DUCTILE IRON PIPE K8 DN400

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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 perform in sandy soil conditions?: Ductile iron pipes perform well in sandy soil conditions due to their inherent strength and durability. The material's high tensile strength allows it to withstand the pressure exerted by the surrounding soil, preventing pipe deformation and breakage. Additionally, the corrosion resistance of ductile iron ensures a longer lifespan, even in corrosive sandy soil environments.

Q: What are the typical installation methods for ductile iron pipe?: The typical installation methods for ductile iron pipe involve several steps to ensure proper installation and functionality. Firstly, the trench is excavated to the required depth and width, accounting for the pipe diameter and bedding material. The bottom of the trench is then carefully prepared by removing any sharp objects or debris that could potentially damage the pipe. Next, a layer of suitable bedding material such as sand or fine gravel is placed evenly along the bottom of the trench to provide support and prevent any point loading on the pipe. The bedding material is compacted to ensure stability and eliminate any voids that could cause the pipe to settle or shift over time. After the bedding is in place, the ductile iron pipe is carefully lowered into the trench, taking precautions to prevent any damage to the pipe's protective coating. The pipes are then aligned and supported at regular intervals using appropriate pipe supports or blocks. Once the pipe is properly aligned, the joints are assembled by applying a lubricant and inserting a rubber gasket into the bell end of the pipe. The spigot end of the adjacent pipe is then inserted into the bell end, creating a secure and watertight seal. After the joints are assembled, the backfilling process begins. Backfill material, typically a combination of native soil and select backfill, is carefully placed around the pipe in layers and compacted to provide stability and prevent any voids. The backfilling process is carried out gradually, allowing for proper compaction and avoiding excessive pressure or damage to the pipe. Finally, the trench is fully backfilled and compacted, ensuring that the pipe is adequately supported and protected from external forces. Surface restoration is then performed to restore the area to its original condition, minimizing any disruption caused by the installation process. It is important to note that these installation methods may vary depending on project specifications, local regulations, and engineering recommendations. Therefore, it is essential to consult the manufacturer's guidelines and work closely with qualified professionals to ensure proper installation of ductile iron pipe.

Q: What are the requirements for the hydrostatic test of ductile iron pipes?: The pipe work pressure P is less than 0.5MPa, the test pressure is 2P, the pipe work pressure is greater than 0.5MPa, the test pressure is P+0.5. After the water pressure rises to the test pressure, the pressure is fixed for 10 minutes, and the pipe joint and the pipe body are not damaged and leaked.

Q: Can ductile iron pipes be used for underground irrigation systems?: Indeed, underground irrigation systems can utilize ductile iron pipes. These pipes find extensive use in a multitude of applications, such as water supply and distribution systems. Renowned for their robustness, durability, and resistance to corrosion, ductile iron pipes prove ideal for subterranean installations. Moreover, they possess exceptional pressure-bearing capabilities, enabling them to endure the elevated pressures commonly associated with irrigation systems. Nevertheless, it remains crucial to guarantee appropriate installation and maintenance to avert any potential harm or leakage within the system.

Q: Can ductile iron pipes be used for large-scale irrigation systems?: Ductile iron pipes are ideal for large-scale irrigation systems due to their strength, durability, and corrosion resistance. They can withstand high pressure and meet the demands of extensive irrigation. Furthermore, these pipes have a long lifespan, minimizing the need for frequent maintenance and replacements. In addition, they are cost-effective when compared to alternative materials used in irrigation systems. Consequently, ductile iron pipes are a prudent choice for large-scale irrigation systems, given their strength, durability, corrosion resistance, and cost-effectiveness.

Q: How can the cast iron pipe be connected?: Cast iron pipes are flanged and socket connected

Q: How are ductile iron pipes protected against erosion caused by high-velocity flow?: Ductile iron pipes are protected against erosion caused by high-velocity flow through various methods. One common approach is to apply an internal lining to the pipe, which can be made of materials such as cement mortar or polyethylene. This lining provides a smooth surface that reduces the friction and turbulence of the flowing water, thus minimizing the erosion potential. Additionally, external coatings, such as bitumen or epoxy, can be applied to protect the outer surface of the pipe from erosion caused by external factors like soil movement or abrasive materials. Regular inspection and maintenance of the pipes also play a crucial role in identifying and addressing any erosion-related issues to ensure their long-term durability.

Q: How do ductile iron pipes perform in high-pressure applications?: Ductile iron pipes are highly renowned for their exceptional strength and durability, making them incredibly suitable for applications with high pressure. These pipes are specifically designed to endure immense internal and external pressures, making them well-suited for both underground and above-ground installations where high-pressure conditions are anticipated. One of the primary advantages of utilizing ductile iron pipes in high-pressure applications lies in their capacity to resist cracking or bursting. The material's inherent ductility enables it to absorb and distribute pressure evenly, significantly reducing the risk of failure under high-pressure circumstances. Consequently, ductile iron pipes are a dependable choice for water supply systems, oil and gas pipelines, and other demanding applications subject to substantial pressure. Moreover, ductile iron pipes exhibit outstanding corrosion resistance properties, further enhancing their performance in high-pressure environments. These pipes are typically coated with a protective layer, such as cement mortar or epoxy, which serves as a barrier against corrosion. By preventing the formation of rust or scale inside the pipe, this protective coating ensures smooth flow and upholds structural integrity even under high-pressure conditions. Furthermore, ductile iron pipes possess a remarkable tolerance for external loads, including soil pressure, traffic loads, and various other forces. This exceptional strength enables them to withstand the additional stress often encountered in high-pressure applications, guaranteeing the long-term reliability and performance of the pipe system. In conclusion, ductile iron pipes offer exceptional performance in high-pressure applications. Their strength, durability, corrosion resistance, and ability to withstand external loads make them a reliable choice for a wide range of industries and infrastructure projects where high-pressure conditions are a significant concern.

Q: How does ductile iron pipe perform in extreme weather conditions?: Ductile iron pipes are renowned for their exceptional performance in adverse weather conditions. These pipes demonstrate remarkable durability, resistance, and flexibility, making them suitable for enduring harsh weather such as extreme temperatures, heavy rainfall, snowfall, and even earthquakes. One of the notable characteristics of ductile iron is its capacity to withstand damage caused by freezing temperatures. Unlike other materials, ductile iron pipes possess a low coefficient of thermal expansion, enabling them to resist the expansion and contraction that occurs during freeze-thaw cycles without experiencing cracks or breaks. Consequently, these pipes remain intact and continue to function optimally even in extremely cold conditions. Furthermore, ductile iron pipes exhibit excellent resistance to corrosion, rendering them highly resilient to the corrosive effects of severe weather. They are shielded by a sturdy zinc coating, which acts as a barrier against rust and other forms of corrosion. This coating, in conjunction with the inherent strength of ductile iron, grants these pipes exceptional resistance to the corrosive effects of rain, snow, and moisture. Moreover, ductile iron pipes possess superior flexibility, allowing them to accommodate ground movement and seismic activity. In areas prone to earthquakes or soil shifting, these pipes can absorb stress and strain without fracturing, guaranteeing a continuous supply of water and sewage services even in the most challenging weather conditions. Overall, ductile iron pipes excel in extreme weather conditions due to their durability, resistance to freezing, corrosion, and flexibility. Their ability to withstand the elements ensures an uninterrupted supply of water and sewage systems, providing reliability and peace of mind to utility providers and communities, even in the most unforgiving environments.

Q: Do ductile iron pipes have inner enamel?: If the market supply is indeed difficult, can be done by the owners, Design Institute of supplier relationship; if the design institute requires it to provide products can persist in wilfully and arbitrarily, the available information (if the market can not supply, design a hair ah).

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