DUCTILE IRON PIPES C Class DN1200

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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: Are ductile iron pipes suitable for power plant applications?: Ductile iron pipes are a suitable choice for power plant applications. Unlike traditional cast iron pipes, ductile iron pipes have improved strength, durability, and flexibility. These properties make them ideal for power plants, where they face high pressure, extreme temperatures, and corrosive environments. Power plants require a reliable and strong piping system to transport various fluids, including water, steam, and chemicals. Ductile iron pipes have a high tensile strength and can withstand high pressure, ensuring the safe and efficient flow of fluids within a power plant. They are particularly suitable for power generation applications that involve high-pressure steam. Moreover, ductile iron pipes have excellent corrosion resistance, which is crucial in power plants where many fluids are highly corrosive. The internal and external linings of these pipes protect them from corrosion, ensuring a longer service life and reducing maintenance costs. This corrosion resistance also makes them suitable for transporting chemicals and wastewater within a power plant. In addition, ductile iron pipes can withstand extreme temperatures. Power plants often operate at high temperatures, and ductile iron pipes can handle these conditions without compromising their structural integrity. They have a high melting point and can resist thermal expansion and contraction, making them a suitable choice for applications involving hot fluids and steam. Furthermore, ductile iron pipes are cost-effective compared to other commonly used materials in power plants, such as stainless steel or carbon steel. They offer a balance between performance and cost, making them an attractive choice for power plant applications. In conclusion, ductile iron pipes have the necessary characteristics to meet the demands of power plant applications. Their strength, durability, flexibility, corrosion resistance, and ability to withstand high pressures and extreme temperatures make them well-suited for such environments. Additionally, their cost-effectiveness makes them a practical choice for power plant piping systems.

Q: Are ductile iron pipes resistant to alkali attacks?: Ductile iron pipes have been proven to be highly resistant to alkali attacks. The material used in ductile iron pipes, known as ductile cast iron, is formulated with specific chemical compositions that provide exceptional corrosion resistance. This resistance extends to alkali attacks, which are chemical reactions that occur when alkaline substances come into contact with metals or other materials. Ductile iron pipes have a dense and protective oxide film on their inner and outer surfaces, which acts as a barrier against chemical attacks. This oxide film forms naturally over time, and its composition and structure provide excellent resistance to alkali attacks. Additionally, ductile iron pipes are often coated with various protective layers, such as epoxy or zinc, to further enhance their resistance to corrosion and chemical reactions. It is important to note that while ductile iron pipes are highly resistant to alkali attacks, the severity and concentration of the alkali substances can still impact their overall performance. In extreme cases, very high concentrations of alkali substances or prolonged exposure to aggressive alkaline environments may eventually cause some damage to the protective layers of the pipes. However, under normal conditions and within acceptable parameters, ductile iron pipes are considered to have excellent resistance to alkali attacks.

Q: Are ductile iron pipes suitable for power plant cooling systems?: Ductile iron pipes are well-suited for power plant cooling systems, offering numerous advantages that render them perfect for such applications. Firstly, their high strength and durability enable them to withstand the immense pressure and heavy loads typically associated with power plant cooling systems. Additionally, these pipes exhibit excellent resistance to corrosion, a vital feature in an environment where water and other cooling fluids continuously flow. Moreover, they boast good thermal conductivity, ensuring efficient heat transfer away from power plant equipment and contributing to the overall cooling process. Lastly, ductile iron pipes are cost-effective compared to other commonly used materials in power plant cooling systems, making them a practical choice. Ultimately, due to their strength, corrosion resistance, thermal conductivity, and cost-effectiveness, ductile iron pipes represent a reliable and suitable option for power plant cooling systems.

Q: Fire water supply network adopts ductile iron pipe, the test pressure should be no more than MPa: To your selected fire pump highest lift 1.5 times to suppress, generally not more than 1.6MPa, if the use of ductile iron pipe, test pressure according to 2MPa to suppress.

Q: Are ductile iron pipes suitable for pressure reducing valve stations?: Ductile iron pipes prove to be suitable for pressure reducing valve stations due to their strength and durability, making them an ideal choice for applications involving high pressure. Pressure reducing valve stations, which regulate and decrease the pressure of a fluid or gas in a pipeline system, can rely on ductile iron pipes to handle the exerted pressure, ensuring an efficient and reliable operation. Moreover, the excellent resistance to corrosion exhibited by ductile iron pipes is crucial in upholding the integrity of the pipeline system, thereby preventing leaks or failures. Overall, the necessary strength, durability, and corrosion resistance required for pressure reducing valve stations are provided by ductile iron pipes.

Q: What is the difference between spheroidal graphite cast iron QT400-15 and QT400-15A? What does the A mean later?: The front is the material grade, and the back of the A should have special requirements.

Q: What is the expected bedding and backfill requirements for ductile iron pipes?: The expected bedding and backfill requirements for ductile iron pipes typically involve using a suitable bedding material, such as crushed stone, to provide support and stability to the pipe. This is followed by proper backfilling around the pipe with a granular material, such as sand or gravel, to protect the pipe from external loads and prevent damage. The specific requirements may vary based on factors such as soil conditions, pipe diameter, and depth of installation. It is important to consult relevant standards and guidelines to ensure proper installation and long-term performance of the ductile iron pipes.

Q: How are leaks repaired in ductile iron pipe?: Leak repairs in ductile iron pipes vary depending on the severity and location of the leak. One technique commonly used involves the application of epoxy-based sealants or leak repair clamps. For small leaks, epoxy sealants are commonly utilized. A specialized epoxy compound is applied to the leaking area, which then hardens and forms a durable seal. The epoxy is carefully spread on the pipe's surface, covering the leak and any surrounding damage. This method effectively addresses small leaks and offers a long-lasting solution. In cases where the leak is larger or more severe, leak repair clamps are often utilized. These clamps secure tightly around the pipe using rubber gaskets and bolts to provide a mechanical seal. The clamp's pressure compresses the gasket onto the pipe, creating a watertight seal and preventing further leakage. Leak repair clamps come in various sizes to accommodate different pipe diameters. Proper preparation of the pipe surface is crucial before applying either repair method. The area around the leak must be thoroughly cleaned and dried to ensure good adhesion of the epoxy or proper sealing with the clamp. It is also essential to adhere to the manufacturer's instructions and guidelines for the chosen repair method to achieve a successful and long-lasting repair. It is important to note that these repair methods are temporary solutions and may not be suitable for all situations. In cases of extensive pipe damage or aging infrastructure, it may be necessary to replace the affected pipe section entirely. It is recommended to seek professional assessment and guidance from qualified technicians or plumbers when dealing with leaks in ductile iron pipes. This ensures proper repairs and minimizes the risk of future issues.

Q: What is the expected thrust restraint method for ductile iron pipes?: The expected thrust restraint method for ductile iron pipes is typically achieved through the use of thrust blocks or restraints, which are designed to counteract the forces generated by the fluid pressure within the pipeline. These blocks or restraints are typically made of concrete or other sturdy materials and are strategically placed at bends, tees, and other locations where changes in direction occur. They help to anchor the pipes and prevent them from moving or being displaced due to the thrust forces.

Q: What is the average cost of ductile iron pipe?: The average cost of ductile iron pipe can vary depending on several factors such as the diameter, length, and thickness of the pipe, as well as the supplier and location. On average, however, ductile iron pipe can range from approximately $40 to $200 per linear foot. It is important to note that these prices are estimates and can fluctuate based on market conditions and other variables. It is recommended to contact local suppliers or distributors for specific pricing information tailored to your project requirements.

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