DUCTILE IRON PIPES C Class DN150

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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 advantages of using ductile iron pipes?: There are several advantages of using ductile iron pipes. Firstly, they have high tensile strength and durability, making them resistant to cracking and breaking under pressure or external forces. Secondly, ductile iron pipes have excellent corrosion resistance, allowing them to withstand harsh environments and reducing the risk of leaks and pipe failures. Additionally, they provide better flow characteristics due to their smooth internal surface, ensuring efficient transportation of fluids. Lastly, ductile iron pipes have a long lifespan and require minimal maintenance, resulting in cost savings and reliable infrastructure for water supply and wastewater management systems.

Q: What are the different methods for tapping ductile iron pipe?: Tapping ductile iron pipe can be done in several different ways, depending on the project's specific needs. Some commonly used methods include: 1. Mechanical Tapping: To create a hole in the ductile iron pipe, a mechanical tapping machine is employed. Equipped with a rotating cutting tool, the machine easily cuts through the pipe wall, resulting in a clean hole. This method is ideal for smaller diameter pipes and is both quick and efficient. 2. Hot Tapping: While the ductile iron pipe is still in service and under pressure, hot tapping involves creating a hole. To ensure safety and maintain the pipe's integrity, specialized equipment and expertise are required. Hot tapping is commonly used when shutting down the pipeline for maintenance or repair work is impractical or not feasible. 3. Electrofusion Tapping: For larger diameter pipes, electrofusion tapping is a suitable method. It involves using an electrofusion saddle and fitting to create a branch connection on the ductile iron pipe. By welding a fitting onto the pipe with an electrofusion machine, a secure and leak-proof connection is achieved. This method can be used for both water and gas applications. 4. Saddle Tapping: A cost-effective and simple method for smaller diameter pipes is saddle tapping. It involves attaching a saddle or clamp onto the ductile iron pipe and drilling a hole through it. The saddle is then equipped with a threaded outlet to connect a branch line. 5. Split Sleeve Tapping: For larger diameter pipes, split sleeve tapping is commonly used. This method requires cutting a section out of the ductile iron pipe and installing a split sleeve over the cut. By bolting the split sleeve together, a secure and watertight connection is established. It is suitable for both water and gas applications. When selecting the tapping method, it is crucial to consider factors like pipe size, pressure rating, required branch connection, and project-specific requirements. Consulting a professional engineer or tapping specialist is highly recommended to ensure the correct method is used for tapping ductile iron pipe.

Q: Nodular cast iron, heat treatment process and so on: High temperature graphitization annealing was adopted to eliminate the chill, and 900-950 and 2-4H obtained ferrite structure

Q: What is the average diameter range of ductile iron pipes?: The average diameter range of ductile iron pipes is typically between 3 inches to 64 inches.

Q: Are ductile iron pipes suitable for underground applications?: Yes, ductile iron pipes are suitable for underground applications. They are known for their durability, strength, and resistance to corrosion, making them ideal for use in underground environments where they may be exposed to moisture and soil conditions. Additionally, ductile iron pipes have a long lifespan and can withstand heavy loads, making them a reliable choice for underground applications such as water and sewage systems.

Q: How does ductile iron pipe compare to PVC pipe in terms of strength?: Ductile iron pipe is generally stronger than PVC pipe in terms of strength. Ductile iron has a higher tensile strength and can withstand higher pressures and heavier loads compared to PVC, making it suitable for applications that require greater durability and strength.

Q: How are ductile iron pipes protected against stray electrical currents?: Ductile iron pipes, which are commonly used for water and sewer systems, are protected against stray electrical currents through a process known as cathodic protection. This method involves applying a low-voltage direct current (DC) to the pipes, which creates a protective electrical field around them. Cathodic protection is achieved by installing sacrificial anodes or impressed current systems near the ductile iron pipes. Sacrificial anodes, typically made of a more electrically active metal such as zinc or magnesium, are connected to the pipes and serve as the source of electrical current. These anodes corrode over time, sacrificing themselves to protect the pipes from corrosion due to stray electrical currents. Impressed current systems, on the other hand, utilize an external power source to supply the protective electrical current. Rectifiers are used to convert alternating current (AC) to direct current (DC) and the DC is then applied to the pipes through anodes. This method allows for more control over the amount of current being applied, ensuring optimal protection. In both cases, the electrical current flowing through the sacrificial anodes or impressed current systems creates a protective barrier around the ductile iron pipes. This barrier prevents the stray electrical currents from flowing through the pipes, reducing the risk of corrosion and extending the lifespan of the infrastructure. Regular monitoring and maintenance of the cathodic protection system are essential to ensure its effectiveness. This involves inspecting the anodes, checking the electrical current levels, and making any necessary adjustments or replacements to maintain the desired level of protection. Overall, cathodic protection is a reliable and widely used method to protect ductile iron pipes against stray electrical currents, safeguarding the integrity and longevity of water and sewer systems.

Q: What are the advantages of using ductile iron pipe over HDPE pipe?: Ductile iron pipe offers numerous benefits compared to HDPE pipe. Firstly, it is renowned for its exceptional strength and durability. With the ability to withstand higher pressure, it is less prone to leakage or bursting, making it an ideal choice for applications requiring high-pressure water or gas transmission, such as municipal water supply systems or industrial piping networks. Secondly, ductile iron pipe boasts an extended lifespan when compared to HDPE pipe. Its remarkable resistance to corrosion allows it to endure for decades, even in harsh environmental conditions. As a result, frequent replacements are minimized, leading to long-term cost savings. Furthermore, ductile iron pipe exhibits excellent fire resistance properties. It can endure high temperatures without compromising its structural integrity, making it a reliable option for applications where fire safety is a concern, such as fire hydrant systems or sprinkler systems. Additionally, ductile iron pipe is renowned for its superior flow characteristics. Its smooth inner surface reduces friction loss, facilitating efficient and consistent fluid flow. This attribute is particularly crucial in applications that necessitate maximum flow capacity, such as water distribution systems or wastewater treatment plants. Moreover, ductile iron pipe is highly recyclable, promoting environmental sustainability. It can be melted down and utilized to manufacture new pipes, thereby reducing its environmental impact. In conclusion, ductile iron pipe offers a multitude of advantages over HDPE pipe, including its exceptional strength and durability, prolonged lifespan, fire resistance, superior flow characteristics, and recyclability. These features establish ductile iron pipe as the preferred choice for various applications, particularly those that require high-pressure transmission, longevity, fire safety, efficient flow, and environmental sustainability.

Q: How to properly maintain FRP pipes: The wall of the pipe is smoothReduce flow resistance, increase flow speed and reduce energy consumption. Compared with the same size steel pipe, the flow rate of the same volume can be increased by about 10%, and no fouling and long-term use can not reduce the flow rate. The protection of cables in interference and heavy corrosion environment is better.