DUCTILE IRON PIPE K8 DN250

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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 potable water distribution systems?: Yes, ductile iron pipes are suitable for potable water distribution systems. Ductile iron pipes have excellent corrosion resistance, high strength, and durability, making them a reliable choice for transporting drinking water. They are also widely used in water infrastructure due to their ability to withstand high pressures and external loads.

Q: How are ductile iron pipes restrained against axial thrust forces?: Axial thrust forces are effectively restrained in ductile iron pipes by utilizing both mechanical restraints and soil resistance. A commonly employed method involves the use of thrust blocks, which are concrete structures constructed at bends, tees, and other directional changes in the pipeline. These blocks are specifically designed to withstand axial forces and prevent any shifting or movement of the pipes caused by the pressure exerted by the flowing fluid. Furthermore, additional support and prevention of axial movement are achieved through the implementation of mechanical restraints, such as pipe restraints, thrust collars, and anchor blocks. Pipe restraints are devices installed around the pipe and connected to adjacent structures, such as walls or concrete collars, in order to prevent any sort of movement. Thrust collars, on the other hand, are utilized to absorb and distribute the thrust forces generated by the flowing fluid. These collars, typically made of ductile iron or steel, are securely fastened around the pipe to counteract axial movement. Moreover, soil resistance plays a crucial role in restraining axial thrust forces. The weight of the soil surrounding the pipe creates frictional resistance, which effectively counteracts the axial forces. In order to ensure effective soil resistance, it is vital to properly backfill the trench, compact the soil, and adequately embed the pipe in the soil. In conclusion, a comprehensive approach involving the use of mechanical restraints such as thrust blocks, pipe restraints, and thrust collars, along with the soil resistance provided by proper trench backfilling and compaction, is employed to restrain axial thrust forces in ductile iron pipes. This approach guarantees the secure placement of the pipes and their ability to withstand the axial forces exerted by the flowing fluid.

Q: Are ductile iron pipes suitable for pressure reducing valve stations?: Ductile iron pipes prove to be suitable for pressure reducing valve stations due to their strength and durability, making them an ideal choice for applications involving high pressure. Pressure reducing valve stations, which regulate and decrease the pressure of a fluid or gas in a pipeline system, can rely on ductile iron pipes to handle the exerted pressure, ensuring an efficient and reliable operation. Moreover, the excellent resistance to corrosion exhibited by ductile iron pipes is crucial in upholding the integrity of the pipeline system, thereby preventing leaks or failures. Overall, the necessary strength, durability, and corrosion resistance required for pressure reducing valve stations are provided by ductile iron pipes.

Q: How does ductile iron pipe perform in areas with high soil contamination?: Ductile iron pipe performs exceptionally well in areas with high soil contamination due to its inherent strength, durability, and corrosion resistance properties. The material used in manufacturing ductile iron pipes is highly resistant to chemical attack, making it suitable for handling various types of contaminated soils, including those with high levels of acids, alkalis, and other corrosive substances. The corrosion resistance of ductile iron pipes is primarily attributed to their protective internal and external linings, which are designed to prevent contact between the pipe material and the surrounding soil or fluids. These linings act as a barrier, preventing the penetration of corrosive elements and reducing the risk of pipe degradation or failure. Additionally, ductile iron pipes can be further protected by applying external coatings or cathodic protection systems, which enhance their resistance to soil contamination and extend their service life. In areas with high soil contamination, ductile iron pipes offer significant advantages over other materials such as steel or concrete. Their high strength allows them to withstand the external loads imposed by the contaminated soil, reducing the risk of structural failure or deformation. Moreover, the inherent flexibility of ductile iron allows it to absorb ground movements or settlement without compromising its integrity, making it a reliable choice for areas prone to soil instability or shifting. Furthermore, ductile iron pipes have a smooth internal surface, which minimizes friction and helps maintain efficient flow rates even in the presence of contaminants. This characteristic is particularly important in areas with high soil contamination, where debris or sedimentation can accumulate and hinder fluid flow. The smooth bore of ductile iron pipes reduces the risk of clogging and ensures the continuous and reliable conveyance of fluids, even in challenging soil conditions. Overall, ductile iron pipe is a highly suitable choice for areas with high soil contamination. Its excellent corrosion resistance, strength, flexibility, and smooth internal surface make it a reliable and durable solution for conveying fluids in these challenging environments.

Q: How do ductile iron pipes handle ground movement or settlement?: Ductile iron pipes are renowned for their remarkable strength and flexibility, enabling them to effectively manage ground movement or settlement. Ground movement or settlement pertains to the natural shifts or settling of the earth's surface, which can exert stress on subterranean infrastructure such as pipes. Concerning ground movement, ductile iron pipes possess the advantage of enduring and absorbing the pressure and movement caused by shifting soil. The material's ductility permits the pipes to flex and bend to a certain extent without fracturing. This flexibility aids in distributing the load and minimizing the potential for harm. Additionally, ductile iron pipes exhibit high resistance to cracking or fracturing, even under extreme circumstances. This resilience stems from the material's unique microstructure, which imparts excellent tensile strength and impact resistance. Consequently, ductile iron pipes can withstand external forces and ground settlement without compromising their integrity. To further augment their capacity to handle ground movement or settlement, ductile iron pipes are frequently installed using flexible joints. These joints allow for slight movement and accommodate any shifting or settling of the ground. Furthermore, proper bedding and backfilling techniques are employed during installation to provide added support and stability. Overall, ductile iron pipes possess a proven track record in managing ground movement or settlement. Their strength, flexibility, and resistance to cracking establish them as a dependable choice for subterranean infrastructure, ensuring the durability and efficiency of water distribution systems.

Q: What are the common methods for flow control in ductile iron pipes?: The common methods for flow control in ductile iron pipes include the use of valves, such as gate valves, butterfly valves, and check valves. These valves are designed to regulate the flow of water or other fluids in the pipe, allowing for control and adjustment of the flow rate. Additionally, flow control can also be achieved through the use of flow meters and flow regulators, which monitor and regulate the flow of fluids through the pipe system.

Q: What is the expected roughness coefficient of ductile iron pipes?: The roughness coefficient of ductile iron pipes can differ based on different factors like pipe diameter, age, and condition, resulting in variations. However, typically, the roughness coefficient for ductile iron pipes falls within the range of 0.01-0.015 mm. This value signifies the average roughness of the pipe's internal surface and plays a crucial role in hydraulic calculations for establishing the flow characteristics and pressure losses within the pipe network. It is worth mentioning that these values are approximate and subject to change depending on specific pipe conditions and applications.

Q: Are ductile iron pipes resistant to hydrogen sulfide corrosion?: Yes, ductile iron pipes are resistant to hydrogen sulfide corrosion due to their high resistance to chemical corrosion and their protective inner lining that prevents contact between the pipe material and the corrosive elements.

Q: Which direction should the spigot of the K9 ductile iron pipe be installed?: Compared with the PE pipe, from the installation time, ductile pipe PE pipe installation is simple and rapid, and after the installation of internal and external pressure bearing better tightness and corrosion resistance; from the point of view, ductile pipe sealing better after installation, but also can improve the corrosion resistance of corrosion protection through a variety of means; from the hydraulic performance, because ductile pipe specifications generally refers to the inner diameter of PE pipe diameter specifications generally refers to the same specifications, because under the condition of ductile pipe can achieve greater runoff; from the installation and maintenance cost, ductile pipe have more favorable price. The main components of ductile iron pipes are carbon, silicon, manganese, sulfur, phosphorus and magnesium. The inner wall of zinc spray, anti-corrosion materials such as cement mortar.

Q: How to properly maintain FRP pipes: The wall of the pipe is smoothReduce flow resistance, increase flow speed and reduce energy consumption. Compared with the same size steel pipe, the flow rate of the same volume can be increased by about 10%, and no fouling and long-term use can not reduce the flow rate. The protection of cables in interference and heavy corrosion environment is better.

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