels and lower emissions. Constructing the timber heading at the Fisherman's Walk SPS Installing the 100mm diameter lining at Fisherman's Walk SPS was dismissed. Ultimately, having completed a ground investigation over the site, which showed the ground comprised made ground over water bearing gravels over chalk, it was decided that even the use of a timber heading to install the new pipe would not have been safe as the temporary tunnel would have been in the water bearing gravels and therefore a high risk strategy. It was therefore decided that there was no other option than to remove the tenant from the property to allow for the pipe replacement from within the property. Structural integrity To allow for the pipe to be replaced significant underpinning works needed to be undertaken as digging straight down onto the pipe was also not a safe option and it would also ensure the structural integrity of the terraced property into the future. Wessex Water's in-house structural design team completed an underpinning design. The design consisted of 37 concrete filled steel piles tied into a number of cast in-situ C35 concrete beams each 400mm wide and 1,000mm deep. The underpinning included 30m3 of concrete. On completion of the underpinning the ground floor of the property was completely renewed to meet current Building Regulations. Once the structural underpinning was completed, the defective concrete pipe was broken out and a 600mm Ridgisewer pipe was installed in sections. This pipe was used because of its lightweight and easier access within the property's limited working area. However, using the Ridgisewer pipe was only possible provided that, subsequent to installation, a structural liner was also installed over the pipe length. Ashley Williamson, the Wessex project engineer in charge of the scheme, contacted Onsite's Richard Wortley to ensure that such a lining was possible and to discuss the potential lining options. Ultimately, a 60m length of 16mm wall thickness Premier Pipe CIPP structural liner was installed from an existing manhole at the front of the property using hot water cure techniques. The lining operation was completed in just four days. Overall, the cost comparison between the diversion option and the renovation option, even with the huge amount of property underpinning required, showed a saving of some 40% (£181,000). These are just three of the challenging projects that have been undertaken by the teams at Wessex Water over recent times. Onsite says they show the diversity of expertise as well as the open-mindedness of the teams in finding the creative solutions needed by the range of defects and circumstances that have to be managed when the call comes in about what to the caller is a simple sewer problem.

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