DUCTILE IRON PIPES C Class DN300

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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 seawater intake systems?: Seawater intake systems can utilize ductile iron pipes, which are a type of cast iron renowned for their strength, durability, and corrosion resistance. These properties render them suitable for various applications, including seawater intake systems. The high salt content of seawater makes it highly corrosive, posing a threat to regular cast iron pipes that may suffer from corrosion and damage over time. However, ductile iron pipes possess a protective coating acting as a corrosion barrier, enabling them to endure the harsh conditions of seawater. Furthermore, compared to regular cast iron pipes, ductile iron pipes exhibit superior tensile strength, enhancing their resistance to the intense pressures and stresses associated with seawater intake systems. As a result, ductile iron pipes offer a dependable and cost-effective option for seawater intake systems.

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 railway bridges?: Indeed, railway bridges can utilize ductile iron pipes. Ductile iron, a resilient and sturdy form of cast iron, possesses remarkable tensile strength and flexibility. These characteristics render it suitable for a wide array of uses, railway bridges included. Ductile iron pipes serve as ideal building materials for various railway bridge elements, such as supports, beams, and columns, providing not only structural stability but also the ability to endure substantial loads and vibrations associated with railway traffic. Moreover, ductile iron pipes exhibit resistance to corrosion, a vital attribute for railway bridges that face exposure to outdoor conditions. Consequently, ductile iron pipes represent a viable and effective choice for constructing railway bridges.

Q: What is the expected joint flexibility of ductile iron pipes?: The expected joint flexibility of ductile iron pipes is typically high due to their inherent material properties. Ductile iron is known for its excellent ductility, which refers to its ability to deform without fracturing. This characteristic allows ductile iron pipes to withstand external loads, ground movement, and pressure fluctuations without major damage. The joints in ductile iron pipes are typically designed to provide additional flexibility and accommodate movement. The most common joint type used in ductile iron pipes is the push-on joint, which allows for angular deflection and axial movement. These joints consist of a rubber gasket that creates a watertight seal and allows for slight movement between pipe sections. The expected joint flexibility depends on various factors, including the pipe diameter, joint type, and installation methods. Generally, ductile iron pipes can accommodate angular deflection up to a certain degree, typically ranging from 5 to 10 degrees, depending on the joint design. Axial movement can also be accommodated to some extent, allowing for expansion and contraction of the pipe system. It is important to note that joint flexibility may vary depending on the specific manufacturer and product specifications. Therefore, it is recommended to consult the manufacturer's guidelines and specifications for the expected joint flexibility of a particular ductile iron pipe product.

Q: Can ductile iron pipes be used in areas with high groundwater levels?: Indeed, areas with high groundwater levels can accommodate the use of ductile iron pipes. Renowned for their robustness, endurance, and anti-corrosion properties, these pipes prove themselves suitable for diverse purposes, such as water supply systems. Their structural integrity remains intact even when confronted with elevated groundwater levels. Additionally, the smooth interior surface of ductile iron pipes aids in sustaining optimal flow capacity while minimizing the likelihood of blockages or sediment accumulation. Thus, they offer a dependable option for regions with considerable groundwater levels, ensuring a durable and effective resolution for water distribution systems.

Q: What are the typical joint sealing requirements for ductile iron pipes under pressure?: The typical joint sealing requirements for ductile iron pipes under pressure include the use of rubber gaskets and mechanical joints. These joints are designed to provide a watertight seal and prevent any leakage or seepage of the pressurized fluid. Additionally, proper cleaning and lubrication of the joints before assembly is crucial to ensure a secure and effective seal. Regular inspection and maintenance are also necessary to identify and address any potential joint sealing issues.

Q: If the ductile iron pipe is broken, can we use rush repair?: In this way, manpower, material resources and financial resources can be saved, time can be saved, and unnecessary troubles to the citizens' water supply can also be reduced.

Q: How are ductile iron pipes different from other types of pipes?: Ductile iron pipes are different from other types of pipes primarily due to their enhanced strength and durability. Unlike traditional cast iron pipes, ductile iron pipes have a higher tensile strength and can withstand higher internal and external pressures. They are also less prone to cracking or breaking under heavy loads or impact, making them suitable for both above-ground and underground applications. Additionally, ductile iron pipes offer superior resistance to corrosion, which increases their lifespan and reduces maintenance requirements compared to other pipe materials.

Q: Method for cutting large diameter ductile iron pipe: When the ratio of oxygen to acetylene is 1 to 1.2, the flame produced is called neutral flame, also known as normal flame. It consists of flame core, inner and outer flame: near the welding nozzle at the flame core, a bright white; followed by the flame, a blue purple, the highest temperature, about 3150 DEG C, from the front cone at 2 ~ 4mm, and the application of welding wire to the workpiece; the outer flame is orange red. Neutral flame is a flame commonly used in welding. It is used to weld low carbon steel, medium carbon steel, alloy steel, copper and aluminum alloy.

Q: Are ductile iron pipes resistant to frost heave?: Generally considered resistant to frost heave, ductile iron pipes can withstand the expansion and lifting of surrounding soil caused by freezing water in the ground. Their high tensile strength and flexibility prevent cracking or breaking under the forces exerted by frost heave. Moreover, ductile iron pipes have a high resistance to impact and can handle significant external loads, making them ideal for areas with freezing temperatures and potential frost heave. Additionally, the joints in these pipes are designed to tightly seal and prevent water infiltration, reducing the risk of freezing and subsequent frost heave. However, it is important to note that while ductile iron pipes are resistant to frost heave, they are not completely immune. Extreme temperature fluctuations, prolonged freezing conditions, or inadequate insulation can still jeopardize their integrity. Therefore, proper installation techniques, including using appropriate bedding and backfilling materials, thermal insulation, and regular maintenance, are crucial to ensure long-term performance and resistance to frost heave.

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