DUCTILE IRON PIPES K9 DN100

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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:QT400-10 nodular cast iron requires hardness of HRC47~51. Why can't quench hardness be reached?: QT400-10 shall ensure sufficient pearlite in the casting state, at least half of the pearlite. This is done with the temperature, time, and water. But if it is big, the heart hardness will not go up.

Q:How do ductile iron pipes handle heavy traffic loads?: Ductile iron pipes possess exceptional durability and have the ability to effortlessly withstand heavy traffic loads. This is primarily attributed to their remarkable strength and flexibility. The incorporation of graphite nodules in the composition of ductile iron allows for greater flexibility compared to traditional cast iron pipes. This enhanced flexibility empowers the pipes to endure substantial traffic loads, including the weight of vehicles traversing over them. Moreover, ductile iron pipes exhibit an elevated load-bearing capacity, enabling them to bear significant weights without experiencing any deformation or structural failure. Consequently, they are well-suited for deployment in areas characterized by heavy traffic, such as highways, bridges, and industrial sites. Furthermore, ductile iron pipes showcase exceptional resistance to external forces, such as vibrations and impacts. These pipes can effectively absorb and distribute these forces across the entire pipe network, thereby averting any potential damage and preserving the overall structural integrity. In conclusion, ductile iron pipes are explicitly engineered to manage the demands imposed by heavy traffic loads. Their strength, flexibility, and load-bearing capacity render them a dependable choice for infrastructure projects where durability and longevity are of utmost importance.

Q:What is the expected joint performance of ductile iron pipes?: The expected joint performance of ductile iron pipes is generally considered to be excellent. Ductile iron pipes are known for their high durability and strength, making them suitable for various applications such as water distribution, sewer systems, and industrial pipelines. One of the key aspects of joint performance in ductile iron pipes is their ability to withstand external loads and pressure. The joints in ductile iron pipes are typically designed to provide a tight and secure connection, ensuring minimal leakage and long-term structural integrity. This is achieved through various joint types, including push-on joints, mechanical joints, and restrained joints. Push-on joints are commonly used in ductile iron pipes and allow for easy installation without the need for special tools or equipment. These joints utilize a rubber gasket that provides a watertight seal, preventing any leakage. Mechanical joints, on the other hand, involve the use of mechanical devices such as bolts and nuts to create a rigid connection between the pipes. This type of joint provides additional strength and resistance against external forces. In terms of performance, ductile iron pipes have been extensively tested and proven to meet or exceed industry standards for pressure and bending strength. They have high resistance to corrosion, which ensures a long service life, and are also less susceptible to damage from ground movements or vibrations. These properties contribute to the overall joint performance of ductile iron pipes, ensuring reliable and efficient operation in various infrastructure systems. Overall, when installed and maintained properly, ductile iron pipes exhibit excellent joint performance, providing a reliable and durable solution for various applications in the water and wastewater industry.

Q:Can ductile iron pipes be used for underground cooling water systems?: Yes, ductile iron pipes can be used for underground cooling water systems. Ductile iron pipes are known for their durability, high strength, and resistance to corrosion, making them suitable for various applications, including underground installations. In cooling water systems, where the pipes are exposed to water and potentially harsh environments, ductile iron pipes provide a reliable and long-lasting solution. Their ability to withstand high pressure and temperature fluctuations further ensures the efficient and safe operation of the cooling water system. Additionally, ductile iron pipes are often preferred for underground installations due to their ease of installation, low maintenance requirements, and cost-effectiveness.

Q:Do rigid cement cast iron pipes need cement piers?: Ductile weakness: ductile cast iron pipes connected by human factors such as the operation level of responsibility, influence, construction not convenient. The advantages of PE PE PE pipe has good corrosion resistance and its anti inorganic performance than that of the metal pipe is much stronger in the buried without corrosion, construction convenient. Small diameter PE pipe in the price performance ratio is better than that of steel and ductile iron.PE tube have disadvantages: benzene, gasoline, carbon tetrachloride and other organic solvents have certain effect on pe. If the organic solvent is infiltrated into the polyethylene, the swelling will occur, and its physical properties will be decreased. Its pressure resistance and temperature resistance are poor.

Q:Advantages and disadvantages of ductile iron pipes: Generally not used in high pressure pipe network (6MPa or more). Because the pipe is relatively bulky, the machine must be used when installing. When the water leak occurs after the test, all the pipes must be dug out, and the pipe can be hoisted to the height of the clamps. The clamps can be installed to prevent leakage.

Q:What is the expected maintenance for ductile iron pipes?: The expected maintenance for ductile iron pipes involves regular inspections and preventative measures to ensure their longevity and optimal performance. Firstly, it is important to conduct routine visual inspections to identify any signs of corrosion, leaks, or other forms of damage. Inspecting the external surface for any signs of cracks, rust, or discoloration can help detect potential issues early on. Furthermore, periodic cleaning of the pipes is necessary to remove any debris or sediment buildup that may obstruct the flow of water. This can be achieved through flushing the pipes or using mechanical cleaning methods. Additionally, it is crucial to regularly check and maintain the protective coatings on the pipes, such as linings or external paints, to prevent corrosion and maintain their structural integrity. In terms of preventative maintenance, implementing a comprehensive corrosion control program can significantly extend the lifespan of ductile iron pipes. This can involve the application of corrosion inhibitors, cathodic protection systems, and periodic re-coating of the pipes. Regular monitoring of water chemistry parameters, such as pH levels and chlorine content, can also help prevent corrosion and extend the life of the pipes. Lastly, it is essential to keep accurate records of maintenance activities, including inspections, cleaning, and repairs, to track the condition of the pipes over time. This enables proactive planning for future maintenance and replacement needs, ultimately ensuring the efficient and reliable functioning of ductile iron pipes.

Q:Can ductile iron pipes be used in areas with high soil salinity?: Yes, ductile iron pipes can be used in areas with high soil salinity. Ductile iron pipes have excellent corrosion resistance and are often used for underground applications, including in areas with high soil salinity. The pipes are specially coated to prevent corrosion and are known for their durability and long service life, making them suitable for such environments.

Q:What is the expected joint deflection of ductile iron pipes?: Various factors, such as the pipe diameter, joint type, and installation conditions, influence the expected joint deflection of ductile iron pipes. Generally, ductile iron pipes are designed to allow for some deflection at the joints to accommodate flexibility and movement. The American Water Works Association (AWWA) offers guidelines for the maximum allowable joint deflection of ductile iron pipes. According to AWWA C151/A21.51, the joint deflection should typically not exceed 3 degrees or 1% of the nominal pipe diameter, whichever is greater. It is crucial to ensure that the joint deflection remains within the specified limits to maintain the structural integrity and performance of the pipeline system. Excessive joint deflection can result in leaks, failures, and reduced pipe lifespan. To accurately determine the expected joint deflection for a specific installation, it is recommended to refer to the manufacturer's specifications and guidelines. These specifications may vary based on pipe size, joint type, and other factors. Seeking guidance from a qualified engineer or directly contacting the manufacturer can provide precise information tailored to the project requirements.

Q:How are ductile iron pipes tested for quality?: Various methods are employed to test the quality of ductile iron pipes, ensuring they meet required standards and specifications. One commonly used test is the hydrostatic pressure test, wherein the pipes are subjected to high-pressure water or other liquids to detect leaks or weaknesses. Water is typically used to fill the pipes, with the pressure gradually increased to a predetermined level. This test effectively identifies potential defects that could compromise the pipes' integrity. Another important quality test for ductile iron pipes is the tensile test. This involves pulling a sample of the pipe until it breaks, measuring the applied force and elongation. By doing so, the pipe's tensile strength and ductility can be determined, ensuring it can withstand required loads and stresses without deformation or failure. In addition to these tests, other quality checks include visual inspection, dimensional checks, and surface defect examinations. Visual inspection involves scrutinizing the pipes for visible defects like cracks, voids, or surface irregularities. Dimensional checks ensure the pipes meet specified dimensions and tolerances. Furthermore, ductile iron pipes often undergo corrosion resistance tests. This entails exposing the pipes to corrosive environments such as saltwater or acidic solutions to evaluate their resistance to corrosion. This is vital in determining the pipes' durability and longevity, particularly in harsh conditions. Overall, ductile iron pipes undergo rigorous testing to ensure their quality and performance. These tests guarantee that the pipes meet required standards, are safe for use, and can withstand anticipated loads and environmental conditions in their intended applications.

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