1. Aluminum-plastic composite pipe
The aluminum-plastic composite pipe is the first water supply pipe to replace the cast iron pipe. Its basic structure should be five layers, namely plastic, hot melt adhesive, aluminum alloy, hot melt adhesive, and plastic from the inside to the outside.
The aluminum-plastic composite pipe has good thermal insulation performance, the inner and outer walls are not easy to corrode, because the inner wall is smooth, the resistance to fluid is small; and because it can be bent at will, it is convenient to install and construct. As a water supply pipeline, the aluminum-plastic composite pipe has sufficient strength, but if the lateral force is too large, the strength will be affected. Therefore, it should be constructed as an open pipe or buried in the wall, but not buried in the ground. The connection of the aluminum-plastic composite pipe is of the ferrule type, so the first step in the construction is to pass a strict pressure test to check whether the connection is firm. The second is to prevent frequent vibration and loosen the ferrule. The third is to leave enough installation amount in the length direction to avoid pulling off.
2. Plastic-clad copper pipe
The plastic-clad copper pipe uses pure copper (red copper) as the pipe fittings and is covered with PE plastic. From the perspective of comprehensive performance, the plastic-clad copper pipe is slightly better than the aluminum-plastic composite pipe. For example, the strength is better, life is longer, and the heat resistance is better. But the heat preservation performance is slightly worse.
Pure copper has extremely high corrosion resistance. After a period of use, a layer of green oxide will appear on the inner surface. However, there is no effect on the life, flow, and resistance of the pipe to the fluid. The patina is not harmful to human health and has a certain ability to kill bacteria.
There are two installation methods for plastic-clad copper pipes: ferrule type and welding type. The welding type is more reliable.
3. Copper pipe, stainless steel pipe:
In addition to poor thermal insulation performance, other indicators such as strength and life resistance to fluid are very good for this type of pipe. It is suitable for cold water pipes. If it is used for hot water transportation, an insulation sheath should be added. The main connection method is the ferrule type, and the copper tube can also be welded.
4. Lined plastic galvanized cast iron pipe:
That is to say, a layer of plastic is lined on the inner wall of the ordinary galvanized pipe to make it have corrosion resistance, low resistance, good insulation performance, and at the same time have the characteristics of high strength of the galvanized pipe itself. Most of these pipes are connected by ribs.
5. Plastic pipe:
As long as the material selection of the plastic pipe meets the standard requirements, it can have sufficient strength, life, safety, and hygiene. It has the best thermal insulation performance among all pipes. The plastic pipe is welded by a hot melt, which is highly reliable. As long as the construction is correct, there will be no leakage and fall off at the pipe welding place after the pressure test.
Post time: Nov-13-2023