Problems with PE pipe joints
PE pipes can meet certain application requirements in the application process, but in the process of processing, the actual operation must be carried out strictly in accordance with the actual operation requirements, so as to achieve good actual results. Let's understand the key of PE pipe joints together. What is the problem.
The shortcomings of PE pipe hot-melt butt joints include the shortcomings of the shape of the weld. The key is the error in the specification and structure of the joint roll; , the connection surface is not clean, the axial error is too large, etc.; the main disadvantage of the microstructure is that the plastic is damaged by obvious thermal oxidation, resulting in the deterioration of the pipe material. The microscopic disadvantages are thermal oxidation damage of stomatal plastic, insufficient welding temperature and pressure, insufficient welding, forced refrigeration of the interface and welding in severe cold natural environment, cracks, foreign impurities, etc. The key factors that cause problems in PE pipe joints are welding operations. Professional skills, sense of responsibility, quality and working conditions of welding equipment, mutual fusion between welded pipes, material storage, raw material quality, welding process, welding natural environment and climate, etc.
What are the safety problems of PE water supply pipes?
When the PE water supply pipe is installed, it is necessary to accurately measure the working voltage after loading and ground the equipment shell to ensure life safety. Be sure to accurately measure the working voltage of the power grid and generator to ensure that the working voltage is 220V to prevent machine damage. The heating plate temperature display light must be red to ensure the welding temperature. All items touched by the welding inner hole must be clean to ensure the welding quality. When milling, the safety buckle of the milling cutter must be locked to prevent the milling cutter from flying out and causing injury. There must be sufficient spacing for the clamped tube to ensure that the welding inner hole is in reasonable contact, and the milling chips must be continuous long chips to ensure that the welding inner hole is in reasonable contact. When removing the milling cutter and hot plate, do not bruise the inner hole to avoid unevenness and scratches on the reverse side. When removing the milling cutter and hot plate, do not bruise the inner hole to avoid unevenness and scratches on the reverse side. When starting the pump station, the direction lever should be in the neutral position to ensure that the motor starts without load.
Installation and protection reminder of PE water supply pipe
In order to better ensure the quality of PE water supply pipes, the construction team should understand the characteristics of the pipes and carry out construction according to the requirements of relevant technical specifications or technical manuals. PE water supply pipes belong to plastic pipes and have poorer rigidity and impact resistance than metal pipes. Therefore, in winter storage and transportation, and in the installation process after engineering construction, attention should be paid to safe and civilized construction, production safety, and moderate maintenance of finished products in many aspects. . During the construction of the project, it should be prevented from applying inappropriate external force to the pipeline to cause damage to the machinery and equipment, leaving invisible cracks in the pipeline and planting hidden safety hazards.
Do not press, beat, pedal or hang heavy objects on the installed pipes, and cover the parts that are easily affected by external forces when necessary. PE water supply pipes have a certain degree of ultra-low temperature brittleness at ultra-low temperatures. Attention should be paid to construction measures in winter. Do not use chainsaws, hand saws, or rapid cutting to prevent impact damage to the top of the pipe, and even produce invisible cracks, resulting in hidden water seepage safety hazards.
When cutting the pipe with scissors, the scissors should be perpendicular to the axis of the pipe, and the pipe and the scissors should be rotated and pressed down hard. Do not cut the pipe with force in one direction, because that will cause the top of the pipe to be squeezed and deformed, and micro-cracks will easily occur at the deformation, resulting in safety hazards. In winter construction measures, be especially careful, you can cut off 4~125px from the top of the pipe.
The connecting end face of the pipe and the pipe fitting must be clean, dry and oil-free. Use a ruler and a suitable pen to accurately measure and plot the hot melt depth at the end of the tube, and the hot melt depth should meet the regulations. When hot-melting connection, guide the pipe into the heating jacket without rotation and insert it to the marked depth, and push the pipe onto the heating head without rotation to achieve the required marking. The heating time should consider the technical requirements of the PE water supply pipe hot melt socket welding machine. If the ambient temperature is low, the heating time can be appropriately increased.
According to the standard requirements, the PE water supply pipe must be pressure tested after installation. Pipeline pressure test should be carried out after 24 hours of hot-melt socket connection; during pressure test, manual pump should be used for pressure, the pressure increase time is not less than 10min, the pressure accuracy of accurate measurement equipment is 0.01Mpa, and the test pressure is 1.5 times the working pressure And not less than 0.6MPa, the pressure drop of the voltage stabilizer tube should not exceed 0.02MPa for 1 hour, and there is no leakage or leakage.