In drinking water, PE is generally used as a cold water pipe; PPR (special hot water material) can be used as a hot water pipe; and PPR (cold water material) can be used as a cold water pipe;

If it is to do hot water pipe, of course, PPR is good;

(If it is a drinking water pipe in the home, then there is no difference, basically all use PPR than PE)

If you are doing a cold water pipe, you can refer to the following differences:

I. Comparison of temperature resistance between PPR water pipe and PE water pipe

Under normal use, the PE water pipeline has a maximum stable temperature of 70 ° C and a minimum temperature of -30 ° C. That is to say, in such a temperature range, long-term use of PE water pipes is safe and reliable.

Under normal use, the PPR water pipeline has a maximum stable temperature of 70 ° C and a minimum temperature of -10 ° C. It also shows that in such a temperature range, long - term use of PPR water pipes is safe and reliable. It is concluded that the PE water pipe has the same high temperature resistance as the PPR water pipe. However, PE pipes are superior to PPR pipes in low temperature performance.

Second, the difference between PE water pipe and PPR water pipe in terms of hygiene

PE pipe is the main chemical molecular component of polyethylene. Readers of organic chemistry know that the composition of this product is two carbon atoms combined with five hydrogen atoms, one of which is combined with a carbon atom by a double bond, and then ethylene The single molecule is polymerized in a certain way, and such a product is a polyethylene product. So what is the PPR water pipe? The main component of the PPR water pipe is propylene, that is, three carbon atoms are combined with seven hydrogen atoms, and one of the hydrogen atoms and the carbon atoms is bonded by a double bond, and then the polymerized product is a polypropylene product. Such products are almost the same in terms of health and safety. What is important is whether the raw materials used by the company are not suitable, rather than the difference between the two products. There is no basis for propagating PE pipes in newspapers that are more hygienic than PPR pipes. All qualified PE water pipes and PPR water pipe products must be sanitized (except those for counterfeit and shoddy products). It is said that PE water pipes are more hygienic and safer than PPR water pipes, and they are also deceiving to consumers.

Third, the modulus of elasticity

The elastic modulus of PPR water pipe is 850MPa. The PE water pipe belongs to medium density polyethylene. The elastic modulus is only about 550MPa. It has good flexibility and insufficient rigidity. It is used in the construction water supply field. The straightness of the pipe is not good, it is easy to bend and easy to deform. Not beautiful.

Thermal conductivity: PPR water pipe is 0.24, PE water pipe is 0.42, nearly doubled. If it is used in floor heating, this is its strength. The good heat dissipation indicates that the heat radiation effect is better, but it is used in the hot water pipe. Disadvantages, good heat dissipation, large heat loss, higher surface temperature of the pipe, easy to hot.

Fourth, weldability

Although PPR water pipes and PE water pipes can be hot-melt welded, PPR water pipes are easier to operate, PPR water pipes are rounded, and PE water pipes are irregularly flanged and easy to block; welding temperatures are also different, PPR water pipes are 260 ° C, PE water pipes. At 230 ° C, the PPR water pipe special welding machine on the market is easy to over-weld and cause water leakage. In addition, since the PE water pipe material is easily oxidized, a special tool must be used to scrape off the scale of the surface before welding, otherwise the integrated pipe in the true sense cannot be formed, and the pipe is prone to water leakage, so the construction is more troublesome.

5. Low temperature impact strength:

This point is the strength of PE water pipe material from the index. PPR water pipe is stronger than PE water pipe. PE water pipe is more flexible than PPR water pipe. This is determined by the nature of the material, but it is meaningless to exaggerate the problem of cold and brittleness of PPR water pipe. PPR water pipes have been used in China for more than ten years. The production enterprises have gradually reduced the hidden dangers caused by improper handling through effective packaging and enhanced publicity. Barbaric handling and construction will also cause PE water pipes. Surface scratching and stress cracking; any pipe must be insulated during use under low temperature conditions, otherwise the pipe will be cracked due to volume expansion caused by icing.

Sixth, pipe size

The maximum size of the PE pipe can be dn1000, and the maximum specification of PPR is dn160. Therefore, the PE pipe is used as a drain pipe, and the water supply pipe is generally PPR.

Editor in charge: Wang Zhen

Hydraulic Pump

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