Marley Pipesystems

•    Flexibility translates to ease of installation and fewer joints
•    Long lengths (up to 100 meters)
•    UV resistant
•    Several jointing methods
•    High abrasive resistance
•    Low mass
•    Smooth bore
•    Corrosion resistance
•    Compatibility with other materials
•    Low temperature toughness

The HDPE pipes manufactured by Marley Pipe Systems are manufactured to, and carry the SABS mark for, SANS ISO 4427. These pipes are manufactured from two different designated materials, viz: PE80 and PE100. SANS ISO 4427 have grouped together the different pressure classes, produced from different material designations, under a common heading known as the Standard Diameter (Dimension) Ratio or SDR. The minimum wall thicknesses specified are not exactly that which would be derived from a calculation using Barlow’s formula (OD÷T) or the SDR but are the rounded up values of the highest minimum wall thickness calculated for any size and class in the SDR group.

HDPE Pressure Pipes take into account the following design considerations:
•    Flow
•    Pressure
•    Temperature
•    Trench Load
•    Above Ground Installation
•    Bending

For more information, please see PDF downloads for HDPE.

One of the greatest features of HDPE pipes is the fact that a wide variety of jointing systems is available to suit a wide range of applications.

Permanent Jointing

Both permanent jointing methods allow transition to detachable joints

Buttwelding: This jointing technique is a very economical and reliable way for establishing permanent homogenous joints, requiring only buttwelding equipment. Buttwelding is particularly suitable for prefabricating pipe sections and special fittings. Only pipes and fittings from the same wall thickness series can be buttwelded together.

Electrofusion: Jointing using electrofusion is simple, quick and efficient and offers maximum joint integrity. The efficient assembly on-site of pipes, fittings or prefabricated pipework can be achieved using electrofusion couplers and electrofusion equipment. Only fittings with long spigot ends are suitable for electrofusion.

Non-permanent Jointing

Flanges: These fittings are used with stubs to establish detachable joints in HDPE pressure pipe systems. Stubs may be buttwelded to pipe or spigot ends on buttweld fittings.

Compression Fittings: Marley supplies a comprehensive range of compression fittings dedicated to fluid reticulation for smaller diameters less than 160mm as well as an affordable solution for the smallest diameters less than 75mm.