DUCTILE IRON PIPE K8 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: Are ductile iron pipes suitable for installation in areas with high seismic activity?: Areas with high seismic activity are well-suited for the installation of ductile iron pipes. Their ability to withstand external loads and ground movement is a key advantage, making them ideal for seismic zones. In fact, these pipes possess excellent flexibility and high tensile strength, enabling them to endure ground shifting and seismic forces without breaking or fracturing. Additionally, their high resistance to impact and stress decreases their vulnerability to damage during seismic events. Furthermore, the performance of ductile iron pipes in seismic areas has been extensively demonstrated. They have been successfully implemented and utilized in earthquake-prone regions worldwide for numerous years, showcasing their capacity to endure ground movements caused by seismic activity without jeopardizing their structural integrity. Moreover, ductile iron pipes offer the added benefit of being highly durable and long-lasting, which is vital in high seismic areas where infrastructure must withstand frequent ground movements. Their extended lifespan reduces the necessity for frequent maintenance and replacement, resulting in a cost-effective option in the long term. However, it is crucial to note that proper installation techniques and adherence to seismic design guidelines are imperative to ensure optimal performance of ductile iron pipes in high seismic areas. Consulting experienced engineers and adhering to local building codes and regulations is recommended to guarantee correct installation and the ability to withstand the specific seismic conditions of the area. Overall, due to their flexibility, strength, durability, and proven performance, ductile iron pipes are regarded as a suitable choice for installation in areas with high seismic activity.

Q: Are ductile iron pipes resistant to microbiologically induced corrosion?: Yes, ductile iron pipes are generally resistant to microbiologically induced corrosion (MIC). Ductile iron is a type of cast iron that has been treated with magnesium to give it increased strength and flexibility. This treatment creates a protective layer on the surface of the iron, making it less susceptible to corrosion caused by microorganisms. MIC occurs when certain types of bacteria, fungi, or other microorganisms interact with the metal surface of pipes and produce corrosive byproducts. However, ductile iron is generally resistant to MIC because the protective layer formed during the manufacturing process acts as a barrier, preventing microorganisms from directly contacting the metal surface. Additionally, ductile iron pipes are often lined with cement mortar or other protective coatings, which further enhance their resistance to corrosion. These linings provide an additional layer of protection against microorganisms, reducing the potential for MIC. Despite these inherent resistance properties, it is important to note that the resistance to MIC can vary depending on the specific conditions and environment in which the pipes are installed. Factors such as water quality, temperature, and the presence of certain microorganisms can influence the susceptibility of ductile iron pipes to MIC. Therefore, it is essential to consider these factors and take appropriate measures to prevent MIC, such as regular monitoring of water quality, proper maintenance, and the use of corrosion inhibitors or biocides when necessary.

Q: What are the different methods for tapping ductile iron pipe?: There are several different methods for tapping ductile iron pipe, depending on the specific requirements of the project. Some of the common methods used include: 1. Mechanical Tapping: This method involves using a mechanical tapping machine to create a hole in the ductile iron pipe. The machine is equipped with a cutting tool that rotates and cuts through the pipe wall, creating a clean hole. This method is commonly used for smaller diameter pipes and is relatively quick and efficient. 2. Hot Tapping: Hot tapping involves creating a hole in a pressurized ductile iron pipe while it is still in service. This method requires specialized equipment and expertise to ensure safety and maintain the integrity of the pipe. Hot tapping is commonly used when it is not feasible or practical to shut down the pipeline for maintenance or repair work. 3. Electrofusion Tapping: Electrofusion tapping is a method that uses an electrofusion saddle and fitting to create a branch connection on a ductile iron pipe. This method involves welding a fitting onto the pipe using an electrofusion machine, which creates a secure and leak-proof connection. Electrofusion tapping is commonly used for larger diameter pipes and is suitable for both water and gas applications. 4. Saddle Tapping: Saddle tapping involves attaching a saddle or clamp onto the ductile iron pipe and drilling a hole through the saddle into the pipe. The saddle is then equipped with a threaded outlet for connecting a branch line. This method is commonly used for smaller diameter pipes and is relatively simple and cost-effective. 5. Split Sleeve Tapping: Split sleeve tapping is a method that involves cutting a section out of the ductile iron pipe and installing a split sleeve over the cut. The split sleeve is then bolted together, creating a secure and watertight connection. This method is commonly used for larger diameter pipes and is suitable for both water and gas applications. It is important to note that the selection of the tapping method should be based on factors such as the pipe size, pressure rating, required branch connection, and the specific requirements of the project. Consulting with a professional engineer or tapping specialist is recommended to ensure the proper method is used for tapping ductile iron pipe.

Q: What is the disadvantage of nodular cast iron in excess of silicon?: Therefore, the increase of silicon content in nodular iron greatly improves the strength index and reduces toughness. Ductile iron has a greater crystalline undercooling and a tendency to chill when treated by spheroidizing, and silicon reduces this tendency.

Q: How are ductile iron pipes protected against root intrusion?: Ductile iron pipes are protected against root intrusion through the use of protective coatings and barriers. One common method is to apply an external coating, such as a bituminous or epoxy layer, which acts as a deterrent for root penetration. Additionally, root barriers made of high-density polyethylene or other materials can be installed around the pipes to further prevent root intrusion. These measures help to maintain the structural integrity of the pipes and prevent any potential damage caused by root growth.

Q: How is ductile iron pipe protected against external corrosion?: To ensure the durability and longevity of ductile iron pipe, various methods are employed to protect it from external corrosion. One commonly used method is the application of protective coatings. Typically, a layer of zinc or asphaltic material is applied to the pipe, creating a barrier between the iron and the surrounding environment. This coating prevents direct contact between the pipe and corrosive elements like soil, moisture, and chemicals, thereby reducing the risk of corrosion. Another layer of protection is provided by wrapping the ductile iron pipe with polyethylene or polypropylene tape. This tape acts as a physical barrier, shielding the pipe from moisture and other potentially corrosive substances. Great care is taken during the application process to ensure complete coverage and adherence to the pipe's surface. Cathodic protection is also commonly used to safeguard ductile iron pipes from external corrosion. This technique involves installing 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. Proper installation practices also play a crucial role in preventing external corrosion. It is important to bury the pipe at an appropriate depth, ensuring adequate soil coverage. This minimizes exposure to corrosive elements and maintains the integrity of the protective coatings. Additionally, using corrosion-resistant bedding materials and employing proper backfilling techniques can further enhance the pipe's resistance to external corrosion. In conclusion, a combination of protective coatings, tape wrapping, cathodic protection systems, and proper installation practices ensures the protection of ductile iron pipe against external corrosion. These measures work together to provide a strong defense against corrosive forces, ensuring the pipe's reliability and longevity in various applications.

Q: What is the process of fusion bonding for ductile iron pipes?: Ductile iron pipes are joined together through the fusion bonding process, which involves applying heat and pressure to create a strong and long-lasting bond. This technique is commonly used in the construction and installation of underground water, sewer, and gas pipelines. To start the fusion bonding process, the surfaces of the pipes are thoroughly cleaned and prepared. This includes removing any dirt, debris, or rust that could hinder proper bonding. Specialized tools and techniques, such as wire brushing or sandblasting, are often utilized to ensure a clean and smooth surface. Once the surfaces are prepared, the pipes are aligned and securely clamped together. A fusion bonding machine, also known as a fusion welder, is then employed to apply heat and pressure to the joint. The fusion bonding machine consists of heating elements positioned around the joint and a hydraulic system that applies the necessary pressure. The heating elements, typically powered by electricity or gas, are designed to reach high temperatures capable of melting the ductile iron material. As the heat is applied, the ductile iron surfaces soften and fuse together, creating a strong bond. The pressure from the fusion bonding machine ensures that the molten iron flows evenly and uniformly between the joint surfaces, resulting in a seamless connection. The duration of the fusion bonding process varies depending on the size and thickness of the pipes and the specific project requirements. Once the fusion bonding is complete, the joint is allowed to cool and solidify, forming a permanent and leak-proof connection. Fusion bonding offers numerous advantages for ductile iron pipes. It provides a reliable and durable joint that can withstand high pressure, temperature variations, and external loads. The seamless connection also minimizes the risk of leaks, which is particularly important for underground pipelines that transport water, sewage, or gas. Overall, fusion bonding is a widely utilized technique for joining ductile iron pipes, ensuring their structural integrity and longevity in various infrastructure projects.

Q: Advantages and disadvantages of ductile iron pipes: Generally not used in high pressure pipe network (6MPa or more). Because the pipe is relatively bulky, the machine must be used when installing. When the water leak occurs after the test, all the pipes must be dug out, and the pipe can be hoisted to the height of the clamps. The clamps can be installed to prevent leakage.

Q: Are ductile iron pipes suitable for potable water systems?: Indeed, potable water systems can utilize ductile iron pipes without any issues. For numerous years, these pipes have been extensively employed in potable water systems due to their exceptional endurance, robustness, and resistance to corrosion. Their construction enables them to withstand high-pressure water flow and successfully tackle the challenges associated with underground installation. Additionally, the smooth internal surface of ductile iron pipes effectively prevents the accumulation of scale or sediment, guaranteeing the provision of sanitary and safe drinking water. Moreover, their extended lifespan renders them a cost-effective alternative for potable water systems. In summary, ductile iron pipes are an unquestionably dependable and widely embraced choice for potable water supply networks.

Q: Are ductile iron pipes resistant to sulfuric acid corrosion?: Generally, ductile iron pipes exhibit resistance to corrosion caused by sulfuric acid. Ductile iron, known for its strength and durability, contains a substantial amount of iron, which renders it less vulnerable to the harmful effects of sulfuric acid compared to materials like cast iron or steel. Nevertheless, it is crucial to consider that the degree of resistance can vary depending on factors such as the concentration and temperature of the sulfuric acid, as well as the duration of exposure. In scenarios where the acid is highly concentrated or the temperature is elevated, additional precautions may be required to guarantee long-term protection against sulfuric acid corrosion. These measures could include lining the pipes with suitable materials or employing corrosion inhibitors.

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