Water & Wastewater Asia March/April 2024

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IN THE FIELD Repairing a suspended pipe within 30mins By Bertrand Gonthiez, Mueller regional sales manager for Europe 1 2 Sébastien Picollo is the operations manager for SATEG — a subsidiary of SAUR — which distributes drinking water to more than 35,000 subscribers in nearly 200 municipalities in the Pau region, located in southwestern France. SAUR manages six drinking water production plants supplying several large reservoirs with 8.5 million m 3 of water produced per year in the area. The water distribution network includes 1,200km of cast iron and asbestos cement pipes of DN100, DN150 and DN200, then in polyvinyl chloride (PVC) for the smallest sections of DN60, DN90 and DN110. REPAIR IN THE ARZACQ-ARRAZIGUET VILLAGE Arzacq-Arraziguet is a French village with 1,093 inhabitants, located in the Pyrénées-Atlantiques department in the Nouvelle-Aquitaine region. SATEG was notified of a leak that had occurred on a pipe running alongside a bridge and crossing a river. The pipeline was suspended with accessibility constraints. The aerial part of the pipeline was made of DN200 steel and is part of an asbestos-cement network for the most part. The leak, that was visible from the road, had a flow rate of 15m 3 /hr under 11bars of pressure. It was not possible to shut off the water from the network as it supplied several nearby farms and emptying the pipe was not 30 Water & Wastewater Asia | March-April 2024
IN THE FIELD an option. The challenge was to reduce the time of service interruption for the users concerned by repairing the leak quickly and safely, while taking into account the access constraints of the pipeline suspended from the bridge. To do this, an aerial work platform was used to work at height and in complete safety. The works department had two other leaks to attend to on that day and so they needed to make this repair as quickly as possible and move on to the next. SATEG chose to use the Repamax permanent repair sleeve by Krausz for its ease of use and reliability in high pressure situations. This repair sleeve comes in sizing ranging from DN40-DN1800. In this case, the 210mm width was the best fit. While this repair was used for a steel pipe, it can also be used on asbestos-cement pipes. Also, the radial closing design and sealing systems helped eliminate installation errors. “As the pipe was still under pressure, speed and ease really mattered,” added the operations manager. The repair sleeve has a hydraulic pressure-assisted gasket that inflates as water pressure increases. This allows for 3° of dynamic deflection on each end to reduce the risk of future damage to the pipe due to heavy traffic on the bridge and temperature changes. As it is weld-free and 100% stainless steel parts, the repair sleeve is resistant to corrosion. Safety is an important aspect of pipe repair. Good equipment can make all the difference and reduce the time that field crews spend in potentially harmful situations. Picollo said, “This repair sleeve gave us the ability to make the repair safely and easily, within half an hour.” The repair sleeve can be applied in several different ways. It can be stabbed fit to connect pipes or it can be wrapped around damaged sections to repair the pipe. This flexibility gives installers the option to either connect or repair a range of water and wastewater piping types. This multifunctionality — together with wide tolerance — reduces inventory costs and saves shelf space as the product suits a wide range of pipe diameters, eliminating the need for dedicated wrap-around and coupling products. Images: SAUR 1 Leak on a pipe under a bridge in Arzacq-Arraziguet 2 Aerial work platform was used to work at the right height and in safety 3 The HYMAX Repamax in place after a half hour of work Without the Repamax, the pipe would require welding, which was not possible since the leak was located at a low point in the network without the possibility of draining the pipe. It was therefore not an option to weld with water in the pipe. This repair sleeve was best suited to both access constraints and minimise the disruption of water service for customers. REPAIR SLEEVE MAKES FOR A QUICK AND EASY INSTALLATION Picollo said, “The application of Repamax is simple, unlike the old sleeves that we used before that were designed with a rigid rubber gasket that did not guarantee a perfect seal. We are happy with it.” The light weight and clamping system on the repair sleeve meant repair crews could handle it without any real support. 3 Water & Wastewater Asia | March-April 2024 31
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