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PPR pipe installation process and construction requirements:
1) Process flow
2) In order to ensure the installation quality, the material should be strictly inspected when purchased. The ellipticity of the pipe diameter should be less than 10%, the wall thickness deviation of the same section of the pipe should be less than 14%, and the inner and outer walls should be smooth and flat with no bubbles, cracks, cracks, etc. Depression, peeling and severe cold spots and visible marks.
3) Pipe cutting
Pipe cutting can also be used to cut the special pipe: pipe clip clip bayonet should be adjusted to match the diameter of the cut, the rotation should be cut off evenly after the cut, cut off the application of a full circle rounder.
When breaking the pipe, the section should be perpendicular to the pipe axis without burrs.
4) Connection of PP-R pipe
Can be welded, hot melt and threaded connections. Among them, the hot melt connection is the most reliable, the operation is convenient, the airtightness is good, and the interface strength is high. The pipeline connection of this project uses a handheld fusion splicer for hot melt connection.
Before connecting, remove dust and foreign matter from pipes and accessories.
The pipeline connection uses a fusion splicer to heat the pipe and fittings. The depth of heat fusion of the pipe and fittings should meet the requirements.
When connected, the end of the tube is inserted into the heating jacket without rotation to a predetermined depth. At the same time, the tube is pushed onto the heating head without heating, and immediately after the heating time is reached, the tube and the tube are removed from the heating sleeve and the heating head simultaneously, and the tube is quickly and uniformly inserted into the required depth without rotation. A uniform flange is formed at the joint. In the specified heating time, the just-welded joint can also be corrected, but it must not be rotated. Properly push the heated pipe and fittings into vertical alignment and do not apply excessive force to prevent bending of the elbow.
After the connection is completed, the pipe and fittings must be held tight for a sufficient cooling time. After cooling to a certain degree, they can be released.
When the PP-R pipe is connected with the metal pipe fittings, a PP-R pipe with a metal insert shall be used as a transition. The pipe fitting and the PP-R pipe shall be connected by hot melt socket and be connected with metal pipe fittings or hardware accessories of sanitary ware. When using screw connections, polypropylene tape should be used as a seal filler. When installing, do not use excessive force so as not to damage the screw fittings and cause leakage at the joints.
5) When installing pipes, especially when installing hot water pipes, consider the thermal expansion factor of the pipes. When the pipes are connected, use the pipe turning and bending angles to compensate the expansion and contraction of the pipes when the pipes are connected. When natural compensation is used, the pipe supports are used for sliding brackets, but they are not provided. The maximum length of the straight pipe fixing the bracket shall not exceed 3m. The natural compensation for the three-way connection of pipelines and straight pipelines can be done in the following ways:
X: Fixed bracket: | Sliding bracket
6) When the pipeline cannot use natural compensation, the pipeline uses a fixed bracket to limit thermal expansion.
7) The pipe supports shall be laid before the pipes are installed. The pipe clamps and hangers shall be installed according to different pipe diameters and requirements. The location shall be accurate and shall be laid flat. The pipe cards shall be in close contact with the pipes and shall not damage the pipe surface. When using a metal tube card, the metal tube card should be isolated from the pipe with a soft material such as plastic. In the connection of the metal pipe fittings and the water supply PP-R pipe, the pipe clamp should be located on the side of the metal pipe. In the water supply equipment such as valves, water meters, etc., there should be a fixed bracket, and its weight should not act on the pipeline. The maximum installation distance for cold and hot water pipe supports is shown in the table below. Hot and cold water pipes share brackets, should be determined according to the hot water pipe bracket spacing.
Polypropylene pipe hot and cold water pipe bracket maximum installation distance (mm)
8) In the indoor part of the water supply pipe and the air conditioning water pipe in the same location, taking into account the layout of all the indoor pipe, this part of the pipe can be arranged vertically on the side of the air conditioning tube, stent form the following: For the same type of fixed bracket, you can use two Pipe clamps for installation.
9) The vertical and horizontal bending of the horizontal pipe, the verticality of the riser, and the installation deviation of the pipes must meet the following table.
Polypropylene tube installation tolerance (mm)
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