What type of fittings should be used with pe pipes?

Optimal Design of Injection Molding Process for PE Pipe Fittings

With the maturity of polyethylene (PE) preparation process and its safe and environmentally friendly performance, PE pipe fittings are used more and more in municipal engineering, chemical industry, telecommunications and electrical industries, and their market share has greatly surpassed that of traditional polyethylene pe pipe fittings. Vinyl chloride (Pvc), PP. The trend of R pe pipe fittings..., but affected by the rheological properties and molding properties of the material itself, the injection molded PE pipe fittings shrink greatly, and the orifice is easy to lose its round shape. When it is welded with other pe pipe fittings or pipes, the overlapping area is small or it is difficult to socket. Even in the fixture's

It can be welded under the action, but it is prone to creep failure in the long-term use process, resulting in serious quality accidents. The shrinkage rate of PE with different densities varies greatly (the shrinkage rate of low-density PE is between 1.5% and 5.0%, and that of high-density PE is between 2.5% and 6.0%), making the pipe fittings Regional uneven shrinkage is more prominent. Anisotropic shrinkage caused by polyolefin molecular orientation is

The reason for the uneven shrinkage of PE pipe fittings, and the uneven shrinkage, molecular orientation and different cooling rates of the product lead to residual stress, which is the direct cause of the deformation of the pe pipe fitting orifice. Generally speaking, the product structure determines 40% of the deformation, the mold structure and material determine 30% of the deformation, and the process determines 10% of the deformation. When the product structure, mold structure, and material are determined, only scientific and reasonable Only by designing the product molding process can the deformation of the orifice of PE pipe fittings be reduced.

PE Water Pipe Fittings

For cylindrical injection molded pe pipe fittings, due to the flexibility of the macromolecular chain, when the product is completely cooled, the volume shrinkage and linear shrinkage change is small, and the size of the product is relatively stable. However, with the release of internal residual stress, when the pipe fitting is not strong enough to resist When deformed, the entire orifice is deformed in the radial direction due to uneven tensile force. When the tensile stress in a certain direction is large, the entire circle will be elliptical deformed in a direction perpendicular to it. The measure of out-of-roundness can be calculated by the following formula: out-of-roundness = maximum diameter - minimum diameter

Orthogonal experiment is one of the most commonly used experimental methods in Design of Experiments (DOE). It is based on probability theory and mathematical statistics, and designs experiments based on the orthogonality of data in multi-factor and multi-level experiments. Submit the form to arrange the experimental plan, and calculate and analyze the experimental results. It can be used to determine the degree of influence of each parameter on the product among the many injection molding process parameters that affect product quality, and whether there is interaction between each parameter. The degree of interaction How big it is, how much it contributes to product quality, and select a better solution to achieve the purpose of reducing the number of experiments and shortening the experiment cycle.

During the injection molding of PE pipe fittings, there are many factors that affect the deformation of the orifice. In the general setting process, the main process parameters that can be controlled are injection time, mold temperature, melt temperature, and pressure-holding PE pipe fittings. During the injection molding production of PE pipe fittings, there are many factors that affect the deformation of the orifice. The main process parameters that can be controlled in the general setting process are injection time, mold temperature, melt temperature, and holding pressure.

HDPE Pipe Fittings

1. What Methods can be used to assemble a PE Pipe Network?

Electrofusion

Electrofusion fitting, also known as EF, is one of the simplest methods used in joining the PE pipe. The use of EF uses copper coils and winds it through the inner part of the fitting. Then the pipes get pushed into either side of the fitting, and then an electric current is passed through the coil. The heat from the current melts heat the copper coil, resulting in both the fitting and the pipe fusing pipes.

After the heat cycle is terminated, the pipes are left to cool and the two pipes from a sound joint.  However, the electrofusion needs to be done right to be effective.  There should also be satisfactory contact during the joining and cooling process.

Butt welding

The use of butt welding is another way you can use it to join the water pipe fitting PE fittings. The process uses a specialized hydraulic clamping machine to cut the ends of the two pipes. When the pipes are trimmed are properly trimmed, the hot plate is placed onto both ends, and after heating, the plates are removed, and two ends are pushed together, causing them to melt. As a result of this joining method, a raised beam is formed. This can be an issue in the case where a smooth internal bore is needed. Though it is possible to remove the bead, it could result in other complications with the connection.

If you want to get the best joint, you need to make sure that the part being joined together is clean. If the surfaces are dirty, this could increase the possibility of contamination. Ensure that you use correct welding temperatures, pressure when joining and give the pipe ample time to fuse. If you do not want to deal with the bead, you can search for experts to properly remove it.

Compression Jointing

Another method that can be used to hold the PE pipe together is the compression couplings. This is a method that incorporates the pope firm and then pushes it through the O-Ring. After the procedure compression ring is then turned, and it is used to tighten the grip. The best material for making the fitting is the EPMD O-Ring.

The compression method is simple and does not need a professional to do it.

Hot melting

The connection of pe pipes and poly pipe fittings could adopt hot-melt connection (hot-melt butt, hot-melt socket connection, hot-me lt saddle connection). Pipes with a nominal outer diameter greater than or equal to 63mm should not be connected by manual hot-melt sockets, pipes with a wall thickness of less than 6mm should not be connected by hot-melt butt joints, and polyethylene pipes and water pipe fitting , poly pipe fittings should not be connected and bonded by thread.

2. Can different grades of PE be connected to each other?

It is possible to fuse different grades of PE pipes using any of the methods discussed above. However, to achieve the best outcome, the procedure needs to be carried out under controlled conditions. You also need to be careful not to collapse the thinner pipes during the fusion period. In case you are in doubt, it is best to consult the pipe and water pipe fitting , poly pipe fittings supplier. Note that fusing different grades of PE could lead to the reduction of the maximum operating pressure.

3. How can PE pipe be connected to other pipe materials?

The PE pipes can be connected to other materials using various mechanical water pipe fitting , poly pipe fittings that can be found from relevant manufacturers. Depending on the types of pipes you will be using, you might have to connect the pipes directly through the flange option. For the pipe to be connected, the outer body needs to be compatible with the pipe being joined.

You might also need to have an elastomeric sealing ring. The ring is essential as it helps keep the pipe tight, and an internal pipe stiffener can be used to offer long-term integrity. You need to ensure you have specified the size of the pope when ordering the water pipe fitting , poly pipe fittings.