• DUCTILE IRON PIPES C Class DN700 System 1
  • DUCTILE IRON PIPES C Class DN700 System 2
  • DUCTILE IRON PIPES C Class DN700 System 3
DUCTILE IRON PIPES C Class DN700

DUCTILE IRON PIPES C Class DN700

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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:Does the cast iron pipe need separate corrosion protection?
No, the inner and outer corrosion protection of the tube has been done.
Q:The difference between ductile cast iron pipe and machine-made cast iron pipe
Different installation methods, ductile iron pipes are common flexible sealing ring, slide into the connection; the main drainage pipe is W and B type, clamp connection and mechanical connection, the inner gasket ring.
Q:Which is better, ductile iron pipe and spray plastic pipe?
Ductile iron pipe corrosion resistance, strength, it is said that the Ming Dynasty ordinary cast iron works now, and now has a new type of dedicated, can be used, construction becomes very convenient, ductile iron pipe has no effect on water quality. Plastic sprayed steel pipe is a new type of pipeline with higher price.
Q:Can ductile iron pipes be used for underground fuel storage systems?
No, ductile iron pipes are not suitable for underground fuel storage systems. They are more commonly used for water and sewer applications due to their strength and durability in carrying liquids. Underground fuel storage systems require materials that are specifically designed to handle the corrosive nature of fuel and prevent leaks or contamination, such as double-walled fiberglass or steel tanks.
Q:How is ductile iron pipe installed?
Ductile iron pipe is typically installed using a process called trenchless technology or open-cut method. In the trenchless technology approach, a hole is drilled into the ground and the ductile iron pipe is then pushed or pulled into the hole using hydraulic jacks or winches. This method minimizes disruptions to the surrounding environment and reduces the need for extensive excavation. In the open-cut method, a trench is excavated to the required depth and width for the ductile iron pipe. The trench is then prepared by removing any debris or obstructions and ensuring a stable base. The pipe is then lowered into the trench and aligned properly using laser or surveying equipment. After the pipe is positioned, joints are connected using a rubber gasket or mechanical joint. The joints are typically sealed to prevent leakage. Backfill material is then carefully placed around the pipe, ensuring proper compaction to provide stability and support. The backfill is typically done in layers to avoid excessive settlement. Once the installation is complete, the pipe is tested for leaks and pressure to ensure its integrity. This may involve hydrostatic testing, where the pipe is filled with water and monitored for any signs of leakage or pressure loss. Overall, the installation of ductile iron pipe requires careful planning, excavation, alignment, joint connection, backfilling, and testing. It is essential to follow industry standards and guidelines to ensure a successful and reliable installation that meets the required specifications.
Q:What are the risks in the process of conveying ductile iron pipes?
Pile up: when the pipe is stacked, the lower part of the pipe should be covered with a tie or cushion block. The socket of the pipe is interlocked with each other, and the stop wedge must be put in place to prevent the pipe from rolling. Not allowed to be piled on marshes, rough slopes, or badly polluted areas.
Q:Are ductile iron pipes suitable for use in power plants?
Yes, ductile iron pipes are suitable for use in power plants. Ductile iron is a strong and durable material that can withstand high pressure and temperature conditions, making it ideal for transporting various fluids, such as water, steam, and chemicals within power plants. Additionally, ductile iron pipes have excellent corrosion resistance properties, which is crucial in power plants where exposure to moisture and chemicals is common. Furthermore, ductile iron pipes have a long service life and require minimal maintenance, reducing the overall operating costs for power plants. Overall, ductile iron pipes offer a reliable and cost-effective solution for fluid transportation within power plants.
Q:What is the expected deflection of ductile iron pipes under load?
The deflection of ductile iron pipes under load can vary depending on several factors, including diameter, wall thickness, material properties, and the magnitude and distribution of the load applied. Ductile iron pipes generally possess a high resistance to deflection due to their inherent strength and durability. They are designed to withstand substantial loads and are commonly used in applications where high pressure and heavy loads are anticipated. Engineers typically employ structural analysis techniques such as finite element analysis or beam theory calculations to ascertain the expected deflection. These methods consider the specific geometry and material properties of the ductile iron pipe to predict its behavior under load. In practice, ductile iron pipes are designed with a maximum allowable deflection, which is usually specified by industry standards or local regulations. This maximum allowable deflection ensures the pipe's structural integrity and functionality. It is worth noting that the expected deflection of ductile iron pipes can also be influenced by external factors like soil conditions, installation methods, and temperature fluctuations. Therefore, it is crucial to employ proper installation techniques and adhere to industry guidelines to ensure the pipes perform as expected and meet the required deflection limits.
Q:Can ductile iron pipes be used for both water and sewage systems?
Ductile iron pipes can serve for both water and sewage systems, owing to their remarkable strength and durability. Renowned for their exceptional mechanical properties, these pipes can endure the immense pressure and stress encountered in such systems. Furthermore, their resistance to corrosion renders them optimal for transporting both clean water and sewage. Consequently, ductile iron pipes emerge as a dependable and adaptable option for water and sewage systems, given their wide-ranging applications.
Q:The difference between flexible joint cast iron pipe and flexible anti-seismic cast iron pipe
The appendix is selected so that readers can understand the design, construction and other contents of the ductile iron pipe. This book can be used for the manufacture and application of ductile iron pipe in the field of scientific research personnel, designers, production personnel, construction personnel, management personnel to read.

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