
Heating specifiers and installers are accustomed to working with traditional copper and plastic pipe systems, however MLCP (multi-layer composite pipe) is rapidly gaining popularity as a viable alternative for transporting hot and cold water in residential and commercial plumbing systems. Such pipes offer convenience, speed of installation, and reliability, and are far less likely to be stolen for scrap.
What is MLCP?
MLCP is constructed from several layers of different materials, typically cross-linked polyethylene (PEX) and aluminium.
For example, Uponor’s MLC pipe is engineered with five layers comprising an aluminium core surrounded by internal and external layers of durable PEX. This construction combines the advantages of metal and plastic pipes while eliminating the drawbacks of each material.
The aluminium core acts as a barrier against oxygen penetration, minimises thermal expansion, and provides structural rigidity, enabling a straightforward and secure installation process. Meanwhile, the polyethylene layers make MLCP incredibly durable yet lightweight and flexible. The smooth plastic inner layer also reduces limescale build-ups that can degrade water quality over time.
Benefits of specifying MLCP
MLCP offers several further significant benefits that can save installation time and money compared to traditional metal pipe systems.
A major benefit is the long, flexible lengths of MLCP, which comes in coils up to 500m. This means that far fewer connections are required compared to copper pipes, which must be joined frequently. Fewer connections help maintain the system’s pressure, make the system quicker to install, and reduce the potential for leaks.
The flexibility of MLCP also allows it to be easily routed around obstructions by simply bending the pipe by hand or with basic tools; eliminating the need for numerous elbow fittings and precise measurements that other pipe systems require.
Quick push-fit or press connections are used instead of laborious copper soldering. Not only does this speed up installation, but it also enhances safety by avoiding hot works that require permits.
Unlike copper, which is impacted by volatile metal pricing, MLCP costs are stable over the long term, making it easier for specifiers to cost systems. Furthermore, the lightweight plastic and aluminium construction is considerably lighter than copper, reducing transportation costs and offering greater manoeuvrability on site.
These materials also reduce the costs, delays, and inconvenience associated with theft. Unlike copper, MLC pipes are not as desirable to thieves due to plastic’s low scrap value.
A professional installation
Installers need to be confident the plumbing system they are working on is installed correctly; without issues that could cause significant building damage.
A pipe detaching from its connection can lead to flooding and costly repairs. This failure, caused by incorrect depth insertion, is impossible to predict without expensive, time-consuming X-ray verification, which can apply to hundreds of connections on larger projects. These faulty pipes could detach at any time, so a reliable connection is critical.
With traditional fittings, the risk of full-bore blow off is high. For example, metal press or standard push-fit fittings rely on installers carefully following lengthy processes with measuring gauges and calibration equipment. For copper, this also involves priming, applying flux, and soldering.
On larger projects with countless connections and installation steps, the risk of human error increases if processes are not meticulously followed. With metal press fittings, full-bore detachment failures can easily occur as the pipe disconnects from the fittings, causing significant flooding and damage.
MLCP systems use reliable leak-free fittings with viewing windows that allow visual confirmation of proper insertion depth, eliminating the risk of human error. Systems such as Uponor’s Uni Pipe MLCP with press fit technology offer installers a reliable, efficient, and leak-proof installation in just three easy steps: cut the pipe, place the fitting on the pipe, and then press for a secure, watertight connection.
A hygienic solution
Beyond installation advantages, MLCP is a hygienic solution that avoids bacterial build-up, making it an ideal choice for drinking water delivery. The smooth inner plastic layer prevents the accumulation of contaminants and biofilms that can harbour harmful bacteria, ensuring the water it carries remains clean and safe for consumption.
MLCP also has a significantly lower environmental impact across the whole product life-cycle, reducing a building’s carbon footprint compared to copper pipes, which require energy-intensive mining and manufacturing processes.
Additionally, the long service life of MLCP, typically estimated at 50 years or more, further contributes to the sustainability of the system, minimising the need for frequent replacement and associated waste.
Making the change to MLCP
MLCP’s unique structure and properties make it an attractive choice for many applications, from residential homes to commercial facilities and high-rise buildings. By considering its combination of easy installation, reliable connections, stable costs, and long service life, plumbing and heating installers can take advantage of this pipe technology’s many benefits over traditional pipe systems.
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