• DUCTILE IRON PIPE C Class DN900 System 1
  • DUCTILE IRON PIPE C Class DN900 System 2
  • DUCTILE IRON PIPE C Class DN900 System 3
DUCTILE IRON PIPE C Class DN900

DUCTILE IRON PIPE C Class DN900

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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:How do ductile iron pipes handle pressure surges in pumping stations?
Ductile iron pipes are specifically designed to handle pressure surges in pumping stations effectively. The inherent strength and flexibility of ductile iron make it well-suited to withstand the sudden increase in pressure that can occur during pump start-up or shutdown. One of the key features of ductile iron pipes is their ability to absorb and dissipate energy. When a pressure surge occurs, the ductile iron pipes have the capacity to absorb the excess pressure and distribute it evenly throughout the pipe network. This helps to minimize the impact of the surge and prevent any potential damage to the pipes or the pumping station. Additionally, ductile iron pipes have a high resistance to impact and stress, which further enhances their ability to handle pressure surges. The pipes are manufactured using a unique process that imparts strength and durability, allowing them to withstand the forces exerted during pressure fluctuations without any significant deformation or failure. Furthermore, ductile iron pipes have a smooth internal surface, which reduces friction and turbulence within the pipe network. This smooth flow characteristic helps to mitigate the effects of pressure surges by allowing the water to move efficiently without creating additional stress on the pipes. In summary, ductile iron pipes are specifically engineered to handle pressure surges in pumping stations by absorbing and dissipating the excess pressure, withstanding the impact and stress, and promoting smooth flow. Their robustness and reliability make them an ideal choice for applications where pressure fluctuations are common, ensuring the longevity and efficiency of the pumping infrastructure.
Q:How do ductile iron pipes handle seismic movements?
Ductile iron pipes are renowned for their exceptional capacity to handle seismic movements, owing to their distinctive properties and construction. This renders them remarkably resistant to stress and deformation caused by ground vibrations during earthquakes. One of the primary merits of ductile iron pipes lies in their superior tensile strength, enabling them to endure substantial forces without succumbing to breakage or rupture. When seismic movements occur, these pipes exhibit flexibility and absorb the energy generated by the ground vibrations, thereby minimizing the risk of damage or failure. Moreover, ductile iron pipes possess exemplary resilience, allowing them to revert to their original shape after being subjected to external forces. This characteristic empowers the pipes to adapt to ground movements during earthquakes, effectively diminishing the likelihood of fractures or leaks. Furthermore, ductile iron pipes boast considerable ductility, enabling them to deform without fracturing. This attribute proves crucial during seismic events, as it enables the pipes to absorb the energy generated by ground vibrations by deforming and subsequently returning to their original shape once the seismic activity subsides. In order to further enhance their capacity to handle seismic movements, ductile iron pipes are frequently designed and installed with flexible joints. These joints grant the pipes the ability to move and adjust to ground movements, offering additional safeguards against damage or failure. In conclusion, ductile iron pipes have demonstrated their extraordinary reliability and resilience in withstanding seismic movements. Their combination of high tensile strength, resilience, and ductility make them an optimal choice for regions prone to earthquakes, ensuring the safety and durability of fluid transportation systems.
Q:What are the typical maintenance requirements for ductile iron pipe?
The typical maintenance requirements for ductile iron pipe include regular inspections for signs of corrosion or damage, cleaning and flushing to remove sediment and debris, and occasional repair or replacement of sections that are worn or leaking. Additionally, applying protective coatings or linings can help prolong the lifespan of the pipe and prevent corrosion.
Q:What is the expected corrosion protection system for ductile iron pipes?
The expected corrosion protection system for ductile iron pipes typically involves a combination of external coatings, internal linings, and cathodic protection. External coatings are applied to the exterior surface of the pipe to provide a barrier against corrosion. These coatings are typically made of fusion-bonded epoxy, polyethylene, or polyurethane. They protect the pipe from the surrounding environment, including soil, water, and chemicals, and help to extend the lifespan of the pipe. Internal linings are applied to the interior surface of the pipe to protect against corrosion from the transported fluid. These linings can be made of cement mortar, epoxy, or polyurethane. They provide a smooth and protective layer, preventing the formation of rust and scale on the pipe's inner surface. Cathodic protection is an electrochemical technique used to protect ductile iron pipes from corrosion. It involves the use of sacrificial anodes or impressed current systems to create a protective electrical current that counteracts the corrosion process. This method helps to prevent the formation of rust and extends the life of the pipe. It is important to note that the specific corrosion protection system for ductile iron pipes may vary depending on the application and environmental factors. Consulting with corrosion experts and adhering to industry standards and guidelines is crucial in determining the appropriate corrosion protection system for a particular ductile iron pipe installation.
Q:What is the expected noise reduction of ductile iron pipes?
The expected noise reduction of ductile iron pipes can vary depending on several factors, including the specific characteristics of the pipe material and design, the installation method, and the surrounding environment. However, generally speaking, ductile iron pipes have been found to provide significant noise reduction compared to other pipe materials. Ductile iron pipes are known for their superior acoustic performance due to their dense and robust construction. The material's high density helps to absorb and dampen noise vibrations, reducing the transmission of sound waves through the pipe. Additionally, the smooth internal surface of ductile iron pipes minimizes turbulence and friction, further contributing to noise reduction. Various studies and field tests have shown that ductile iron pipes can achieve noise reductions ranging from 10 to 20 decibels (dB) or even higher, depending on specific conditions. These noise reductions can significantly improve the acoustic environment in areas where the pipes are used, such as residential areas, hospitals, or schools. It is important to note that while ductile iron pipes can provide substantial noise reduction, other factors such as pipe connections, fittings, and valves can affect the overall acoustic performance. Proper installation techniques, including the use of effective seals and dampers, can further enhance noise reduction. In conclusion, ductile iron pipes are expected to deliver notable noise reduction benefits due to their dense construction, smooth internal surface, and efficient installation methods. However, it is essential to consider the specific project requirements and consult with professionals to determine the expected noise reduction levels based on the particular circumstances.
Q:The difference between spheroidal graphite cast iron pipe and HDPE water supply pipe
HDPE pipe is made of hot melt butt joint, and the strength of interface is very good. Ductile iron pipes are made of socket joint, and reinforced concrete piers shall be rammed on three links, elbows and other parts. In this regard, the cost of natural selection of ductile iron pipe, HDPE pipe than the choice of high.
Q:How is ductile iron pipe different from cast iron pipe?
Ductile iron pipe and cast iron pipe are commonly used in plumbing and drainage applications, but they have differences in composition, strength, and flexibility. To begin with, ductile iron pipe is made from a different iron alloy than cast iron pipe. Ductile iron contains more carbon and silicon, which gives it increased strength and durability. On the other hand, cast iron pipe is made from gray iron, which has higher carbon content but lacks the flexibility of ductile iron. Moreover, ductile iron pipe is renowned for its superior strength and resistance to impact. It can withstand higher pressures and is less likely to crack or break under heavy loads or external forces. Cast iron pipe, although strong, is more brittle and prone to fractures and failures. Another significant distinction is the flexibility of ductile iron pipe. It possesses greater flexibility and can endure bending and deformation without fracturing. This flexibility facilitates easier installation, particularly in areas with uneven terrain or where ground movement may occur. In contrast, cast iron pipe is less flexible and more rigid, making it unsuitable for applications that require flexibility. Additionally, ductile iron pipe has a smoother interior surface compared to cast iron pipe. This smoothness reduces friction, enhances flow efficiency, and minimizes the accumulation of sediment and deposits within the pipe, resulting in improved water flow and reduced maintenance needs. In conclusion, ductile iron pipe sets itself apart from cast iron pipe due to its composition, strength, flexibility, and smooth interior surface. Ductile iron offers superior strength, impact resistance, and flexibility, making it the preferred choice in various plumbing and drainage applications.
Q:What are the different types of fittings available for ductile iron pipe?
There are several different types of fittings available for ductile iron pipe. These fittings are designed to connect, redirect, or branch off the pipe in various configurations to suit different plumbing or piping systems. One common type of fitting is the flanged fitting, which features a flange or lip on one end that allows for easy bolted connection to another flanged component. Flanged fittings are commonly used in applications where a tight seal is required, such as in water or sewage systems. Another type of fitting is the mechanical joint fitting, which utilizes a gasket and a set of mechanical bolts to create a secure connection between two pieces of pipe. Mechanical joint fittings are often used in underground water or sewer systems. Push-on fittings are another popular option for ductile iron pipe. These fittings have a rubber gasket that is compressed onto the pipe, creating a watertight seal. Push-on fittings are quick and easy to install, making them ideal for applications where speed and efficiency are important. For situations where a change in direction is required, ductile iron pipe fittings such as elbows or bends are used. These fittings are designed to smoothly change the direction of the pipe without causing any significant flow restrictions. Additionally, there are saddle fittings available for ductile iron pipe. These fittings are used to create a branch connection on an existing pipeline without the need for cutting or welding. Saddle fittings are commonly used in irrigation or fire protection systems. Overall, the different types of fittings available for ductile iron pipe provide a range of options to meet the specific needs of different plumbing or piping systems. Whether it's flanged fittings for a tight seal, mechanical joint fittings for underground applications, push-on fittings for quick installation, or specialized fittings like elbows or saddle fittings, each type serves a specific purpose in the overall plumbing or piping system.
Q:Are ductile iron pipes suitable for use in mining tailings pipelines?
Mining tailings pipelines can utilize ductile iron pipes due to their suitability for this purpose. These pipes possess remarkable strength and durability, enabling them to endure the harsh and abrasive conditions often encountered in mining operations. With their high tensile strength, they can effectively handle the pressure and weight of the tailings material. Furthermore, their resistance to corrosion is crucial in mining environments where the tailings may contain corrosive chemicals or substances. Moreover, ductile iron pipes are known for their ease of installation and maintenance, providing a valuable advantage in time-sensitive mining operations. Ultimately, ductile iron pipes offer a dependable and cost-effective solution for mining tailings pipelines.
Q:How do ductile iron pipes handle dynamic loads?
Ductile iron pipes are well-suited to handle dynamic loads due to their high tensile strength and flexibility. The inherent ductility of the material allows the pipes to withstand the stress and strain caused by dynamic loads, such as water hammer or ground movement, without fracturing or breaking. This makes them a reliable choice for applications where frequent load variations or transient events are expected.

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