DUCTILE IRON PIPE K8 DN700

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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 prone to leakage?: Ductile iron pipes are generally considered to be resistant to leakage. This type of pipe is known for its durability and strength, making it less prone to leaks compared to other materials like PVC or even cast iron pipes. Ductile iron pipes are designed to withstand high pressure and can withstand heavy loads, making them ideal for various applications such as water supply, sewage systems, and industrial pipelines. The unique properties of ductile iron, including its flexibility and ability to absorb vibrations and shocks, contribute to its resistance against leaks. Ductile iron pipes have a high tensile strength, which means they can handle the internal and external pressures exerted on them without cracking or breaking. Furthermore, ductile iron pipes have joints that are designed to be leak-proof. These joints are typically sealed with rubber gaskets and connected using various methods such as push-on joints or restrained joints with mechanical couplings. These joint designs ensure a secure and watertight connection, reducing the risk of leaks. However, like any other type of pipe, ductile iron pipes can still experience leaks under certain circumstances. Factors such as age, corrosion, poor installation, or ground movement can contribute to the development of leaks over time. Regular maintenance and inspections are important to identify and address any potential issues that may lead to leaks. Overall, while ductile iron pipes are generally resistant to leakage and known for their reliability, it is essential to ensure proper installation, regular maintenance, and timely repairs to maximize their longevity and prevent any potential leaks.

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: Can ductile iron pipes be used in areas with high soil salinity?: Indeed, areas with high soil salinity can accommodate the use of ductile iron pipes. These pipes possess notable resistance to corrosion, rendering them compatible with different soil conditions, even those with elevated salinity levels. Usually, these pipes are coated with a safeguarding layer, such as polyethylene or zinc, which bolsters their capacity to ward off corrosion caused by saltwater or saline soils. Furthermore, employing appropriate installation methods, such as meticulous backfilling and soil compaction around the pipes, can effectively mitigate the potential consequences of high soil salinity on the durability and effectiveness of ductile iron pipes.

Q: How does ductile iron pipe perform in areas with high soil erosion?: Ductile iron pipe performs well in areas with high soil erosion due to its inherent strength and durability. Its thick walls and strong composition make it resistant to external pressures, including the erosive forces of soil. The pipe's ability to withstand the effects of soil erosion helps ensure its long-term performance and reliability in such challenging environments.

Q: Do ductile iron pipes require internal linings for potable water?: No, ductile iron pipes do not require internal linings for potable water. Ductile iron is a type of iron that has been treated to enhance its strength and flexibility. It is commonly used for water distribution systems due to its durability and resistance to corrosion. Unlike other materials, such as cast iron or steel, ductile iron pipes have a protective layer called a cement-mortar lining, which provides an effective barrier against corrosion and prevents the leaching of any harmful substances into the water. This lining is applied during the manufacturing process and is designed to withstand the corrosive properties of potable water, making internal linings unnecessary. Additionally, the smooth surface of ductile iron pipes helps to maintain the quality and flow of water without the need for additional linings.

Q: How are ductile iron pipes protected against internal corrosion caused by chemicals?: To safeguard against internal corrosion caused by chemicals, ductile iron pipes implement various protective measures. Primarily, these pipes are equipped with either a cement mortar lining or an epoxy coating, creating a barrier between the water or sewage's chemical substances and the iron material. This barrier effectively prevents direct contact, thereby averting corrosion. Additionally, a corrosion-resistant polymer or bituminous coating is frequently applied to the pipes' exterior. This supplementary layer of protection shields the pipes from potential chemical exposure originating externally. Moreover, cathodic protection is a commonly employed technique to counter internal corrosion. Sacrificial anodes, typically composed of zinc or magnesium, are affixed to the pipes. Over time, these anodes undergo corrosion instead of the iron, sacrificing themselves to safeguard the pipes against chemical-induced corrosion. Furthermore, regular maintenance and monitoring play a crucial role in the prevention and rectification of corrosion issues. This entails routine inspections, cleaning, and prompt repair of any corroded or damaged areas. Overall, the integration of lining, external coating, cathodic protection, and maintenance practices ensures the comprehensive protection of ductile iron pipes against internal corrosion caused by chemicals. This prolongs their lifespan and guarantees the integrity of the pipeline system.

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 highly resistant to corrosion, making it suitable for handling various industrial waste streams and chemicals commonly found in effluents. Its durability and strength make it an ideal choice for such environments, ensuring long-term reliability and performance.

Q: Can ductile iron pipes be repaired if damaged?: Yes, ductile iron pipes can be repaired if they are damaged. The repair process involves several steps. Firstly, the damaged section of the pipe needs to be identified and isolated. Once that is done, the damaged portion of the pipe is typically cut out and removed. A new section of pipe is then inserted and connected to the existing pipeline using appropriate methods such as welding or mechanical jointing. The repaired section is then tested to ensure its integrity and functionality. It is worth noting that the repair process may vary depending on the extent and nature of the damage, and it is always recommended to consult with professionals who specialize in ductile iron pipe repairs to ensure proper and effective restoration.

Q: If the ductile iron pipe is broken, can we use rush repair?: PE pipe repair section, as the name suggests, is a kind of used to repair the pipeline accessories. At present, the specifications of the repair section are: Phi 90, Phi 110, Phi 125, Phi 160, Phi 200, Phi 225, Phi 250, Phi 315 these specifications.

Q: What is the weight of a typical ductile iron pipe?: The weight of a typical ductile iron pipe can vary depending on size and wall thickness. Ductile iron pipes are generally available in sizes ranging from 3 inches to 64 inches in diameter. The weight of these pipes can range from a few pounds per foot for smaller sizes to several hundred pounds per foot for larger diameters. Additionally, wall thickness plays a significant role in determining the weight of the pipe. Thicker walls will result in a heavier pipe. For example, a 10-inch ductile iron pipe with a wall thickness of 0.25 inches may weigh around 26 pounds per foot, while a 24-inch ductile iron pipe with a wall thickness of 0.5 inches can weigh approximately 175 pounds per foot. To determine the precise weight of a specific ductile iron pipe, it is essential to consult specific manufacturer specifications or engineering references.

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