Pipes, valves & fi ttings
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electing the appropriate piping material is crucial for creating effi cient and dependable infrastructure, helping buildings reduce
operational costs and maintain high-performance water and heating systems. While copper has long been favored for its stability, strength, and thermal properties, fl exible plastic piping emerged in the 1980s, winning over professionals with its ease of installation and inherent characteristics. More recently, a third alternative has emerged in the market. Driven by key factors such as cost-effi ciency, reliability, and installation simplicity, project teams are increasingly adopting multi-layer pipes – a durable, fl exible, and value-enhancing solution for building services across various project types.
A proven technology
Multi-layer piping is not a new technology. The fi rst multi-layer composite pipes were introduced to the UK market more than 40 years ago but for a long time were used primarily in industrial applications. Noticing its effi ciency, durability and fl exibility, plumbers and installers are turning to multi-layer piping to overcome many challenges identifi ed throughout the specifi cation and installation process for modern buildings. A multi-layer piping system typically consists of
three layers. In the case of Geberit FlowFit, there’s a central aluminium layer which makes the pipe strong yet fl exible, with a plastic (PE-RT) layer either side of this to resist corrosion and ensure a smooth internal bore. Each material brings its own performance benefi ts. The aluminium layer, for example, off ers the mechanical stability necessary to ensure that the pipe remains in position but also fl exible enough to enable it to bend into the required position. It also provides the pipe with an oxygen diff usion barrier, making it suitable for central-heating systems and ensuring it is detectable by electronic devices following installation. The polyethylene inner layer renders the system
resistant to cracking, ageing, and general wear and tear. Its non-reactive and corrosion-resistant nature
Multi-layer piping: the third wave in plumbing and heating
For decades, the plumbing industry has debated the merits of plastic versus copper piping. However, a third option has been gaining traction among installers for hot and cold-water systems. Antony Corbett, product applications engineer at Geberit, explores the advantages of multi-layer piping technology
makes it suitable for all water qualities. Furthermore, the low internal surface roughness of the inner layer impedes the adherence of limescale and biofi lm to the smooth surface, providing resistance to scale build-up.
Combining the benefi ts of copper and plastic
For a long time, the argument for copper piping systems has been focused on durability and strength, while plastic’s fl exibility and lightweight properties has won followers elsewhere. Multi-layer piping combines these benefi ts in one easy-to-install system. Its composition protects against potential leakage, while also enabling it to be cut and manipulated on site, for example to bend around architectural curves. For larger diameters, bending is still possible with specialist tools, without the risk of de-lamination or kinking. Multi-layer piping systems also off er acoustic insulation properties, resulting in reduced noise during water fl ow compared to metal piping. Furthermore, fi ttings are manufactured in such a way which means reduced turbulence during water fl ow – and that’s where the noise typically stems from in other systems.
Installation ease
Opting for multi-layer piping over copper brings obvious installation benefi ts, eliminating the need
16 August 2024
for hot works on site and speeding up installation times. However, multi-layer piping that harnesses press-fi t technology extends these benefi ts even further.
Geberit FlowFit fi ttings come in eight dimensions,
and only two pressing jaws are required for the entire range. This approach eliminates the need for frequent tool changes. The fi ttings and jaws are colour-coded to indicate which tool should be used, aiming to provide an intuitive user experience. After pressing, an indicator detaches from the fi tting, allowing for easy identifi cation of any unpressed fi ttings. This not only speeds up installation times but does so without compromising the integrity of the fi tting, giving installers peace of mind.
Embracing sustainability
Multi-layer piping systems also off er considerable environmental benefi ts. These fully recyclable systems help reduce a building’s carbon footprint. Their light weight and low scrap value decrease transportation emissions and discourage potential theft from construction sites. Moreover, the superior thermal insulation properties of multi-layer pipes minimise heat loss, enhancing energy effi ciency. Thanks to their corrosion resistance and smooth internal surfaces that prevent scale accumulation, these piping systems boast an extended lifespan, further contributing to sustainability.
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