DUCTILE IRON PIPES C Class DN1100 System 1

DUCTILE IRON PIPES C Class DN1100

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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 in acidic environments?: Yes, ductile iron pipes can be used in acidic environments. Ductile iron pipes have a high resistance to corrosion, making them suitable for various applications including acidic environments. The high carbon content in ductile iron pipes creates a protective layer on the surface of the pipe, preventing the acid from directly attacking the iron. Additionally, the inner lining of the pipe can be coated with epoxy or other protective materials to further enhance its resistance to corrosion in acidic conditions. However, it is important to consider the specific concentration and type of acid present in the environment, as certain acids may still cause corrosion over time. Consulting with experts or manufacturers is recommended to ensure appropriate material selection for specific acidic environments.

Q:Does centrifugal cast iron pipe work well with lining cement? Will it scale and breed bacteria?: The situation in use abroad seems. It is considered that the corrosion of the inner wall of the centrifugal centrifugal ductile iron pipe and the rupture of the pipe are easy to occur when the content of chloride ion exceeds 5O0PPm in the pipe laying environment. This is mainly because, because the cement paste protection layer is the late spraying construction, it is not good to combine with the prefabricated core tube. It often causes water or moisture to seep in and causes oxidation and corrosion of the prestressing steel bars, resulting in fracture. The adhesive interface between cement mortar and centrifugally cast iron pipe is not reasonable. Because of the water absorption of cement, when the water enters the pipe, it is easy to destroy the interface and corroded the inner wall of the centrifugally cast iron pipe. Because it is a brittle material, it is easy to cause sudden accidents.

Q:Are ductile iron pipes suitable for use in food processing plants?: Ductile iron pipes are indeed suitable for use in food processing plants due to their numerous advantageous qualities. Firstly, they possess immense strength and durability, enabling them to withstand high-pressure situations. This feature proves crucial in food processing plants where pipes encounter diverse pressures during liquid and slurry transportation. Moreover, ductile iron pipes exhibit exceptional resistance to corrosion. This attribute becomes paramount in food processing plants as the pipes come into contact with various types of food, beverages, and cleaning agents, which can gradually corrode them. The corrosion resistance of ductile iron pipes ensures the pipes' integrity and safeguards the food products from contamination. Furthermore, these pipes display remarkable resistance to temperature fluctuations, rendering them suitable for the extreme temperature conditions often present in food processing plants. They can endure both hot and cold fluids without compromising their structural integrity. Additionally, ductile iron pipes possess a smooth inner surface, contributing to the maintenance of food product quality and purity. The smooth interior minimizes deposits like scaling or biofilm, thereby reducing the risk of bacterial growth. This quality proves essential in food processing plants where maintaining a hygienic environment is of utmost importance. Lastly, ductile iron pipes are easy to install and maintain. They boast a lengthy service life and require minimal upkeep, thereby minimizing downtime and associated costs in food processing plants. Considering these factors, ductile iron pipes emerge as a reliable and suitable choice for use in food processing plants. They ensure the safe and efficient transportation of fluids while meeting the industry's stringent hygiene and quality requirements.

Q:What is the external coating used in ductile iron pipes?: Ductile iron pipes usually have an external coating made of protective materials like zinc or asphalt. These coatings are applied to the pipe's surface to prevent corrosion and shield the iron from its surroundings. Zinc coatings, like hot-dip galvanizing, are widely employed because of their exceptional resistance to corrosion. Conversely, asphalt coatings offer a resilient and adaptable shield against corrosion and abrasion. The selection of the coating relies on factors such as the intended use, environmental circumstances, and project-specific requirements.

Q:Can ductile iron pipe be recycled?: Indeed, the recycling of ductile iron pipe is possible. Ductile iron, a variant of iron often employed in pipe production owing to its remarkable robustness and endurance, can be melted down when it reaches the conclusion of its productive lifespan. By utilizing the resultant molten iron, fresh items can be fashioned. This method of recycling not only aids in the preservation of precious natural resources but also lessens the necessity for raw materials and energy-intensive procedures utilized in the fabrication of novel pipes. Furthermore, the recycling of ductile iron pipe serves to diminish waste and contributes to a more sustainable and ecologically conscious approach to the advancement of infrastructure.

Q:Are there any specific standards or specifications for ductile iron pipes?: Ductile iron pipes have specific standards and specifications that must be adhered to. The American Water Works Association (AWWA) and the International Organization for Standardization (ISO) are responsible for establishing the most commonly used standards for these pipes. AWWA has developed the AWWA C151 standard, which covers everything from design and manufacturing to testing, installation, and maintenance requirements for ductile iron pipes used in water and wastewater applications. This standard outlines the materials, dimensions, and mechanical properties of the pipes, as well as the necessary coatings and linings. Similarly, ISO has created the ISO 2531 standard, which provides guidelines for the design, manufacturing, testing, and installation of ductile iron pipes in water and wastewater systems. This standard addresses various aspects, including dimensions, mechanical properties, coatings, and linings. In addition to these well-known standards, there may be other regional or national standards that are specific to certain countries or regions. These standards typically align with the AWWA and ISO standards or may have additional requirements that are specific to local conditions or regulations. Compliance with these standards ensures that ductile iron pipes meet the required quality and performance standards. It also promotes the interoperability and compatibility of ductile iron pipes across different systems and countries, which in turn enables reliable and efficient water distribution and wastewater management.

Q:How is ductile iron pipe different from cast iron pipe?: Ductile iron pipe and cast iron pipe are commonly used in plumbing and drainage applications, but they have differences in composition, strength, and flexibility. To begin with, ductile iron pipe is made from a different iron alloy than cast iron pipe. Ductile iron contains more carbon and silicon, which gives it increased strength and durability. On the other hand, cast iron pipe is made from gray iron, which has higher carbon content but lacks the flexibility of ductile iron. Moreover, ductile iron pipe is renowned for its superior strength and resistance to impact. It can withstand higher pressures and is less likely to crack or break under heavy loads or external forces. Cast iron pipe, although strong, is more brittle and prone to fractures and failures. Another significant distinction is the flexibility of ductile iron pipe. It possesses greater flexibility and can endure bending and deformation without fracturing. This flexibility facilitates easier installation, particularly in areas with uneven terrain or where ground movement may occur. In contrast, cast iron pipe is less flexible and more rigid, making it unsuitable for applications that require flexibility. Additionally, ductile iron pipe has a smoother interior surface compared to cast iron pipe. This smoothness reduces friction, enhances flow efficiency, and minimizes the accumulation of sediment and deposits within the pipe, resulting in improved water flow and reduced maintenance needs. In conclusion, ductile iron pipe sets itself apart from cast iron pipe due to its composition, strength, flexibility, and smooth interior surface. Ductile iron offers superior strength, impact resistance, and flexibility, making it the preferred choice in various plumbing and drainage applications.

Q:What are the lubricants for the installation of ductile iron pipes for tap water?: The lubricant can also be used for cooling, cleaning and preventing pollution. In order to improve lubricity, suitable additives may be added to certain lubricants.

Q:Can ductile iron pipes be repaired if damaged?: Yes, ductile iron pipes can be repaired if they are damaged. The repair process involves several steps. Firstly, the damaged section of the pipe needs to be identified and isolated. Once that is done, the damaged portion of the pipe is typically cut out and removed. A new section of pipe is then inserted and connected to the existing pipeline using appropriate methods such as welding or mechanical jointing. The repaired section is then tested to ensure its integrity and functionality. It is worth noting that the repair process may vary depending on the extent and nature of the damage, and it is always recommended to consult with professionals who specialize in ductile iron pipe repairs to ensure proper and effective restoration.

Q:What effect does magnesium play in nodular cast iron?: Magnesium can be graphite precipitated in spherical form.But the specific mechanism is not clear, and now it is still debated in the academic circles.In addition, magnesium and sulfur generate MgS, which removes S from molten iron, which impedes the formation of spheroidal graphite.Therefore, Mg has two functions to eliminate the influence of S on Nodular Iron and promote the precipitation of graphite in spherical form.

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