• DUCTILE IRON PIPE C Class DN100 System 1
  • DUCTILE IRON PIPE C Class DN100 System 2
DUCTILE IRON PIPE C Class DN100

DUCTILE IRON PIPE C Class DN100

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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:What are the different types of thrust restraints for ductile iron pipe?
There are several different types of thrust restraints that can be used for ductile iron pipe installations. These thrust restraints are designed to prevent the pipe from moving or separating under the forces generated by internal pressure, external loads, or changes in temperature. 1. Thrust blocks: Thrust blocks are concrete structures that are typically installed at bends, tees, and other changes in direction in the pipeline. They are designed to resist the thrust forces by transferring them to the surrounding soil or foundation. 2. Mechanical restraints: Mechanical restraints, such as tie rods or harnesses, are used to restrain the pipe by exerting an external force on it. These restraints are typically made of steel and can be adjusted to accommodate changes in pipe length or alignment. 3. Pipe anchors: Pipe anchors are devices that are installed at specific intervals along the pipeline to provide resistance against axial movement. They are usually made of steel and are embedded into the surrounding soil or concrete to provide a secure anchor point for the pipe. 4. Thrust collars: Thrust collars are devices that are installed around the pipe to prevent it from moving or separating. They are typically made of steel and are placed at strategic locations along the pipeline to absorb the thrust forces. 5. Restrained joint systems: Restrained joint systems are specialized pipe joints that are designed to resist axial forces. These joints typically have additional features, such as keyways or wedges, that provide resistance against movement. It is important to select the appropriate type of thrust restraint based on the specific requirements of the ductile iron pipe installation. Factors such as the pipe diameter, operating pressure, soil conditions, and potential external loads should be considered when determining the most suitable thrust restraint system. Consulting with a qualified engineer or pipe manufacturer can help ensure the proper selection and installation of thrust restraints for ductile iron pipe.
Q:What are the different coating thickness options for ductile iron pipe?
The coating thickness options for ductile iron pipe can vary depending on the specific application and requirements. Generally, there are three common coating thickness options for ductile iron pipe: 1. Standard Thickness: The standard coating thickness for ductile iron pipe is usually between 200 and 250 microns (8-10 mils). This thickness provides adequate protection against corrosion and abrasion in most soil and water environments. 2. Increased Thickness: In some cases, where the pipe is exposed to more aggressive environments or requires a longer service life, an increased coating thickness may be necessary. This can range from 300 to 500 microns (12-20 mils) or even more, depending on the specific requirements. 3. Specialized Coatings: For particularly demanding applications, specialized coatings may be used. These coatings can provide even higher levels of protection against corrosion, abrasion, or chemical exposure. The thickness of these specialized coatings can vary significantly depending on the specific coating material and application requirements. It is important to note that the selection of coating thickness should be based on a thorough assessment of the environmental conditions, intended service life, and any applicable industry standards or specifications. Consulting with a coating manufacturer or a corrosion specialist is recommended to determine the appropriate coating thickness for a specific ductile iron pipe application.
Q:Can ductile iron pipe be used for water treatment plant applications?
Yes, ductile iron pipe can be used for water treatment plant applications. Ductile iron pipe is known for its durability, strength, and corrosion resistance, making it suitable for transporting and distributing treated water within a water treatment plant.
Q:How does ductile iron pipe perform in areas with high soil stability?
Ductile iron pipe performs exceptionally well in areas with high soil stability. Its robust and durable nature allows it to withstand the pressures exerted by the stable soil, ensuring a reliable and long-lasting performance. Additionally, the flexibility of ductile iron allows it to accommodate ground movements and settlement without compromising its integrity. Overall, ductile iron pipe is a suitable choice for areas with high soil stability, providing efficient and dependable water distribution and sewerage systems.
Q:How is ductile iron pipe tested for quality?
Ductile iron pipe is tested for quality through various methods, including visual inspection, hydrostatic pressure testing, and mechanical property testing. Visual inspection ensures that the pipe is free from any visible defects or imperfections. Hydrostatic pressure testing involves subjecting the pipe to water pressure that exceeds its maximum working pressure to check for any leaks or failures. Mechanical property testing assesses the pipe's strength, toughness, and other mechanical properties through tests such as tensile strength, yield strength, and elongation. These quality tests help ensure that ductile iron pipes meet the required standards and are suitable for their intended applications.
Q:What are the different types of fittings available for ductile iron pipe?
Ductile iron pipe offers a variety of fittings to accommodate different plumbing or piping systems. These fittings come in various configurations to connect, redirect, or branch off the pipe. One frequently used fitting is the flanged fitting, which has a flange or lip on one end for easy bolted connection to another flanged component. Flanged fittings are ideal for applications requiring a tight seal, such as water or sewage systems. Another option is the mechanical joint fitting, which utilizes a gasket and mechanical bolts to securely connect two pipe pieces. This type of fitting is often employed in underground water or sewer systems. Push-on fittings are also popular for ductile iron pipe. These fittings have a rubber gasket that is compressed onto the pipe, ensuring a watertight seal. They are quick and easy to install, making them perfect for applications where speed and efficiency are crucial. When a change in direction is necessary, ductile iron pipe fittings like elbows or bends are utilized. These fittings smoothly alter the pipe's direction without causing significant flow restrictions. Furthermore, saddle fittings are available for ductile iron pipe. These fittings create a branch connection on an existing pipeline without the need for cutting or welding. They are commonly used in irrigation or fire protection systems. In conclusion, the range of fittings for ductile iron pipe provides options to meet the specific requirements of different plumbing or piping systems. Whether it's flanged fittings for a tight seal, mechanical joint fittings for underground applications, push-on fittings for quick installation, or specialized fittings like elbows or saddle fittings, each type serves a specific purpose within the overall plumbing or piping system.
Q:How are ductile iron pipes protected against external soil loads?
Several methods are employed to protect ductile iron pipes from external soil loads. An important approach involves applying a protective coating to the exterior surface of the pipe, which acts as a barrier between the iron and the surrounding soil. This coating effectively prevents direct contact and reduces the risk of corrosion. Another means of safeguarding the pipes is by utilizing carefully selected trench backfill materials. These materials are compacted and chosen with great care to provide adequate support and distribute the load evenly on the pipe. By doing so, the stress and pressure exerted by the surrounding soil are minimized. Moreover, the design and installation of the pipe system play a crucial role in protecting against external soil loads. Typically, the pipes are laid in a meticulously engineered trench that incorporates appropriate bedding and backfilling techniques. This ensures stability and minimizes the potential for damage. Additionally, proper pipe jointing techniques are essential for protection against external soil loads. The joints are often designed to be flexible, allowing for some movement and accommodating external loads. This distributes stress along the length of the pipe and prevents concentrated pressure points that could lead to failure. In conclusion, the effective protection of ductile iron pipes against external soil loads is achieved through a combination of protective coatings, appropriate backfill materials, proper installation techniques, and joint design. This guarantees the durability and reliability of the pipe system, even in challenging soil conditions.
Q:How are ductile iron pipes connected?
There are several methods commonly used to connect ductile iron pipes, including flanged joints, mechanical joints, and push-on joints. Flanged joints involve connecting two sections of pipe by using a flanged coupling. The pipe ends have flanges that are securely bolted together, creating a connection that is both strong and leak-proof. This method is often used for pipes with larger diameters or in situations where a rigid joint is necessary. Mechanical joints use a mechanical joint gland and rubber gasket to create a seal that is watertight. The ends of the pipes are inserted into the gland, and then bolts are tightened to compress the gasket, ensuring a reliable connection. This method is frequently employed in water distribution systems because it is flexible and easy to install. Push-on joints utilize a rubber gasket to create a tight seal between sections of pipe. The gasket is placed in a groove on one end of a pipe, and then the other pipe is pushed onto it, resulting in a compression seal. This method is quick and straightforward, making it suitable for a variety of applications, such as sewer systems and underground piping. Ultimately, the choice of connection method for ductile iron pipes depends on factors such as pipe diameter, application requirements, and installation conditions. It is of utmost importance to adhere to the manufacturer's recommendations and industry standards to ensure proper installation and dependable performance.
Q:What are the advantages of using ductile iron pipe?
Using ductile iron pipe in various applications offers several benefits. Firstly, ductile iron pipe is renowned for its strength and durability. It possesses higher tensile and yield strengths compared to other pipe materials, making it highly resistant to cracking, bending, and breaking. This exceptional strength enables the pipe to withstand high-pressure and heavy-load conditions, making it an ideal choice for applications such as water and sewage systems, oil and gas pipelines, and industrial piping. Secondly, ductile iron pipe exhibits excellent corrosion resistance. It is coated with a protective layer, typically zinc or epoxy, which prevents rusting and corrosion. This coating ensures a longer lifespan for the pipe, even in harsh environments or when transporting corrosive fluids. Another advantage of ductile iron pipe lies in its flexibility. Unlike rigid pipes, ductile iron pipes possess a certain level of flexibility, enabling them to endure ground movements and settle without fracturing. This flexibility proves particularly advantageous in areas prone to earthquakes or soil settlements. Additionally, ductile iron pipe boasts a smooth inner surface, minimizing flow resistance and enhancing fluid transportation efficiency. It also reduces the likelihood of sediment accumulation or corrosion within the pipe, resulting in improved flow rates and decreased maintenance requirements. Furthermore, ductile iron pipe proves cost-effective in the long run. Although it may entail higher initial costs compared to other pipe materials, its durability and minimal maintenance needs make it a cost-effective choice over time. The extended lifespan of ductile iron pipe reduces the necessity for frequent replacements and repairs, contributing to lower overall life-cycle expenses. Lastly, ductile iron pipe exhibits environmental friendliness. It is manufactured using recycled materials, and its extended lifespan diminishes the need for frequent replacements, thereby reducing the carbon footprint associated with manufacturing and transportation. In conclusion, the utilization of ductile iron pipe offers numerous advantages, including exceptional strength, corrosion resistance, flexibility, smooth inner surface, cost-effectiveness, and environmental friendliness. These qualities establish it as a reliable and preferred option for various applications across diverse industries.
Q:How are ductile iron pipes protected during transportation and storage?
Ductile iron pipes are typically protected during transportation and storage through various methods. One common practice is to apply a coating of bituminous paint or epoxy on the exterior surface of the pipes to prevent corrosion. Additionally, the pipes are often wrapped with plastic or other protective material to shield them from physical damage and moisture. Proper handling and stacking techniques are also employed to minimize the risk of any deformation or cracking during transportation and storage.

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