At present, the main water pipes for residential decoration are PPR tubes and copper pipes.
PPR: in recent years, PPR tubes have developed rapidly in China, but the quality of products in the market is uneven and there is a mixed phenomenon. Whether the cold water tube or hot water pipe, the material of the tube should be the same, cold, hot water tube is only the wall thickness is different. But currently on the market is relatively common pipe and hot water works better raw materials, and cold water pipe PPB (parts per block polypropylene) as PPR, in this case, because different materials, welding place appear rupture extremely easily, sealing off, LouDi, and so on and so forth.
When purchasing, consumers should pay attention to identifying the label on the pipe. The product name shall be & ldquo; The cold and hot water is used in the control of polypropylene pipe. Or & other PP - R tube material for cold and hot water; , and there are national standards for implementation. GB/T18742-2002 & throughout; . Attention should be paid to the discovery of products under other names or other standards.
In general, the tube series S of the hot water tube should be selected as the pipe material under 2.5, which is the diameter of the pipe wall with 20 diameter of diameter and the thickness of more than 3.4 mm. The thickness of the pipe wall of 25 is more than 4.2 mm. In addition, the linear expansion coefficient of pp-r tube is about 10 times that of the copper tube, and the expansion space should be kept in the construction installation.
Copper: copper has stable chemical properties and is not susceptible to corrosion. The copper tube is much higher than the plastic pipe and can withstand considerable pressure. Compared with steel tube, copper tube has good toughness, which is not cracked under the strong frost heaving and impact. Copper melting point is high, the transmission medium temperature even as high as 200 ℃, can work safely for a long time. Copper pipe has good resistance to permeability, in use process, its surface can form a layer of dense structure, don't be medium dissolved protective film, whether it is fat, carbohydrate, bacteria and viruses and harmful liquid, oxygen or uv are not through its eroding wall.
The current national standard for the copper tube is GB/t18033-2000, the copper tube for water supply is usually T2 or TP2 alloy, and the copper content should be above 99.9%. The disadvantage of brass is that it conducts heat quickly. In order to avoid this defect, it is better to take the insulation layer and reduce the heat loss.
Although there is plastic coated copper tube in the market, its thermal insulation is limited, it is better to put foam rubber tube shell on its outer surface to improve the thermal insulation performance of hot water pipe.
No matter what kind of pipe you choose, the following points should be noted:
1. Use a complete tube to minimize the use of contact.
Try not to walk underground.
3. After the installation of the pipe must be tested, the concealed works should be closed after the test pressure is fine.
4. After installation, you must ask for the warranty and pipeline alignment chart.
5. It is best to install the water pipe manufacturer or professional team.
