• DUCTILE IRON PIPES C Class DN1100 System 1
  • DUCTILE IRON PIPES C Class DN1100 System 2
  • DUCTILE IRON PIPES C Class DN1100 System 3
DUCTILE IRON PIPES C Class DN1100

DUCTILE IRON PIPES C Class DN1100

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Ductile Iron Cast Pipe is without any defects compare with tradition casting tech, which has many advantages particularly as follow:

(1) High density. In the "vertical upward casting" process, the melt iron of centre liquid column in center crystallizer is continuously feeding for volume shrinkage caused by condensation tube at outer circumference , which lead to be free of shrinkage porosity.

(2) High purity. When melt iron pouring, the mixed impurities such as gas, dross, sand grain which are lighter than melt iron could be eliminated at furnace mouth, its impossible to enter into the crystallizer through the channel, so the melt iron into the crystallizer is very pure.

(3) Strength with toughness. The cooling speed provided by continuous crystallizer is 30 times than sand casting and 5 times than centrifugal casting, and doesn't produce white iron, the eutectic cell volume of continuous cast iron is one eighth to one tenth compare with traditional cast iron. The density of graphite nodule in ductile iron can reach 300-700 pcs/mm2. Therefore, all reason above improve the strength and toughness of continuous cast iron.

(4) Free machining. The high speed cooling make the hardening phase (such as boride, steadite) not appear like reticular, massive or thick, but diffuse like fish bone and pane in shape, moreover, there are tiny graphite flakes inlaid hardening phase. It's free machining in BrinellHardness the range of 250-300HB. However, the Brinell Hardness of 250 is top limit to common metal materials.

(5) Uniform composition of tube wall. The convection mixing of liquid column caused by marching type drawing in crystallizer make the composition of tube wall well-distributed, and concentration gradient very little.

(6) High productivity. To the wall thickness of tube under 10mm, the speed of continuous casting is 1 meter/min, to the wall thickness of tube under 20mm, the speed of continuous casting is 0.5 meter/min, which is high efficiency that centrifugal or other casting tech couldn't reach.


Q:Can ductile iron pipe be used in high-pressure applications?
Indeed, high-pressure applications can utilize ductile iron pipe. Ductile iron pipe possesses impressive strength and durability, rendering it appropriate for diverse applications, particularly high-pressure systems. Its tensile strength and yield strength surpass those of alternative cast iron pipes, enabling it to endure elevated pressures. Moreover, ductile iron pipe resists corrosion and upholds its structural integrity even amidst high-pressure conditions. Nonetheless, it is crucial to guarantee the accurate installation of the pipe and adherence to all essential safety measures to ensure the secure and efficient operation of the high-pressure system.
Q:How are ductile iron pipes protected against abrasion or wear?
Various methods and protective coatings are utilized to protect ductile iron pipes against abrasion or wear. One commonly employed method involves the application of cement mortar lining on the inner surface of the pipe. This creates a smooth and durable layer that effectively resists the damaging effects of flowing water and other substances passing through the pipe. Furthermore, external protection for ductile iron pipes can be achieved by applying a bituminous or epoxy coating. These coatings act as a barrier, safeguarding against external factors like soil or chemicals that may lead to wear or corrosion. By serving as a protective layer, they prevent direct contact between the iron pipe and the surrounding environment. Moreover, in areas where severe abrasion or wear conditions are prevalent, special linings or coatings can be applied. Polyethylene encasement or polyurethane lining can be utilized to provide enhanced protection against abrasion, especially in regions where the pipe is exposed to high turbulence or abrasive materials. In certain cases, ductile iron pipes can also be reinforced with additional materials such as fiberglass or steel wire to increase their resistance to abrasion or wear. These reinforcements offer an extra layer of protection, strengthening the pipe and reducing the likelihood of damage. Overall, ductile iron pipes are designed with a combination of protective measures to ensure their durability and resistance to abrasion or wear. These measures encompass cement mortar linings, protective coatings, special linings or coatings for severe conditions, and reinforcements. These protective methods play a crucial role in prolonging the lifespan of the pipes and maintaining their functionality even in challenging environments.
Q:Can ductile iron pipes be used for both water and sewer applications?
Yes, ductile iron pipes can be used for both water and sewer applications. Ductile iron pipes have excellent strength, durability, and corrosion resistance, making them suitable for carrying both water and sewage. They are commonly used in various water supply and wastewater systems due to their ability to withstand high pressure and resist chemical reactions caused by sewage.
Q:Can ductile iron pipes be used in contaminated soil conditions?
Yes, ductile iron pipes can be used in contaminated soil conditions. Ductile iron is known for its strength, durability, and corrosion resistance, making it suitable for various soil conditions, including those contaminated with chemicals or other pollutants. The material's resistance to corrosion ensures that the pipes can withstand the harsh conditions and maintain their structural integrity over time. However, it is important to consider the type and level of contamination in the soil and consult with experts to determine if any additional protective measures or coatings are required to ensure the long-term performance of the pipes.
Q:Can ductile iron pipes be repaired if they are damaged?
Ductile iron pipes can undergo repairs if they sustain damage. The necessary repair method will depend on the extent of the damage. In instances where the pipe is cracked or has small holes, a repair clamp or a stainless-steel sleeve can be utilized to seal the affected area. These approaches offer a temporary solution, allowing water to continue flowing until a more permanent fix can be implemented. For more severe damage, such as significant cracks or broken segments, a complete replacement may be required. This process entails removing the damaged section of the pipe and installing a new piece. It is a specialized task that demands specific equipment and expertise, but it effectively restores the pipe's functionality. It is crucial to note that only trained professionals with experience in working with ductile iron should carry out the repairs. This ensures proper execution and safeguards the integrity and safety of the pipeline system. Regular inspection and maintenance of ductile iron pipes can aid in early detection of potential issues, preventing extensive damage that may necessitate replacement instead of repair.
Q:Can ductile iron pipes be used for underground slurry pipelines?
Underground slurry pipelines can utilize ductile iron pipes, as they possess strength, durability, and resistance to corrosion, making them suitable for various applications. Their qualities make them reliable and cost-effective in transporting mixtures of solids and liquids over long distances. Ductile iron pipes can endure the abrasive nature of slurry and the external loads associated with underground installation, owing to their inherent toughness and flexibility. Moreover, they can be easily connected through different methods, ensuring a secure and leak-free pipeline system. Nonetheless, it is crucial to assess the specific properties of the slurry being transported and seek professional advice to determine the suitable pipe specifications and design considerations for the underground slurry pipeline.
Q:How does ductile iron pipe perform in high-temperature steam applications?
Ductile iron pipe performs quite well in high-temperature steam applications. Ductile iron is a strong and durable material, known for its ability to withstand high pressures and temperatures. When exposed to high-temperature steam, ductile iron pipes maintain their structural integrity and do not deform or crack easily. They have a high resistance to thermal expansion and contraction, making them suitable for applications where temperature variations are common. Additionally, ductile iron pipes have excellent corrosion resistance, which is especially important in steam applications where the presence of moisture can lead to accelerated corrosion. Overall, ductile iron pipes are a reliable choice for high-temperature steam applications, providing long-lasting performance and ensuring the safe and efficient transportation of steam.
Q:What are the different joint types available for ductile iron pipes?
Ductile iron pipes offer various joint types that are essential for maintaining the integrity and reliability of the pipeline system. 1. The push-on joint is the most prevalent joint used for ductile iron pipes. It involves inserting a rubber gasket into the bell end of the pipe and then pushing the spigot end into the bell, ensuring a tight seal. This joint is easy to assemble, quick, and has excellent resistance against soil movement and water pressure. 2. The mechanical joint involves a gland and follower that are secured around the spigot end of the pipe using bolts and nuts. It provides a robust and durable connection and is commonly used for larger diameter pipes or applications that expect higher pressure or thrust loads. 3. Flanged joints are utilized when connecting pipes to other components like valves or fittings. The pipe ends are machined and equipped with flanges that are bolted together using gaskets, ensuring a secure connection. These joints find frequent use in industrial applications or situations requiring frequent disassembly. 4. Restrained joints are designed to withstand significant external forces and prevent separation or pulling apart of the pipe. They typically combine mechanical joint components, such as bolts and glands, with additional restraining elements like welded or bolted-on restraints. These joints are commonly employed in high-pressure applications or situations where substantial external forces are present. Choosing the appropriate joint type is crucial and depends on factors such as pipeline design, operating conditions, and installation requirements. Seeking guidance from experienced engineers or pipe manufacturers can aid in determining the most suitable joint type for a specific ductile iron pipe application.
Q:What is the expected fatigue life of ductile iron pipes under cyclic loading?
The expected fatigue life of ductile iron pipes under cyclic loading can vary depending on various factors such as the magnitude and frequency of the cyclic loading, the quality of the material, the design and installation of the pipes, and the environmental conditions. Ductile iron is known for its high strength and ductility, which enables it to withstand cyclic loading to a certain extent. However, like any other material, it is also susceptible to fatigue failure over time. To estimate the expected fatigue life of ductile iron pipes, engineers often utilize fatigue analysis and testing methods. These methods involve subjecting representative samples of the pipes to cyclic loading under controlled conditions and measuring the number of cycles required for failure to occur. The results of these tests are then used to extrapolate the expected fatigue life of the pipes under similar loading conditions. It is important to note that the expected fatigue life can vary significantly depending on the specific conditions and loading patterns experienced by the pipes in a given application. Therefore, it is crucial to consider factors such as the operational demands, maintenance practices, and the overall structural integrity of the pipeline system. Additionally, the use of appropriate design standards and guidelines, along with regular inspection and maintenance, can help enhance the fatigue life of ductile iron pipes. In summary, while it is challenging to provide a specific value for the expected fatigue life of ductile iron pipes under cyclic loading, engineers can estimate it through fatigue analysis and testing methods. It is essential to consider various factors and maintain the pipes properly to ensure their longevity and prevent potential failures.
Q:Can ductile iron pipe be used for both water and wastewater applications?
Yes, ductile iron pipe can be used for both water and wastewater applications. Ductile iron has excellent strength, durability, and corrosion resistance, making it suitable for conveying both clean water and wastewater effectively and safely.

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