Various pipe diameter specifications: ductile iron pipe has a variety of pipe diameters to choose from, as small as DN80mm, as large as DN2600mm or even larger. In the urban water supply network, the large-diameter ductile iron pipe can be used for the main pipe to transport water, which can meet the demand of large-scale water supply. In the water supply network within the community or factory, smaller pipe sizes can be used for branch pipes to accurately deliver water to each user terminal.

for ductile iron and other iron pipes, has a high ability to withstand water pressure, but also to withstand the external load, but also to adapt to various geological conditions. The strength of the pipe is very high, and it also has certain advantages in hardness, corrosion resistance, flexibility and so on.

Nodular cast iron and gray cast iron have great differences in solidification characteristics, mainly in the following aspects:

clean the rubber ring cover and the rubber ring cover, wipe off any adhesive dirt, put the rubber ring cover in the socket in the figure 8 groove, and along the rubber ring cover compacts around it.

Quality testing: After the construction is completed, the quality of the polyethylene outer coating should be tested, mainly to check the thickness, adhesion, pinhole and other indicators of the coating. The coating thickness was measured by magnetic thickness gauge, the adhesion was measured by grid method, and the pinhole was detected by high voltage EDM tester. If the problem is found, timely repair or rework treatment to ensure the quality and protective performance of the outer coating.

The durability of ductile iron pipe network can be improved from the aspects of improving the performance of the pipe itself, strengthening external protection, controlling construction quality and optimizing operation and maintenance. The specific methods are as follows:

Adding alloying elements: In the production of ductile iron pipes, some alloying elements such as nickel, molybdenum, copper and so on are often added. These alloying elements can refine the grain, improve the strength and toughness of cast iron, and thus enhance the pressure resistance of the pipeline. For example, nickel can improve the toughness and fatigue resistance of cast iron, molybdenum can enhance the strength and hardness of cast iron, in some high-pressure pipeline, add the right amount of nickel and molybdenum, can make ductile iron pipe withstand higher pressure.

Ductile iron pipe is widely used in municipal water supply, drainage, gas transmission and other fields because of its excellent mechanical properties, corrosion resistance and economy. However, in the actual use process, the pipe network system may be affected by periodic load, temperature change, soil settlement and other factors, resulting in fatigue damage, which will affect the service life and safety of the pipeline.