DUCTILE IRON PIPES K8 DN1200

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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: Ways of connecting ductile iron pipes: In accordance with the wall thickness or pressure capacity, ductile iron pipe is divided into K8, K9, K10, K11, K12 four class, where the contract does not indicate, according to K9 supply.

Q: Can ductile iron pipes be used for underground fuel storage systems?: Yes, ductile iron pipes can be used for underground fuel storage systems. Ductile iron is a type of cast iron that possesses superior strength, durability, and flexibility compared to traditional cast iron pipes. These properties make ductile iron pipes suitable for various applications, including underground fuel storage systems. Ductile iron pipes are resistant to corrosion, which is essential for underground storage systems that may come into contact with various fuels and chemicals. Additionally, their high tensile strength and resilience allow them to withstand external pressure and loading, ensuring the integrity and safety of the underground storage system. Furthermore, ductile iron pipes have a long lifespan, typically lasting for several decades, making them a cost-effective choice for underground fuel storage systems. They can handle the weight of the stored fuel and any potential ground movements, maintaining the structural integrity of the system over time. However, it is important to note that the suitability of ductile iron pipes for underground fuel storage systems may also depend on other factors, such as local regulations, soil conditions, and the specific fuel being stored. It is always recommended to consult with professionals and adhere to applicable guidelines when designing and installing such systems to ensure compliance and safety.

Q: What are the lubricants for the installation of ductile iron pipes for tap water?: Lubricant used to reduce frictional resistance of friction pairs and to retard wear of lubricating medium.

Q: Can ductile iron pipes be used for oil and gas pipelines?: Yes, ductile iron pipes can be used for oil and gas pipelines. Ductile iron is a strong and durable material that is resistant to corrosion, making it suitable for transporting oil and gas over long distances. Additionally, ductile iron pipes have excellent pressure-bearing capabilities, making them capable of withstanding the high pressures often associated with oil and gas transportation. Furthermore, ductile iron pipes are relatively easy to install and maintain, which adds to their suitability for oil and gas pipelines. However, it is important to note that the specific application and conditions of the pipeline must be considered, and consulting with industry experts is recommended to ensure the proper selection and installation of ductile iron pipes for oil and gas transportation.

Q: Are ductile iron pipes suitable for use in desalination plants?: Desalination plants necessitate a dependable and long-lasting piping system to convey treated water to various destinations. Ductile iron pipes, famed for their strength, flexibility, and corrosion resistance, are truly an ideal choice for such plants. These pipes, crafted from a variant of cast iron fortified with magnesium, possess a heightened tensile strength that allows them to endure the pressures linked to the desalination process. Additionally, desalination plants often employ chemicals and other treatment methods to eliminate impurities from the water. Ductile iron pipes exhibit remarkable resistance to corrosion caused by these chemicals and can endure the harsh conditions present in desalination plants without deteriorating over time. This ensures the longevity and dependability of the piping system, consequently minimizing the chances of leaks or failures. Moreover, ductile iron pipes feature a sleek inner surface, which aids in diminishing friction and pressure loss during water flow. This aspect carries significant importance in desalination plants, where efficiency is paramount for the overall functioning of the facility. The smoothness of ductile iron pipes facilitates efficient water flow, thereby reducing energy consumption and optimizing the desalination process. In conclusion, ductile iron pipes are an appropriate choice for utilization in desalination plants due to their strength, flexibility, corrosion resistance, and smooth inner surface. These pipes provide a reliable and durable piping system capable of withstanding the elevated pressures, harsh chemicals, and demanding conditions prevalent in desalination plants.

Q: What effect does magnesium play in nodular cast iron?: The role of magnesium as spheroidizing agent used in iron spheroidizing treatment, promote water ink is made of iron, carbon in liquid iron spherical graphite precipitation.

Q: What are the different types of joints used in ductile iron pipes?: Ductile iron pipes commonly utilize various types of joints to achieve secure and leak-proof connections between pipe sections. Here are some of the frequently employed joint types: 1. Push-on joint: This joint type offers easy installation without the need for specialized tools. It entails lubricating the gasket on one pipe end and inserting it into the socket of the adjacent pipe. The gasket ensures a tight seal to prevent any leakage. 2. Mechanical joint: Consisting of a gland and a follower gasket, this joint type involves placing the gland over the spigot end of one pipe and inserting the follower gasket into the bell end of the neighboring pipe. Bolts and nuts are then used to tighten the gland, compressing the gasket and creating a secure joint. 3. Restrained joint: In applications requiring restraint against axial movement or pressure thrust, this joint type is utilized. Typically, it involves a mechanical joint combined with additional components like tie rods, thrust blocks, or restrained couplings to provide the necessary restraint. 4. Flanged joint: Large diameter ductile iron pipes often employ flanged joints. They consist of a flange on one pipe end and a mating flange on the other pipe end. The two flanges are bolted together, establishing a robust and secure connection. Flanged joints enable easy disassembly and reassembly when necessary. 5. Welded joint: Welded joints are created by fusing the ends of two pipes together using heat and pressure. This type of joint ensures a permanent and strong connection. Welded joints are commonly employed in underground or buried applications where long-term durability is a crucial factor. It is essential to consider factors such as pipe diameter, application, and project requirements when selecting the appropriate joint type. Consulting with a professional engineer or referring to the manufacturer's guidelines is recommended to ensure the suitable joint type is chosen for ductile iron pipes.

Q: Are there any special considerations for installing ductile iron pipe in rocky soils?: Yes, there are special considerations for installing ductile iron pipe in rocky soils. The presence of rocks can pose challenges during the installation process as they can cause damage to the pipe or impede its proper alignment. Therefore, it is important to carefully assess the soil conditions and rock content at the installation site. Additional measures such as proper bedding and backfilling techniques, using protective coatings or linings, and employing specialized equipment may be necessary to ensure the durability and longevity of the ductile iron pipe in rocky soils.

Q: How is ductile iron pipe protected against external corrosion?: Ductile iron pipe is protected against external corrosion through a variety of methods that ensure its durability and longevity. One common method is the application of protective coatings. The pipe is typically coated with a layer of zinc or asphaltic material, which acts as a barrier between the iron pipe and the surrounding environment. This coating helps to prevent direct contact between the pipe and corrosive elements such as soil, moisture, and chemicals, thereby reducing the risk of corrosion. Additionally, ductile iron pipes are often wrapped with a layer of polyethylene or polypropylene tape. This tape provides an extra layer of protection against external corrosion by serving as a physical barrier that shields the pipe from moisture and other potentially corrosive substances. The tape is applied with care to ensure complete coverage and adherence to the pipe's surface. Furthermore, cathodic protection is commonly employed to safeguard ductile iron pipes against external corrosion. This technique involves the installation of sacrificial anodes or impressed current systems near the pipe. These anodes generate a protective electrical current that counteracts the corrosion process, effectively inhibiting the deterioration of the pipe's surface. Lastly, proper installation practices play a crucial role in preventing external corrosion. It is essential to ensure that the pipe is buried at an appropriate depth, allowing for adequate soil coverage. This helps to minimize exposure to corrosive elements and maintain the integrity of the protective coatings. Additionally, proper backfilling techniques and the use of corrosion-resistant bedding materials can further enhance the pipe's resistance to external corrosion. In conclusion, ductile iron pipe is protected against external corrosion through a combination of protective coatings, tape wrapping, cathodic protection systems, and proper installation practices. These measures work together to provide a robust defense against the corrosive forces that the pipe may encounter, ensuring its longevity and reliability in various applications.