DUCTILE IRON PIPE K8 DN300

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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:What is the expected joint tightness for ductile iron pipes?: The expected joint tightness for ductile iron pipes is typically high due to the robustness of the material and the quality of the jointing methods used, such as rubber gaskets or mechanical couplings. This ensures a reliable and leak-free performance in various applications.

Q:How do ductile iron pipes handle thermal cycling in industrial applications?: Ductile iron pipes are well-suited for handling thermal cycling in industrial applications. Due to their high thermal conductivity and low thermal expansion coefficient, they can effectively and safely withstand the stresses caused by repeated heating and cooling cycles. This makes them highly resistant to cracking, distortion, or other forms of thermal damage, ensuring their durability and reliability in industrial environments.

Q:What are the different types of coatings available for ductile iron pipe?: There are several different types of coatings available for ductile iron pipe, each with unique properties and advantages. 1. Cement Mortar Coating: This is a commonly used coating for ductile iron pipe. It involves applying a layer of cement mortar to the interior and exterior surfaces of the pipe. This coating provides protection against corrosion and abrasion, as well as improving the hydraulic efficiency of the pipe. 2. Polyethylene Encasement: Another popular coating for ductile iron pipe is polyethylene encasement. This involves wrapping the pipe with a layer of polyethylene material. This coating provides excellent corrosion resistance and is particularly effective in protecting against soil and water contaminants. 3. Fusion-Bonded Epoxy (FBE) Coating: FBE coating involves applying a layer of epoxy powder to the pipe surface, which is then heated to create a strong bond. This coating provides excellent corrosion resistance and is commonly used in aggressive environments such as wastewater treatment plants and chemical processing facilities. 4. Zinc Coating: Zinc coating, also known as galvanization, involves applying a layer of zinc to the surface of the ductile iron pipe. This coating provides excellent corrosion resistance and is often used in outdoor applications where the pipe is exposed to moisture and humidity. 5. Bituminous Coating: Bituminous coating is a black, tar-like substance that is applied to the surface of the pipe. It provides protection against corrosion and is commonly used in underground applications where the pipe is in contact with soil or water. 6. Polyurethane Coating: Polyurethane coatings provide excellent resistance to abrasion, impact, and chemical corrosion. They are often used in aggressive environments such as oil and gas pipelines. These are just a few examples of the different types of coatings available for ductile iron pipe. The choice of coating depends on factors such as the intended application, environmental conditions, and the level of corrosion protection required. It is important to consult with industry experts and adhere to relevant standards and specifications when selecting a coating for ductile iron pipe.

Q:Does centrifugal cast iron pipe work well with lining cement? Will it scale and breed bacteria?: The situation in use abroad seems. It is considered that the corrosion of the inner wall of the centrifugal centrifugal ductile iron pipe and the rupture of the pipe are easy to occur when the content of chloride ion exceeds 5O0PPm in the pipe laying environment. This is mainly because, because the cement paste protection layer is the late spraying construction, it is not good to combine with the prefabricated core tube. It often causes water or moisture to seep in and causes oxidation and corrosion of the prestressing steel bars, resulting in fracture. The adhesive interface between cement mortar and centrifugally cast iron pipe is not reasonable. Because of the water absorption of cement, when the water enters the pipe, it is easy to destroy the interface and corroded the inner wall of the centrifugally cast iron pipe. Because it is a brittle material, it is easy to cause sudden accidents.

Q:How do ductile iron pipes handle water hammer?: Ductile iron pipes are well-suited to handle water hammer due to their inherent strength and flexibility. The high tensile strength of ductile iron helps absorb and dampen the pressure surges caused by water hammer, preventing any significant damage to the pipes. Additionally, the inherent ductility of these pipes allows them to flex and absorb the impact of water hammer, reducing the likelihood of cracks or bursts. Overall, ductile iron pipes provide a reliable and durable solution for managing water hammer in water distribution systems.

Q:Can ductile iron pipes be used in high-temperature applications?: Ductile iron pipes are capable of being utilized in applications that involve high temperatures. Unlike PVC or HDPE pipes, ductile iron pipes possess a higher melting point, rendering them suitable for transporting fluids at elevated temperatures. The material properties of ductile iron, encompassing its strength, toughness, and ability to withstand thermal stress, allow it to endure higher temperatures without distorting or failing. Nevertheless, it is worth noting that the precise temperature threshold for ductile iron pipes may vary depending on factors such as the grade of ductile iron employed, the pressure of the fluid being conveyed, and the duration of exposure to elevated temperatures. Consequently, it is imperative to consult the manufacturer's specifications and guidelines in order to ensure the appropriate selection and installation of ductile iron pipes for high-temperature applications.

Q:How are ductile iron pipes made?: Ductile iron pipes are made through a process called centrifugal casting. In this method, molten iron is poured into a rapidly spinning mold, which forces the iron to evenly distribute along the walls of the mold. As the mold continues to spin, the iron cools and solidifies, forming a hollow cylindrical shape. This process allows the iron to retain its strength and flexibility, making it suitable for use in various piping applications.

Q:How are ductile iron pipes restrained against axial thrust forces?: Ductile iron pipes are typically restrained against axial thrust forces through the use of various mechanical joint systems. These joints, such as the push-on joint or the restrained joint, provide a secure connection between the pipes, preventing movement and ensuring structural integrity. Additionally, methods like concrete thrust blocks or anchor blocks are often used to further restrain the pipes and counteract any axial thrust forces that may be exerted on them.

Q:What are the different sizes available for ductile iron pipes?: Ductile iron pipes, also called DI pipes, come in a wide array of sizes to accommodate different needs and applications. The diameter of ductile iron pipes usually ranges from DN 80 (3 inches) to DN 2600 (104 inches), with varying wall thicknesses. For smaller diameters like DN 80 to DN 300, standard lengths of 5.5 meters or 6 meters are readily available for ductile iron pipes. As the diameter increases, the standard lengths may also increase, going up to 7 meters or even longer for larger sizes. Commonly used ductile iron pipe sizes include DN 80, DN 100, DN 150, DN 200, DN 250, DN 300, DN 350, DN 400, DN 450, DN 500, DN 600, DN 700, DN 800, DN 900, DN 1000, DN 1200, DN 1400, DN 1600, DN 1800, DN 2000, DN 2200, DN 2400, DN 2600, and more. It is important to note that the availability of different sizes may vary depending on the manufacturer and the specific region or country. Moreover, custom sizes can also be produced to meet specific project requirements. When selecting the appropriate ductile iron pipe size, it is crucial to consider factors like flow rate, pressure, and intended application to ensure optimal performance and durability. Seeking advice from industry experts or referring to relevant standards and guidelines can aid in determining the suitable size for a particular project.

Q:How does ductile iron pipe handle temperature changes?: Ductile iron pipe is known for its ability to handle temperature changes effectively. The unique properties of ductile iron make it highly resistant to thermal expansion and contraction, allowing it to withstand extreme temperature variations without significant deformations or failures. When exposed to temperature changes, ductile iron pipes can expand or contract within certain limits due to its inherent ductility. This flexibility helps to accommodate thermal stresses and prevent the pipe from cracking or breaking. The material's high tensile strength and elasticity also contribute to its ability to handle temperature changes without significant structural damage. Moreover, ductile iron pipes have a low coefficient of thermal expansion, meaning they expand and contract at a relatively slow rate compared to other materials. This characteristic minimizes the potential for stress on the pipe joints and reduces the risk of leaks or failures. In addition to its excellent thermal stability, ductile iron pipe also features a protective lining that further enhances its resistance to temperature changes. The linings, such as cement mortar or polyethylene, create a barrier between the pipe and the transported fluid, preventing any adverse effects caused by thermal variations on the pipe's internal surface. Overall, ductile iron pipe is a reliable choice for applications where temperature changes are common. Its ability to withstand thermal stresses, low coefficient of thermal expansion, and protective linings make it a durable and efficient solution for various infrastructural needs, including water distribution, wastewater management, and industrial applications.

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