DUCTILE IRON PIPES C Class DN800

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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: How do ductile iron pipes handle traffic vibrations?: Ductile iron pipes are known for their exceptional strength and durability, making them highly capable of handling traffic vibrations. The inherent properties of ductile iron make it more resistant to fractures or cracks caused by external forces, including vibrations induced by traffic. The material's high tensile strength and elasticity allow ductile iron pipes to absorb and dissipate the energy generated by traffic vibrations. This helps to minimize the impact on the pipes and prevent any significant damage or failure. Additionally, the ductility of the material allows it to deform slightly under stress without breaking, further enhancing its ability to withstand vibrations. Furthermore, ductile iron pipes have superior resistance to corrosion and other forms of deterioration. This resistance ensures that the pipes maintain their structural integrity over an extended period, even when subjected to repetitive vibrations caused by heavy traffic. Overall, ductile iron pipes are well-equipped to handle traffic vibrations due to their robust nature, ability to absorb energy, and resistance to corrosion. These features make them a reliable choice for underground infrastructure in areas with high traffic volumes, ensuring a long-lasting and efficient pipeline system.

Q: How do ductile iron pipes perform in acidic soil conditions?: Ductile iron pipes have a reputation for being durable and resistant to different environmental conditions, including acidic soil conditions. When exposed to acidic soil, these pipes exhibit excellent resistance to corrosion due to their unique composition and protective coating. The high carbon content in ductile iron pipes gives them inherent resistance to corrosion, even in acidic environments. Additionally, these pipes are typically lined with cement mortar or a suitable epoxy coating, which provides an extra layer of protection against acid attack. The combination of the high carbon content and protective coating creates a barrier that prevents direct contact between the acid and the iron, thus minimizing the risk of corrosion. This ensures that the pipes remain structurally sound and maintain their integrity over a long period of time. Furthermore, ductile iron pipes have a long service life and are designed to withstand a wide range of soil conditions. Their strength and flexibility enable them to endure the stresses and strains caused by the surrounding soil, including acidic soil environments. This makes them an ideal choice for applications in soils with higher acidity levels. It is important to note that while ductile iron pipes perform well in acidic soil conditions, the severity and concentration of the acid can affect their performance. In extremely aggressive or highly concentrated acidic environments, additional corrosion protection measures may be necessary, such as sacrificial anodes or cathodic protection systems. In conclusion, ductile iron pipes are highly resilient and excel in acidic soil conditions. Their corrosion resistance, combined with their strong structure and protective coating, ensures their longevity and reliability, making them a preferred choice for various applications in such environments.

Q: Can ductile iron pipes be used for water distribution networks?: Yes, ductile iron pipes can be used for water distribution networks. Ductile iron pipes are highly durable, corrosion-resistant, and have a long lifespan, making them suitable for transporting water over long distances. Additionally, their flexible nature allows them to withstand ground movement and vibrations, making them a reliable choice for water distribution networks.

Q: How are ductile iron pipes manufactured?: Ductile iron pipes are produced using a technique called centrifugal casting, which employs a spinning mold. The process commences with the selection and preparation of top-notch ductile iron, a form of cast iron containing small quantities of magnesium to enhance its strength and ductility. Initially, the ductile iron is melted in a furnace at exceedingly high temperatures. Once the molten iron attains the desired temperature, it is poured into a rotating mold. Shaped like a pipe, the mold spins at a high speed, ensuring even distribution of the molten iron along its inner surface. While the mold spins, the molten iron cools and solidifies against the mold walls. This swift cooling leads to the formation of a fine-grained structure, thereby augmenting the mechanical properties of the pipe, including its strength and durability. The spinning mold continues to rotate until the pipe solidifies completely, typically within a few minutes. Upon solidification, the pipe is extracted from the mold and any excess material, referred to as the "skin," is eliminated. Typically, machining or grinding is employed to remove the skin, achieving the desired dimensions and surface finish. Subsequently, the pipe undergoes heat treatment to further enhance its mechanical properties and alleviate internal stresses. After the completion of heat treatment, the pipe undergoes a thorough inspection to identify any defects or imperfections. This inspection encompasses visual examinations, non-destructive testing methods, and pressure testing to ensure compliance with the required specifications and standards. If any defects are detected, the severity of the issue determines whether the pipe undergoes repair or is rejected. Lastly, the pipes are coated with a protective layer to prevent corrosion and extend their lifespan. This protective coating can be applied through various methods, such as cement mortar lining, epoxy coating, or zinc coating. In summary, the manufacturing process of ductile iron pipes encompasses iron melting, centrifugal casting, cooling, skin removal, heat treatment, inspection, and coating. This process guarantees the production of high-quality pipes characterized by exceptional strength, durability, and resistance to corrosion.

Q: What are the different types of restrained joints for ductile iron pipe?: There are several different types of restrained joints for ductile iron pipe. These joints are designed to prevent pipe separation or movement due to internal pressure, external forces, or ground movement. Some of the commonly used restrained joints for ductile iron pipe include: 1. Mechanical Restrained Joint: This type of joint uses mechanical devices such as bolts, nuts, and gaskets to hold the pipe in place. The joint is typically made up of a gland, a gland follower, and a restraint ring. The gland and gland follower compress the gasket against the pipe, while the restraint ring provides additional support and resistance against movement. 2. Push-on Restrained Joint: This joint utilizes a rubber gasket that is compressed when the two pipe ends are pushed together. The gasket provides a tight seal and also acts as a restraint against movement. Some push-on restrained joints also include additional mechanical devices to enhance the restraint capability. 3. Restrained Flange Joint: This type of joint combines the features of a flanged joint and a restrained joint. It consists of a flanged pipe end that is bolted to a flange on another pipe or fitting. The bolts and nuts provide the mechanical restraint, while the flange connection ensures a secure and leak-free joint. 4. Restrained Coupling Joint: This joint is a variation of the mechanical restrained joint. It utilizes a coupling that is bolted or clamped around the pipe ends, providing the necessary restraint. The coupling may also have a gasket to ensure a tight seal. 5. Restrained Socket Joint: This joint is similar to the push-on restrained joint, but it includes additional mechanical devices to enhance the restraint capability. The socket end of the pipe is typically designed to receive a pipe spigot, which is then secured using bolts, clamps, or other mechanical devices. These different types of restrained joints for ductile iron pipe offer varying levels of restraint and are selected based on the specific requirements of the application. They ensure the integrity and stability of the pipeline system, reducing the risk of leaks, pipe separation, or movement.

Q: Are ductile iron pipes suitable for pressure sewer systems?: Yes, ductile iron pipes are suitable for pressure sewer systems. Ductile iron pipes have been widely used in various applications, including pressure sewer systems, due to their high strength and durability. These pipes are able to withstand high pressure and provide a reliable and long-lasting solution for transporting sewage under pressure. Ductile iron pipes also have excellent corrosion resistance, which is crucial in sewer systems where they are exposed to various chemicals and contaminants. They are resistant to both internal and external corrosion, ensuring that the pipes remain intact and functional over time. Furthermore, ductile iron pipes have a smooth internal surface, which helps to minimize friction and improve the flow capacity of the sewer system. This ensures that the pipes can handle the required flow rates and prevent any blockages or backups. In addition to their strength and corrosion resistance, ductile iron pipes are also known for their ease of installation. They can be easily cut and joined using a variety of methods, making them a convenient choice for pressure sewer systems. Overall, ductile iron pipes are a suitable and reliable choice for pressure sewer systems due to their high strength, corrosion resistance, smooth internal surface, and ease of installation.

Q: How much is a ductile iron pipe dn400?: Ductile iron pipe nominal diameter is 80 ~ 2200 mm, compared with grey cast iron, high strength, good toughness, thin wall metal, less dosage, and can withstand high pressure, effective length of 5 meters, 6 meters and 8 meters; according to the different thickness of P, G two. It is the development direction of cast iron pipe.

Q: How long is the service life of the cast iron pipe, and the time of use of ductile iron pipes?: Ductile iron is a new type of pipe, as long as we use it properly, the quality of its products, then the use of ductile iron pipes for 20-35 years, basically no problem. But whether it is ductile cast iron pipe, or some other things, the use of more years, and more or less, there will be some problems, ductile iron pipe can not escape the robbery. However, as long as we use the ductile iron pipe in the process of careful care, the service life of the problem is not to worry about.

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 used for irrigation of golf courses?: Certainly, ductile iron pipes are applicable for the irrigation of golf courses. Renowned for their durability, strength, and resistance to corrosion, these pipes are suitable for a wide range of uses, including irrigation systems. They possess the ability to endure high-pressure water flow and are less prone to cracking or breaking when compared to alternative materials. Moreover, ductile iron pipes boast an extended lifespan, minimizing the necessity for frequent maintenance or replacement. Consequently, they represent a dependable option for the irrigation of golf courses, where a continuous and efficient water supply is imperative for sustaining healthy turf and landscaping.

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