DUCTILE IRON PIPES K8 DN125

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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: Ductile cast iron can replace copper sleeve: The tensile and compressive capacity of the ball milled cast iron is not as good as that of copper. The hardness of Rongchang graphite copper sheath can reach HB210

Q: How do ductile iron pipes handle traffic vibrations?: Ductile iron pipes possess exceptional strength and durability, making them highly effective in managing traffic vibrations. Their inherent properties enable them to withstand fractures or cracks caused by external forces, such as vibrations induced by traffic. The pipes' remarkable tensile strength and elasticity allow them to absorb and dissipate the energy produced by traffic vibrations. This capability minimizes the impact on the pipes and prevents significant damage or failure. Moreover, the material's ductility enables it to deform slightly under stress without breaking, further enhancing its ability to endure vibrations. Additionally, ductile iron pipes exhibit superior resistance to corrosion and other forms of deterioration. This resistance guarantees the pipes' structural integrity over an extended period, even when subjected to repetitive vibrations caused by heavy traffic. In conclusion, ductile iron pipes are well-suited to handle traffic vibrations due to their robust nature, capacity to absorb energy, and resistance to corrosion. These characteristics establish them as a dependable choice for underground infrastructure in areas with high traffic volumes, ensuring a pipeline system that is durable and efficient in the long run.

Q: How are ductile iron pipes restrained against axial thrust forces?: Ductile iron pipes are restrained against axial thrust forces through a combination of mechanical restraints and soil resistance. One common method of restraining axial thrust forces is by using thrust blocks. Thrust blocks are concrete structures that are built at bends, tees, and other locations where changes in direction occur in the pipeline. These blocks are designed to resist the axial forces and prevent the pipes from shifting or moving due to the pressure exerted by the flowing fluid. Additionally, mechanical restraints such as pipe restraints, thrust collars, and anchor blocks are used to provide further support and prevent axial movement. Pipe restraints are devices that are installed around the pipe and connected to adjacent structures, such as walls or concrete collars, to prevent movement. Thrust collars are also used to absorb and distribute the thrust forces generated by the flowing fluid. These collars are typically made of ductile iron or steel and are secured around the pipe to resist axial movement. Furthermore, soil resistance plays a significant role in restraining axial thrust forces. The weight of the soil surrounding the pipe creates frictional resistance, which helps counteract the axial forces. Proper trench backfilling, compaction, and adequate embedment of the pipe in the soil are essential to ensure effective soil resistance. In summary, ductile iron pipes are restrained against axial thrust forces through a combination of mechanical restraints such as thrust blocks, pipe restraints, and thrust collars, as well as soil resistance provided by proper trench backfilling and compaction. This comprehensive approach ensures that the pipes remain securely in place and can withstand the axial forces generated by the fluid flowing through them.

Q: Can ductile iron pipes be used for both water and wastewater applications?: Yes, ductile iron pipes can be used for both water and wastewater applications. Ductile iron pipes are known for their durability, strength, and corrosion resistance, making them suitable for a wide range of applications including water distribution, sewage systems, and wastewater treatment plants. These pipes are designed to withstand high pressure and are capable of handling the flow of both water and wastewater. Additionally, ductile iron pipes have a long lifespan, reducing the need for frequent replacements and maintenance, which makes them a cost-effective choice for both water and wastewater applications.

Q: How does ductile iron pipe perform in areas with high soil contamination?: Due to its inherent strength, durability, and corrosion resistance properties, ductile iron pipe is highly effective in areas with high soil contamination. The material used in manufacturing these pipes is highly resistant to chemical attack, making it suitable for handling various types of contaminated soils, including those with high levels of acids, alkalis, and other corrosive substances. The corrosion resistance of ductile iron pipes is primarily due to their protective internal and external linings. These linings are designed to prevent contact between the pipe material and the surrounding soil or fluids, acting as a barrier that prevents the penetration of corrosive elements and reduces the risk of pipe degradation or failure. Additionally, external coatings or cathodic protection systems can further enhance the resistance of ductile iron pipes to soil contamination, extending their service life. Compared to materials such as steel or concrete, ductile iron pipes offer significant advantages in areas with high soil contamination. Their high strength enables them to withstand external loads imposed by the contaminated soil, reducing the risk of structural failure or deformation. Furthermore, the inherent flexibility of ductile iron allows it to absorb ground movements or settlement without compromising its integrity, making it a reliable choice for areas prone to soil instability or shifting. Moreover, the smooth internal surface of ductile iron pipes minimizes friction and maintains efficient flow rates, even in the presence of contaminants. This is particularly important in areas with high soil contamination, where debris or sedimentation can accumulate and hinder fluid flow. The smooth bore of ductile iron pipes reduces the risk of clogging and ensures the continuous and reliable conveyance of fluids, even in challenging soil conditions. In conclusion, ductile iron pipe is an excellent choice for areas with high soil contamination. Its exceptional corrosion resistance, strength, flexibility, and smooth internal surface make it a reliable and durable solution for conveying fluids in these challenging environments.

Q: What is the typical lifespan of ductile iron pipe?: The typical lifespan of ductile iron pipe is around 50 to 100 years, depending on various factors such as the quality of installation, maintenance practices, and environmental conditions.

Q: Are ductile iron pipes suitable for gravity flow applications?: Yes, ductile iron pipes are suitable for gravity flow applications. Ductile iron pipes have high strength and durability, making them ideal for carrying fluids under gravity. They can withstand the pressure and weight of fluid flow without the need for additional support or reinforcement. Additionally, ductile iron pipes have excellent corrosion resistance, which ensures their long-term performance in gravity flow systems.

Q: Are ductile iron pipes resistant to abrasion or wear?: Indeed, ductile iron pipes exhibit remarkable resistance against abrasion and wear. Renowned as cast iron as well, ductile iron represents a robust and enduring substance exclusively crafted to endure abrasive circumstances. Ductile iron's distinct microstructure grants superb resistance to abrasion, rendering it an optimal selection for scenarios wherein pipelines face extensive levels of wear. Furthermore, the extended lifespan of ductile iron pipes showcases their enduring capacity against abrasion and wear throughout time.

Q: Can ductile iron pipe be used for underground applications?: Yes, ductile iron pipe can be used for underground applications.

Q: Can ductile iron pipes be used for pressure surge applications?: Yes, ductile iron pipes can be used for pressure surge applications. Ductile iron is known for its high strength and durability, making it suitable for handling pressure surges caused by water hammer or other transient events. It has the ability to absorb and withstand these sudden pressure changes without experiencing significant damage or failure. However, proper design considerations and installation techniques should be followed to ensure the safe and effective use of ductile iron pipes in pressure surge applications.

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