DUCTILE IRON PIPES C Class DN700 System 1

DUCTILE IRON PIPES C Class DN700

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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:How does the white iron appear in the case of ductile iron?: Casting cooling, surface and thin section at often produce white. White tissue hard and brittle, poor processing performance, easy peeling. So it is necessary to use the annealing (or normalizing) method to eliminate white tissue. The annealing process: heating to 2 DEG C 550950 ~ 5 h, then 500 to 550 DEG C Furnace cooling again followed by air cooling. During high temperature insulation, high travel cementite eutectic cementite decomposition of graphite and A in the subsequent two carburizing cooling process and eutectoid cementite decomposition, graphitization process. Due to the decomposition of cementite, resulting in the decrease in hardness, thereby improving machinability.Hope to help you.

Q:What is the K9 standard pressure for ductile iron pipes?: Ductile weakness: ductile cast iron pipes connected by human factors such as the operation level of responsibility, influence, construction not convenient. The advantages of PE PE PE pipe has good corrosion resistance and its anti inorganic performance than that of the metal pipe is much stronger in the buried without corrosion, construction convenient. Small diameter PE pipe in the price performance ratio is better than that of steel and ductile iron.PE tube have disadvantages: benzene, gasoline, carbon tetrachloride and other organic solvents have certain effect on pe. If the organic solvent is infiltrated into the polyethylene, the swelling will occur, and its physical properties will be decreased. Its pressure resistance and temperature resistance are poor.

Q:What is the expected pressure rating for ductile iron pipes?: The expected pressure rating for ductile iron pipes can vary depending on various factors such as the pipe diameter, wall thickness, and the specific application it is being used for. However, generally speaking, ductile iron pipes are designed and manufactured to withstand high-pressure conditions. They are commonly used in water and wastewater systems, where they can typically handle pressures ranging from 150 psi (pounds per square inch) up to 350 psi or even higher. It is important to consult the manufacturer's specifications or relevant industry standards for specific pressure ratings based on the pipe's size and application to ensure safe and reliable operation.

Q:How do ductile iron pipes handle concentrated loads?: Ductile iron pipes are specifically designed to handle concentrated loads effectively. Due to their unique composition and manufacturing process, they possess excellent strength and durability, making them highly resistant to cracking or breaking under heavy loads. One of the key characteristics of ductile iron pipes is their high tensile strength, which enables them to withstand concentrated loads without deformation. The pipes are made by adding small amounts of magnesium to cast iron during the production process, which transforms the brittle graphite flakes into nodular graphite. This modification significantly enhances the material's strength and ductility, allowing it to handle concentrated loads more effectively. Additionally, ductile iron pipes have a high modulus of elasticity, meaning they can deform elastically under a load and then return to their original shape once the load is removed. This property enables the pipes to distribute the concentrated load evenly along their entire length, minimizing stress concentrations and reducing the risk of fractures or failures. Furthermore, ductile iron pipes have a thick, robust wall thickness, providing them with exceptional structural integrity. This thickness allows the pipes to bear significant loads and withstand pressure variations without compromising their overall performance. In summary, ductile iron pipes are specifically engineered to handle concentrated loads due to their high tensile strength, elastic deformation capabilities, and thick wall thickness. These characteristics make them a reliable choice for various applications, including water and wastewater systems, as they can withstand significant external forces without compromising their structural integrity.

Q:Can ductile iron pipes be used in earthquake-prone areas?: Yes, ductile iron pipes can be used in earthquake-prone areas. Ductile iron is a strong and flexible material that can withstand the ground movement and vibrations caused by earthquakes. It has excellent ductility, meaning it can deform without fracturing or breaking under stress. This property allows ductile iron pipes to absorb the energy generated during an earthquake, reducing the risk of pipe failure or rupture. Additionally, ductile iron pipes have been successfully used in seismic zones for many years, proving their resilience and reliability in such areas. However, it is important to note that proper installation and design considerations, such as using appropriate jointing methods and ensuring proper anchoring, are essential for ensuring the performance of ductile iron pipes in earthquake-prone areas.

Q:Are ductile iron pipes suitable for trenchless installation methods?: Yes, ductile iron pipes are suitable for trenchless installation methods. Ductile iron pipes are known for their strength, durability, and flexibility, making them ideal for trenchless installation methods such as horizontal directional drilling (HDD) and pipe bursting. HDD involves drilling a small pilot hole underground and then pulling the ductile iron pipe through the hole, without the need for extensive trenching. Ductile iron pipes can withstand the pulling forces exerted during this process and can be easily guided through the underground path. Pipe bursting is another trenchless method where an existing pipe is replaced by breaking it apart while simultaneously pulling a new ductile iron pipe into place. The strength and flexibility of ductile iron pipes allow them to withstand the force required to burst the existing pipe and replace it with minimal disruption to the surrounding area. In both these trenchless installation methods, ductile iron pipes offer several advantages. They have a high resistance to corrosion and can withstand high-pressure applications, making them suitable for a wide range of underground environments. Ductile iron pipes also have a long service life, reducing the need for frequent replacement and maintenance. Overall, ductile iron pipes are a reliable and suitable choice for trenchless installation methods, providing efficient and cost-effective solutions for underground pipe installations.

Q:How long is the service life of the cast iron pipe, and the time of use of ductile iron pipes?: Ductile iron is a new type of pipe, as long as we use it properly, the quality of its products, then the use of ductile iron pipes for 20-35 years, basically no problem. But whether it is ductile cast iron pipe, or some other things, the use of more years, and more or less, there will be some problems, ductile iron pipe can not escape the robbery. However, as long as we use the ductile iron pipe in the process of careful care, the service life of the problem is not to worry about.

Q:What is the maximum temperature that ductile iron pipe can handle?: The maximum temperature that ductile iron pipe can handle typically ranges between 350-400 degrees Fahrenheit.

Q:What is the typical lifespan of ductile iron pipes?: The lifespan of ductile iron pipes can differ based on multiple factors, including pipe quality, environmental conditions, and maintenance practices. On average, these pipes typically last approximately 75 to 100 years. This longevity establishes them as a sturdy and enduring choice for water and sewage transport systems. Through correct installation and consistent upkeep, these pipes can endure corrosion, pressure, and other external elements, guaranteeing their durability and dependability. Furthermore, advancements in coatings and linings have extended the lifespan of ductile iron pipes, making them an exceptional option for infrastructure projects.

Q:Can ductile iron pipes be used in areas with high soil erosion?: Yes, ductile iron pipes can be used in areas with high soil erosion. Ductile iron is known for its high tensile strength and durability, making it resistant to external forces such as soil erosion. It is a suitable choice for underground piping systems in such areas, providing long-term reliability and stability.

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