DUCTILE IRON PIPE K9 DN1000

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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 in seismic zones?: Yes, ductile iron pipes can be used in seismic zones. Ductile iron pipes are known for their high strength and flexibility, which allows them to withstand ground movement and seismic activities. They have the ability to absorb and distribute the forces generated during an earthquake, reducing the risk of pipe failure or damage. Additionally, ductile iron pipes have been used successfully in seismic zones for many years, and their performance has been proven through various tests and evaluations. However, it is important to follow the appropriate design and installation guidelines to ensure the proper functioning and safety of ductile iron pipes in seismic zones.

Q:What is the difference between spheroidal graphite cast iron QT400-15 and QT400-15A? What does the A mean later?: This should be said in front of the material, and later add A, should refer to the grade

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:Can ductile iron pipe be used for industrial applications?: Yes, ductile iron pipe can be used for industrial applications. Ductile iron pipes are known for their durability, strength, and resistance to corrosion, making them suitable for various industrial settings. They can handle high-pressure and heavy-duty applications, making them ideal for industries such as water and wastewater, oil and gas, and chemical processing.

Q:How are ductile iron pipes protected against internal scaling or buildup?: Ductile iron pipes are protected against internal scaling or buildup through various methods. One of the most common methods is the application of cement mortar lining on the inner surface of the pipes. This lining acts as a protective barrier, preventing the formation of scale or buildup and ensuring a smooth flow of water or other fluids. Additionally, the pipes can be coated with a layer of polyethylene or other suitable materials to provide an extra level of protection against scaling or buildup. This coating acts as a barrier between the water and the iron surface, reducing the chances of corrosion or scale formation. Regular maintenance and cleaning are also crucial in preventing internal scaling or buildup in ductile iron pipes. Flushing the pipes with high-pressure water or using chemical treatments can help remove any accumulated scale or debris, ensuring the pipes remain clean and functional. Furthermore, proper water treatment is important to minimize the risk of scaling or buildup. Implementing appropriate water treatment processes, such as pH adjustment or the use of corrosion inhibitors, can help maintain the quality of the water and prevent the formation of scale or buildup inside the pipes. In conclusion, ductile iron pipes are protected against internal scaling or buildup through various measures, including cement mortar lining, pipe coating, regular maintenance, cleaning, and proper water treatment. These measures ensure the longevity and efficiency of the pipes, minimizing the chances of clogging or reduced flow capacity.

Q:Are ductile iron pipes suitable for potable water systems?: Yes, ductile iron pipes are suitable for potable water systems. Ductile iron pipes have been widely used in potable water systems for many years due to their durability, strength, and corrosion resistance. They are designed to withstand high-pressure water flow and can handle the challenges of underground installation. Additionally, ductile iron pipes have a smooth internal surface that prevents the buildup of scale or sediment, ensuring the delivery of clean and safe drinking water. They also have a long service life, making them a cost-effective choice for potable water systems. Overall, ductile iron pipes are a reliable and widely accepted option for potable water supply networks.

Q:What are the different joint restraint systems available for ductile iron pipe?: There are several different joint restraint systems available for ductile iron pipe. These systems are designed to prevent movement and separation of the pipe at the joints, ensuring a secure and leak-free connection. Some of the common joint restraint systems for ductile iron pipe include: 1. Mechanical Joint Restraint: This system consists of a mechanical joint adapter and a restraining gland that provides axial restraint. The joint adapter is bolted to the pipe, while the restraining gland is bolted to the adjacent pipe or structure, preventing any movement. 2. Push-on Joint Restraint: In this system, a push-on joint is used along with a restraining gland that is bolted to the pipe or structure. The gland provides axial restraint by gripping the pipe and preventing it from moving. 3. Flex-Ring Joint Restraint: This system utilizes a flexible rubber ring that is installed inside the pipe's bell. The ring provides radial restraint by expanding against the pipe, ensuring a tight and secure connection. 4. Harness Joint Restraint: This system consists of a harness that is wrapped around the pipe and connected to a restraining gland. The harness provides both axial and radial restraint, keeping the pipe in place and preventing any movement. 5. Grip-Lock Joint Restraint: This system utilizes a wedge-shaped restraint that is inserted into the pipe's bell. The wedge expands and locks into place, providing both axial and radial restraint. 6. Restrained Joint System: This system incorporates a combination of mechanical and flexible joint restraints. It typically includes a mechanical joint adapter, a flexible joint restraint, and a restraining gland, providing both axial and radial restraint. These joint restraint systems are designed to meet specific application requirements and are often specified by engineers based on factors such as pipe diameter, operating pressure, and soil conditions. Each system has its own advantages and limitations, and the selection depends on the specific project needs and constraints.

Q:What is the exterior anticorrosion of nodular cast iron pipes?: According to the national standard GB/T13295-2008, external corrosion prevention technology of ductile cast iron pipe is coated with asphalt paint, spraying zinc, widely used in domestic manufacturers is spraying zinc spraying asphalt layers corrosion, zinc layer thickness: 130 grams / square meters, the thickness of asphalt 75Um.

Q:Can the underground cast iron pipes be connected with clamps to form buttress?: The clamp hoop is a connecting device for connecting pipe fittings, valves and pipe fittings with grooves. Used in the fast joint between the role of tightening, the general two joints with gaskets, rubber, and silicone, ptfe.

Q:How are ductile iron pipes tested for quality assurance?: To guarantee the quality and adherence to industry standards of ductile iron pipes, a variety of testing procedures are carried out. These tests evaluate both the raw materials and the finished products, aiming to ensure the pipes' durability, strength, and overall reliability. The first step involves analyzing the chemical composition of the raw materials used in the manufacturing process. This analysis verifies that the iron, carbon, and other elements fall within the specified range, as different compositions can impact the pipes' strength and resistance to corrosion. Next, mechanical tests assess the pipes' strength and ductility. Tensile tests determine properties like ultimate tensile strength, yield strength, and elongation, which help assess the pipes' ability to withstand external pressure and bending forces. Moreover, impact tests measure the pipe's ability to resist sudden loading or impact. By evaluating the energy absorbed by the pipes under high impact force, these tests ensure that the pipes can endure accidental impacts during installation or operation. Another pivotal test is the hydrostatic pressure test, which examines the pipes' capacity to withstand internal pressure. By subjecting the pipes to a specific pressure for a designated duration while filled with water, this test ensures their capability to handle expected operating pressures without any leakage or failure. Furthermore, dimensional and visual inspections are conducted to verify that the pipes meet the required specifications. These inspections involve checking the outer diameter, length, wall thickness, and overall appearance for any defects, such as cracks, voids, or irregularities. Lastly, corrosion resistance tests evaluate the pipes' ability to resist corrosion when exposed to different environments or fluids. These tests help determine the pipes' expected lifespan and their suitability for various applications. In conclusion, these quality assurance tests are vital in ensuring that ductile iron pipes adhere to the necessary standards and deliver dependable, long-lasting performance in diverse infrastructure projects.

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