DUCTILE IRON PIPES K8 DN150

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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:Can ductile iron pipes be used for underground hydropower systems?: Indeed, underground hydropower systems can utilize ductile iron pipes. Renowned for their robustness and endurance, ductile iron pipes are apt for a wide range of purposes, including subterranean installations. With remarkable resistance against corrosion and the ability to withstand intense pressure, they are exceptionally suited for transporting water in hydropower systems. Furthermore, ductile iron pipes boast a lengthy lifespan, diminishing the necessity for frequent replacements and reducing maintenance expenses. Moreover, they exhibit excellent joint integrity, guaranteeing leak-free connections beneath the surface. Thus, ductile iron pipes emerge as a dependable option for underground hydropower systems.

Q:What is the composition of ductile iron pipes?: Ductile iron pipes consist mainly of iron, with small amounts of carbon, silicon, and other alloying elements. The iron content typically ranges from 90% to 94%, while carbon content is usually around 3% to 4%. Silicon is added between 1.5% to 3%, which enhances the ductility and strength of the iron. Smaller quantities of manganese, sulfur, and phosphorus may also be present. The composition of ductile iron pipes is carefully engineered to achieve specific properties. By adding carbon and silicon, the hardness and strength of the iron are improved, making it suitable for demanding applications. These alloying elements also contribute to the pipes' ductility, allowing them to be easily bent and molded without breaking. In summary, the composition of ductile iron pipes is designed to strike a balance between strength, ductility, and resistance to corrosion. This makes them ideal for use in water and sewage systems, where they can endure high pressure, bear heavy loads, and resist the corrosive effects of water and other chemicals.

Q:Can ductile iron pipes be used for underground wastewater outfalls?: Yes, ductile iron pipes can be used for underground wastewater outfalls. Ductile iron pipes are a popular choice for underground applications due to their durability, strength, and corrosion resistance. They are designed to withstand high pressure and external loading, making them suitable for transporting wastewater over long distances and depths. Additionally, ductile iron pipes have a smooth internal surface, which helps to minimize friction and prevent the buildup of sediments or debris that could potentially block the flow of wastewater. Therefore, ductile iron pipes are commonly used in underground wastewater systems, including outfalls, to ensure efficient and reliable wastewater transport while minimizing the risk of pipe failure or blockages.

Q:How are ductile iron pipes protected against freeze-thaw cycles?: Ductile iron pipes are protected against freeze-thaw cycles by using a combination of insulation, proper installation techniques, and the addition of corrosion inhibitors or anti-freeze agents in the water supply. This helps prevent the expansion and contraction of the pipes caused by freezing and thawing, reducing the risk of damage or cracking.

Q:What are the different sizes of ductile iron pipes available?: Ductile iron pipes come in a range of sizes to meet different needs and purposes. Typically, the diameter of these pipes varies from 3 inches to 64 inches. This variety in sizes offers versatility and adaptability in various sectors such as water supply, sewage systems, irrigation, and industrial piping. Smaller ductile iron pipes, with diameters ranging from 3 to 12 inches, are commonly used for residential and small-scale purposes like household plumbing, fire hydrant systems, and small irrigation projects. These sizes are commonly found in urban areas and residential neighborhoods. For larger-scale applications, larger ductile iron pipes are employed. These pipes can have diameters ranging from 14 to 64 inches. They are primarily used in municipal water supply systems, wastewater treatment plants, and industrial facilities where there is a need for high-volume water flow. The wide array of sizes available in ductile iron pipes ensures that they can accommodate different flow rates and pressure requirements. This allows engineers, contractors, and designers to choose the appropriate size based on the specific demands of a particular project or application. To ensure the proper selection of ductile iron pipe size for a specific project, it is essential to consult industry standards, local regulations, and engineering guidelines. This ensures that the pipes meet the required performance standards and are suitable for the intended use.

Q:How does ductile iron pipe perform in corrosive soils?: Ductile iron pipe performs exceptionally well in corrosive soils due to its unique composition and protective lining. The iron in ductile iron pipe is more resistant to corrosion than other materials, such as steel. Additionally, the interior of the pipe is often lined with cement mortar or an epoxy coating, providing an extra layer of protection against corrosive elements. This combination of materials enables ductile iron pipe to withstand the effects of corrosive soils and maintain its structural integrity over an extended period of time.

Q:What's the difference between grey cast iron pipe and ductile iron pipe?: Spheroidal graphite cast iron and ordinary cast iron contain graphite monomer, that is to say, cast iron is a mixture of iron and graphite. The graphite in ordinary cast iron is flaky, and the strength of graphite is very low, so there are many flakes of voids in the cast iron, so the strength of ordinary cast iron is lower and more brittle. Graphite in graphite cast iron is spherical, equivalent to the existence of many spherical voids in cast iron. The effect of spherical voids on the strength of cast iron is much smaller than that of sheet voids, so the strength of nodular cast iron is much higher than that of ordinary cast iron.

Q:What is the expected thrust restraint method for ductile iron pipes?: Typically, to achieve the expected thrust restraint for ductile iron pipes, mechanical joint restraints are employed. These restraints are designed to counteract the axial forces or thrust caused by the fluid pressure within the pipe. Thrust blocks, tie rods, and harness restraints are the most commonly used types of mechanical joint restraints for ductile iron pipes. Thrust blocks are concrete structures strategically placed around the pipe joints to resist the thrust forces. They are typically constructed at bends, tees, and other directional changes to prevent pipe movement. Tie rods, on the other hand, are another frequently used method of thrust restraint. These involve steel rods that are anchored to the pipe and securely fastened to an immovable structure to counter the thrust forces. Harness restraints, however, are constituted by a series of steel rods or cables that encircle the pipe and are anchored to the ground on both sides. These restraints effectively distribute the axial forces along the pipe's length, preventing movement and ensuring stability. The choice of a specific thrust restraint method for ductile iron pipes may vary depending on various factors such as pipe diameter, fluid pressure, soil conditions, and local regulations. It is vital to consult industry standards, engineering guidelines, and local authorities to determine the appropriate thrust restraint method for a particular application.

Q:What are the typical joint restraint requirements for ductile iron pipes under pressure?: The typical joint restraint requirements for ductile iron pipes under pressure include the use of mechanical joint restraining devices such as bolts, gaskets, and thrust blocks. These restraints are necessary to prevent the pipes from separating or moving due to the internal pressure of the fluid being transported. Additionally, proper alignment and anchoring of the pipes are essential to ensure the integrity and stability of the pipeline system.

Q:Can ductile iron pipes be used for water supply networks?: Yes, ductile iron pipes can be used for water supply networks. Ductile iron pipes are known for their strength and durability, making them suitable for carrying water over long distances. They are resistant to corrosion and can withstand high pressure and external loads, making them a reliable choice for water supply systems. Additionally, ductile iron pipes have a smooth internal surface, which reduces friction and allows for efficient water flow. Overall, ductile iron pipes have been widely used in water supply networks around the world due to their excellent performance and longevity.

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