Construction technology of PE steel plastic composite pipe
PE the water supply pipe is connected by hot melt welding and electrofusion welding. The hot melt connection is divided into hot melt socket connection and hot melt butt joint, and the electric melting connection is divided into an electric melting plug connection and an electric melting saddle type connection.
1. before installation, check the groove to meet the installation requirements, and then check the appearance of the pipe there is no obvious sag, cracks, scratches, scratches, found quality problems, timely replacement.In 2., three links, elbow, reducer etc. fire hydrant with C20 concrete concrete pier, brick pier reinforcement flange valve.3. PE water supply pipe and metal pipe, valve, fire hydrant connection, must use plastic steel transition joint or special flange connection.4. the exhaust valve shall be installed at the uplift part of the pipeline or on the uphill side to reduce the impact of the water pressure on the pipe. The ratio of the pipe and exhaust valve is designed to be 1:8.5. because the PE pipe itself has good flexibility and flexibility, all pipe installation has not considered the installation of expansion joint.
We use hot melt butt joint construction, and its main steps are:1. material: pipe or fittings in the flat position, put in the docking machine, the cutting allowance for 10-20mm.2., clamping: according to the welded pipe, pipe fittings, select the appropriate slips clamp, clamping pipe, ready for cutting.3., cutting: cutting pipe, welded pipe, pipe end impurities and oxidation layer, to ensure that two butt end surface smooth, smooth, no impurities.4. pairs: two welded pipe end face should be completely right, the smaller the wrong edge, the better the wrong edge can not exceed 10% of the wall thickness. Otherwise, the quality of docking will be affected.5. heating: docking in general the temperature between 210-230 DEG C is appropriate, and don't have time heating board, the two end melting length of 1-2mm is preferred.6. switch: take the heating plate off, quickly let two hot melt end face stick and pressure, in order to ensure the quality of molten butt, the shorter switching cycle is better.7. melt butt welding: welding is the key, the docking process should always be under the melting pressure, the roll width of 2-4mm is appropriate.8., cooling: to maintain the docking pressure unchanged, so that the interface slowly cooling, cooling time to touch the edge of the blunt, can not feel the heat prevail.9. dock complete: cool down, Sunca Kauwa, remove the docking machine, re prepare the next interface connection.
