Compared with other metal pipes and plastic pipes, cast iron drainage pipes have some unique advantages, such as high strength, low noise, long life, fire retardant, flexible anti-seismic, non-secondary pollution, renewable recycling and so on.
1. Low noise, high intensity and long life
The flow of drainage pipe is not full and gravity flow. Noise caused by friction, shock and vibration is unavoidable.
Graphite in cast iron can buffer vibration energy, prevent the transfer of vibration energy between grains, and convert vibration energy into heat energy. So cast iron pipes have good shock absorption and noise reduction. The test data show that the noise value of cast iron pipe is 46.5 dB and that of U-PVC pipe is 58 dB when the flow rate of DN100 pipe is 2.7 L/s. Therefore, cast iron drainage pipe should be selected in quiet residential buildings, schools, hospitals, meeting places and hotels.
The tensile and bending strength of cast iron is four times that of common plastic pipe PVC.
The matrix structure of cast iron has small potential difference, small electrochemical effect and high silicon content, which can form a continuous SIO 2 protective film on the surface. Therefore, its corrosion resistance is much higher than that of steel. In the same environment and medium, the corrosion resistance of cast iron is more than three times that of steel.
Cast iron drainage pipes have excellent corrosion resistance and strength characteristics, which make their service life much longer than steel pipes and plastic pipes.
2, flexible anti-seismic
The linear expansion coefficient of cast iron is relatively low, so it has little expansion due to the influence of ambient temperature. At the same time, the flexible joint structure of cast iron drainage pipe has high flexibility, flexural deformation and seismic resistance. The joint of the system has no leakage within 35 mm in axial deformation and 31.5 mm in transverse vibration flexure.
3. High Temperature Resistance, Flame Retardant and Fire Protection
Drainage pipes have the characteristics of penetrating and connecting all floors and rooms. Once a fire occurs, if the drainage pipes are easy to melt and have poor flame retardancy, the smoke stove effect will be formed when they melt and burst quickly. The fire retardant and high melting point of cast iron pipe have good fire retardant property.
4. No secondary pollution, renewable recycling
Cast iron material itself does not contain chemical toxins, and will not cause secondary pollution to pollution and wastewater. When the construction or drainage pipeline is removed at premium, cast iron drainage pipe can be 100% recycled and recycled.