First, the pipes and fittings cannot be rotated during the heating and splicing process, they should be inserted in a straight line, and normal welding should form a uniform and firm welding surface on the joint surface. Second, the welding construction should be operated in strict accordance with the technical regulations. The hand-held welding tool is suitable for the final connection of small-diameter pipes and pipeline systems, and the trolley-type welding machine is suitable for the pre-assembled connection of large-diameter pipes. Third, the production of PE pipe adopts a general general injection machine, the material melting temperature is 200-220 ° C, and a high-speed low-pressure injection molding process is generally used. To deal with the antistatic situation of PE pipe fittings: First of all, all the components in the formula can be measured in a certain proportion, mixed in a high-speed mixer, and extruded and granulated by a twin-screw extruder. This process is simple. , the processing cost is low. Then, it is also possible to extract and measure all the auxiliary ingredients in the formula according to a certain proportion, add a certain amount of PE carrier, mix by melting and banburying, and extrude and granulate. In addition, the masterbatch can be directly extruded by adding PE resin according to the proportion. The problems that need to be paid attention to in the backfilling of PE pipes and fittings: First, use sandy soil or the original soil that meets the requirements to backfill the PE pipes. The height of one backfill is 100-150mm. After tamping, backfill the second layer until the backfill is above the top of the pipe. at least 100mm. Then, after the pipeline pressure test is qualified, a large area is backfilled, and the part above 300mm from the top of the pipe is backfilled with the original soil and filled. Again, when using mechanical backfilling, it is necessary to backfill from both sides of the pipe at the same time, and the machine must not travel on the pipe. In addition, in the process of backfilling, the gap between the lower part of the pipe and the bottom of the pipe is easily ignored, and attention should be paid to compaction.
