Jointing Systems

It is important that the most efficient method of joint is used to ensure the pipeline remains watertight, durable and effective for potentially excessive movement in poor ground conditions; and depending on application, there are different methods of jointing Weholite including heat extrusion, band seal, bolted flange and non-watertight band.* *Please contact Asset International Limited for advice on the most suitable system to fulfil your requirements.

1. Heat Extrusion Jointing

This process, carried out by direct Weholite personnel, provides an economical and fast method of delivering a complete, long, continuous length of pipeline, which allows the joint to be as strong as the pipe itself. Extrusion welding is a semi-mechanical process initially developed for joining thermoplastic sheeting and then adapted to thick-walled pipes where a higher level of joint integrity is required. Extrusion welded joints are proven in tests to be the industry’s strongest and most reliable method for joining structured wall pipes. The German DVS standard tests them to a 50% greater force than other welding processes such as electrofusion.

Extrusion welding has a proven track record globally for large diameter pipes up to 3500mm diameter, providing the safest and most versatile solution on the market whilst still improving the efficiency and adding value to the overall project.

2. Flexseal Couplings

Flexseal Extra Wide Couplings are used principally for connecting Weholite internal diameters of 400mm to 1800mm. Weholite Flexseal Couplings are 300mm wide, which allows for greater tolerance in the cutting of the ends of the pipe as well as providing for the movement of pipes due to settlement or thermal effects.

3. Lateral Connections

The WRc Approved, Universal Adaptor (UA) Saddle; manufactured by Flexseal, can be used with Weholite. When used in conjunction with a Flexseal coupling it is an easy to fit product for connecting 160mm laterals into Weholite post installation.

4. TeeKay Axiflex Couplings

The Teekay Axiflex is a high performance coupling that allows generous pipe angulation and expansion/contraction. The Axiflex is a popular choice of coupling with water authorities, civil engineers and building contractors and has been used on Weholite in sizes up to 3.3m external diameter.

5. Weholite Flat Bands and Other Joints

These flexible bands are used for sand tight joints or for location purposes. They are manufactured from HDPE and whilst offering no structural value, have a design life as long as Weholite.

We are able to manufacture and supply PN, bespoke and puddle flanges by design. HDPE Wall couplers for casting into concrete structures can also be produced.

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