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Fiber reinforced polyethylene pipeline

Published on:

2023-12-29

All pipeline joints should be connected by electric fusion or hot fusion, and mechanical connections are not allowed. The strength of the hot melt joint is greater than the strength of the pipeline itself.

1、 Fiber reinforced polyethylene pipeline hot melt welding technology

Hot docking is a method of heating and melting the ends of pipes using a heating plate, and then cooling and connecting them together. Usually, a hot melt welding machine is used to heat the end tube, melt it, quickly fit it, maintain a certain pressure, and cool it to achieve the purpose of welding. Fiber reinforced polyethylene pipes of various sizes can be connected through hot melt docking. But for pipes with a nominal diameter less than 63mm, it is recommended to use socket hot melt connections. This method is economically reliable, and its interface has higher strength than the pipeline itself when subjected to tension and pressure.

2、 Hot melt welding process

(1) Selection of welding methods
All pipeline joints should be connected by electric fusion or hot fusion, and mechanical connections are not allowed. The strength of the hot melt joint is greater than the strength of the pipeline itself. Or the connector is made of plastic and does not have any corrosion issues. The choice of fiber reinforced polyethylene pipeline connection method depends on the requirements and recommendations of the pipeline manufacturer, as well as the technology mastered by on-site construction personnel. Hot welding first involves polishing, cleaning, and aligning the pipe ends, then heating them to the melting point to connect the pipe ends together. In industry, there are two types of hot melt technology: butt joints and socket joints.

(2) Selection of welding equipment and tools
The equipment adopts 450 and 315 hot melt welding machines, and hydraulic welding machines are used for assembly.

(3) Operation and requirements for fiber reinforced polyethylene pipes before welding
Use a pry bar or bracket to flatten the fiber-reinforced polyethylene pipe, adjust the concentricity, correct the out of roundness of the pipe with a fixture, and leave sufficient welding distance. Mill out sufficient thickness to make the welding end face smooth and parallel, ensuring that the gap between the mating surfaces is less than 0.3mm and the offset is less than 10% of the wall thickness at the welding site. When reinstalling the card, the card needs to be milled again.

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