Illustrations: PPR plumbing installation

PPR pipe, commonly known as three polypropylene. It is a renewal product of galvanized pipe, UPVC water supply pipe, aluminum plastic pipe, PE pipe, PE-X pipe, and PE-RT pipe. Because of its use of random copolymerization technology, the strength and high temperature resistance of polypropylene are well ensured, thus becoming the main force of water pipe materials. PPR pipes are widely used in construction and drainage, urban and rural water supply and drainage, city gas, electricity and optical cables. Sheathing, industrial fluid transport, agricultural irrigation and other construction, municipal, industrial and agricultural fields. Today, Xiao Bian came to take you to find out how PPR pipes are installed.

First, welding tools:

In the PP-R pipe system, the connection between pipes and fittings is connected by hot melt sockets. It is achieved by means of a special hot-melt tool that melts and sockets the inner and outer surfaces of the pipe fittings and the tubing at the same time under specified conditions of temperature and time. The two parts form a uniformly sealed whole with cooling. This type of connection has good sealing performance, high reliability, and eliminates leakage. The welding technology requirements are shown in the table.

Second, the operating points:

1. Before construction, it is necessary to check whether the specifications of the fittings or fittings to be installed conform to the construction requirements. Special attention should be paid to the fact that cold and hot water pipes cannot be mistaken or mixed.

2. Inspect the appearance quality of pipes and fittings. Cracks must be removed to remove oil stains and burrs on the surface of the product. Operate strictly according to the specified technical parameters. Pipes and fittings cannot be turned during the heating process and should be inserted straight.

3, normal welding, pipe and pipe joints should have a uniform weld ring.

4. In the unskilled case, the insertion depth is determined at the insertion end of the pipe, and the hand insertion depth is strictly controlled so as to prevent the insertion of a deep seal pipe diameter from affecting the flow.

5, after the construction must be pressure test acceptance before sealing and use.

Third, welding operation technical parameters table:

Fourth, welding steps:

1. Cut off the pipe and cut the pipe using a special pipe. The bayonet clip should be adjusted to match the diameter of the pipe to be cut, and the rotary cutting should be evenly applied. When cutting off, it must be cut vertically with a pipe cutter. After cutting, trim the trimming of the cutting head.

2. When hot-melting, the end of the water pipe should be introduced into the heated mold sleeve and put into the appropriate depth. At the same time, push the pipe to the heating die to reach the same depth. Note that marks are made at the pipe insertion depth (equal to the nesting depth of the joint).

3. Heat the entire depth of embedment, including tubing and fittings, on the welding tool.

4. When the heating time is complete, push the tube into the joint smoothly and evenly to form a firm and perfect bond.

Installation Technology Considerations

◆ In winter, if the temperature is below 0°C, the pipe may be damaged if it is hit by an external force.

â—† When transporting or storing the product, avoid direct sunlight, place it for a long time, and keep away from heat sources.

â—† The coefficient of expansion of PP-R pipe is relatively large. Technical measures must be taken to prevent the thermal deformation of the pipe when it is applied in an open or buried pipe.

â—† When applying an open or non-buried tube, one branch or hanger (tube hanger) must be installed every 400mm.

â—† In the construction of the project, the relevant design and construction specifications shall be followed. The construction personnel shall go through technical training and hold certificates.

The pipes and fittings are completely fused, and they are perfectly matched and never leak.

When the temperature difference is large, measures must be taken to prevent expansion

A: Install the pipe in the shaft

When piping is installed in the shaft, the supervisor will cause thermal expansion and contraction vertically between the two floors. A fixing bracket (tube buckle seat) shall be installed near the two branch pipes of the main pipe. The distance between the brackets shall not exceed 400 mm. Use other methods to compensate. Such as: use the branch pipe for natural compensation.

B: Outer pipe network

1. The direction of pipe network change can be used to compensate for the amount of line expansion. Under special circumstances, the "U" type circuit pipe can be used to compensate for expansion. It is mainly used for piping of 50-110MM. When installing the anchorage position, pay attention to separate the pipe. As each part, the expansion force can be directed to the desired direction.

2, Ф 20-50MM pipeline, can use mechanical restraint to prevent expansion.

C: dark pipe

Pipes embedded in walls, floors, etc. are capable of preventing expansion and ensuring that pressure and tensile forces are absorbed without damaging the various decoration materials. If the pipeline has insulation material (to meet the standards), these insulation materials can allow more expansion, and the outside diameter of the pipeline should not exceed Ф25mm.

Note: When the operating temperature is lower than 5°C, the heating time should be extended by 50%.

With regard to the installation of PPR water pipes, Xiao Bian introduced it to you today. We can understand that although there is a small possibility of doing it yourself, even if you ask the master to decorate, you cannot know nothing about it. ! For more information, please pay attention to this site!

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