DUCTILE IRON PIPES C Class DN350

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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?: From the centrifugal ductile cast iron pipe with cement production process to analysis, the most core pipe by centrifugal molding, concrete water cement ratio, the centrifugal force, the coarse aggregate to the outer wall of the pipe and the pipe inside; because of fine aggregate and water removal, strength and wear resistance variation. When the inner wall of the pipe by long-term washing and soaking water, and inner wall wear and erosion, as the roughness increases, head loss increases, you will need to increase the pump lift, and operation cost for power consumption increases, also greatly increased.

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:Method for cutting cast iron pipe: Depends on the material and the use of requirements. Ordinary gray iron, if the incision is not strict, such as water pipes. They are all sheared with hydraulic cutting machine, but the incision will not be very smooth. If it is ductile iron, and the incision requirements are high, it can only be used plasma cutting machine. General fittings, if not specifically required, shall not be cut by machining methods.

Q:What are the risks in the process of conveying ductile iron pipes?: Pile up: when the pipe is stacked, the lower part of the pipe should be covered with a tie or cushion block. The socket of the pipe is interlocked with each other, and the stop wedge must be put in place to prevent the pipe from rolling. Not allowed to be piled on marshes, rough slopes, or badly polluted areas.

Q:Are ductile iron pipes resistant to biological growth?: Yes, ductile iron pipes are generally resistant to biological growth. The smooth interior surface of ductile iron pipes prevents the buildup of biofilm and inhibits the growth of bacteria and other organisms. Additionally, the material itself is not conducive to the growth of biological contaminants, making ductile iron pipes a reliable choice for water and wastewater applications.

Q:What is a slide in type T flexible interface?: As long as the socket is inserted into the slot, the installation is quick, labor-saving and airtight, and what is good is also good

Q:How do ductile iron pipes perform in seismic zones?: Ductile iron pipes perform well in seismic zones due to their inherent strength and flexibility. They are capable of withstanding ground movements and vibrations during seismic events without fracturing or breaking. The ductility of the material allows the pipes to absorb and distribute the seismic energy, reducing the risk of damage or failure. Additionally, their joint design and installation techniques ensure stability and integrity, further enhancing their performance in seismic zones.

Q:What are the different types of valves available for ductile iron pipe?: There are several different types of valves available for ductile iron pipe, each serving a specific purpose and function. Some of the most common types of valves used with ductile iron pipe include: 1. Gate Valves: These valves are used to either completely open or close the flow of fluid within the pipe. They have a gate-like mechanism that either blocks or allows the passage of fluid when the valve is either fully open or fully closed. 2. Butterfly Valves: Butterfly valves are quarter-turn valves that use a circular disc as the closing mechanism. When the valve is open, the disc is parallel to the flow, allowing for minimal pressure drop. When the valve is closed, the disc is perpendicular to the flow, completely stopping the fluid. 3. Ball Valves: Ball valves have a spherical disc with a hole in the middle, known as a ball. When the valve is open, the ball is positioned in such a way that it allows fluid to flow through the hole. When the valve is closed, the ball is rotated to block the flow. 4. Check Valves: Check valves are designed to allow fluid to flow in one direction only, preventing backflow. They have a flap or a disc that opens when the flow is in the correct direction, and closes to stop the flow when it tries to reverse. 5. Plug Valves: Plug valves have a cylindrical or conical plug with a hole through it that can be rotated to control the flow. When the valve is open, the hole aligns with the pipe, allowing fluid to pass through. When the valve is closed, the hole is perpendicular to the pipe, blocking the flow. 6. Pressure Reducing Valves: These valves are used to control and reduce the pressure of fluid flowing through the pipe. They have a mechanism that adjusts the flow area, allowing for pressure reduction. 7. Pressure Sustaining Valves: Pressure sustaining valves are used to maintain a specific pressure within the pipe. They automatically adjust the flow area to sustain the desired pressure level. 8. Air Release Valves: Air release valves are used to release air trapped within the pipe. They allow air to escape while preventing fluid from leaking out. These are just a few examples of the different types of valves available for ductile iron pipe. The choice of valve depends on the specific application, flow requirements, and desired functionality.

Q:How can 4 inch ductile iron pipe be connected with 2 inch galvanized pipe?: The hot dip galvanized welded steel pipe galvanized pipe, galvanized pipe by welding without taking anti rusting measures (furnace welding and welding) steel pipe, seamless steel pipe or other metal pipe of the clarinet, process of hot dip galvanizing, the outer coating and galvanized layer to long-term corrosion of the steel pipe after processing.

Q:What is the expected hydraulic performance of ductile iron pipes?: Ductile iron pipes are known for their exceptional hydraulic performance, boasting a remarkably smooth inner surface that facilitates fluid flow, resulting in reduced friction losses and increased flow rates. With excellent resistance to corrosion and abrasion, these pipes demonstrate long-lasting efficacy in diverse water and wastewater applications. In addition, the high tensile strength of ductile iron pipes enables them to withstand substantial internal and external loads without any deformation or failure. Their versatility allows for usage in both above-ground and below-ground scenarios, encompassing water distribution systems, sewage and wastewater transport, industrial piping, and irrigation systems. Moreover, the flexibility and resilience of ductile iron pipes enable them to adapt to ground movement and settle without any risk of breakage. This attribute proves invaluable in areas with unstable soil conditions or seismic activity, making these pipes a dependable choice. Overall, the hydraulic performance of ductile iron pipes is characterized by efficient flow, minimal pressure losses, durability, and the capacity to withstand various external forces. These exceptional qualities establish them as a favored option for water infrastructure projects, ensuring reliable and efficient fluid transportation over a prolonged service life.

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