C40 ductile iron pipe, also known as C40 nodular cast iron pipe, represents a significant advancement in piping materials. Below is a concise introduction to C40 ductile iron pipe.

Characteristics and Advantages

1. High Strength and Pressure Resistance:

   • C40 ductile iron pipe has a high tensile strength of 420 MPa and a yield strength of at least 300 MPa, enabling it to withstand significant pressures and loads.
   • It is classified with a pressure rating of C40, which corresponds to an allowable working pressure of 4.0 MPa.

2. Excellent Corrosion Resistance:

   • The pipe's outer surface is typically zinc-coated, providing effective protection against atmospheric oxidation and enhancing its corrosion resistance.
   • The inner wall of the pipe is smooth, reducing the accumulation of dirt and lowering the flow resistance of water or other fluids within the pipe.

3. Good Sealing Performance:

   • C40 ductile iron pipe features tight connections, ensuring the safe operation of the pipeline system.
   • The use of rubber ring sealing in pipe connections further enhances the sealing performance and prevents leakage.

4. Long Service Life:

   • Due to its high strength, corrosion resistance, and good sealing performance, C40 ductile iron pipe has a long service life, often lasting for decades.

5. Ductility and Seismic Performance:

   • C40 ductile iron pipe possesses good ductility and seismic performance, capable of automatically recovering its shape under external forces such as earthquakes, reducing the risk of pipe damage.

Applications

C40 ductile iron pipe is widely used in various fields due to its superior performance:

1. Urban Water Supply Pipelines:

   • Its corrosion resistance and high strength ensure a stable water supply over the long term, unaffected by external environments.
   • The smooth inner wall of the pipe prevents the accumulation of scale, ensuring the hygienic safety of the water supplied.

2. Urban Drainage Systems:

   • C40 ductile iron pipe can withstand significant water pressure and impact forces, making it suitable for use in urban drainage systems.
   • The smooth inner wall of the pipe maintains smooth drainage, reducing the accumulation of sewage and odor generation.

3. Gas Transmission Pipelines:

   • Its corrosion resistance and high strength ensure the safe operation of gas transmission pipelines, unaffected by gas corrosion and pressure.

Standards and Specifications

C40 ductile iron pipe complies with the ISO2531:2009 international standard, which classifies pipes based on their allowable working pressure ratings. The pipe's specifications include a nominal diameter range and various wall thicknesses to meet different application requirements.

In summary, C40 ductile iron pipe is a robust and reliable piping material with high strength, corrosion resistance, and good sealing performance. It is widely used in urban water supply, drainage, and gas transmission systems, contributing to the safe and efficient operation of these critical infrastructure systems.