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: What is the expected thermal expansion coefficient of ductile iron pipes?: The thermal expansion coefficient of ductile iron pipes can vary due to several factors, such as the iron's specific composition and the temperature range of pipe usage. However, as a general rule, ductile iron pipes typically have a thermal expansion coefficient ranging from 10 to 14 x 10^-6 per degree Celsius (10-14 μm/m°C). This means that for every increase of one degree Celsius in temperature, the length of a ductile iron pipe will expand by approximately 10 to 14 micrometers per meter. It is important to acknowledge that these values are not exact and may differ depending on the specific circumstances and application of the pipes.

Q: Are ductile iron pipes resistant to acid attacks?: Yes, ductile iron pipes are generally resistant to acid attacks. Ductile iron has a protective layer of graphite and a dense matrix structure that helps in preventing the penetration of acid. However, prolonged exposure to highly corrosive acids or extreme pH levels may still cause some degradation over time.

Q: What are the requirements for the hydrostatic test of ductile iron pipes?: The hydraulic pressure test shall be carried out in the backfill before trying to allow the pressure after passing the backfill, backfill, the graded gravel fill to 300mm above the top of pipe, and then the soil backfill, backfill process by 200~300 tamped pipeline above 500mm within more than 500 can be used in artificial ramming, mechanical compaction. The degree of compaction shall not be less than 0.93.

Q: What is the expected service life of ductile iron pipe?: The expected service life of ductile iron pipe can vary depending on various factors such as the quality of the pipe, the environment it is installed in, and the maintenance and care it receives. However, on average, ductile iron pipe has a life expectancy of 80 to 100 years.

Q: Can ductile iron pipes be used in areas with high levels of industrial effluents?: Areas with high levels of industrial effluents can indeed utilize ductile iron pipes. Ductile iron, a variant of cast iron known for its enhanced flexibility and strength, possesses remarkable resistance to corrosion and abrasion. Hence, it is well-suited for managing a wide range of industrial effluents, including those abundant in chemicals, acids, or other corrosive substances. To bolster their defense against chemical attacks, ductile iron pipes feature protective linings, such as cement mortar or polyethylene. These linings serve as barriers, preventing direct contact between the effluents and the iron material. Consequently, the pipes maintain their longevity and integrity. In addition, ductile iron pipes have gained considerable usage in industrial applications involving corrosive environments. They have shown themselves to be dependable and long-lasting, even in demanding conditions. Of course, proper maintenance and regular inspections remain crucial in ensuring the ongoing performance of ductile iron pipes within areas possessing high levels of industrial effluents. It is pivotal to bear in mind the specific characteristics of the effluents and seek guidance from experts or manufacturers when determining the most suitable pipe materials and linings for a particular industrial setting.

Q: What is the expected surge pressure rating of ductile iron pipes?: The surge pressure rating for ductile iron pipes can vary based on several factors, including pipe diameter, thickness, joint type, and manufacturer specifications. Generally, ductile iron pipes are built to withstand surge pressures ranging from 150% to 200% of their working pressure rating. For instance, if a ductile iron pipe has a working pressure rating of 250 psi, it can typically handle surge pressures of 375 psi to 500 psi. To obtain accurate surge pressure ratings for the specific ductile iron pipes being used, it is crucial to refer to the manufacturer's specifications and guidelines.

Q: How does ductile iron pipe compare to PVC pipe in terms of performance and cost?: Ductile iron pipe and PVC pipe have different characteristics in terms of performance and cost. Ductile iron pipe is known for its strength, durability, and ability to withstand high pressure and heavy loads, making it ideal for applications that require robust performance such as water distribution systems. On the other hand, PVC pipe is lightweight, corrosion-resistant, and more flexible, making it suitable for above-ground and non-pressurized applications like drainage systems. In terms of cost, PVC pipe is generally less expensive than ductile iron pipe, especially for smaller diameter pipes. However, as the diameter increases, ductile iron pipe becomes more cost-effective due to its superior strength and longer lifespan, which reduces maintenance and replacement costs over time. Ultimately, the choice between ductile iron and PVC pipe depends on the specific application, budget, and desired performance characteristics.

Q: How many meters does the cast iron water supply pipe dn150,1 tons?: Centrifugal ductile iron pipe water-cooled metal type centrifuge daira executed by.Dg100 mm following the closed mold mold jacket cooling, more than Dg150rnm with rain type cooling.

Q: How is ductile iron pipe protected against external corrosion?: Ductile iron pipe is protected against external corrosion through a variety of methods that ensure its durability and longevity. One common method is the application of protective coatings. The pipe is typically coated with a layer of zinc or asphaltic material, which acts as a barrier between the iron pipe and the surrounding environment. This coating helps to prevent direct contact between the pipe and corrosive elements such as soil, moisture, and chemicals, thereby reducing the risk of corrosion. Additionally, ductile iron pipes are often wrapped with a layer of polyethylene or polypropylene tape. This tape provides an extra layer of protection against external corrosion by serving as a physical barrier that shields the pipe from moisture and other potentially corrosive substances. The tape is applied with care to ensure complete coverage and adherence to the pipe's surface. Furthermore, cathodic protection is commonly employed to safeguard ductile iron pipes against external corrosion. This technique involves the installation of sacrificial anodes or impressed current systems near the pipe. These anodes generate a protective electrical current that counteracts the corrosion process, effectively inhibiting the deterioration of the pipe's surface. Lastly, proper installation practices play a crucial role in preventing external corrosion. It is essential to ensure that the pipe is buried at an appropriate depth, allowing for adequate soil coverage. This helps to minimize exposure to corrosive elements and maintain the integrity of the protective coatings. Additionally, proper backfilling techniques and the use of corrosion-resistant bedding materials can further enhance the pipe's resistance to external corrosion. In conclusion, ductile iron pipe is protected against external corrosion through a combination of protective coatings, tape wrapping, cathodic protection systems, and proper installation practices. These measures work together to provide a robust defense against the corrosive forces that the pipe may encounter, ensuring its longevity and reliability in various applications.