DUCTILE IRON PIPES K9 DN125

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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:How does ductile iron pipe compare to PVC pipe in terms of strength?: Generally, ductile iron pipe is considered stronger than PVC pipe due to its composition of iron and carbon, which provides it with high tensile strength and resistance to breakage. It is commonly utilized in heavy-duty applications like water mains, sewer lines, and industrial piping due to its ability to withstand high pressures. On the flip side, PVC pipe is manufactured using a plastic material known as polyvinyl chloride. While PVC pipe is lightweight and easy to handle, it lacks the strength of ductile iron pipe. It is typically used in low-pressure applications such as household plumbing, irrigation systems, and drainage pipes. When comparing the strength of ductile iron pipe to PVC pipe, the former has a greater capacity to handle heavy loads, endure ground movement, and resist damage from external factors like rocks or tree roots. Additionally, ductile iron pipe is more durable and has a longer lifespan in comparison to PVC pipe. However, it is important to consider that the choice between ductile iron pipe and PVC pipe ultimately depends on the specific requirements of the project. Factors such as cost, environmental conditions, ease of installation, and desired longevity should all be taken into account when determining the appropriate type of pipe to utilize.

Q:What are ductile iron pipes?: Ductile iron pipes, possessing high tensile strength and flexibility, are a variant of iron pipes. They are manufactured by treating cast iron with small quantities of magnesium, resulting in a material that surpasses traditional cast iron pipes in terms of strength and resilience. The introduction of magnesium alters the microstructure of the iron, leading to the formation of graphite nodules within the iron, hence the term "ductile iron". This distinctive structure grants ductile iron pipes exceptional properties, enabling them to withstand high pressures and extreme temperatures without cracking or breaking. Consequently, ductile iron pipes are commonly employed in water and wastewater systems, as well as various industrial applications, due to their durability, longevity, and capacity to endure external loads. Moreover, their ease of installation and minimal maintenance requirements have made them a favored choice in the construction industry.

Q:How is ductile iron pipe installed?: The installation of ductile iron pipe can be carried out using two different methods: trenchless technology or the open-cut method. When utilizing trenchless technology, a hole is drilled into the ground, and hydraulic jacks or winches are used to push or pull the ductile iron pipe into the hole. This approach minimizes disruptions to the surrounding environment and reduces the need for extensive excavation. On the other hand, the open-cut method involves excavating a trench to the necessary depth and width for the ductile iron pipe. The trench is then prepared by removing any debris or obstructions and ensuring a stable base. The pipe is subsequently lowered into the trench and aligned correctly with the assistance of laser or surveying equipment. Once the pipe is in place, joints are connected using either a rubber gasket or mechanical joint. The joints are carefully sealed to prevent any leakage. Backfill material is then meticulously placed around the pipe, ensuring proper compaction for stability and support. To avoid excessive settlement, the backfill is applied in layers. After completing the installation, the pipe undergoes testing to ensure its integrity. This may involve hydrostatic testing, where water is filled into the pipe and monitored for any signs of leakage or pressure loss. Overall, the installation of ductile iron pipe necessitates careful planning, excavation, alignment, joint connection, backfilling, and testing. It is crucial to adhere to industry standards and guidelines to achieve a successful and reliable installation that meets the required specifications.

Q:What is the expected buoyancy of ductile iron pipes?: The expected buoyancy of ductile iron pipes is minimal due to their high density and weight.

Q:What is the expected joint deflection of ductile iron pipes?: The expected joint deflection of ductile iron pipes depends on various factors such as the diameter, wall thickness, and type of joint used. However, in general, ductile iron pipes are designed to have a joint deflection capability of up to 5 degrees for restrained joints and up to 10 degrees for flexible joints.

Q:Are ductile iron pipes suitable for installation in areas with high groundwater table?: Yes, ductile iron pipes are suitable for installation in areas with a high groundwater table. Ductile iron pipes are known for their high strength and durability, making them ideal for underground installations. They can withstand the external pressure from the groundwater without deforming or collapsing. Additionally, ductile iron pipes have excellent corrosion resistance, which helps protect them from the potentially corrosive effects of groundwater. Therefore, they can be safely used in areas with a high groundwater table, providing reliable and long-lasting water supply infrastructure.

Q:How does ductile iron pipe perform in areas with high soil contamination?: Ductile iron pipe performs well in areas with high soil contamination due to its inherent strength and corrosion resistance. Its durable and robust nature allows it to withstand the chemical and physical challenges posed by contaminated soil. Additionally, its smooth interior surface minimizes the accumulation of debris and sediment, reducing the chances of blockages and maintaining efficient flow. Overall, ductile iron pipe is a reliable choice for areas with high soil contamination, providing long-lasting and dependable performance.

Q:How does ductile iron pipe perform in areas with high traffic loads?: Areas with high traffic loads greatly benefit from the exceptional performance of ductile iron pipe. Its superior strength and durability enable it to effectively handle heavy loads and withstand the impact caused by vehicular traffic. Ductile iron pipes possess a high resistance to bending and cracking, making them an ideal choice for applications in roadways, highways, and other areas with high traffic. The ability of ductile iron pipe to distribute weight and pressure exerted by heavy traffic loads is a result of its high strength. This reduces the risk of deformation or failure, making it a reliable option for transporting water, sewage, and other fluids in areas commonly frequented by heavy vehicles. Moreover, ductile iron pipe displays excellent corrosion resistance, further enhancing its performance in high traffic areas. It can withstand exposure to various environmental conditions, such as moisture, chemicals, and abrasion, without compromising its structural integrity. This durability translates into minimal maintenance requirements and a long service life, making it a cost-effective solution. In addition, the smooth internal surface of ductile iron pipe minimizes friction and allows for efficient flow of liquids. This reduces energy consumption and maximizes the hydraulic capacity of the pipe, which is particularly advantageous in areas with high traffic loads where the demand for water or wastewater transportation is often high. To summarize, ductile iron pipe is a reliable and durable choice for areas with high traffic loads. Its strength, resistance to bending and cracking, corrosion resistance, and efficient flow characteristics make it an excellent option for transportation systems in roadways, highways, and other heavily trafficked areas.

Q:Are ductile iron pipes prone to external corrosion?: External corrosion is not typically a concern for ductile iron pipes. This is because the material itself has protective properties. Ductile iron pipes are composed of a durable and strong material with a significant amount of graphite. The graphite serves as a natural barrier against external corrosion, effectively preventing rust and oxidation. Furthermore, ductile iron pipes are often coated with a layer of protection, such as cement mortar or polyethylene, to further enhance their resistance to corrosion. These coatings provide an additional safeguard, preventing contact between the pipe and any corrosive substances in the environment. It is important to note, however, that localized corrosion may still occur under certain conditions. Factors such as soil composition, moisture levels, and the presence of specific chemicals can potentially lead to the corrosion of ductile iron pipes in specific areas. Therefore, regular inspections and proper maintenance are necessary to promptly identify and address any potential corrosion concerns. In conclusion, ductile iron pipes are generally highly resistant to external corrosion. Nonetheless, like any other material, they require appropriate care and maintenance to ensure their long-term durability and reliability.

Q:Can ductile iron pipes be used for gravity sewer systems?: Yes, ductile iron pipes can be used for gravity sewer systems. Ductile iron pipes have the necessary strength, durability, and corrosion resistance to handle the flow of wastewater and withstand the external loads of a gravity sewer system. They are commonly used in underground applications where the pipes are laid in a trench and rely on gravity to transport the sewage.

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