PE extrusion pipe connection and common problems

The use of pipes must be connected, the pipe is cut by cut, need to be connected according to the length of use, then how to connect the PE water supply extrusion pipe?

The common connection methods of urban PE water supply extrusion pipes are: hot melt connection, electric fusion connection, socket type flexible connection, flange connection, steel-plastic transition joint connection, etc.

Hot melt connection

The hot melt connection is to use a special heating tool to heat the PE extrusion pipe or pipe fittings to be connected under pressure, so that it is melted, remove the heating tool, pressure the two melting surfaces together, and keep it under stable pressure for a period of time until the joint cools. Hot melt connection includes hot melt butt connection, hot melt socket connection and hot melt saddle connection.

Electric fusion connection

Electric fusion connection is one of the methods that a special electric fusion pipe with embedded resistance wire and PE extrusion pipe or pipe connection part close contact with electricity, PE extrusion pipe through the embedded resistance wire heating connection part, so that it is fused together until the joint is cooled.Electric fusion connection can be used to connect PE extrusion pipes or socket fittings of different types and melt flow rates. Electric fusion connection is divided into electric fusion socket connection and electric fusion saddle connection.

Socket type flexible connection

PE extrusion pipe socket type flexible connection is a new type of connection developed according to the socket type flexible connection principle of cast iron pipe and PVC extrusion pipe (PVC-U).The socket type flexible connection is to insert one end of the PE extrusion pipe directly into the special spigot of the pipe or pipe fitting, tighten the tensile pull through the locking ring in the spigot, and press the rubber seal tightly to connect the PE extrusion pipe and pipe fitting.

Flange connection

Flange connection is mainly used for PE extrusion pipe and metal pipe or valve, flow meter, pressure gauge and other auxiliary equipment connection. The flange connection is mainly composed of PE flange connectors, steel or aluminum back pressure lofting flanges, steel or aluminum flanges, gaskets or sealing rings, bolts, nuts, etc. Flange connection is to tighten the bolts and nuts, so that the flange connector is in close contact with the flange plate to achieve the connection purpose.

Steel-plastic transition joint connection

Steel-plastic transition joint connection is the use of cold-pressed or other prefabricated steel-plastic transition joint to connect PE extrusion pipe and metal pipe.The steel plastic transition joint has a tensile locking ring and a sealing ring, which usually requires it to have good sealing performance, drawing resistance and pressure resistance than the PE extrusion pipe in the system.

Can the pipe and the pipe (or pipe fittings) of different pipe walls be welded directly?

If the pipe and the pipe (or pipe fittings) with different wall thickness are directly hot fused, the heating temperature of the hot plate is the same, and the cross-sectional area of the hot melt zone of the pipe and the pipe (or pipe fittings) is not the same, and the welding pressure is the same, which will lead to inconsistent weld edges, and cannot guarantee the bonding effect between the two, affecting the quality of the butt.

What is the best length of the observation hole after welding?

When the wall thickness of the pipe fittings is certain, it can be adjusted by the laying depth of the resistance wire, and the emergence length of the observation hole can also reflect the quality of the wiring situation. If the output is too long, the wiring is too deep. If the output is too short, the wiring is too shallow. Generally, the emergence of the observation hole is only used as a sign of the completion of welding, there is no specific requirement, but the normal emergence of 5mm to 6mm is appropriate.