It is used for indoor normal environment and places with high temperature, dust, vibration and fire hazard. It can also be used in wet places. It shall not be used in places especially humid, with acid, alkali, salt corrosion and explosive hazards. The ambient temperature is -15 C ~ +40 C. The good mechanical properties of the line pipe. Excellent corrosion resistance, high pressure resistance of line pipe and more than 2.5Mpa of working pressure. The surface of the tube is smooth, the fluid resistance is small, it is not fouling and it is not suitable for the breeding of microorganism. The coefficient of thermal expansion is small, and the deformation is not contractile. The traditional way of installation and connection. Epoxy coated pipe layer is more effective to solve the corrosion of water, acid, alkali, salt and buried metal pipeline on line wear, service life can reach 50 years.