In order to make the building facade more beautiful, indoor rainwater drainage system has been more and more widely used. Indoor rainwater pipes are generally designed according to non-pressurized flow, but because the rainwater flow is sometimes larger and more concentrated, there are two states of gravity flow and pressure flow in the pipe, so the indoor rainwater pipes are required to withstand pressure better than other drainage pipes.

PVC drainage pipe is a substitute for traditional drainage pipe, which has better physical and chemical properties. Its inner wall is smooth, and the friction resistance is less than that of conventional drainage materials, so the transverse pipe installation slope is smaller, which can improve the indoor net height of the building. At the same time,PVC drainage pipe weight is lighter, for cast iron pipe one-fifth, easy to transport and operation; Adhesive connection, easy installation and maintenance; The price is lower than the conventional drainage pipe, greatly reducing the cost of the project; Strong corrosion resistance, widely used in construction waste water and rainwater pipeline system. In addition, the widespread use of PVC drainage pipe is beneficial to save steel, which has a very important significance for alleviating the situation of our iron and steel shortage. Compared with cast iron pipe and steel pipe,PVC-U drainpipe has the disadvantages of low pressure and weak impact resistance. In addition, although PVC-U drainpipes are non-combustible materials, for indoor open-coated pipes, there is the possibility of fire spreading upward along the drainpipe.

1. Light weight, convenient for transportation and loading and unloading: low density, convenient for transportation, loading and unloading, and construction.
2. Excellent corrosion resistance: It has excellent acid resistance, alkali resistance and corrosion resistance, and is very suitable for use in the chemical industry.
3. Small fluid resistance: The inner wall of the pipe is smooth, its roughness coefficient is only 0.009, and the fluid resistance is small, which effectively improves the hydraulic conditions of the pipe network and reduces system operating costs.
4. High mechanical strength: The pipe has good pressure resistance, impact resistance and tensile strength properties.
5. Simple construction: Pipeline connection construction is quick and easy, and the construction engineering cost is low.
6. Low cost: low price, convenient transportation and construction, and long service life, so the overall cost is low.
7. Does not affect water quality: It has been confirmed by dissolution tests that it does not affect water quality and is suitable for large-scale promotion and application.