HDPE pipe welding

A polyethylene joint is not an assembly — it is a weld, and once it is made the pipe either is or is not continuous. There is no gasket to replace and no flange to re-torque. Everything therefore rests on machine condition, operator competence and recorded parameters.

We hold eleven butt fusion machines giving continuous coverage from 20 mm to 1200 mm, with third-party calibration on the units that carry critical work. Welding is supervised under SKZ DVGW GW 331, the German certified-supervisor standard for HDPE pipe welding.

Diameter coverage without a gap

The reason the fleet is structured this way is that diameter gaps force sub-hire, and sub-hired machines arrive with unknown calibration and unfamiliar operators. Every size from a 20 mm service connection to a 1200 mm trunk main is covered by a machine we own and a crew we trained.

Jointing methods

Butt fusion

The primary method for straight runs and the one that produces the strongest joint. Pipe ends are faced, aligned, heated against a controlled plate, and fused under recorded pressure. Heating time, soak, changeover and cooling are all parameter-controlled and logged.

Electrofusion

Used for repairs, tie-ins, branch connections and locations where a butt fusion machine cannot be positioned. Four electrofusion units — Fox Eurotech and Ritmo Elektra — with calibration certificates current through March 2027.

Where this gets used

• Seawater intake and outfall pipelines
• Cooling water and chiller circuits, including conversion from metallic systems
• Potable and treated water distribution mains
• Firewater ring mains
• Storm water and drainage networks
• Chemical dosing and effluent lines

Standards we work to

• DVS 2207-1
• DVS 2207-4
• ISO 21307
• ISO 12176-1
• ISO 12176-2
• SKZ DVGW GW 331
• ISO 4427