• 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 pipe be used for directional drilling?
Indeed, it is possible to utilize ductile iron pipe for directional drilling. This method involves the installation of pipes, cables, and conduits beneath the ground in a curved or horizontal trajectory. Ductile iron pipes are renowned for their exceptional strength and flexibility, rendering them apt for this technique. They can be effortlessly bent and maneuvered while drilling, thereby enabling the installation of pipelines in demanding terrains and the traversing of obstacles such as rivers, highways, and buildings. Moreover, the corrosion resistance of ductile iron pipes is superb, thereby ensuring their durability and reliability for directional drilling endeavors.
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 are known for their high corrosion resistance, making them suitable for various soil conditions, including those with high salinity levels. The pipes are typically coated with a protective layer, such as polyethylene or zinc, which further enhances their resistance to corrosion from saltwater or saline soils. Additionally, proper installation techniques, such as proper backfilling and compacting of the soil around the pipes, can help minimize the potential impact of high soil salinity on the performance and longevity of ductile iron pipes.
Q:How do ductile iron pipes handle soil movement?
Ductile iron pipes are renowned for their exceptional strength and durability, rendering them highly adept at managing soil movement. These pipes are engineered to withstand the external loads and pressures arising from soil settlement, ground shifting, or other environmental elements. A significant characteristic of ductile iron pipes lies in their flexibility. Unlike inflexible materials such as cast iron or concrete pipes, ductile iron pipes possess a certain degree of elasticity, enabling them to endure soil movement without succumbing to cracks or fractures. This flexibility empowers the pipes to absorb the stresses imposed by the soil, effectively preventing any substantial harm to the pipeline system. Furthermore, ductile iron pipes exhibit remarkable tensile strength, allowing them to resist the pulling forces that arise from soil movement. The pipes can endure the expansion and contraction of the surrounding soil, thereby diminishing the likelihood of pipe deformation or failure. Additionally, ductile iron pipes are frequently installed using proper bedding and backfilling techniques to further enhance their capacity to handle soil movement. Adequate bedding materials, such as crushed stone or sand, are utilized to deliver stable support to the pipes and distribute the external loads uniformly. This serves to minimize the impact of soil movement on the pipes and uphold their structural integrity. In conclusion, ductile iron pipes are purposefully designed to proficiently manage soil movement by virtue of their flexibility, high tensile strength, and appropriate installation methods. These pipes can effectively endure the stresses generated by soil settlement, ground shifting, or other soil-related factors, ensuring dependable and long-lasting performance in a variety of environmental conditions.
Q:What is the expected pressure rating of ductile iron pipes?
The pressure rating of ductile iron pipes can vary depending on factors like pipe diameter, wall thickness, and installation joint type. However, ductile iron pipes are generally recognized for their durability and ability to handle high pressure. In most instances, ductile iron pipes are designed and produced to meet or surpass industry standards like AWWA C151 or C115/A21.15. These standards establish the minimum pressure rating for ductile iron pipes, which typically range from 150 to 350 psi for water transmission purposes. It's important to note that the pressure rating is also influenced by the pipe's class, which corresponds to the wall thickness. Ductile iron pipes are commonly available in different classes such as Class 50, Class 51, Class 52, etc. Each class has its own pressure rating, with higher classes offering greater strength and pressure resistance. To determine the exact pressure rating, it is advisable to refer to the manufacturer's specifications and guidelines for the specific ductile iron pipes being used. Additionally, other factors like pipe support, installation methods, and operating conditions should be considered to ensure the safe and efficient functioning of the ductile iron pipe system.
Q:Can ductile iron pipes be used for irrigation pivot systems?
Indeed, irrigation pivot systems can utilize ductile iron pipes. Renowned for their robustness, longevity, and resistance to corrosion, ductile iron pipes are apt for numerous purposes, including irrigation. These pipes have the capability to withstand substantial water pressure, guaranteeing a dependable and enduring means of transporting water to irrigation pivot systems. Moreover, ductile iron pipes harmonize seamlessly with a variety of fittings and connectors commonly employed in irrigation systems, thereby facilitating effortless installation and upkeep. All in all, employing ductile iron pipes in irrigation pivot systems emerges as a pragmatic decision that ensures efficacious water distribution while minimizing the likelihood of pipe failure.
Q:What is the relationship between continuous cast iron pipe and ductile iron pipe?
Cast iron pipes are divided into continuous cast iron pipes and centrifugal cast iron pipes according to different casting methods. They are divided into gray cast iron pipes and ductile iron pipes according to different materials.
Q:What are the typical bedding and backfill requirements for ductile iron pipes?
The typical bedding and backfill requirements for ductile iron pipes are important to ensure the proper installation and long-term performance of the pipes. Generally, the bedding material should be a granular material that provides support and uniform load distribution to the pipe. This can include materials such as sand, gravel, or crushed stone. The bedding material should be placed in a continuous and uniform layer along the bottom of the trench, with a minimum thickness of 6 inches. The width of the bedding layer should be at least 1.5 times the outside diameter of the pipe, or as specified by the pipe manufacturer. Backfill material is used to fill the remaining space around the pipe after the bedding is in place. The backfill material should also be a granular material, free from large stones, debris, or organic matter. It should be compacted in layers around the pipe, typically in 6-inch increments, using appropriate compaction equipment. The backfill should be placed evenly around the pipe, ensuring that there are no voids or gaps. It is important to avoid excessive compaction that could lead to damage or deformation of the pipe. The backfill material should extend above the top of the pipe to provide a minimum of 12 inches of cover. In addition to the bedding and backfill requirements, it is essential to follow any specific guidelines provided by the pipe manufacturer. These guidelines may include recommendations for specific materials, compaction methods, or additional protective measures. Overall, the proper bedding and backfilling of ductile iron pipes is crucial for maintaining the structural integrity and preventing damage or failure of the pipe system. Adhering to industry standards and manufacturer specifications ensures the longevity and performance of the pipes in various applications.
Q:It's not easy to drill ductile iron with cobalt high speed steel bit. Please help to point it out
Choose carbide or whole carbide drill, about 90HRC in hardness. But it requires a high number of drills, around 3000.
Q:Can ductile iron pipes be used for underground water treatment systems?
Indeed, underground water treatment systems can utilize ductile iron pipes. Renowned for their robustness and longevity, these pipes are well-suited for a range of uses, including underground water treatment systems. They possess exceptional resistance to corrosion, rendering them perfect for transporting water through even the harshest subterranean surroundings. Furthermore, ductile iron pipes boast a remarkable load-bearing capacity, enabling them to withstand the immense pressure and weight exerted by the soil above. Additionally, their versatility allows for simple installation and maintenance, making them a sensible option for underground water treatment systems.
Q:Can ductile iron pipes be used for irrigation systems in saline soil conditions?
Yes, ductile iron pipes can be used for irrigation systems in saline soil conditions. Ductile iron pipes are known for their durability and corrosion resistance, making them suitable for various soil conditions, including saline soil. Saline soil contains high levels of salt, which can cause corrosion and deterioration of certain materials. However, ductile iron pipes have a protective coating, such as cement mortar lining or polyethylene encasement, which provides an additional layer of protection against corrosion. This ensures that the pipes can withstand the corrosive effects of saline soil and maintain their structural integrity over a long period of time. Additionally, ductile iron pipes have a high tensile strength, making them resistant to cracks and breaks, which is important for irrigation systems that require a continuous and reliable water supply. Therefore, ductile iron pipes are a suitable choice for irrigation systems in saline soil conditions.

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