HDPE butt welding put simply is the process of joining two pieces of HDPE pipe together to create a fusion weld.
HDPE Pipelines and their design & construction
It works by first by inserting the two ends of the HDPE pipe into the butt fusion welding machine. A facer or facing machine is used to trim and cut the end of the pipe to create both a flat surface and to remove oxidized polyurethane. Once completed the facer is removed and an electric heating plate is lowered between the two ends of the HDPE in the buttwelding machine. The anti-stick PTFE coated heating plate is used to simultaneously heat up and melt the two pipes forming a small bead at each end. Once the two pipes are suitably hot and melted, the hot plate is removed and the two ends are thrust together using the hydraulic rams and clamps on the buttwelding machine forming a bond. As the pipe cools the two pieces join together in permanent bond.
The time it takes to suitably melt and cool down to create a strong fusion bond will depend on the thickness, diameter and material of pipe. The larger the diameter and thickness of the pipe, the longer it will take to form each joint. Some butt welding machines include automated times that take the properties of the pipe and calculate the time for fusion and cooling. Pipe rollers are used to support the HDPE pipe during butt welding to reduce strain on the hydraulic rams, reduce manual handling and increase speed of works.
When selecting the specification of the HDPE pipe there are a few key points to consider:
- Diameter of pipe
- Standard Dimension Ratio (SDR) is the pressure rating for piping. SDR is the ratio of the outer pipe diameter (D) to wall thickness (s). The lower the SDR value the thicker the pipe. The average internal diameter will stay roughly the same for all SDR ratios, and the outer diameter will increase/decrease accordingly.
- PE80 or PE100 relates to the strength of the pipe in accordance with ISO 12162.
- Length of pipe
Why use WJ?
WJ have expanded our expertise through in-house experience of HDPE installation services since its inception. We have worked with many main contractors and are a highly regarded sub-contractor for major construction projects in Middle East.
We offer our HDPE installation services to the regional construction, industrial, water and waste water industries. We carry out HDPE pipeline installation & welding services with Butt Fusion & Electro Fusion techniques. Our operations team consists of skilled, qualified and certified technicians with the know-how of up to date technology and are experienced with precise accuracy and perfection for the works. WJ can supply a wide range of pipes in different class, accessories and fittings.
WJ use Wassertek high performance butt fusion welding machines and we keep a range of sizes readily available in stock.
Equipment rental for HDPE Pipeline Services
Part of the WJ Group, WJ Middle East provides equipment rental services for a wide range of HDPE pipeline service applications throughout the Middle East and Overseas. WJ specialise in turnkey rental solutions with a complete design, installation, operation and maintenance service.
Call WJ Middle East on
+971 4 885 5254