Ductile Iron Pipe DN150

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Specifications

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Place of Origin:	China (Mainland)	Brand Name:	CMAX	Model Number:	T type / K type / Flange type
Length:	6m / 5.7m / Negotiable	Standard:	ISO2531 / EN545 / EN598	Application:	Potable / Sewage water
Diameter:	DN80~DN2200	Shape:	Round	Hardness:	230
Pipe Wall Thickness:	standard	Pull Strength:	420	Yield (≥ MPa):	300
Material:	Ductile Iron	Type:	Centrifugal ductile cast iron pipe	Certification:	ISO2531 / EN545 / EN598
Outer Diameter:	80-2200	Thickness:	standard	Specification:	DN80~DN2200

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Ductile iron pipe is sized according to a dimensionless term known as the Pipe Size or Nominal Diameter (known by its French abbreviation, DN). This is roughly equivalent to the pipe's internal diameter in inches or millimeters. However, it is the external diameter of the pipe that is kept constant between changes in wall thickness, in order to maintain compatibility in joints and fittings. Consequently the internal diameter varies, sometimes significantly, from its nominal size. Nominal pipe sizes vary from 3 inches up to 64 inches, in increments of at least 1 inch, in the USA.

Pipe dimensions are standardised to the mutually incompatible AWWA C151 (U.S. Customary Units) in the USA, ISO 2531 / EN 545/598 (metric) in Europe, and AS/NZS 2280 (metric) in Australia and New Zealand. Although both metric, European and Australian are not compatible and pipes of identical nominal diameters have quite different dimensions.

Flanges are flat rings around the end of pipes which mate with an equivalent flange from another pipe, the two being held together by bolts usually passed through holes drilled through the flanges. A deformable gasket, usually elastomeric, placed between raised faces on the mating flanges provides the seal. Flanges are designed to a large number of specifications that differ because of dimensional variations in pipes sizes and pressure requirements, and because of independent standards development. In the U.S. flanges are either threaded or welded onto the pipe. In the European market flanges are usually welded on to the pipe. In the U.S. flanges are available in a standard 125 lb. bolt pattern as well as a 250 lb (and heavier) bolt pattern (steel bolt pattern). Both are usually rated at 250 psi (1,700 kPa). A flanged joint is rigid and can bear both tension and compression as well as a limited degree of shear and bending. It also can be dismantled after assembly. Due to the rigid nature of the joint and the risk of excessive bending moment being imposed, it is advised that flanged pipework is not buried.

Current flange standards used in the water industry are ANSI B16.1 in the USA, EN 1092 in Europe, and AS/NZS 4087 in Australia and New Zealand.

Ductile iron pipe is somewhat resistant to internal corrosion in potable water and less aggressive forms of sewage. However, even where pipe material loss and consequently pipe wall reduction is slow, the deposition of corrosion products on the internal pipe wall can reduce the effective internal diameter. A variety of linings are available to reduce or eliminate corrosion, including cement mortar, polyurethane and polyethylene. Of these, cement mortar lining is by far the most common.

Polyurethane (Plastic wrap) marginally protects piping made of ductile cast iron against corrosion and ensures meeting hygienic standards for drinking water at the same time in the early years. Polyurethane is used for both the inside lining and the outside coating. Because of polyurethane's elasticity, the coating remains intact even if the pipe is deformed. A major problem is that the poly wrap is not able to be uniformly installed or even installed without rips and creates isolated corrosion attacks. Corrosion Experts

Polyurethane coatings were first used in 1972.[citation needed] In comparison with other coatings, the internal polyurethane lining exhibits a high resistance to various different media such as drinking water, wastewater, de-mineralised water, industrial water and gas, as well as to aggressive solutions such as sulphuric acid. The polyurethane outside coating is suitable for all kinds of soil.

Polyurethane is a thermosetting plastic with no solvents, with a three-dimensionally linked molecular structure giving it mechanical stability. The polyurethane used for conating has the following standard properties, according to EN 545 and ISO 2531 standards.

Q: How is ductile iron pipe different from cast iron pipe?: Ductile iron pipe is different from cast iron pipe in terms of its composition and strength. Ductile iron pipe is made from a type of iron known as ductile iron, which contains small amounts of carbon and other elements that enhance its flexibility and toughness. Cast iron pipe, on the other hand, is made from cast iron, which is more brittle and less flexible than ductile iron. This makes ductile iron pipe more resistant to cracking and breaking, making it suitable for high-pressure applications.

Q: How are ductile iron pipes connected?: There are several methods commonly used to connect ductile iron pipes, including flanged joints, mechanical joints, and push-on joints. Flanged joints involve connecting two sections of pipe by using a flanged coupling. The pipe ends have flanges that are securely bolted together, creating a connection that is both strong and leak-proof. This method is often used for pipes with larger diameters or in situations where a rigid joint is necessary. Mechanical joints use a mechanical joint gland and rubber gasket to create a seal that is watertight. The ends of the pipes are inserted into the gland, and then bolts are tightened to compress the gasket, ensuring a reliable connection. This method is frequently employed in water distribution systems because it is flexible and easy to install. Push-on joints utilize a rubber gasket to create a tight seal between sections of pipe. The gasket is placed in a groove on one end of a pipe, and then the other pipe is pushed onto it, resulting in a compression seal. This method is quick and straightforward, making it suitable for a variety of applications, such as sewer systems and underground piping. Ultimately, the choice of connection method for ductile iron pipes depends on factors such as pipe diameter, application requirements, and installation conditions. It is of utmost importance to adhere to the manufacturer's recommendations and industry standards to ensure proper installation and dependable performance.

Q: Can ductile iron pipes be used in areas with high levels of hydrogen sulfide gas and corrosion potential?: Ductile iron pipes can be used in areas with high levels of hydrogen sulfide gas and corrosion potential, but it is important to consider certain factors before making a decision. Ductile iron pipes have a high resistance to corrosion, especially when they are properly protected with external coatings and linings. This makes them suitable for environments with moderate levels of hydrogen sulfide gas and corrosion potential. However, in areas with extremely high levels of hydrogen sulfide gas and severe corrosion potential, other materials like corrosion-resistant alloys or specially coated pipes may be more appropriate. It is crucial to conduct a thorough evaluation of the specific conditions in the area to determine the suitability of ductile iron pipes. Factors such as the concentration of hydrogen sulfide gas, the presence of other corrosive elements or chemicals, and the overall corrosiveness of the environment should be considered. Additionally, the local regulations and industry standards must be consulted to ensure compliance and safety. In conclusion, while ductile iron pipes can withstand moderate levels of hydrogen sulfide gas and corrosion potential, a comprehensive assessment of the specific conditions is necessary to determine their suitability. Consulting with experts in the field and considering alternative materials may be required in areas with high levels of hydrogen sulfide gas and severe corrosion potential.

Q: Are ductile iron pipes suitable for railway crossings?: Railway crossings can indeed utilize ductile iron pipes. Ductile iron, a robust and long-lasting material, finds extensive use in numerous applications, which include water and sewage systems. Its exceptional tensile strength and flexibility allow it to withstand heavy loads and vibrations, both of which are commonly encountered in the vicinity of railway crossings. Moreover, ductile iron pipes exhibit exceptional resistance to corrosion, making them particularly valuable in areas prone to moisture and exposure to diverse weather conditions. This resistance guarantees the pipes' durability, ultimately reducing the need for maintenance and replacement, thus cutting costs. Furthermore, ductile iron pipes are renowned for their effortless installation and versatility. They seamlessly integrate with other pipe types and fittings, facilitating their incorporation into the overall railway crossing infrastructure. However, it is important to bear in mind that the suitability of ductile iron pipes for railway crossings hinges on various factors, such as load requirements, soil conditions, and specific project specifications. Consulting engineering professionals and adhering to industry standards and regulations is vital to ensure the appropriate selection and installation of ductile iron pipes for railway crossings.

Q: What is the expected bending stress capacity of ductile iron pipes?: The expected bending stress capacity of ductile iron pipes varies depending on the specific grade and size of the pipe, as well as factors such as installation conditions and external loads. However, ductile iron pipes generally have high strength and flexibility, allowing them to withstand significant bending stresses. It is recommended to refer to the manufacturer's specifications and engineering guidelines for a more accurate estimation of the bending stress capacity of a particular ductile iron pipe.

Q: Are ductile iron pipes resistant to hydrogen sulfide corrosion?: Yes, ductile iron pipes are resistant to hydrogen sulfide corrosion due to their high resistance to chemical corrosion and their protective inner lining that prevents contact between the pipe material and the corrosive elements.

Q: A tube is used only in ductile iron pipes, isn't it?: Is that the nodular graphite cast iron pipe is called centrifugal ductile iron pipe, it has the properties of nature, iron and steel, excellent corrosion resistance, good ductility, good sealing effect, simple installation, mainly for municipal, industrial and mining enterprises, water supply, gas, oil etc.. Water supply pipe is the first choice, with high cost performance.

Q: How does ductile iron pipe compare to PVC pipe in terms of strength?: Ductile iron pipe is generally considered to be stronger than PVC pipe. Ductile iron pipe is made of iron and carbon, which gives it a high tensile strength and resistance to breakage. It can withstand high pressures and is commonly used in heavy-duty applications such as water mains, sewer lines, and industrial piping. On the other hand, PVC pipe is made of a plastic material called polyvinyl chloride. While PVC pipe is lightweight and easy to handle, it is not as strong as ductile iron pipe. PVC pipe is typically used in low-pressure applications such as household plumbing, irrigation systems, and drainage pipes. When comparing the strength of ductile iron pipe to PVC pipe, the former has a higher capacity to handle heavy loads, withstand ground movement, and resist damage from external factors like rocks or tree roots. Ductile iron pipe is also more durable and has a longer lifespan compared to PVC pipe. However, it is important to note that the choice between ductile iron pipe and PVC pipe ultimately depends on the specific requirements of the project. Factors such as cost, environmental conditions, installation ease, and required longevity should all be taken into consideration when deciding which type of pipe to use.

Q: Can ductile iron pipe be used for cooling water systems?: Yes, ductile iron pipe can be used for cooling water systems. Ductile iron pipes are known for their high strength and durability, making them suitable for various applications, including cooling water systems. They have excellent resistance to corrosion, which is important in preventing damage and maintaining the efficiency of the cooling water system. Additionally, ductile iron pipes can handle high-pressure and high-temperature conditions, making them a reliable choice for this purpose.

Q: What is the expected leakage rate of ductile iron pipes?: The expected leakage rate of ductile iron pipes can vary depending on various factors such as the age and condition of the pipes, the quality of installation, and the presence of any external factors that may impact the integrity of the pipes. However, in general, ductile iron pipes are known for their durability and low leakage rates compared to other types of pipes. According to industry standards and studies, the expected leakage rate of well-maintained and properly installed ductile iron pipes is typically less than 0.5 liters per pipe per day (LPPD). This leakage rate is considered acceptable and meets the requirements set by various regulatory bodies and organizations. It is important to note that regular maintenance and inspections are crucial in maintaining the low leakage rate of ductile iron pipes. By identifying and repairing any potential leaks or damages promptly, the overall leakage rate can be effectively minimized. Furthermore, advancements in manufacturing techniques and improvements in pipe design have led to the development of more leak-resistant ductile iron pipes. These pipes may have even lower expected leakage rates than the industry average, further enhancing their overall performance and reliability. Ultimately, while the expected leakage rate of ductile iron pipes can vary, it is generally considered to be low when properly installed and maintained, making them a reliable choice for various water distribution and transmission systems.

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