Both UPVC pipe and PE pipe are thermoplastic pipes, they have one aspect in common, but in flexibility. heat resistance requirements. There are also differences in technical properties such as anti-aging. Now the technical characteristics of UPVC pipe and PE pipe are compared and analyzed as follows:
1. Performance comparison between UPVC and PE pipes
Types of Pipe Advantages Disadvantages UPVC is corrosion resistant, easy to connect, inexpensive, and tough. Not suitable for hot water transportation, high requirements for joint bonding technology and long curing time. HDPE is light in weight, has good fatigue strength, good temperature resistance, good toughness, and good flexibility. Welding requires electricity; mechanical connectors are more expensive.
As can be seen from the above table, the PE pipe is more expensive because of the joints it connects, which restricts and hinders its wide application.
2. Linear expansion coefficient of UPVC and PE pipes
Pipe Linear expansion coefficient a (/0C) UPVC (hard polyvinyl chloride) 6×10-5 HDPE (high-density polyvinyl chloride) 18×10-5 MDPE (low-density polyvinyl chloride) 16×10-5
It can be seen that PE pipe has a larger coefficient of linear expansion than UPVC pipe, so it should be paid attention to in the design.
3. Comparison of aging resistance of UPVC pipes
Developed countries on PVC. The comprehensive evaluation of PE pipes is as follows:
Content Evaluation value PVC HDPE MDPE Aging resistance value 20 13
It can be seen from the above table: in terms of aging resistance and long-term strength, PVC pipe is better than PE pipe; in terms of damage form, PE is better than PVC. As for rollability and weldability, it is only related to the installation process. Transportation, etc., should not be used as the main indicator for evaluating the two materials.
4. Installation and connection form of UPVC pipe and PE pipe
As mentioned earlier: the connection method of UPVC pipe has a socket and a rubber ring connection. For bonding connection and flange connection, it is more suitable to use socket rubber ring connection for pipes with larger diameters. If the bonding connection is used, it is difficult to ensure the absolute cleanliness of the pipe joint before bonding, just a grain of sand. A small bubble will be the hidden danger of the interface leaking. In addition, the bonding is also affected by temperature and air, and it is difficult to construct outdoors.
The connection forms of PE pipes include electric hot melt connection and hot melt butt connection. Especially for the electric heat fusion connection, it uses a sleeve to cover the joints of the two pipes, and the electric heating wire inside the sleeve is heated to make the sleeve and the two pipes fuse together. leaks, but this sleeve-type joint is expensive.