DUCTILE IRON PIPE K9 DN500

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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 pipes be used for drainage systems in airports?: Ductile iron pipes are an excellent choice for drainage systems in airports. These pipes are well-known for their durability, strength, and ability to resist corrosion, making them suitable for a variety of applications, including drainage systems. They can handle heavy loads, which is crucial in airports where aircraft and vehicles are constantly moving. Moreover, ductile iron pipes are flexible, making installation and modification easy when needed. Additionally, they have a long lifespan, reducing the need for frequent maintenance or replacement. Therefore, ductile iron pipes are a reliable option for airport drainage systems, ensuring efficient water flow and preventing water accumulation to maintain safe and operational facilities.

Q:Can ductile iron pipe be used for geothermal heat exchange systems?: Indeed, geothermal heat exchange systems can utilize ductile iron pipe. Renowned for its robustness and resilience, ductile iron pipe is perfectly suited to withstand the elevated temperatures and pressures typically found in such systems. Moreover, its exceptional resistance to corrosion is of utmost importance in geothermal applications, where minerals and chemicals present in the earth can induce corrosion. Additionally, the commendable thermal conductivity of ductile iron pipe facilitates efficient heat transfer within geothermal systems. In conclusion, ductile iron pipe stands as a dependable and economical option for geothermal heat exchange systems.

Q:How are ductile iron pipes protected against stray electrical currents?: To safeguard water and sewer systems, ductile iron pipes are shielded from stray electrical currents through a technique called cathodic protection. This process entails the application of a low-voltage direct current (DC) to the pipes, generating a defensive electrical field around them. To achieve cathodic protection, sacrificial anodes or impressed current systems are installed near the ductile iron pipes. Sacrificial anodes, composed of a more electrically active metal like zinc or magnesium, are connected to the pipes and act as the electrical current source. Over time, these anodes corrode, sacrificing themselves to shield the pipes from corrosion caused by stray electrical currents. However, impressed current systems utilize an external power source to supply the protective electrical current. Rectifiers are employed to convert alternating current (AC) to direct current (DC), which is then administered to the pipes through anodes. This approach provides greater control over the amount of current applied, ensuring optimal protection. In both scenarios, the electrical current flowing through the sacrificial anodes or impressed current systems establishes a protective barrier around the ductile iron pipes. This barrier impedes the flow of stray electrical currents through the pipes, thus diminishing the risk of corrosion and prolonging the infrastructure's lifespan. Regular monitoring and maintenance of the cathodic protection system are crucial to uphold its efficacy. This involves inspecting the anodes, assessing the levels of electrical current, and making any necessary adjustments or replacements to maintain the desired level of protection. To summarize, cathodic protection is a dependable and widely utilized method for safeguarding ductile iron pipes against stray electrical currents. By preserving the integrity and longevity of water and sewer systems, it plays a vital role in ensuring their functionality.

Q:Are ductile iron pipes suitable for sewage treatment plants?: Yes, ductile iron pipes are suitable for sewage treatment plants. Ductile iron pipes are known for their durability, strength, and corrosion resistance, making them ideal for handling the corrosive and abrasive nature of sewage. They can withstand high pressure and are capable of accommodating heavy loads and ground movements, making them a reliable choice for sewage treatment facilities. Additionally, their smooth interior surface minimizes friction, reducing the risk of clogs and improving the flow of wastewater.

Q:What is the composition of ductile iron pipes?: Ductile iron pipes consist mainly of iron, with small amounts of carbon, silicon, and other alloying elements. The iron content typically ranges from 90% to 94%, while carbon content is usually around 3% to 4%. Silicon is added between 1.5% to 3%, which enhances the ductility and strength of the iron. Smaller quantities of manganese, sulfur, and phosphorus may also be present. The composition of ductile iron pipes is carefully engineered to achieve specific properties. By adding carbon and silicon, the hardness and strength of the iron are improved, making it suitable for demanding applications. These alloying elements also contribute to the pipes' ductility, allowing them to be easily bent and molded without breaking. In summary, the composition of ductile iron pipes is designed to strike a balance between strength, ductility, and resistance to corrosion. This makes them ideal for use in water and sewage systems, where they can endure high pressure, bear heavy loads, and resist the corrosive effects of water and other chemicals.

Q:How to properly maintain FRP pipes: The wall of the pipe is smoothReduce flow resistance, increase flow speed and reduce energy consumption. Compared with the same size steel pipe, the flow rate of the same volume can be increased by about 10%, and no fouling and long-term use can not reduce the flow rate. The protection of cables in interference and heavy corrosion environment is better.

Q:Are ductile iron pipes compatible with other pipe materials?: Yes, ductile iron pipes are compatible with other pipe materials. They can be connected to pipes made of various materials such as PVC, HDPE, steel, and more, using appropriate fittings and connectors.

Q:What is the average weight of ductile iron pipes?: The weight of ductile iron pipes can differ based on their specific dimensions and specifications. However, as a general rule, the weight of ductile iron pipes usually falls within the range of 50 to 200 pounds per foot. Various factors, including the pipe's diameter, wall thickness, and length, affect its weight. It is essential to understand that these weights are averages, and the actual weight of a particular ductile iron pipe may differ. To accurately determine the weight of a ductile iron pipe, it is recommended to consult the manufacturer's specifications or engineering guidelines.

Q:What are the interface forms of ductile iron pipes? The best drawings are available. Thank you: Because of this interface and the corresponding T sealing aprons can withstand greater deflection angle and greater tolerances, especially suitable for unstable formations and corners.

Q:How does ductile iron pipe handle thermal expansion and contraction?: Ductile iron pipe is well-known for its ability to handle thermal expansion and contraction effectively. This is primarily due to its unique material properties and design characteristics. Firstly, ductile iron pipe has a high coefficient of linear expansion, which means it expands and contracts relatively more compared to other materials when subjected to temperature changes. This property allows the pipe to accommodate thermal expansion and contraction without causing excessive stress or deformation. Additionally, ductile iron pipes are designed with flexible joints that can absorb the movement caused by thermal expansion and contraction. These joints, such as push-on or mechanical joints, provide a certain level of flexibility and allow the pipe to expand and contract within a specific range without compromising its structural integrity. Furthermore, the material composition of ductile iron itself contributes to its ability to handle thermal expansion and contraction. Ductile iron is a type of cast iron alloy that contains nodular graphite in its microstructure, providing it with enhanced ductility and tensile strength. This inherent ductility enables the pipe to withstand the stresses induced by thermal expansion and contraction without fracturing or breaking. Overall, ductile iron pipe is designed and manufactured to effectively handle thermal expansion and contraction. Its high coefficient of linear expansion, flexible joints, and ductile material properties all work together to ensure that the pipe can accommodate temperature changes without causing any significant issues or structural failures.

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