DUCTILE IRON PIPE C Class DN500 System 1

DUCTILE IRON PIPE C Class 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: Does centrifugal cast iron pipe work well with lining cement? Will it scale and breed bacteria?: Poor hydraulic performance and high energy consumption. The roughness coefficient of the prestressed reinforced concrete pipe is between 0.013 - 0.014, so that the pipeline resistance of the pipeline with the same pipe diameter is higher than that of the same water content. Because of its high roughness, after a period of use, the pipeline will be blocked by bacteria, shellfish breeding and reproduction. As the service life increases, the inner diameter of the pipe will gradually shrink and the resistance will increase.

Q: Can ductile iron pipe be used for hot water applications?: Indeed, hot water applications can make use of ductile iron pipe. Renowned for its robustness, longevity, and exceptional resistance to corrosion, ductile iron pipe proves itself ideal for diverse applications, including hot water systems. Its capability to withstand high temperatures and pressure renders it a dependable choice for the conveyance of hot water. Moreover, its thermal conductivity properties facilitate efficient heat transfer, guaranteeing the effective delivery of hot water throughout the system. Consequently, when evaluating materials for hot water applications, ductile iron pipe emerges as a fitting alternative.

Q: The difference between flexible joint cast iron pipe and flexible anti-seismic cast iron pipe: The appendix is selected so that readers can understand the design, construction and other contents of the ductile iron pipe. This book can be used for the manufacture and application of ductile iron pipe in the field of scientific research personnel, designers, production personnel, construction personnel, management personnel to read.

Q: Are ductile iron pipes suitable for irrigation systems in agricultural fields?: Yes, ductile iron pipes are suitable for irrigation systems in agricultural fields. Ductile iron pipes have excellent strength, durability, and corrosion resistance, making them ideal for carrying water in irrigation systems. They can withstand high pressure and heavy loads, ensuring reliable water supply to agricultural fields for irrigation purposes.

Q: How does ductile iron pipe perform in seismic areas?: Ductile iron pipe performs well in seismic areas due to its inherent strength and flexibility. Its ability to withstand ground movement and vibrations makes it a reliable choice for underground infrastructure in regions prone to earthquakes. Additionally, its robust construction and high resistance to corrosion and damage ensure its durability and safety even in seismically active zones.

Q: What are the environmental benefits of using ductile iron pipe?: There are several environmental benefits associated with using ductile iron pipe in various applications. Firstly, ductile iron is a highly durable material that can withstand harsh environmental conditions and has a long lifespan. This means that ductile iron pipes require less frequent replacements compared to other pipe materials, reducing the need for resource-intensive manufacturing processes and minimizing the disposal of old pipes. Secondly, ductile iron pipes have excellent corrosion resistance properties, which reduces the risk of leaks and pipe failures. This not only prevents potential water contamination but also minimizes the wastage of water resources. Additionally, ductile iron is a recyclable material. At the end of its useful life, ductile iron pipes can be melted down and used to manufacture new products, reducing the demand for virgin materials and conserving natural resources. Furthermore, the manufacturing process of ductile iron pipe has improved significantly over the years, resulting in reduced energy consumption and emissions. Today, many manufacturers use energy-efficient technologies and practices to produce ductile iron pipes, contributing to a lower carbon footprint and reduced air pollution. Lastly, ductile iron pipes have a smooth internal surface that minimizes friction and allows for efficient water flow. This can lead to energy savings in pumping and distribution systems, as less energy is required to transport water through the pipeline network. Overall, using ductile iron pipe can have a positive impact on the environment by reducing waste, conserving resources, minimizing pollution, and improving energy efficiency in water distribution systems.

Q: What are the typical joint restraint requirements for ductile iron pipes under pressure?: The typical joint restraint requirements for ductile iron pipes under pressure involve the use of mechanical joint restraints or restrained joint systems. These restraints are necessary to prevent the pipes from separating or pulling apart due to the internal pressure exerted on them. One common type of joint restraint is the mechanical joint restraint, which consists of a series of bolts and clamps that securely hold the pipes together. These restraints are typically applied at each joint of the ductile iron pipes to ensure a tight and secure connection. Mechanical joint restraints provide axial restraint, preventing the pipes from separating in the direction of the pipe axis. Another type of joint restraint used for ductile iron pipes is the restrained joint system. This system involves the use of a specially designed joint that provides both axial and angular restraint. The restrained joint system typically consists of a gasket, a restraining gland, and a series of bolts or wedges. The gasket provides a watertight seal, while the restraining gland and bolts/wedges restrain the pipe joints, preventing separation under pressure. The specific joint restraint requirements for ductile iron pipes under pressure may vary depending on the diameter, wall thickness, and operating conditions of the pipes. It is important to consult the manufacturer's guidelines and industry standards to determine the appropriate joint restraint system for a given application. Additionally, proper installation and maintenance of the joint restraints are crucial to ensure their effectiveness and longevity in restraining the pipes.

Q: Can ductile iron pipes be used in marine environments?: Ductile iron pipes are suitable for marine environments due to their excellent mechanical properties, high corrosion resistance, and durability. These pipes are made of a type of cast iron known as ductile iron, which can withstand the harsh conditions of marine environments. Marine environments are known for their high levels of corrosion caused by saltwater, humidity, and other harsh factors. However, ductile iron pipes are specifically designed to endure these conditions. They have a protective layer called the "graphite skin" that acts as a barrier against corrosion. This graphite skin prevents rust formation and safeguards the pipes from degradation. Additionally, ductile iron pipes can be further protected with coatings or linings to enhance their corrosion resistance in marine environments. These protective coatings, such as epoxy, polyurethane, or zinc coatings, provide an extra layer of defense against corrosion. This ensures the pipes' longevity and reliability in marine environments. To maintain optimal performance, regular maintenance and inspection are crucial for ductile iron pipes in marine environments. This includes regular cleaning to remove marine growth or debris that may accumulate on the pipes and conducting routine inspections to identify any signs of corrosion or damage. In conclusion, ductile iron pipes are a suitable choice for marine environments. Their inherent corrosion resistance, durability, and the ability to apply additional protective coatings make them ideal for various marine applications.

Q: What is the minimum cover requirement for ductile iron pipes?: The minimum cover requirement for ductile iron pipes is typically determined by the specific project or engineering design considerations. However, as a general guideline, the minimum cover requirement for ductile iron pipes is often recommended to be at least 2 feet (or 0.6 meters) from the top of the pipe to the finished ground surface. This minimum cover requirement helps to provide adequate protection to the pipe from external loads, soil settlement, and potential damage from construction activities. It also helps to maintain the structural integrity and longevity of the ductile iron pipe system. It is important to note that local building codes, industry standards, and project specifications may dictate specific minimum cover requirements, so it is crucial to consult these resources for accurate and up-to-date information.