Views: 0 Author: Site Editor Publish Time: 2021-05-07 Origin: Site
HDPE pipe is a pipe made of high-density polyethylene (English name "High Density Polyethylene", referred to as "HDPE"). HDPE pipe is a replacement product of traditional steel pipe and PVC drinking water pipe. So what exactly is HDPE pipe?
What kind of pipe is HDPE pipe?
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HDPE pipe is mainly made of material HDPE. High-density polyethylene, the English name is "High Density Polyethylene", or "HDPE" for short. HDPE is a non-polar thermoplastic resin with high crystallinity. The appearance of the original HDPE is milky white, and the thin part is translucent to a certain extent. HDPE has good electrical properties, especially the high dielectric strength of the insulator, making it very suitable for wires and cables. The medium and high molecular weight grades have excellent impact resistance even at room temperature and at low temperatures of -40F.
Although HDPE was introduced in 1956, this plastic has not yet reached a mature level. HDPE pipe is constantly developing its new uses and markets.
HDPE pipes must bear a certain pressure, usually high molecular weight PE resin with good mechanical properties, such as HDPE resin. LDPE resin has low tensile strength, differential pressure resistance, poor rigidity, poor dimensional stability during molding, and difficulty in connection, so it is not suitable as a material for water supply pressure pipes. However, due to its high hygienic index, LDPE, especially LLDPE resin, has become a common material for the production of drinking water pipes. LDPE and LLDPE resins have low melt viscosity, good fluidity and easy processing, so their melt index can be selected in a wide range, usually MI is between 0.3-3g/10min.
Several issues need to be paid attention to in the promotion of the use of HDPE pipes
The unit price of HDPE pipes is 11% lower than that of ductile iron pipes. Therefore, the company finally decided to use HDPE water supply pipes.
Vigorously strengthen the science education of HDPE pipes, improve people's understanding of HDPE pipes, and promote the popularization and application of HDPE pipes.
Formulate a unified national pipeline design specification and construction acceptance specification as soon as possible. As of 2012, there is no national unified pipeline design specification and construction acceptance specification for HDPE pipes.
Strengthen the quality training of pipeline designers and construction and installation personnel, because HDPE pipes have higher requirements for installation technology, so as to avoid design problems and rework due to lack of responsibility of the design and construction personnel.
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