At present, the pipes supplied on the market are mainly composed of galvanized steel pipe, plastic lined galvanized steel pipe, PVC plastic pipe, PP-R plastic pipe, aluminum-plastic composite pipe, copper pipe, plastic coated copper pipe, stainless steel lined plastic pipe, stainless steel outer plastic pipe, Heilongjiang stainless steel pipe, etc.
The main characteristics of these pipes are different. Let's analyze them one by one, and then select the correct and reasonable use of automatic
Pipe Cutting Machine to process pipes.
Galvanized steel pipe: cheap, high mechanical strength, but easy to rust, the inner wall of the pipe is easy to scale and reproduce bacteria, and the service life is short. In the field of water supply, it is to eliminate prohibited products.
Lined plastic galvanized steel pipe: it is a product with incomplete consideration. It makes the pipeline bulky, increases the production cost, and fails to eliminate the shortcomings of the most easy corrosion damage and short service life at the connecting thread of galvanized steel pipe. Therefore, it is a product that is not suitable for application.
PVC and PP-R pipes: both belong to plastic pipes, which are characterized by easy manufacture, light weight and low price. However, it has low mechanical strength, poor damage resistance, easy aging and slight toxicity (although polypropylene is non-toxic, plasticizer and color masterbatch have certain toxicity). If the adulteration of the manufacturer decreases, it is difficult to judge the quality, so it is only applicable to the occasions with low requirements and short-term application.
Aluminum plastic composite pipe: it has the advantages of easy bending, small number of pipe joints for long-distance transportation, convenient pipe transportation and so on. However, there is a serious bottleneck at the connection between the pipe and the joint, resulting in a great loss of flow. Moreover, if the connection between the pipe and the joint is more than twice, the pressure resistance and drawing resistance will be significantly reduced after repeating the device. In addition, because the joint is made of brass, copper green is easy to occur on the joint of nickel alloy pipe, and harmful metal substances such as lead may be separated on the surface, so now the aluminum-plastic composite pipe is generally not used for the transportation of direct drinking water.
Copper tube: it can inhibit bacterial reproduction for a certain period. Mechanical strength and damage resistance of rubber products are also good, but they are not acid resistant, and are easy to oxidize and produce aeruginosa in humid environment. Aeruginosa is also a toxic substance. In addition, because its thermal conductivity is too large, excellent thermal insulation treatment must be made if it is used to transport hot water.
Plastic compound copper pipe: although it eliminates the disadvantage of too fast heat dissipation of copper pipe, it leads to an increase in production cost. The outer compound plastic layer is easy to age and shorten the service life.
Stainless steel lined plastic pipe and external compound plastic pipe: it is a product with incomplete consideration. Because the service life of stainless steel and plastic is too different, it is also a product that should not be promoted.
Thick wall all stainless steel pipe: it is the most ideal pipe for use because it has many advantages, such as corrosion resistance, no pollution, excellent mechanical function, good damage resistance, low thermal conductivity, durability, luxurious appearance and so on. Because of this, all stainless steel pipeline system has been selected for a long time in the pharmaceutical, chemical and beverage packaging industries. Some regional water supply networks in Japan and Germany have adopted all stainless steel pipeline system. However, the traditional thick wall stainless steel pipeline system has not been applied in the field of municipal water supply and construction water supply because of the high consumption and high price of stainless steel materials and the restriction of economic capacity.
