HDPE coupling fittings are pipe fittings made of high-density polyethylene (HDPE), including a variety of components used to connect, extend, or change the direction of pipes. HDPE is a highly crystalline, non-polar thermoplastic resin with excellent chemical resistance, water and vapor resistance, electrical properties, and good impact resistance. It performs well even at low temperatures. Therefore, HDPE pipe fittings are widely used in a variety of applications requiring chemical resistance and good mechanical properties. This article mainly introduces How to install HDPE pipe fittings.
Installation steps
The steps of installing hdpe coupling fittings include preparing tools and materials, measuring and marking, cutting the pipe, connecting the pipe, fixing the pipe, and checking the connection.
1. Prepare tools and materials: The tools and materials needed to install hdpe coupling fittings include pipe cutters, welding machines, pipe clamps, rubber gaskets, and HDPE pipes. The selection of these tools and materials is critical to ensure the quality and safety of the pipe fittings.
2. Measurement and marking: Before installation, the location of the HDPE pipe fittings needs to be measured and marked to determine the length and location of the pipe according to the actual need, and mark it on the wall or floor.
3. Cutting pipe: Use a pipe cutter to cut the pipe into appropriate length segments according to the marked length, and keep the cutting surface flat and smooth.
4. Connecting pipes: Use a heat fusion machine to connect two pipes together, clean the inside of the pipes and the surface of the connectors before connecting to ensure that the connectors are tight and seamless.
5. Fixing pipes: Use pipe clips to fix the pipes on the wall or the ground, choose appropriate pipe clips and fixing positions to ensure the stability of the pipes and prevent pressure fluctuations.
6. Connection check: After the installation is completed, check the piping connections to ensure that the connections are well-sealed and free of leaks.
Install HDPE coupling fittings precautions
1. For buried HDPE coupling fittings, DN ≤ 110 pipeline installation in summer can be slightly serpentine laying, DN ≥ 110 pipeline due to sufficient soil resistance, can resist thermal stress, without the need to reserve the length of the pipe; in winter, are not required to reserve the length of the pipe.
2. In places where the installation space is small (such as a pipe well, ceiling construction, etc.), an electrofusion connection should be used for installation.
In the heat fusion socket connection, the heating temperature can not be too high, or too long, the temperature is best controlled at 210 ± 10 ℃, otherwise, it will cause the fittings extruded within the melted slurry to be too much to reduce the water through the inner diameter; socket fittings or pipe interfaces should be clean, otherwise, it will cause the socket to disconnect the leakage; at the same time, pay attention to the control of the fittings of the angle and direction, to avoid causing rework.
3. In the trenching machine work process, each turn a week to rotate the knife handle an appropriate amount (about 0.5MM) to cut pipe and scrape the groove, into the knife handle to the limit screws, and close the machine power switch. Then loosen the chuck, and remove the pipe that has been grooved for burr check, the requirements for the end face to be flat and burr-free. If there is a small amount of burrs that need to be trimmed and scraped, be careful not to scratch the sealing part.
4. When the pipe is connected to the inspection well, a flexible connection should be used to adapt to the settlement changes of the inspection well and the plastic pipe and to ensure that even under the premise of error can still maintain the sealing state, to avoid deformation due to water seepage.
5. In the pipeline pressure test process, the following points should be noted: the length of the pipeline pressure test section should depend on the site-specific conditions; for the pipeline without node connection, the length of the pressure test section should not be greater than 1500m, there are nodes of the pipeline section pressure test length should not be greater than 1,000m; before the test, it should be isolated from participating in the test of the system equipment, instrumentation, and piping accessories, such as removing the safety valve, etc.; in addition, the addition of the part of the blind There should be obvious marking and record; test, the ambient temperature shall not be lower than 5 ℃, the pipeline test pressure should be set to 1.5 times the design pressure; water injection should be drained of air.
6. During the pressure-maintaining period, it is forbidden to move the connection or apply any external force on the connection. When the pipe fittings and pipes are at the gap in the formation of the uniform flange, it proves that electrofusion is qualified.
7. After installation, a water test and air pressure test should be carried out to confirm that there is no leakage, and then fix the pipeline firmly.
In addition, the following points should be noted.
Ensure the quality of pipes and connectors is qualified and the surface is clean before installation.
Pay attention to safety when using the heat fusion machine to avoid scalding and fire accidents.
Check the whole piping system after installation is completed and take care of any leakage.
By following these steps and precautions, you can ensure the installation quality of HDPE pipe fittings and improve the safety and stability of the piping system
