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: Are ductile iron pipes suitable for fire protection systems?: Yes, ductile iron pipes are suitable for fire protection systems. Ductile iron is a strong and durable material that can withstand high pressure and temperature fluctuations, making it ideal for fire protection systems that require reliable and long-lasting pipes. Additionally, ductile iron has excellent corrosion resistance, which helps to prevent the degradation of the pipes over time, ensuring the integrity of the fire protection system. The high tensile strength of ductile iron also provides added safety benefits as it can withstand the stress and strain that may occur during a fire event. Therefore, ductile iron pipes are a suitable and commonly used material for fire protection systems in various applications, including commercial buildings, industrial facilities, and residential areas.

Q: How are ductile iron pipes protected against interior corrosion?: Cement mortar lining is utilized to protect ductile iron pipes against interior corrosion. This process involves the application of a layer of cement mortar to the inner surface of the pipe. By acting as a protective barrier, the cement mortar prevents the corrosive elements in the water or fluid from directly contacting the iron material. To apply the cement mortar lining, the interior surface of the ductile iron pipe is initially prepared by removing any loose scale or debris. Next, a mixture of cement, sand, and water is prepared to create a paste-like consistency. Skilled workers can then manually apply this mixture to the interior surface of the pipe or use a spinning machine. Once the cement mortar lining is applied, it must cure for a specific period, typically around 24 hours. During this curing process, the cement mortar hardens and forms a dense protective layer on the pipe's inner surface. The cement mortar lining provides several advantages in safeguarding ductile iron pipes against corrosion. It creates a smooth and continuous surface that prevents direct contact between the water or fluid and the iron material, thus reducing the risk of corrosion. Additionally, the lining helps to minimize friction within the pipe, thereby enhancing flow efficiency. It is crucial to regularly inspect and maintain the cement mortar lining to ensure its effectiveness in preventing corrosion. Over time, the lining may develop cracks or deteriorate, compromising its protective properties. Therefore, periodic inspections are necessary to repair or replace the lining as required, ensuring the integrity of the ductile iron pipes and preventing interior corrosion.

Q: Can ductile iron pipes be used for both water and sewage systems?: Ductile iron pipes can serve for both water and sewage systems, owing to their remarkable strength and durability. Renowned for their exceptional mechanical properties, these pipes can endure the immense pressure and stress encountered in such systems. Furthermore, their resistance to corrosion renders them optimal for transporting both clean water and sewage. Consequently, ductile iron pipes emerge as a dependable and adaptable option for water and sewage systems, given their wide-ranging applications.

Q: Can ductile iron pipes be used for underground drainage systems?: Yes, ductile iron pipes can be used for underground drainage systems. Ductile iron pipes have high tensile strength and durability, making them suitable for withstanding the external pressures and loads associated with underground applications. They are also resistant to corrosion and have a long lifespan, making them a reliable choice for drainage systems.

Q: What's the function of the cement mortar lining of ductile iron pipes?: In brief, the cement mortar lining system has the following advantages:1. provide active protection better than barrier coating2. meet both national and international standards for contact with potable water3. can be used in the strict requirements of the occasion4. strong and shock resistant5. suitable for a wide range of applications6. easy to repair7. over 100 years of service life

Q: Are ductile iron pipes more expensive than other pipe materials?: The cost of ductile iron pipes may be higher than some other pipe materials, depending on various factors. Ductile iron pipes are renowned for their durability, strength, and resistance to corrosion, making them a wise long-term investment. However, compared to materials such as PVC or HDPE, the initial cost of ductile iron pipes can be higher. Furthermore, the installation process of ductile iron pipes may necessitate more labor and specialized equipment, thereby increasing the overall expense. Nevertheless, it is crucial to consider specific project requirements, including the environment, expected lifespan, and required pressure ratings, in order to accurately assess the cost-effectiveness of ductile iron pipes in relation to other pipe materials.

Q: How can the cast iron pipe of the ductile iron pipe be repaired?: If it is ductile cast iron pipe, then use the plugging device can be used in the mouth of the big head plugging device, then use ordinary plugging device, if it is bent, we need on-site survey to do plugging device

Q: How does ductile iron pipe handle ground movement and settlement?: Ductile iron pipe is known for its excellent ability to handle ground movement and settlement. Due to its inherent strength and flexibility, it can withstand significant ground shifts without experiencing major damage or failure. One of the key features of ductile iron pipe is its high tensile strength, which allows it to withstand external forces and pressures. This strength enables the pipe to resist the effects of ground movement, such as soil settlement, subsidence, or shifting due to seismic activity. Moreover, ductile iron pipe has inherent flexibility, which allows it to absorb and distribute stress caused by ground movement. The pipe's flexibility helps to minimize the impact of settlement by allowing it to adjust and adapt to changes in the surrounding soil. This characteristic helps prevent the pipe from cracking, breaking, or leaking when the ground shifts or settles. Additionally, ductile iron pipes are often installed with flexible joints, such as push-on or mechanical joints, which further enhance their ability to accommodate ground movement. These joints provide a degree of flexibility and movement, allowing the pipe to adjust to changes in the soil without experiencing stress concentrations or structural failure. Furthermore, ductile iron pipe is highly resistant to corrosion, which is another important factor in its ability to handle ground movement and settlement. Corrosion can weaken pipes and make them more susceptible to damage during ground shifts. However, the corrosion-resistant properties of ductile iron help maintain the pipe's structural integrity and durability, even in challenging soil conditions. In summary, ductile iron pipe is well-suited to handle ground movement and settlement due to its high tensile strength, flexibility, and corrosion resistance. These properties allow the pipe to withstand external forces and adapt to changes in the surrounding soil, minimizing the risk of damage, leaks, or failure.

Q: Are ductile iron pipes resistant to UV radiation?: No, ductile iron pipes are not resistant to UV radiation. UV radiation can cause degradation and weakening of the material over time. To protect ductile iron pipes from UV radiation, they should be coated or wrapped with a UV-resistant material or painted with a suitable protective coating. Additionally, proper maintenance and regular inspections should be carried out to detect and address any signs of UV damage.

Q: What is the expected leakage rate of ductile iron pipes?: The leakage rate of ductile iron pipes can vary depending on several factors, including pipe age, condition, installation quality, and external influences on pipe integrity. However, in comparison to other pipe types, ductile iron pipes are renowned for their durability and low leakage rates. Based on industry standards and studies, well-maintained and correctly installed ductile iron pipes typically have an expected leakage rate of less than 0.5 liters per pipe per day (LPPD). This leakage rate meets the requirements set by regulatory bodies and organizations, and is considered acceptable. It is crucial to emphasize that regular maintenance and inspections are vital in sustaining the low leakage rate of ductile iron pipes. Prompt identification and repair of potential leaks or damages can effectively minimize the overall leakage rate. Moreover, advancements in manufacturing techniques and pipe design have led to the creation of more leak-resistant ductile iron pipes. These pipes may have even lower expected leakage rates than the industry average, further improving their performance and reliability. Ultimately, when properly installed and maintained, ductile iron pipes are a reliable choice for various water distribution and transmission systems, as their expected leakage rate is generally low.

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