DUCTILE IRON PIPE K8 DN500

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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 desalination plants?: Yes, ductile iron pipes are suitable for desalination plants. They possess excellent corrosion resistance and durability, making them ideal for transporting seawater and brine solutions commonly found in desalination processes. Additionally, ductile iron pipes have high tensile strength, allowing them to withstand the high pressure and fluctuating temperatures associated with desalination operations.

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:Method for cutting large diameter ductile iron pipe: When the ratio of oxygen to acetylene is 1 to 1.2, the flame produced is called neutral flame, also known as normal flame. It consists of flame core, inner and outer flame: near the welding nozzle at the flame core, a bright white; followed by the flame, a blue purple, the highest temperature, about 3150 DEG C, from the front cone at 2 ~ 4mm, and the application of welding wire to the workpiece; the outer flame is orange red. Neutral flame is a flame commonly used in welding. It is used to weld low carbon steel, medium carbon steel, alloy steel, copper and aluminum alloy.

Q:How are ductile iron pipes repaired in case of damage?: Due to their high durability and strength, ductile iron pipes are commonly utilized in various applications. However, like any other materials, these pipes can sustain damage over time due to external influences or internal corrosion. In such instances, there exist several techniques available for repairing ductile iron pipes. One prevalent method is the trenchless repair technique, which allows for the restoration of the damaged section without the need for extensive excavation. This method typically employs specialized equipment to access and repair the affected area. Its advantages lie in minimizing disruption to the surrounding environment and reducing excavation costs. Another approach for repairing ductile iron pipes involves the application of epoxy lining. This process entails the use of epoxy resin to seal any cracks or leaks on the interior surface of the pipe. Epoxy lining is a cost-efficient and effective solution as it provides long-lasting repairs and enhances the overall condition of the pipe. In cases where the damage is severe or extensive, it may be necessary to replace the damaged section of the ductile iron pipe. This typically involves removing the compromised portion and installing a new pipe section. The replacement process may require excavation and can be more time-consuming and costly compared to other repair methods. Nonetheless, it guarantees a comprehensive and permanent solution for the damaged pipe. It is essential to note that the choice of repair method for ductile iron pipes depends on factors such as the extent of the damage and accessibility. Professional assessment and inspection play a crucial role in determining the most suitable repair technique. Consulting experienced pipeline repair specialists or civil engineers is highly recommended to ensure the most effective and durable repair solution for ductile iron pipes.

Q:Can ductile iron pipes be used for underground fire protection systems?: Ductile iron pipes are indeed applicable for underground fire protection systems. Their exceptional strength and durability render them suitable for enduring the intense pressure and high temperatures that may arise during a fire. Moreover, these pipes exhibit significant resistance to corrosion, a vital attribute for long-term underground usage. In addition, they possess exceptional flow characteristics, enabling swift and efficient water delivery for extinguishing fires. All in all, ductile iron pipes prove to be a dependable and efficient selection for underground fire protection systems.

Q:What are the typical joint restraint requirements for ductile iron pipes under pressure?: The typical joint restraint requirements for ductile iron pipes under pressure include the use of mechanical joint restraining devices such as bolts, gaskets, and thrust blocks. These restraints are necessary to prevent the pipes from separating or moving due to the internal pressure of the fluid being transported. Additionally, proper alignment and anchoring of the pipes are essential to ensure the integrity and stability of the pipeline system.

Q:What are the different corrosion protection options for ductile iron pipe?: There are several corrosion protection options available for ductile iron pipe to ensure its longevity and durability. These options include: 1. Cement Mortar Lining: This involves coating the inner surface of the pipe with a layer of cement mortar, which acts as a barrier between the pipe and corrosive elements in the water or soil. Cement mortar lining provides excellent corrosion resistance and can last for several decades. 2. Polyethylene Encasement: This method involves wrapping the ductile iron pipe with a layer of polyethylene material. The polyethylene acts as a physical barrier, protecting the pipe from external corrosive elements. Polyethylene encasement is commonly used in aggressive soil conditions and can offer long-lasting protection. 3. Internal and External Coatings: Various types of coatings can be applied to the inner and outer surfaces of the ductile iron pipe to provide corrosion resistance. These coatings can be epoxy, polyurethane, or fusion-bonded epoxy (FBE) coatings. These coatings create a barrier between the pipe and the surrounding environment, preventing corrosion. 4. Cathodic Protection: This method involves using an electrical current to protect the pipe from corrosion. Cathodic protection systems can be either galvanic (sacrificial anode) or impressed current systems. These systems direct the flow of electrons to prevent the oxidation of the ductile iron pipe. 5. Zinc Coating: Zinc coating, also known as galvanizing, involves applying a layer of zinc to the surface of the ductile iron pipe. The zinc acts as a sacrificial anode, corroding instead of the iron pipe. Zinc coating provides effective corrosion protection, particularly in soil conditions with low resistivity. It's important to note that the choice of corrosion protection option for ductile iron pipes depends on various factors such as the environment, water chemistry, soil conditions, and expected service life. Consulting with corrosion protection specialists and engineers can help in selecting the most suitable option for specific applications.

Q:Can ductile iron pipes be used in agricultural applications?: Ductile iron pipes are indeed suitable for agricultural applications. They possess exceptional strength and durability, rendering them appropriate for a range of agricultural purposes. These pipes find utility in irrigation systems, water supply pipelines, and drainage systems within farms and agricultural fields. Given their resistance to corrosion and long lifespan, ductile iron pipes are essential for agricultural applications that involve exposure to various environmental factors and chemicals. Moreover, the pipes' ability to withstand high-pressure water flow makes them ideal for transporting water for irrigation purposes. In summary, ductile iron pipes are a dependable and efficient choice for agricultural applications due to their strength, durability, resistance to corrosion, and capacity to handle high-pressure water flow.

Q:What is the exterior anticorrosion of nodular cast iron pipes?: First clean the impurity on the surface of the pipe or fitting, and then sprayed zinc treatment (130g/m and asphalt paint coating fand) not less than 70 m

Q:Are ductile iron pipes suitable for power plant cooling systems?: Yes, ductile iron pipes are suitable for power plant cooling systems. Ductile iron pipes offer several advantages that make them ideal for such applications. Firstly, ductile iron is known for its high strength and durability, making it capable of withstanding the high pressure and heavy loads often associated with power plant cooling systems. Additionally, ductile iron pipes have excellent resistance to corrosion, which is crucial in an environment where water and other cooling fluids are constantly flowing. Furthermore, ductile iron pipes have good thermal conductivity, meaning they can efficiently transfer heat away from the power plant equipment, contributing to the overall cooling process. Lastly, ductile iron pipes are also cost-effective compared to other materials commonly used in power plant cooling systems, making them a practical choice for such applications. Overall, ductile iron pipes are a reliable and suitable option for power plant cooling systems due to their strength, corrosion resistance, thermal conductivity, and cost-effectiveness.

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