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What are the long weld neck flanges? A long weld neck flange is a type of flange that features an extended neck or hub. It has a long, tapered neck that is welded to the pipe, providing a smooth transition between the flange and the pipe. The extended neck provides reinforcement and additional strength to the joint. The Long Weld Neck (LWN) connection is the lightest and most economical connections offered for use where a minimum of reinforcing area is required. It is the most commonly used nozzle in the ASME pressure vessel industry. A Long Weld Neck is also the lightest wall connection of the nozzle family. The nozzle that follows the Long Weld Neck with a slightly heavier wall barrel is known as the Heavy Barrel (HB).     The fuction of long weld neck flange Long weld neck flanges are commonly used in piping systems that require high-pressure and high-temperature applications. The extended neck allows for better flow characteristics, minimizing turbulence and pressure drop. It also provides additional space for insulation or corrosion-resistant coatings .Long Weld Neck connections are a crucial part of the pressure vessel industry. Welding is the most efficient and cost-effective way to connect two pieces of metal, so it is the material of choice for many industries, including petrochemical and aerospace.   The design of a long weld neck flange allows for easy welding, making it suitable for critical connections where strength, integrity, and leak-free performance are essential. The longer neck allows for a more gradual transition, reducing stress concentration and improving the overall structural integrity of the joint. Due to their robust design and superior performance, long weld neck flanges are widely used in industries such as oil and gas, petrochemical, power generation, and chemical processing. They are typically made from high-quality materials, such as carbon steel long weld neck flanges, stainless steel long weld neck flanges, or alloy steel long weld neck flanges, to ensure durability and resistance to corrosion.       A long weld neck flange is a specialized flange with an extended neck or hub. It provides strength, smooth flow characteristics, and easy welding in high-pressure and high-temperature piping systems, making it an ideal choice for critical applications.   Wuxi changrun’s product offering with a wide spectrum of ASME pressure vessel connections makes it simple on the customer, as we are capable of producing a nozzle for every application in the pressure vessel industry. Our Long Weld Neck connections are available in various seamless configurations for custom pressure vessel connections. They provide leak-free, long-term service in high-pressure environments.    

Duplex steel has become increasingly popular in industrial settings due to its unique properties, high strength, corrosion resistance, and durability. One of the most commonly used components made from duplex steel is the duplex steel elbow. This component is found in numerous industries, including oil and gas, chemical, and petrochemical manufacturing. This blog post will discuss everything you need to know about duplex steel elbows.     What is the role of elbows in pipelines?  Elbows belong to pipe fittings, and the purpose of using elbows in pipelines is to change the direction of the pipeline. Elbows are used at the turning point of the pipeline to change the direction of the pipeline. The angles of elbows include 15 degree elbows, 30 degree elbows, 45 degree elbows, 60 degree elbows, 90 degree elbows, and 180 degree elbows. The type of elbow including long-radius elbows, short-radius elbows, seamless elbows, and welded elbows. These are the most commonly used elbow angles, which need to be ordered and made according to the installation needs of the construction site project. Long and short-radius elbows differ in their radius of curvature, with long-radius elbows having a larger radius than short-radius elbows. Seamless elbows are made from a single piece of steel and are available in a wider range of sizes and wall thicknesses than welded elbows.The materials can be divided into stainless steel elbows, carbon steel elbows, alloy steel elbows, and duplex steel elbows. When connecting elbows and pipelines, welding is used. Therefore, for the convenience of welding, the ends of general elbows need to be bevelled.       Why Use Duplex Steel Elbows? Duplex steel is a type of stainless steel with a two-phase microstructure consisting of austenitic and ferritic stainless steel. This type of steel offers a unique combination of strength, corrosion resistance, and durability, making it the perfect material for industrial applications. The use of duplex steel elbows offers several advantages over other types of elbows. One of the main benefits is their excellent corrosion resistance, making them suitable for use in harsh environments such as offshore oil rigs, where exposure to seawater can cause significant damage to traditional piping systems. Duplex steel elbows are also known for their high strength, which allows them to withstand high pressure and temperature fluctuations without developing cracks or leaks.     Applications Of Duplex Steel Elbows   Duplex steel elbows are used in various industrial applications, including chemical processing, oil and gas, petrochemical manufacturing, and offshore platforms. They are also found in power generation plants, pharmaceutical manufacturing, and food processing facilities. Their durability, strength, and corrosion resistance make them suitable in environments where other materials would quickly degrade.     Conclusion Duplex steel elbows are essential to numerous industrial applications and offer many benefits over traditional piping systems. Their superior strength and corrosion resistance are ideal for harsh environments such as offshore oil rigs. Duplex steel elbows can provide long-lasting, reliable functions in various applications with regular maintenance and care. This blog post has provided valuable insights into everything you need about duplex steel elbows. Wuxi Cahngrun good at pipe fitting manufacture, choose us is one of your best choice.    

What are Carbon Steel Flanges? Under the imaginative direction of competent personnel, Carbon Steel Flanges are meticulously designed employing modern procedures in the manufacturing facility. To ensure flawlessness and defect-freeness, the offered range is rigorously tested on several quality factors. Due to their unique qualities, these items are highly regarded by customers and employed extensively throughout several industries. offered range is packaged with quality assurance.   Carbon Steel Flanges are used to terminate or join two ends of a pipe. The materials they are made from vary. The carbon steel flange is one example of such a type of flange made from carbon steel. Raw materials used in the production of these flanges are of the highest quality. They contain carbon in the range of 0.25 to 0.60 percent. Due to the high amount of carbon and manganese in the product, it has exceptional ductility and outstanding fabrication qualities.       The manufacturing process of carbon steel flanges The production process of carbon steel flanges generally includes forging, casting, and machining. Forged flange is the process of heating a steel ingot at a high temperature of 1600 ℃, then cooling it to around 800 ℃, and using methods such as hammering or hydraulic pressure to deform the ingot into shape; Casting flanges is the process of pouring liquid steel into a mold, cooling and solidifying it to form a flange. Processing flanges is the process of cutting, forming, and processing plates or round materials. The production process time is relatively short and the price is relatively low, but its strength and pressure resistance are generally weak.       Applications of Carbon Steel Flanges The term “killed Carbon Steel Forged Flanges” refers to a different kind of flange. During the melting process, they are eliminated. Deoxidation occurs as a result of the inclusion of manganese, silicon, and aluminum during the manufacturing of steel. To assist in bolting and joining two pipes together, carbon steel plate flanges are welded onto the pipe Ductile and tough, it is suitable for a variety of applications. These Carbon Steel Pipe Flanges are also highly reliable in frigid temperatures. A water pipeline and a fuel pipeline use them.   To make the steel and cast iron alloy stronger and harder Quenching is the procedure that Carbon Steel Slip On Flanges goes through. They are employed in a variety of petrochemical, engineering, and construction fields. The slip-on flange’s outer diameter is also welded. The end of carbon steel weld neck flanges extends the neck. For a seamless connection, this kind of flange is immediately buttwelded to the pipe. When the conditions are critical and extreme, Indian suppliers of carbon steel flanges advise using these products.       summary Carbon steel flange is a common accessory for connecting pipes and valve equipment, which is widely used in petroleum, chemical, shipping, power and other industries. Carbon steel flanges can be classified into various types based on material and structure, which are suitable for different pipeline connection methods and requirements. When selecting carbon steel flanges, it is necessary to choose according to actual needs and requirements to ensure the safety and stability of connection and operation.  

Tube sheets are mainly used in chemical containers, such as heat exchangers, pressure vessels, boilers, condensers, central air conditioning, evaporators, and seawater desalination, to support and fix the column pipes. The metal material not only makes them highly rigid, but also has great thermal conductivity. There are different types of tube plates, each designed for specific applications. The following are some common types of tube sheets and their specific explanations:     1.Floating tube sheet Floating tubesheets are an important component of floating head heat exchangers. It plays a stabilizing role by being installed inside the floating head heat exchanger and supporting the structure of the tube bundle. When the tube bundle is subjected to the impact of the working medium and the pressure flowing through the tube bundle, the floating tubesheet will play a supporting role in preventing the vibration of the tube bundle, thereby ensuring the smooth flow of the medium and the safety inside the heat exchanger. During the operation of the heat exchanger, the tube bundle will expand due to heating and contract after cooling. This kind of thermal expansion and contraction will generate huge stress on the tube bundle, which is prone to cracking and deformation. The floating tube sheet can move up and down, allowing the tube bundle to freely expand and contract with temperature changes, thereby offsetting the stress generated by the tube bundle. Avoiding fatigue damage and leakage of the tube bundle can increase the fluid dynamic interaction between the tube bundle and the shell, and improve the heat transfer efficiency of the heat exchanger. Floating tube sheets are widely used in various types of heat exchangers, especially in fluids with high convective heat transfer coefficients, and their effects are more pronounced. When designing a heat exchanger, parameters such as the length, width, thickness, and floating rod length of the floating tube plate need to be selected according to specific circumstances to ensure the stability and efficiency of the heat exchanger.     2. Fixed tube sheet Fixed tube sheet also known as tube fixing fixture. It is a device used to fix and protect pipeline systems. It can ensure the stability and safety of pipeline systems. It is usually used to fix tube plate heat exchangers, and the two end tube plates are connected and fixed to the shell by welding. The structural feature is that a tube bundle is installed in the shell, and the two ends of the tube bundle are fixed on the tube plate through welding or expansion joint. The tube plates at both ends are directly welded to the shell, and the inlet and outlet pipes on the shell side are directly welded to the shell. The flange at the outer edge of the tube plate head is fastened with bolts, and the inlet and outlet pipes on the tube side are directly welded to the head. Several baffles are set inside the tube bundle according to the length of the heat exchange tube. The tube side of the heat exchanger can be divided into any number of channels through a diaphragm.   Fixed tube sheet heat exchangers have the advantages of simple structure, low manufacturing cost, convenient cleaning, multiple tube passes, double shell passes, and wide specification range, and have been widely used in engineering. It is difficult to clean the shell side. Not suitable for dirty or corrosive media. If the expansion difference is large, we can install an expansion joint on the shell to reduce the thermal stress caused by the temperature difference on the shell side. It has the advantages of small bypass seepage, less use of forgings, low cost, no internal leakage, and a heat transfer volume 20%~30% larger than that of floating head heat exchangers.    

What is a flange? A flange is mainly used for connecting parts between pipelines and valves, between pipelines, and between pipelines and equipment, which play a sealing role. Because there are many applications between these equipment and pipelines, two planes are connected by bolts, and the connecting parts with sealing function are all called flanges. Generally, flanges have circular holes for fixing purposes. For example, when used at pipeline connections, a sealing ring is added between two flange plates, and then bolted together. flanges with different pressures have different thicknesses and use different bolts. The main materials used for flanges are carbon steel, stainless steel, and alloy steel, etc.     The difference between stainless steel flange and carbon steel flange Both stainless steel and carbon steel belong to the category of steel, but they are fundamentally different because they contain different other elements. Generally, steel that only contains carbon is called carbon steel, while stainless steel contains other alloy materials, and its corrosion resistance and wear resistance are very good. The main differences between the two are as follows: 1. Density difference: The density of carbon steel is slightly higher than that of ferritic and martensitic stainless steel, and slightly lower than that of austenitic stainless steel. 2. Different compositions: Stainless steel is the abbreviation of stainless and acid resistant steel. Steel that is resistant to weak corrosive media such as air, steam, water, or has rust resistance is called stainless steel; And the type of steel that is resistant to chemical corrosion media (such as acid, alkali, salt, etc.) is called acid resistant steel. Carbon steel is an iron carbon alloy with a carbon content ranging from 0.0218% to 2.11%. Also known as carbon steel. Generally, it also contains small amounts of silicon, manganese, sulfur, and phosphorus. 3. Different corrosion resistance. Carbon steel flanges are prone to oxidation and corrosion, and are not corrosion-resistant; Stainless steel flanges have better corrosion resistance due to their high proportion of elements such as chromium and nickel. 4. Different high temperature resistance performance. Carbon steel flanges are prone to failure in high temperature environments; Stainless steel flanges can effectively resist thermal expansion and deformation at high temperatures. 5. Different resistances: The resistivity increases in order of carbon steel, ferrite, martensite, and austenitic stainless steel. 6. Different coefficients of expansion: The order of linear coefficients of expansion is also similar, with austenitic stainless steel having the highest coefficient and carbon steel having the lowest. 7. Magnetic differences: Carbon steel, ferritic and martensitic stainless steel have magnetism, while austenitic stainless steel has no magnetism. However, when it undergoes martensitic transformation during cold work hardening, magnetism will be generated. Heat treatment can be used to eliminate this martensitic structure and restore its non-magnetism.     Advantages and disadvantages of carbon steel and stainless steel flanges Carbon steel flanges are relatively inexpensive and have high tensile strength, making them commonly used in some low-pressure situations. However, carbon steel flanges have poor corrosion resistance and are prone to rusting in humid or acidic environments. Stainless steel flanges are relatively expensive, but they have good corrosion resistance and can maintain stable performance in high-temperature and high-pressure environments. However, the tensile strength of stainless steel flanges is weak and needs to be selected according to specific usage scenarios.     The use of carbon steel and stainless steel flanges Carbon steel flanges are suitable for general low-pressure water, gas, and oil pipelines and are an economical choice. However, regular maintenance is required during use to prevent rusting. Stainless steel flanges are suitable for high temperature and high pressure applications, such as chemical, petroleum, pharmaceutical, and food industries. Stainless steel flanges can withstand high pressure and temperature, and have corrosion resistance, which can maintain their original performance for a long time.     When choosing carbon steel or stainless steel flanges, it is necessary to choose according to the specific usage environment and requirements. In general low-pressure situations, carbon steel flanges can be chosen as an economical option, but regular maintenance is required. In high-temperature and high-pressure production environments, it is necessary to choose stainless steel flanges with good corrosion resistance to ensure the normal operation of the product.    

What is a lap joint flange? A lap joint flange, also known as a loose flange, is a type of flange that is used to connect two separate sections of pipe or fittings together. It consists of two main components: the stub end and the backing flange.   Lap joint flange is mainly used to cover the flange on the pipe by stub end. The flange can move on the pipe end, and the stub end is the sealing surface. The function of the flange is to press them tightly. Therefore, due to being blocked by the stub end, the loose flange will not come into direct contact with the medium. LJ flange is commonly used in situations where the medium temperature and pressure are not high but the medium is highly corrosive. When the medium is highly corrosive, the part of the flange in contact with the medium (stub end) is made of corrosion-resistant high-grade materials such as stainless steel, while the external part is clamped with flange rings made of low-grade materials such as carbon steel to achieve sealing.   During installation, the stub end is slid onto the pipe or fitting, and the backing flange is aligned with the stub end. The two components are then fastened together using bolts, which are inserted through the bolt holes in the backing flange and tightened. The lap joint allows for rotational movement and adjustment between the two components, providing flexibility in alignment and ease of assembly.     The characteristics of lap joint flanges: 1. Cost savings. When the material of the pipe is special and expensive, the cost of welding flanges of the same material is high. However, when using loose flanges, flanges of the same pipe material can be used with LJ flanges. Therefore, cost savings can be achieved. 2. Easy to construct. Used for situations where it is difficult to align the flange bolt holes during connection, or to prevent changes in the flange bolt holes when replacing equipment in the future. Easy to install for large diameter pipes. 3. Easy to maintain and clean: Due to the simple structure of the LJ flange, installation and disassembly are relatively easy, so its maintenance and cleaning are very convenient. 4. Low installation cost: The manufacturing and installation cost of loose flange is relatively low, and the cost is controllable. 5. Low stress tolerance. 6. Low strength at the welding ring (especially when the thickness is less than 3mm) 7. This type of flange is not allowed to be used in situations suitable for RT testing.       Application scenarios and functions 1.Chemical industry: Loop flanges are widely used in the chemical industry and can be used to connect various chemical pipelines and equipment to ensure the normal operation of chemical production.   2. Oil and Gas Industry: The oil and gas industry requires a large amount of pipeline transportation and storage of oil and gas, and the looped flange is more sturdy compared to other flanges, so it can better ensure safety.   3. Food and Beverage Industry: The production of food and beverages requires the use of a large number of professional equipment. Loop flanges can play a role in connecting pipelines and equipment, and can ensure the safety of product production.       In summary, loop flanges play an irreplaceable role in industrial production, which is required in the production process of different industries. A lap joint flange is a type of flange used to join two sections of pipe or fittings together. It consists of a stub end, which is welded to the pipe or fitting, and a backing flange, which is bolted to the stub end. The lap joint design allows for rotational movement and flexibility during installation, making it suitable for applications where alignment adjustments are needed.  

What is a pipe flange? Pipe flange: a pipe fitting that connects two pipes or equipment. It can be tightly connected to pipelines or equipment through bolts, forming a complete connection. Pipe flanges are widely used in industrial fields such as petroleum, chemical, food, medicine, textile, machinery, etc., The types include weld neck flanges, slip on flanges, blind flange, lap joint flange, spectacle blind flange,spade ring & spacer ring blind flange. They are an important component in pipeline systems.   The functions and uses of pipe flanges mainly include: 1. Connect two pipes with different diameters so that they can be connected together to form a pipeline system. 2. Connect the fittings and valves to ensure a tight fit and achieve a sealing effect. 3. Install pipe flanges on the equipment to secure the pipes and prevent them from moving or falling off. In pipeline design, it is often necessary to use pipe flanges to connect pipes of different lengths to meet engineering requirements. In some mechanical equipment, such as pumps and compressors, pipe flanges are also required to connect components. Overall, pipe flanges are one of the most widely used components in pipeline connections, playing an important role and purpose.       What is a Pressure vessel flange? Pressure vessel flange: It is a specialized flange used to connect pressure vessels and has the characteristics of high pressure and high temperature. It usually consists of a pair of flanges, several bolts, nuts, and a gasket. The sealing surfaces of pressure vessel flanges are divided into flat and concave convex types, which are suitable for different pressure levels and diameter requirements. Its function is to combine different compression components together, while ensuring that there is no leakage at the connecting parts   Pressure vessels are widely used equipment in the industrial field. Due to process requirements, the installation and maintenance of equipment components, and the convenience of manufacturing and transportation, pressure vessels often require detachable structures. As a basic component connecting various pressure vessel components, the design and manufacturing of pressure vessel flanges must comply with relevant standards and specifications to ensure their safe and reliable operation.   When designing pressure vessel flanges, it is necessary to consider the effects of factors such as pressure, temperature, medium, bolt force, and gasket usage. When selecting flange materials, factors such as mechanical properties, corrosion resistance, high temperature resistance, and processing performance need to be considered. At the same time, design work such as strength calculation and fatigue analysis is also required to ensure the strength and reliability of the flange.     In general, pressure vessel flanges are the basic components that connect various pressure vessel components, with characteristics of high pressure and high temperature. They need to be designed and manufactured strictly in accordance with relevant standards and specifications.     There are differences between pipe flanges and pressure vessel flanges in multiple aspects: Structure: Pressure vessel flange is a type of flange with a large diameter and thickness, commonly used to connect pressure vessels and equipment. Its main characteristics are thick structure and high strength. Pipe flange is a small and thin flange, commonly used to connect pipes and fittings. Its main characteristics are lightweight structure and slightly lower strength.   Installation method: When installing pressure vessel flanges, it is generally necessary to use a large jack and achieve sufficient tightening force through prestressing method. The pipe flange is usually tightened with expansion bolts or nuts during installation.     Material: Due to the different usage environment and pressure resistance of the two types of flanges, the material also varies. Usually, pressure vessel flanges need to withstand relatively high pressure, so the materials used will be more durable, such as carbon steel, alloy steel, etc. The material of pipe flanges is generally relatively lightweight, and the materials used are mostly ordinary carbon steel, steel plates, stainless steel, etc.    

Pressure rating of flanges A flange is a component that connects shafts and is used for connecting pipe ends; It is also used for equipment inlet and outlet, for connecting two devices, like the gearbox flange. A flange connection or flange joint refers to a detachable connection formed by a combination of flanges, gaskets, and bolts connected together as a sealing structure. Pipeline flange refers to the flange used for piping in pipeline equipment, and when used on equipment, it refers to the inlet and outlet flanges of the equipment. According to the different nominal pressure ratings of valves, flanges with different pressure ratings are configured in pipeline flanges. Several commonly used flange pressure ratings are classified according to international standards:   According to ASME B16.5, steel flanges have 7 pressure ratings: Class150-300-400-600-900-1500-2500 (corresponding to Chinese standard flanges with PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.4, PN10, PN16, PN25, PN32Mpa ratings)   The pressure rating of the flange is very clear. Class300 flanges can withstand greater pressure than Class150, because Class300 flanges need to be made of more materials to withstand greater pressure. However, the compressive capacity of flanges is influenced by multiple factors. The pressure rating of a flange is expressed in pounds, and there are different ways to represent a pressure rating. For example, the meanings of 150Lb, 150Lbs, 150 #, and Class150 are the same.     Example of pressure level The pressure bearing capacity of flanges varies with different temperatures. As the temperature rises, the pressure bearing capacity of the flange decreases. For example, the Class150 flange has a pressure capacity of 270PSIG at room temperature, 180 PSIG at 400 ℉, 150 PSIG at 600 ℉, and 75 PSIG at 800 ℉.   In other words, when the pressure drops, the temperature is allowed to rise, and vice versa. Due to the fact that flanges can be manufactured from different materials, such as stainless steel, cast iron, ductile iron, carbon steel, etc., each material has a different pressure rating.   The following figure is an example of an NPS12 (DN300) flange. As you can see, the diameter of the flange inner hole and raised surface are the same. However, the outer diameter of the flange, the diameter of the bolt hole center circle, and the diameter of the bolt hole increase with the increase of pressure level.   The number and diameter of bolt holes are: CL 150-12 x 25.4; CL 300-16 x 28.6; CL 400-16 x 34.9; CL 600-20 x 34.9; CL 900-20 x 38.1; CL 1500-16 x 54; CL 2500-12 x 73       Pressure and Temperature Rating - Example Pressure temperature rating refers to the allowable working gauge pressure (pressure unit in Bar) of a material and grade at the rated temperature (degrees Celsius). For intermediate temperatures, linear insertion method is allowed to determine. However, insertion between flange levels is not allowed. If the bolts and gaskets of the flange joint meet the relevant limiting conditions, and the alignment and assembly of the flange joint comply with good regulations, then such a flange joint can be suitable for the rated pressure temperature value. If the latter is used for flange joints that do not meet these limiting conditions, the user is responsible.   The rated temperature corresponding to the rated pressure refers to the shell temperature of the pressure vessel for flanges and flange fittings. In general, this temperature is the same as the temperature of the stored fluid. The responsibility for selecting pressure ratings based on the temperature of the stored fluid is borne by the user. When the temperature is below -29 ℃ (-20 ℉), the rated value should not exceed the rated value at -29 ℃ (-20 ℉).

Flammable and explosive high-pressure pipelines in petrochemical industry require weld neck flanges Petrochemical pressure pipeline components are used to connect or assemble pressure bearing and sealed pipeline system components, including pipes, fittings, flanges, gaskets, fasteners, valves, joints, hoses, traps, filters, separators, etc. Among them, flammable and explosive high-pressure pipelines require forged weld neck flanges.   Seals for flammable and explosive high-pressure pipelines in petrochemical industry include flange sealing surfaces, flange gaskets, and fasteners. The flange sealing surface forms include flat face (FF), raised face (RF), ring joint face (RTJ), tenon groove, special groove, etc. The flange gasket includes flat gasket, spiral wound gasket (with inner and outer rings), and metal gasket (oval, octagonal).     High quality butt welded flanges should meet the following requirements: 1.No defects such as cracks, shrinkage, slag inclusion, and cold-lap; 2.The depth of rust, dents, and other mechanical damage should not exceed the negative deviation of wall thickness allowed by the product standard; 3.The machining accuracy and roughness of threads, sealing surfaces, and grooves should meet the requirements of the design documents or product standards; 4.The weld seam should be well formed and smoothly transition to the base metal, without defects such as cracks, lack of fusion, and incomplete penetration; 5. Metal bellows expansion joints, spring supports and hangers, and other shipping parts or positioning pin blocks should be complete and free of looseness.       The compliance of flanges, blind flanges, and stub end can be determined through the following visual inspections: a) The sealing surface should be flat and free of rust and radial scratches; b) The outer edge of the flange and flange cover should have a permission mark; c) The product standard number, nominal size, nominal pressure, material, and sealing surface type code should match the quality certificate.       Standard class rating of flanges According to the different nominal pressure ratings of valves, flanges with different pressure ratings are configured in pipeline flanges. Several commonly used flange pressure ratings are classified according to international standards According to ASME B16.5, steel flanges have 7 pressure ratings: Class150-300-400-600-900-1500-2500 (corresponding to Chinese standard flanges with PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.4, PN10, PN16, PN25, PN32Mpa ratings)

What is a weld neck flange? A WN flange is a type flange that is to be butt-welded to the pipe or fittings it is being attached to. It has a long tapered hub that transitions smoothly to the pipe or fitting, providing a strong and reliable connection. The welding neck flange has a circular shape with a raised face or a ring-type joint face on the sealing surface. It features a neck or a hub that extends from the flange body, which provides reinforcement and added strength. The inner diameter of the flange matches the inner diameter of the pipe, ensuring a smooth flow of fluids or gases without causing turbulence or additional pressure drop.       The characteristics of neck welded flanges Superior strength and resistance to deformation: The welded connection between the flange and the pipe or fitting creates a permanent bond, eliminating the risk of separation or leakage under high-pressure or high-temperature conditions. The extended neck of the flange also provides extra support and reduces stress concentration on the joint, enhancing the overall structural integrity. 2. Excellent sealing performance: The welded neck flange design is unique, leaving a certain gap between the two flange plates during connection, which can form a very strong seal when using sealing gaskets. This sealing performance is more reliable than other flange connection methods and can be used in harsh environments such as high temperature, high pressure, strong acid, and strong alkali. 3. Easy to install and disassemble: The design of the neck welded flange makes it easier to install and disassemble, without the need for professional technicians to use special tools. 4. Wide applicability: The neck welded flange can be used in industries such as petroleum, chemical, pharmaceutical, food, water treatment, and shipbuilding.       Application fields of weld neck flanges Welded Neck flanges are suitable for many application areas, including but not limited to the following: 1. Petrochemical industry: pipelines in fields such as oil, natural gas, refining, and fertilizers. 2. Food and beverage manufacturing industry: the production pipeline of industries such as candy, pastries, fruit juice, beer, and soft drinks. 3. Water treatment plant: a pipeline connecting water purification and sewage treatment equipment. 4. Construction industry: underfloor heating, ground source heat pumps, HVAC and other building pipelines.       In summary, a weld neck flange is a circular flange with a long tapered hub that is butt-welded to the pipe or fitting. It provides a strong, leak-free connection and is commonly used in high-pressure and high-temperature applications. The welded joint ensures superior strength and structural integrity in critical piping systems.   When installing a weld neck flange, proper welding techniques and procedures must be followed to ensure a strong and leak-free connection. Precision welding is essential to achieve a high-quality, defect-free weld that can withstand the operating conditions of the system.   As a commonly used pipe connector, neck welded flanges are widely used in industries, construction, tap water, and other fields. Its advantages lie in easy installation and use, good sealing performance, strong pressure resistance, and it is a very reliable pipeline connection method.    

What is slip on flange? Slip on flanges are important components in various industrial applications, providing safe and effective connections between pipelines or fittings. These flanges are designed to slide and weld into place at the end of the pipeline, providing a simple and reliable method of connecting the pipeline system. The slip on flange has a flat sealing surface both inside and outside, which can be easily aligned with the pipeline. Its diameter is slightly larger than the connected pipeline, ensuring a tight and reliable installation. Once in place, weld the flange fillet to the pipeline to form a sturdy and durable connection.       Characteristics of slip-on flange 1. A significant advantage of sliding flange is its ease of installation. Adopting a slip-on design, the flange can be quickly aligned and positioned on the pipeline, thereby reducing the time and effort required for installation. This makes SO flanges the preferred choice for applications that may require frequent disassembly and assembly, such as in maintenance or repair work. 2. Low cost. Compared to other types of flanges, they are usually cheaper and an economical and efficient choice for low-pressure or non critical applications. Simplified installation processes also contribute to overall cost savings. 3. Limited. Although slip on flanges have advantages, there are also limitations that should be considered. Due to welding requirements, they may not be suitable for high-pressure or high-temperature applications that require stronger and safer connections. The fillet weld used to connect flanges to pipelines may create potential weak points or areas prone to corrosion. The correct welding technique and material selection are crucial for ensuring the integrity and strength of the joint.       Application scenarios of slip-on flanges 1. Connecting pipelines: Slip on flanges are usually used to connect different pipes or connect the two ends of pipes. They provide strong support and sealing for pipelines, making industrial production safer and more efficient. 2. Connect the valve: Valves are important elements for controlling fluids. SO flanges can be used together with valves, allowing the valve to be inserted into the pipeline and tightly connected to it, ensuring the stability and safety of the pipeline and valve, and reducing the risk of leakage through sealed connections. 3. Connect the pump: A pump is a device that draws or pumps liquid. Slip-on flanges can be used to tightly connect pumps to pipelines or other equipment, ensuring effective and safe fluid transfer between pipelines and pumps, and avoiding risks such as leakage. 4. Other uses: In addition to the above applications, Slip on flanges can also be used to connect other industrial equipment such as heaters, heat exchangers, filters, and containers, as well as in building structures such as fire doors and radiators.       In summary, slip on flanges provide a convenient and cost-effective solution for pipeline connections in various industrial applications. They are easy to install, cost-effective, and suitable for low voltage or non critical systems. However, it is necessary to consider the specific requirements of the application and ensure appropriate welding practices to ensure reliable and durable connections. It is widely used and can be applied in various industries such as metallurgy, machinery, chemical industry, petroleum, machine tools, water conservancy, construction, engineering, shipbuilding, environmental protection, coal, agricultural machinery, food, boilers, and pressure vessels.  

The function of blind flanges Blind flange, also known as blank flange, is a type of flange used to close the end of pipelines or containers. It is a solid disk with no openings or holes in the center. Blind flanges are typically used for the following purposes:   1. Closure: When a section of a pipeline needs to be closed off temporarily or permanently, a blind flange is installed at the end to fully seal it. This helps to prevent flow through pipelines and ensure the integrity of the system. 2. Adjust the flow rate and isolate the medium: When it is necessary to control or isolate the medium flow in the pipeline, blind flanges can play a role in flow regulation. 3. Inspection and testing: Blind flanges are commonly used for pressure testing, leakage testing, or visual inspection of pipeline systems. They provide a sturdy barrier that allows for safe and controlled testing without any fluid leakage. 4. Convenient for maintenance and repair: Due to its detachable nature, blind flanges are very useful in pipeline systems that require maintenance, cleaning, or overhaul. 5. Future expansion: In the event of additional pipeline sections being added in the future, blind flanges can be used as temporary closures until expansion occurs. It provides a convenient and safe way to seal the end of the pipeline until it is ready for connection. 6. Aesthetics and safety: Blind flanges can be used for aesthetic purposes when it is necessary to cover or hide the end of the pipeline. They also provide a safety measure to eliminate the risk of accidental entry or injury by sealing unused or open pipe ends. 7. Reduce production costs: In water or gas supply systems, the use of blind flanges can isolate or adjust parts of the pipeline that do not need to be used as needed, thereby reducing construction and maintenance costs.     During the use of blind flanges, the following points should be noted: 1. Ensure the sealing effect: The sealing performance of blind flanges is related to the safety of pipeline systems and the risk of environmental pollution. To ensure good sealing performance, correct installation, and firm fastening of the selected blind flange, in order to achieve a good sealing effect. 2. Choose a suitable blind flange based on pipeline pressure: According to the pressure level of the pipeline system, select the correct pressure level and size of blind flanges to ensure the safety and effectiveness of using blind flanges. 3. During installation, avoid damaging the pipeline: During the installation of blind flanges, extra caution should be taken to avoid human damage to the pipeline, which may lead to system leakage. 4. Regular inspections: Regularly inspect the installation of blind flanges, including sealing effectiveness and sealing performance.     Application scenarios of blind flanges in different industries 1. Industries such as petroleum, chemical, liquefied gas, and natural gas. In these industries, blind flanges are typically used for pipeline maintenance or on pipelines that require sealing when not used for fluid or gas transmission during a certain period of time. Blind flanges can prevent fluid or gas leakage, ensuring work safety while also avoiding environmental impact. 2. Pressure vessels. In pressure vessels, blind flanges are usually used to temporarily seal the inlet and outlet diameters for repair or accessory replacement work. 3. Food, pharmaceutical and other industries. Blind flanges can also be used in pipeline systems in industries such as food and medicine, especially when it is necessary to rotate or replace pipelines.     Blind flanges have multiple materials to choose from to meet specific requirements of pipeline systems, including carbon steel blind flange, stainless steel blind flanges, alloy steel BL flange, and other alloys blank flanges. They are manufactured in different sizes and pressure ratings to match the size and rating of the corresponding pipes.