DUCTILE IRON PIPES K8 DN125

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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 disadvantages of using ductile iron pipe?: There are several disadvantages associated with using ductile iron pipe. Firstly, one major drawback is its cost. Ductile iron pipe tends to be more expensive than other types of piping materials such as PVC or even traditional cast iron. This can make it less appealing for projects with strict budget constraints. Secondly, ductile iron pipe is relatively heavy compared to other materials. This makes it more difficult to handle and install, requiring specialized equipment and additional labor. The weight can also make it more susceptible to damage during transport and installation. Another disadvantage is its susceptibility to corrosion. While ductile iron is more resistant to corrosion than traditional cast iron, it is still prone to rust and deterioration over time. This can lead to reduced lifespan and potential leaks or pipe failures. Additionally, ductile iron pipe has limited flexibility and is not as resistant to ground movement or settlement. This can result in cracking or breaking of the pipe, especially in areas with unstable soil conditions or seismic activity. Lastly, ductile iron pipe can have a rough interior surface, which can lead to increased friction and reduced flow capacity. This can result in higher pumping costs and decreased efficiency in fluid transportation. Overall, while ductile iron pipe has its advantages, such as its strength and durability, these disadvantages should be carefully considered when choosing the appropriate piping material for a specific project.

Q:What is the expected pressure class for ductile iron pipes?: The pressure class anticipated for ductile iron pipes may differ based on the particular use and project needs. In a general sense, ductile iron pipes are engineered to manage high-pressure situations and are typically offered in pressure classes spanning from 150 psi to 350 psi. These pressure classes signify the utmost operational pressure that the pipe can endure while preserving its structural soundness. To ascertain the suitable pressure class for ductile iron pipes in a specific scenario, it is crucial to refer to industry standards, guidelines, and project specifications.

Q:Can ductile iron pipes be used in gravity sewer systems?: Ductile iron pipes find great utility in gravity sewer systems. Renowned for their robustness and durability, they are extensively employed in diverse applications, including sewer systems. Boasting exceptional corrosion resistance, they can withstand immense pressure and heavy burdens. Moreover, their flawlessly smooth interior surface curtails friction and enhances the transportation of waste and wastewater. Consequently, they emerge as an ideal option for gravity sewer systems, where the seamless flow of sewage hinges upon gravity to traverse the pipes.

Q:Can ductile iron pipes be used for submarine pipelines?: Submarine pipelines can indeed utilize ductile iron pipes. Ductile iron, celebrated for its robustness and durability, proves suitable for a range of applications, including those submerged underwater. For decades, ductile iron pipes have been successfully employed in the construction of submarine pipelines. They possess the ability to endure the harsh conditions prevalent in underwater environments, such as corrosion, pressure, and shifting seabeds. Furthermore, ductile iron pipes display exceptional resistance to external loads, rendering them ideal for submarine pipelines that bear the weight of water and potential impacts. However, it remains imperative to consider factors such as coating, cathodic protection, and proper installation techniques to ensure the long-term performance and integrity of the submarine pipeline.

Q:What is the expected cyclic fatigue life of ductile iron pipes?: The expected cyclic fatigue life of ductile iron pipes can vary depending on several factors such as the quality of the material, design and installation practices, operating conditions, and maintenance. However, ductile iron pipes generally have a long fatigue life, often exceeding 100 years under normal operating conditions.

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:Are ductile iron pipes resistant to chemicals or solvents?: Ductile iron pipes are generally resistant to a wide range of chemicals and solvents. This is due to their composition, which includes a high percentage of iron and carbon, along with small amounts of other alloying elements like silicon, manganese, and magnesium. These alloying elements contribute to the overall strength and durability of ductile iron pipes, making them highly resistant to corrosion and chemical attack. However, it is important to note that the resistance of ductile iron pipes to chemicals and solvents can vary depending on the specific substance and its concentration. Some aggressive chemicals or solvents, particularly those with high acidity or alkalinity, may cause gradual corrosion or degradation of the pipe material over time. In such cases, it is advisable to consult with the pipe manufacturer or a professional engineer to ensure the compatibility of the pipe with the specific chemicals or solvents being used. Additionally, proper installation and maintenance practices play a crucial role in maintaining the chemical resistance of ductile iron pipes. Regular inspection, cleaning, and protective coatings can help to prolong the lifespan and performance of the pipes in the presence of various chemicals or solvents.

Q:How does ductile iron pipe handle changes in pipe diameter or size?: Ductile iron pipe is capable of handling changes in pipe diameter or size quite effectively. It has the advantage of being highly flexible and resistant to deformation, allowing it to accommodate variations in pipe dimensions without compromising its structural integrity. This flexibility is particularly beneficial in situations where there are thermal expansions or contractions, ground movement, or other external factors affecting the pipe's diameter. Overall, ductile iron pipe's ability to handle changes in size makes it a reliable and durable choice for various piping applications.

Q:Method for joining cast iron pipes: The connection between the pipe and the pipe adopts the form of socket type or flange disk interface. According to the function, it can be divided into two kinds: flexible interface and rigid interface. The flexible interface is sealed with rubber ring, which allows a certain degree of corner and displacement, so it has good seismic resistance and tightness. It is easy and quick to install than rigid interface. It has little labor intensity according to the casting method.

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