TPi September 2015

products & developments New seal design reduces risk of concrete ingress for integrated pipes

Trelleborg’s pipe seals operation has developed the new Forsheda 165 integrated concrete pipe seal design, which reduces the risk of concrete ingress during pipe manufacturing and improves sealing performance. Using a co-extrusion method, the new seal features a slurry lip made of soft rubber – 50 International Rubber Hardness Degrees (IRHD) – for improved flexibility. The enhanced profile of the seal ensures a more secure fit against the pallet, removing the risk of leaking concrete and unnecessary pallet cleaning. The forming parts of the seal are made from hard 70 IRHD rubber to increase stability and grip. Julian West, product manager at Trelleborg’s pipe seals operation, commented, “The correct design of an integrated seal within a concrete pipe is vital for its installation into the pipe and its placement into the ground too. “If the seal is not designed to the right rubber stiffness, it can compress under pressure when being fixed onto the pallet. Similarly, if it is not stable, the vibration that is applied to the concrete as the mould is filled can cause the seal to be displaced, or even lift off the pallet. “Once the seal is in place within the pipe, it cannot easily be moved or replaced. It is therefore vital that the seal performs exactly as required, first time, to avoid unnecessary loss of time and money associated with pipe scrappage.” The Forsheda F165 seal provides benefits for pipe manufacturers, installers and specifiers. It is easier to stretch and accurately position onto the pallet, reducing the risk of compression or bouncing. The rubber’s optimised stability during concrete vibration ensures more accurate socket dimensions and lower scrap rates.

Trelleborg’s new F165 integrated seal

The optimum jointing force of the F165 seal makes it suitable for mechanised pipe laying. This improves health and safety on-site, as fewer installers are required to be in the trench during installation. In addition, the seal offers near zero push-back and excellent jointing even at low temperatures. Mr West continued, “We are aware of the fact that the performance of the seal can also be affected during packaging and delivery. “To prevent the seal warping or misshaping, we only pack them once they have reached a suitable temperature. “We also limit the number of seals per box to ensure they arrive ready for pipe production in the same condition as they left the factory.” The new F165 seal complies with EN 1916, EN 681-1 and German legislation QR4060.

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• EN 10294 • EN 10305 • EN 10216 • EN 10297 • EN 10210 • API 5L • ASTM A106 • ASTM A179

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Trelleborg – Sweden www.trelleborg.com

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September 2015 Tube Products International