What material is PVC-U pipe made of?

1. Basic knowledge of PVC-U water supply pipes PVC-U pipes are made of sanitary-grade polyvinyl chloride (PVC) resin as the main raw material, adding an appropriate amount of stabilizers, lubricants, fillers, colorants, etc. through a plastic extruder.

Extrusion molding and injection molding by injection molding machine complete the production of pipes and pipe fittings through cooling, solidification, shaping, inspection, packaging and other processes.

Compared with traditional pipes, PVC-U pipes have the advantages of light weight, corrosion resistance, small water flow resistance, energy saving, quick installation, and low cost. They have been vigorously promoted and applied, and the benefits are significant.

Our country has been piloting the application of PVC-U pipes in municipal engineering and construction projects since the 1980s. After more than 10 years of promotion, PVC-U pipes have developed rapidly, but per capita consumption is still lower than that of developed countries such as the United States, Japan, and Western Europe.

1/15 of countries and regions.

As the Ministry of Construction and other five departments jointly issued a notice to "vigorously develop chemical building materials" and stepped up the promotion and application of PVC-U plastic pipes, hygienic and environmentally friendly PVC-U water supply pipes have continuously replaced high energy consumption and high pollution

, traditional pipelines with high cost and low health indicators.

Widely used in: urban tap water supply projects, building internal and external water supply projects, industrial and mining enterprise water supply projects, underground fire water supply projects, farmland water conservancy and irrigation projects, gardening and greening water supply projects, aquaculture industry water supply and drainage projects, etc., and

Achieve good economic and social benefits.

2. Standards of PVC-U water supply pipes. The production standards of PVC-U water supply pipes include British standards, American standards, Japanese standards, IS0 international standards, national standards (GB), etc. Domestic manufacturers basically use national standards to organize production.

That is, the pipe standard number: GB/T10002.1-1996, and the pipe fitting standard number: GB10002.2-1998.

We recommend that users adopt national standard products, which are in line with national conditions, have more guaranteed quality, and are easy to use with other pipes (traditional pipes and other brands of PVC-U pipes).

1. Pipeline pressure requirements.

(1) The pressures shown in PVC-U water supply pipes are all expressed as nominal pressure, expressed in MPa, 1Mpa≈10kgf/cm2, which is the working pressure of the pipe for transporting media at 20°C.

However, as the temperature of the medium increases (mediums >50°C are not allowed to be transported), the working pressure decreases. This objectively requires a sufficient safety factor of pressure to be considered when selecting water supply pipelines.

(2) The nominal pressure of water supply pipes is specified as: 0.6Mpa, 0.8Mpa, 1.0Mpa, 1.25Mpa, 1.6Mpa, etc. 5 types.

(3) The nominal pressure of pipes of the same specifications is generally divided by the wall thickness of the pipe.

(4) The minimum diameter pipes in each pressure zone are stipulated as follows: the minimum diameter of 0.6Mpa pipes is 63mm, the minimum diameter of 0.8Mpa pipes is 50mm, the minimum diameter of 1.0Mpa pipes is 40mm, and the minimum diameter of 1.25Mpa pipes is 32mm.

, the minimum diameter of 1.6Mpa pipe is 20mm and 25mm.

(5) The nominal pressure of water supply pipes is generally 1.6Mpa and is matched with pipes of various pressures.

2. Pipe specifications.

(1) The specifications and dimensions of PVC-U water supply pipes stipulated in national standards are all nominal outer diameters, and pipe fittings are nominal inner diameters, represented by "φ".

(2) The specifications and sizes of PVC-U water supply pipes are: φ20, φ25, φ32, φ40, φ50, φ63, φ75, φ90, φl10, φ125, φ140, φ160, φ180, φ200, φ225, etc., which are basically not produced by domestic enterprises.

There are several specifications of pipes such as φ125, φ140, φ180, φ225, etc. Therefore, try to avoid choosing these types of pipes in engineering design and adoption.

(2) At present, the largest specification of domestic pipelines is φ800 pipes produced by Hebei Baoshuo Pipe Branch. Ronglin Plastic Co., Ltd. can produce φ710 pipes. It is recommended to avoid designing pipes with diameters above φ800 in the design of PVC-U pipes, and use pipes with diameters below φ630.

It is appropriate.

(3) National standard PVC-U pipes and traditional national standard pipes can generally be matched. The corresponding relationship between the nominal diameters of national standard PVC-U pipes and traditional national standard pipes: φ20-DNl5, φ25-DN20, φ32-DN25, φ40

-32, φ50-DN40, φ63-DN50, φ75-DN65, φ90-DN80, φ11O-DNl00, φ160-DNl50, etc.

3. The interface mode of the pipeline is specified.

(1) There are generally three types of interfaces for water supply pipes: rubber ring interfaces, glue-bonded interfaces, and flange connections.

A. The rubber ring interface method is to expand one end of the pipe into a concave socket through an automatic expanding machine, and put a flexible rubber sealing ring on it. In addition, the unexpanded end of the pipe is inserted into the socket with a sealing ring.

Complete the connection.

B. The method of glueing the interface is to expand one end of the pipe into a smooth socket, apply special glue to the surface of one end of the other unexpanded pipe and the inner surface of the expanded socket, and then socket them together to complete the connection.