PIPE JOINING | MACHINERY
Linking up: developments in pipe joining technology
Recent developments in pipe joining include two projects in Africa – including an enormous wastewater treatment plant – and a selection of new products showcased at K2022
Pipe joining technologies – of which there are several variants – have recently found use in a number of high profile projects. Pipe welding equipment from Leister has been used in the construction of Africa’s largest wastewa- ter treatment plant – the Bahr Al-Baqar in Egypt. Because water from its main river – the Nile – is
limited, and very little groundwater can be reused, the government is focusing on wastewater treat- ment projects. The goal is to purify and reuse the water, to increase productivity in areas such as agriculture. The new plant – claimed to be the largest in Africa – has a daily treatment capacity of 5 million cubic metres of water. The contract to produce and install spiral-wound PE100 pipes was awarded to Egyptian company Krah Misr. The pipes were made from plastic BorSafe HE3490-LS, a PE100 from Borealis. The advantages of PE100 for the application are its low installation and maintenance costs due to its
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resistance to corrosion and chemicals. Krah Misr supplied and installed 2.7km (1.7
miles) of spiral-wound PE100 pipe, in diameters ranging from 1.6m to 2.5m. Originally, project completion was estimated to be 18 months – but the pipes were laid and welded in seven months. The 6m-long tubes were welded together to
ensure tightness, stability and resistance to leaks. Because they were laid on a very loose clay soil – which is subject to considerable settlement – they had to be specially welded. So, in addition to traditional electrofusion welding, they were also welded from inside and outside with Leister extruders. To finish the project in seven months, Krah Misr doubled the number welders and used a total of 24 Leister extruders. Leister’s Fusion 3 and Fusion 3C extrusion welders were used. Krah Misr’s staff were familiar with them – having used them for several years. In addition, the products are specifi- cally designed for large plastic tubes.
Main image: Leister pipe welding
equipment was used in the construction of the Bahr Al-Baqar wastewater treatment plant in Egypt
� November/December 2022 | PIPE & PROFILE EXTRUSION 37
IMAGE: LEISTER
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