Ductile Iron Pipe DN150

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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:Ductile cast iron can replace copper sleeve: The tensile and compressive capacity of the ball milled cast iron is not as good as that of copper. The hardness of Rongchang graphite copper sheath can reach HB210

Q:What is the expected bending stress capacity of ductile iron pipes?: The expected bending stress capacity of ductile iron pipes can vary depending on various factors such as the pipe's diameter, wall thickness, and the specific grade of ductile iron used. However, generally speaking, ductile iron pipes have a high bending stress capacity compared to other pipe materials. Ductile iron pipes are known for their high tensile strength and flexibility, making them capable of withstanding significant bending stresses. The exact bending stress capacity can be determined through rigorous testing and analysis by considering factors like the pipe's mechanical properties, dimensions, and the maximum allowable deflection. It is important to note that the bending stress capacity of ductile iron pipes should be evaluated in accordance with industry standards and guidelines. These may include standards such as the American Water Works Association (AWWA) C150 or International Organization for Standardization (ISO) 2531, which provide specifications and testing methods for ductile iron pipes. Ultimately, the expected bending stress capacity of ductile iron pipes is determined by several factors and should be assessed based on the specific requirements of the application, considering industry standards and guidelines for accurate and reliable results.

Q:How are ductile iron pipes protected against abrasion or wear?: Ductile iron pipes are protected against abrasion or wear through various methods and protective coatings. One of the most common methods is the application of cement mortar lining on the inner surface of the pipe. The cement mortar creates a smooth and hard layer that resists the effects of abrasion and wear caused by the flowing water or other materials passing through the pipe. Additionally, ductile iron pipes can be externally protected by applying a bituminous or epoxy coating. These coatings provide a barrier against external factors such as soil or chemicals that may cause wear or corrosion. The coating acts as a protective layer, preventing direct contact between the iron pipe and the surrounding environment. Moreover, for areas with severe abrasion or wear conditions, special linings or coatings can be applied. Polyethylene encasement or polyurethane lining can be used to provide enhanced protection against abrasion, particularly in areas where the pipe is exposed to high levels of turbulence or abrasive materials. In some cases, ductile iron pipes can also be reinforced with additional materials such as fiberglass or steel wire to increase their resistance to abrasion or wear. These reinforcements provide an extra layer of protection, strengthening the pipe and reducing the likelihood of damage. Overall, ductile iron pipes are designed with a combination of protective measures to ensure their durability and resistance to abrasion or wear. These measures include cement mortar linings, protective coatings, special linings or coatings for severe conditions, and reinforcements. These protective methods help extend the lifespan of the pipes and maintain their functionality even in harsh environments.

Q:Are ductile iron pipes resistant to acid attacks?: Yes, ductile iron pipes are generally resistant to acid attacks. Ductile iron is a type of cast iron that has been treated with magnesium to improve its strength and ductility. This treatment creates a more resistant material that can withstand corrosive environments, including acids. However, it is important to note that the level of resistance may vary depending on the specific acid and concentration involved. In highly corrosive environments, such as those with strong acids or high concentrations, additional protective measures such as lining or coating the pipes may be necessary. Additionally, regular inspection and maintenance are also important to ensure the long-term durability and resistance of ductile iron pipes.

Q:What are the different types of joints used with ductile iron pipe?: The different types of joints commonly used with ductile iron pipe include push-on joints, mechanical joints, restrained joints, flanged joints, and welded joints. Each type of joint offers different benefits and is used depending on the specific requirements of the installation.

Q:How does ductile iron pipe perform in areas with high ground movement?: Areas with high ground movement are well-suited for the exceptional performance of ductile iron pipe. Its unique properties and design ensure a high resistance to deformation and damage caused by ground shifting, settling, or seismic activities. The material's ductility enables it to withstand significant stress and strain without fracturing or breaking, setting it apart from rigid materials like cast iron or PVC. Ductile iron pipe's ability to flex and absorb ground movement prevents catastrophic failures and guarantees the integrity of the pipeline system. Moreover, ductile iron pipe is manufactured with various joint configurations that enhance its performance in areas with high ground movement. Flexible joints, like restrained or mechanical joints, effectively accommodate movement by allowing limited rotation and translation, minimizing the risk of pipe separation or joint failure. Additionally, the robust construction of ductile iron pipe, featuring a thick wall thickness and high tensile strength, offers added protection against ground movement. This strength enables the pipe to withstand external loads and forces induced by the ground, maintaining its structural integrity and preventing deformation. To summarize, ductile iron pipe is an excellent choice for areas with high ground movement due to its exceptional ductility, flexible joints, and robust construction. Its ability to absorb ground movement while ensuring the functionality and safety of the pipeline system establishes it as a reliable and durable option in challenging environments.

Q:Can ductile iron pipe be used for high-pressure gas systems?: Yes, ductile iron pipe can be used for high-pressure gas systems. Ductile iron pipe is known for its high strength and durability, making it suitable for applications that require high-pressure systems. It possesses excellent mechanical properties, including high tensile strength, yield strength, and impact resistance, which allow it to withstand the pressures associated with gas transmission. Furthermore, ductile iron pipe is resistant to corrosion, making it a reliable choice for long-term use in high-pressure gas systems. However, it is important to consider the specific requirements and regulations of the gas system, as well as consult with industry professionals, to ensure that the ductile iron pipe is installed and maintained correctly for optimal safety and performance.

Q:How do ductile iron pipes handle water hammer?: Ductile iron pipes are well-suited to handle water hammer due to their inherent strength and flexibility. The high tensile strength of ductile iron helps absorb and dampen the pressure surges caused by water hammer, preventing any significant damage to the pipes. Additionally, the inherent ductility of these pipes allows them to flex and absorb the impact of water hammer, reducing the likelihood of cracks or bursts. Overall, ductile iron pipes provide a reliable and durable solution for managing water hammer in water distribution systems.

Q:Can ductile iron pipes be used for water main extensions?: Yes, ductile iron pipes can be used for water main extensions. Ductile iron pipes have excellent strength and durability, making them suitable for carrying water over long distances and withstanding high pressure. They are corrosion resistant and have a long lifespan, making them a reliable choice for water main extensions.

Q:Are ductile iron pipes suitable for irrigation systems in agricultural fields?: Yes, ductile iron pipes are suitable for irrigation systems in agricultural fields. Ductile iron pipes have excellent strength, durability, and corrosion resistance, making them ideal for carrying water in irrigation systems. They can withstand high pressure and heavy loads, ensuring reliable water supply to agricultural fields for irrigation purposes.

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