DUCTILE IRON PIPES C Class DN200

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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 pipes be used for geothermal systems?: Yes, ductile iron pipes can be used for geothermal systems. Ductile iron is known for its strength, durability, and corrosion resistance, making it suitable for various applications including geothermal systems. These pipes can handle high temperatures and pressure fluctuations commonly found in geothermal systems. Additionally, ductile iron pipes have excellent thermal conductivity properties, allowing for efficient heat transfer between the geothermal fluid and the surrounding environment. Therefore, ductile iron pipes are a viable option for transporting geothermal fluids in geothermal systems.

Q:How do ductile iron pipes handle ground movement in earthquake-prone areas?: In earthquake-prone areas, ductile iron pipes are highly regarded for their exceptional resistance to ground movement. These pipes are specifically designed to endure external forces, including seismic activities and shifting ground. The remarkable flexibility of ductile iron pipes allows them to effectively absorb and distribute the energy generated during ground movement. This flexibility is achieved through the unique composition of ductile iron, which contains nodular graphite in its microstructure. The presence of nodular graphite grants the pipe with ductility and resilience, enabling it to deform under stress without breaking. During an earthquake, when the ground begins to shift, ductile iron pipes have the capacity to adapt to the changing conditions. They can elongate, compress, and bend, thereby reducing the likelihood of pipe failure. This characteristic is of utmost importance in earthquake-prone areas, as it helps prevent catastrophic failures and water loss that may occur with more rigid pipe materials. Furthermore, ductile iron pipes possess a high level of joint integrity, further enhancing their ability to withstand ground movement during seismic events. The joints of these pipes are engineered to withstand lateral and angular movement, ensuring their integrity and preventing leaks. In addition to their inherent flexibility, ductile iron pipes are often installed using techniques that enhance their resistance to ground movement. Anchoring systems, such as thrust blocks and restraints, can be employed to secure the pipes and prevent excessive movement. These systems contribute to the stability of the pipeline network and further minimize the potential for damage during earthquakes. Overall, the combination of ductility, joint integrity, and anchoring systems make ductile iron pipes an exceedingly reliable choice for managing ground movement in earthquake-prone areas. They offer a durable and resilient solution that can withstand the challenges posed by seismic activities, guaranteeing a continuous water supply and minimizing the risk of infrastructure damage.

Q:Are ductile iron pipes suitable for use in paper mills?: Yes, ductile iron pipes are suitable for use in paper mills. Ductile iron is known for its high strength and durability, making it an excellent choice for various industrial applications, including paper mills. These pipes can withstand high-pressure systems and are resistant to corrosion, making them suitable for transporting water, chemicals, and other fluids commonly used in paper mills. Additionally, ductile iron pipes have good impact resistance, which is beneficial in an environment where heavy machinery and equipment are often present. Overall, ductile iron pipes are a reliable and long-lasting option for paper mills due to their strength, durability, corrosion resistance, and ability to handle high-pressure systems.

Q:Are ductile iron pipes resistant to corrosion?: Yes, ductile iron pipes are highly resistant to corrosion.

Q:How does ductile iron pipe perform in areas with high soil compaction?: Ductile iron pipe performs well in areas with high soil compaction due to its strong and durable characteristics. Its flexible nature allows it to withstand the pressure exerted by compacted soil, preventing deformation or damage. Additionally, the material's high tensile strength and resistance to cracking make it an ideal choice for areas where soil compaction is a concern.

Q:Can ductile iron pipes be used in areas with high levels of industrial effluents?: Yes, ductile iron pipes can be used in areas with high levels of industrial effluents. Ductile iron is a type of cast iron that has enhanced flexibility and strength, making it highly resistant to corrosion and abrasion. This makes it suitable for handling various types of industrial effluents, including those with high levels of chemicals, acids, or other corrosive substances. Ductile iron pipes have a protective lining, such as cement mortar or polyethylene, which further enhances their resistance to chemical attack. These linings prevent the effluents from coming into direct contact with the iron material, ensuring the longevity and integrity of the pipes. Moreover, ductile iron pipes have been used extensively in industrial applications where corrosive environments are present. They have proven to be durable and reliable, with a long service life, even in challenging conditions. Proper maintenance and regular inspections are essential to ensure the continued performance of ductile iron pipes in areas with high levels of industrial effluents. It is crucial to consider the specific characteristics of the effluents and consult with experts or manufacturers to determine the most suitable pipe materials and linings for the particular industrial environment.

Q:Are ductile iron pipes resistant to acid attacks?: Generally, ductile iron pipes exhibit resistance to acid attacks. Ductile iron, a form of cast iron which has undergone magnesium treatment to enhance its strength and ductility, produces a more durable material capable of withstanding corrosive conditions, including acids. Nevertheless, it is crucial to acknowledge that the resistance level may vary depending on the specific acid type and concentration involved. In highly corrosive environments, where powerful acids or high concentrations are present, it may be necessary to implement additional protective measures such as applying a lining or coating to the pipes. Moreover, regular inspection and maintenance are vital to ensure the long-term durability and resistance of ductile iron pipes.

Q:Are ductile iron pipes more expensive than other pipe materials?: Yes, ductile iron pipes are generally more expensive than other pipe materials such as PVC or HDPE. However, they offer superior strength, durability, and longevity, making them a cost-effective choice in the long run for applications that require high pressure or corrosive resistance. Additionally, ductile iron pipes have a lower life cycle cost due to their reduced maintenance and repair needs.

Q:How do ductile iron pipes handle water velocity?: Due to their unique mechanical properties, ductile iron pipes are well-suited for managing water velocity. Ductile iron, being a highly durable and strong material, can endure high water velocities without significant damage or deformation. The inherent ductility of the pipe enables it to absorb the energy generated by the flowing water, effectively reducing the risk of pipe failure or bursting. This characteristic makes ductile iron pipes suitable for handling high-pressure water flow, making them an ideal choice in situations where water velocity is a concern. Furthermore, the smooth internal surface of ductile iron pipes promotes efficient water flow and minimizes friction losses. This smoothness reduces resistance encountered by the water as it moves through the pipe, allowing for higher water velocities without compromising the pipe's integrity. Moreover, ductile iron pipes can be manufactured in various sizes and thicknesses, providing customization options based on specific water velocity requirements. This flexibility ensures that ductile iron pipes can effectively manage a wide range of water velocities, from low-flow applications to high-velocity scenarios. In conclusion, ductile iron pipes possess exceptional capabilities when it comes to handling water velocity. Their strength, ductility, and smooth internal surface contribute to their ability to withstand high water velocities without compromising their structural integrity, making them a dependable choice for water distribution systems.

Q:Are there any specific standards or specifications for ductile iron pipes?: Ductile iron pipes have specific standards and specifications that must be adhered to. The American Water Works Association (AWWA) and the International Organization for Standardization (ISO) are responsible for establishing the most commonly used standards for these pipes. AWWA has developed the AWWA C151 standard, which covers everything from design and manufacturing to testing, installation, and maintenance requirements for ductile iron pipes used in water and wastewater applications. This standard outlines the materials, dimensions, and mechanical properties of the pipes, as well as the necessary coatings and linings. Similarly, ISO has created the ISO 2531 standard, which provides guidelines for the design, manufacturing, testing, and installation of ductile iron pipes in water and wastewater systems. This standard addresses various aspects, including dimensions, mechanical properties, coatings, and linings. In addition to these well-known standards, there may be other regional or national standards that are specific to certain countries or regions. These standards typically align with the AWWA and ISO standards or may have additional requirements that are specific to local conditions or regulations. Compliance with these standards ensures that ductile iron pipes meet the required quality and performance standards. It also promotes the interoperability and compatibility of ductile iron pipes across different systems and countries, which in turn enables reliable and efficient water distribution and wastewater management.

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