materials feature | PVC-O pipe


existing systems, the new combination of pipe and seal will improve performance and reduce costs over its lifetime, say the developers. Nomis Sim, CEO at Molecor SEA, said: “The market


has traditionally been dominated by ductile iron pipes, but PVC-O technology like ours enables a much lighter and stronger pipe solution.” The company has begun production with pipes of DN


90mm to 630mm in Malaysia and plans to expand the service into other territories in South East Asia in the near future.


The F-576 Anger-Lock seal is designed with a rubber


Wavin’s Biax PVC-O pipe, in 24m lengths, was joined together to cre- ate a 19km pipeline in the Netherlands


pipe exceeded the quality of traditional pipeline materials. The biaxial stretching process reinforces the pipe material and improves other properties. For WMD, the higher impact resistance, higher pressure resist- ance, lower installation costs and reduced pressure- loss were the main reasons for choosing PVC-O. Other advantages included the lower metre weight compared to other materials, lack of need for welding and ease of installation.


Although a 315mm pipe would have done the job, WMD chose a 400mm pipe because the higher diameter meant that the energy needed to pump the water was reduced in the long term. The second reason for choosing an oversized pipe was in anticipation of future additional capacity. “Although the potential capacity of the pipeline will


not be fully used now, it will in a couple of years,” says André Nijland, Wavin’s manager for technology licensing in North America and Asia. “As the pipeline has a technical lifetime approaching 100 years, the water company has chosen a more sustainable solution.” Biax pipes can be manufactured in any length, as


manufacturing is done by an in-line continuous extrusion process. This means that tailor-made logistical and installation-friendly solutions can be offered for projects. The main advantage of these long pipes was fast


Trelleborg’s 576 Anger- Lock seal forms an


integral part of Molecor’s


Hypro pipe for the Malaysian market


installation. Although installation costs of PVC-O pipes are amongst the lowest, using longer pipes led to further savings, says Nijland.


Malaysian seals Molecor South East Asia (SEA) has teamed up with Trelleborg to develop a new design of PVC-O pipe and integrated seal for pressurised water networks in Malaysia. Trelleborg’s Forsheda 576 Anger-Lock seal, which is made in Malaysia, will be installed into Molecor Hypro PVC-O pipes with a pressure rating of 16 and 25 bar, and ranging from DN 90mm to 630mm. Compared with


24 PIPE & PROFILE EXTRUSION | June 2016 www.pipeandprofile.com


sealing element that is bonded to reinforcing plastic to make a one-piece seal. The soft plastic reinforcement enables easy installation of the seal into the pipe’s socket, either manually or automatically, using special insertion equipment. Martijn Boerma, business development manager for


Trelleborg’s pipe seals operation in the Asia Pacific region, added: “Our F-576 Anger-Lock seals outper- form competitor seals in strength and performance of sealing capability and they also offer a much longer lifetime, making them ideal for use in PVC-O pipes.” The fully retained F-576 has a low jointing force, meaning that it cannot be displaced or lost during stocking transportation and installation. Similarly, it ensures a reliable automatic insertion, unlike other standard rubber seals, says Trelleborg.


Capturing landfill gas Nylon pipe – in this case, nylon 11 – has also been used to connect landfill gas to the local gas distribution system.


Pipes and fittings producer Georg Fischer Central


Plastics in the US has used castor oil-derived Rilsan PA11 from Arkema to make the piping, which was used in a project in Nebraska, USA to collect the gas by BioResource Development (BRD). BRD produces biofuels from renewable resources,


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