• DUCTILE IRON PIPES C Class DN550 System 1
  • DUCTILE IRON PIPES C Class DN550 System 2
  • DUCTILE IRON PIPES C Class DN550 System 3
DUCTILE IRON PIPES C Class DN550

DUCTILE IRON PIPES C Class DN550

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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 for railway bridges?
Yes, ductile iron pipes can be used for railway bridges. Ductile iron is a type of strong and durable cast iron that has excellent tensile strength and flexibility. These properties make it suitable for various applications, including railway bridges. Ductile iron pipes can be used to construct railway bridge components such as supports, beams, and columns. They provide structural stability and can withstand heavy loads and vibrations associated with railway traffic. Additionally, ductile iron pipes are resistant to corrosion, which is crucial for railway bridges exposed to outdoor conditions. Therefore, ductile iron pipes are a viable option for railway bridge construction.
Q:What are the disadvantages of using ductile iron pipes?
Using ductile iron pipes in various applications comes with several drawbacks. Firstly, these pipes tend to be more expensive compared to other types like PVC or HDPE, which can be problematic for projects with budget constraints. Secondly, their relatively heavy weight makes transportation and installation more labor-intensive and time-consuming. This increases overall project costs, especially when specialized equipment and skilled workers are required. Another disadvantage is their susceptibility to corrosion. Exposure to environmental factors, like soil conditions and water chemistry, can lead to rust and scale formation on the inner and outer surfaces of the pipe. This reduces the pipe's lifespan and potentially affects water quality. Furthermore, ductile iron pipes can crack or break under certain conditions, especially when subjected to heavy loads or significant ground movement. This necessitates costly repairs or replacements, causing additional expenses and disruptions to the water supply. Lastly, ductile iron pipes have relatively low resistance to impact and abrasion compared to other materials. This makes them more vulnerable to damage from external forces, such as construction activities or accidental impacts, resulting in increased maintenance and repair costs. In conclusion, while ductile iron pipes have advantages like high tensile strength and durability, it is crucial to consider these disadvantages before deciding to use them in a specific project.
Q:Are ductile iron pipes suitable for use in paper mills?
Ductile iron pipes, known for their strength and durability, are well-suited for paper mills. With their excellent performance in various industrial settings, including paper mills, these pipes are able to withstand high-pressure systems and resist corrosion. This makes them suitable for transporting water, chemicals, and other fluids commonly used in paper mills. Moreover, the impact resistance of ductile iron pipes is advantageous in an environment with heavy machinery and equipment. In summary, ductile iron pipes are a dependable and enduring choice for paper mills, thanks to their strength, durability, corrosion resistance, and ability to handle high-pressure systems.
Q:What are the interface forms of ductile iron pipes? The best drawings are available. Thank you
Because of this interface and the corresponding T sealing aprons can withstand greater deflection angle and greater tolerances, especially suitable for unstable formations and corners.
Q:Can ductile iron pipes be used for underground slurry pipelines?
Underground slurry pipelines can utilize ductile iron pipes, as they possess strength, durability, and resistance to corrosion, making them suitable for various applications. Their qualities make them reliable and cost-effective in transporting mixtures of solids and liquids over long distances. Ductile iron pipes can endure the abrasive nature of slurry and the external loads associated with underground installation, owing to their inherent toughness and flexibility. Moreover, they can be easily connected through different methods, ensuring a secure and leak-free pipeline system. Nonetheless, it is crucial to assess the specific properties of the slurry being transported and seek professional advice to determine the suitable pipe specifications and design considerations for the underground slurry pipeline.
Q:How to analyze and judge the quality of ductile iron pipe
On the quality of single pipe can analyze it from the surface is sand type and water cooled pipes, K8 pipe is different from Shanxi root nature is that the proportion of grade K9 cement and cast iron pipe and the K8 pipe are different, there is no national standard and non standard, no K8 tube, only is the production plant in order to obtain more profits, the dealer is not up to the national standard K9 grade pipe called K8 grade ductile pipe, K9 pipe cement weighs about 1/5 weight of the pipe, but is played in the role of anti-corrosion, the so-called K8 class water mud proportion some manufacturers terrifying 3/4 or 3/5, as the water supply pipe 3/5 or no personally think that two of the proportion of the tube is no problem
Q:What is the maximum allowable joint deflection for ductile iron pipes?
Industry standards and guidelines typically specify the maximum allowable joint deflection for ductile iron pipes. These standards can vary depending on the specific application and local regulations. Typically, the maximum allowable joint deflection for ductile iron pipes is limited to a range of 1% to 5% of the pipe diameter. This means that the pipe can tolerate a deflection of up to 1% to 5% of its diameter without causing significant damage or compromising its structural integrity. However, it is important to consider factors such as pipe size, wall thickness, and operating conditions as these can affect the exact maximum allowable joint deflection. For specific guidelines on the maximum allowable joint deflection for ductile iron pipes in a given application, it is recommended to consult relevant industry standards like those published by the American Water Works Association (AWWA) or the International Organization for Standardization (ISO).
Q:How does ductile iron pipe perform in areas with high traffic loads?
Ductile iron pipe performs exceptionally well in areas with high traffic loads. Due to its superior strength and durability, it is highly capable of handling heavy loads and withstanding the impact caused by vehicular traffic. Ductile iron pipes have a high resistance to bending and cracking, making them ideal for applications in roadways, highways, and other high traffic areas. The high strength of ductile iron pipe allows it to distribute the weight and pressure exerted by heavy traffic loads more effectively, reducing the risk of deformation or failure. This makes it a reliable choice for transporting water, sewage, and other fluids in areas where heavy vehicles are commonly present. Additionally, ductile iron pipe has excellent corrosion resistance, which further enhances its performance in high traffic areas. It can withstand exposure to various environmental conditions, including moisture, chemicals, and abrasion, without compromising its structural integrity. This makes it a long-lasting and cost-effective solution, as it requires minimal maintenance and has a long service life. Furthermore, ductile iron pipe's smooth internal surface minimizes friction and allows for efficient flow of liquids, reducing energy consumption and maximizing the pipe's hydraulic capacity. This is particularly beneficial in areas with high traffic loads, where the demand for water or wastewater transportation is often greater. In summary, 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:How do ductile iron pipes perform in high-temperature steam applications?
Ductile iron pipes are known for their exceptional performance in high-temperature steam applications. They have the ability to withstand elevated temperatures and maintain their structural integrity, making them highly suitable for use in steam distribution systems. One key advantage of ductile iron pipes in high-temperature steam applications is their excellent thermal conductivity. This property allows for efficient heat transfer, ensuring that the steam is delivered at the desired temperature without significant loss. The high thermal conductivity of ductile iron also helps to minimize the risk of thermal expansion and contraction, which can lead to pipe failure or leakage. Furthermore, ductile iron pipes have a high melting point, typically around 2000°F (1093°C), which makes them resistant to the extreme temperatures encountered in steam applications. This ability to withstand high temperatures without deformation or structural failure ensures the reliability and longevity of the piping system. Another important factor contributing to the performance of ductile iron pipes in high-temperature steam applications is their corrosion resistance. These pipes are typically coated with epoxy or other protective materials to prevent corrosion and maintain their structural integrity even in aggressive steam environments. This corrosion resistance helps to ensure that the pipes can withstand the harsh conditions and operate efficiently over an extended period. In summary, ductile iron pipes are well-suited for high-temperature steam applications due to their excellent thermal conductivity, high melting point, and corrosion resistance. These properties make them a reliable and durable choice for steam distribution systems, ensuring the safe and efficient transport of steam at elevated temperatures.
Q:What are the different joint restraint systems available for ductile iron pipe?
Ductile iron pipe offers several options for joint restraint systems. These systems aim to prevent movement and separation at the pipe joints, ensuring a secure and leak-free connection. The commonly used joint restraint systems for ductile iron pipe include the following: 1. Mechanical Joint Restraint: This system involves a joint adapter and a restraining gland. 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: This system uses a push-on joint along with a restraining gland that is bolted to the pipe or structure. The gland grips the pipe, providing axial restraint and preventing movement. 3. Flex-Ring Joint Restraint: This system employs a flexible rubber ring installed inside the pipe's bell. The ring expands against the pipe, ensuring a tight and secure connection by providing radial restraint. 4. Harness Joint Restraint: This system includes a harness wrapped around the pipe and connected to a restraining gland. The harness offers both axial and radial restraint, keeping the pipe in place. 5. Grip-Lock Joint Restraint: This system involves a wedge-shaped restraint 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 combines mechanical and flexible joint restraints. It typically includes a mechanical joint adapter, a flexible joint restraint, and a restraining gland, offering both axial and radial restraint. Engineers typically specify these joint restraint systems based on factors like 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.

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