DUCTILE IRON PIPES K8 DN200

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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) 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 do ductile iron pipes handle ground movement due to tree roots?: Ductile iron pipes have excellent resistance to ground movement caused by tree roots. The material's high strength and flexibility allow it to withstand root penetration and continue to function effectively. Additionally, the joints in ductile iron pipes are designed to accommodate some degree of movement, further minimizing the impact of tree roots on the pipe's integrity.

Q:The plug connection DN800 ductile iron pipe has been installed. "Shall I think so?": The main components of ductile iron pipes are carbon, silicon, manganese, sulfur, phosphorus and magnesium. Perform standard [span]GB/T13295-2003 ISO2531/2003

Q:What new technologies are there for the installation of ductile iron pipes?: Because the new flexible interface mechanism of cast iron drainage pipe pipe in the development of China's relatively short history, compared with other drainage pipes, people know little of the present, with some experience of the author in the construction, the application of the performance, characteristics and engineering, to do some simple introduction.

Q:What are the different pressure classes available for ductile iron pipe?: The different pressure classes available for ductile iron pipe include Class 100, Class 150, Class 200, Class 250, Class 300, Class 350, and Class 400.

Q:Are ductile iron pipes suitable for underground parking structures?: Yes, ductile iron pipes are suitable for underground parking structures. They are strong, durable, and resistant to external pressures, making them ideal for use in underground environments where they can withstand heavy loads and potential ground movements. Additionally, ductile iron pipes have excellent corrosion resistance, ensuring long-term performance and minimal maintenance in underground parking structures.

Q:Can ductile iron pipes be used for gravity flow applications?: Ductile iron pipes are suitable and widely used for gravity flow applications. Renowned for their strength, durability, and flexibility, these pipes are perfect for a variety of uses, such as gravity flow systems. They are commonly employed in water and wastewater systems, storm drainage systems, and other applications that necessitate resistance to high internal and external pressures. The pipes possess the capability to bear the weight of the flowing fluid without any supplemental support, which makes them a dependable choice for gravity flow applications. Furthermore, their ability to resist corrosion ensures long-term performance in both underground and exposed environments. In conclusion, ductile iron pipes are an excellent option for gravity flow applications.

Q:What kind of joints are used with ductile iron pipe?: Mechanical joints or push-on joints are commonly utilized with ductile iron pipe. Mechanical joints involve a gland and a rubber gasket for connecting pipes. These joints are fastened using bolts or other mechanical methods to ensure a secure and tight connection. On the contrary, push-on joints do not demand bolts or extra hardware. They only require the insertion of a rubber gasket into the socket of the pipe, resulting in a sealed connection. Both types of joints are extensively employed with ductile iron pipe, providing dependable and leak-proof connections for diverse applications.

Q:What is the expected cyclic fatigue life of ductile iron pipes?: The expected cyclic fatigue life of ductile iron pipes can vary depending on several factors such as material composition, pipe design, loading conditions, and environmental factors. However, ductile iron pipes are generally known for their excellent fatigue resistance. Ductile iron pipes are designed to withstand cyclic loading, which is commonly experienced in water distribution and sewer systems due to fluctuating pressures and vibrations. These pipes have a unique microstructure that provides high strength and ductility, allowing them to resist the formation and growth of cracks under cyclic loading. Several studies and industry standards have provided estimates for the expected cyclic fatigue life of ductile iron pipes. The American Water Works Association (AWWA) C151 standard, for example, recommends a design life of 100 years for ductile iron pipes used in water distribution systems, indicating their long-term durability and fatigue resistance. Furthermore, research studies have shown that ductile iron pipes can withstand over 1 million cycles of loading without any signs of fatigue failure. The fatigue strength of ductile iron pipes can be further enhanced by using protective coatings or linings to minimize the effects of corrosion and abrasion. However, it is important to note that the expected cyclic fatigue life of ductile iron pipes can be influenced by various factors such as the quality of manufacturing, installation practices, and maintenance procedures. Regular inspections, proper handling, and adherence to recommended installation guidelines can help ensure the longevity and performance of ductile iron pipes. In summary, while the expected cyclic fatigue life of ductile iron pipes can vary depending on several factors, these pipes are generally known for their excellent fatigue resistance and can provide a long-term and reliable solution for water distribution and sewer systems.

Q:Are there any limitations to the length of ductile iron pipe sections?: Yes, there are limitations to the length of ductile iron pipe sections. The maximum length of ductile iron pipe sections is typically dictated by factors such as transportation limitations, installation requirements, and structural considerations. Additionally, longer pipe sections may be more prone to bending or sagging under their own weight, which can impact the performance and integrity of the pipeline system. Therefore, it is important to adhere to industry standards and guidelines when determining the length of ductile iron pipe sections for a specific application.

Q:What are the different methods for repairing ductile iron pipe?: There are several methods available for repairing ductile iron pipes, depending on the extent and location of the damage. One common method is the use of repair clamps or couplings. These are designed to provide a temporary or permanent solution for leaks or cracks in the pipe. Repair clamps are typically made of stainless steel and are fitted around the damaged area, sealing it off and preventing further leakage. Another method is the use of epoxy lining or patching. This involves applying a specialized epoxy material to the inside of the pipe, which forms a protective barrier over the damaged area. This method is often used for smaller cracks or leaks and can provide a long-lasting solution. For more extensive damage, such as large cracks or fractures, the damaged section of the pipe may need to be cut out and replaced. This process typically involves excavating the area around the damaged pipe, removing the damaged section, and installing a new piece of ductile iron pipe. In some cases, trenchless repair methods may be used. This involves using advanced techniques such as pipe bursting or cured-in-place pipe lining to repair the pipe without the need for extensive excavation. These methods can be more cost-effective and less disruptive compared to traditional repair methods. It is important to note that the specific method chosen for repairing ductile iron pipes will depend on factors such as the extent of the damage, the location of the pipe, and the available resources and expertise. Consulting with a professional pipe repair service is recommended to determine the most suitable method for a specific repair situation.

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