DIN 2637 Stainless Steel 316 304 Weld Neck Flange WNRF Raised Face PN100 Size DN10 To DN350 in High Pressure Environment

DIN 2637 Carbon Steel and Stainless Steel Weld Neck Flanges WNRF PN100 for Industrial Purposes

Introduction:

We are Shaanxi Peter International Trade Co., Ltd., a reputable and well-established company of rich experience in the industry. As your reliable supplier, we have been providing high-quality DIN WELD NECK FLANGES for more than 20 years in the industry.

DIN weld neck flanges are a type of pipe flange that is designed to be butt-welded to the end of a pipe. They have a long tapered hub that gradually merges with the pipe, providing reinforcement and reducing stress concentrations. The flange is then bolted to another weld neck flange or a compatible flange using bolts or studs.

DIN standards are widely used in Europe, particularly in Germany, and DIN weld neck flanges conform to the specific dimensional and technical requirements set by DIN standards. These flanges are available in various materials such as carbon steel, stainless steel, and alloy steel, allowing them to be used in a wide range of applications in industries such as oil and gas, petrochemical, power generation, and more.

Description of DIN Weld Neck Flanges:

The DIN weld neck flange is indeed widely regarded as a popular and preferred flange type due to its exceptional features and benefits. It offers a superior and seamless connection through direct butt welding to pipes, making it highly reliable and suitable for high-pressure environments. The extended neck provides added strength and durability, while the weld connection ensures a secure and leak-proof joint.

The tapered neck design of the weld neck flange helps distribute stress evenly, reducing the risk of localized stress concentration and potential failure. The smooth transition from the flange's neck to the pipe's bore promotes improved flow characteristics, minimizing turbulence and pressure drop within the system.

In addition to its performance advantages, the weld neck flange's extended neck also facilitates easy inspection and maintenance activities, enhancing its practicality and accessibility.

DIN 2637 Weld Neck Flange Dimensions:

1.Dimensions are in millimeters(mm).

2.Dimensions can be specified by different purchasers.

Materials of DIN Weld Neck Flanges:

DIN weld neck flanges are available in various materials to suit different applications and operating conditions. The material selection for DIN weld neck flanges depends on factors such as temperature, pressure, corrosion resistance, and compatibility with the conveyed fluid or gas.

Grades of Carbon Steel:

ASTM A105: This is a common grade of carbon steel used for weld neck flanges. It is a forged carbon steel specifically designed for high-temperature service and offers excellent weldability and toughness.

ASTM A350 LF2: LF2 is a low-temperature carbon steel grade commonly used for weld neck flanges in applications where low-temperature toughness is required.

ASTM A694 F52/F60/F65/F70: These grades are high-yield carbon steel materials used for weld neck flanges in applications requiring high strength and impact resistance.

Grades of Stainless Steel:

ASTM A182 F304/F304L: These grades of stainless steel are austenitic and commonly used for weld neck flanges. They offer good corrosion resistance, excellent weldability, and are suitable for a wide range of applications.

ASTM A182 F316/F316L: Similar to F304/F304L, these grades are also austenitic stainless steels with improved corrosion resistance, particularly in chloride environments.

ASTM A182 F321: F321 is an austenitic stainless steel grade containing titanium, which provides enhanced resistance to intergranular corrosion. It is often used for weld neck flanges in high-temperature applications.

ASTM A182 F347: F347 is a stabilized stainless steel grade with the addition of niobium, which improves its resistance to intergranular corrosion. It is commonly used for weld neck flanges in applications involving elevated temperatures.

Advantages of DIN Weld Neck Flanges:

DIN weld neck flanges are widely recognized for their superior connection and are commonly utilized in larger sizes and higher pressure classes. Their unique design, with a neck extension and weld bevel, allows for a strong and reliable connection to pipes through butt welding.

The weld neck flange's extended neck provides several advantages, including:

Strength and Durability: The welded neck extension provides additional strength to the flange, making it suitable for high-pressure applications. The weld connection ensures a secure and leak-free joint, enhancing the overall durability of the flange.

Stress Distribution: The tapered neck design of the weld neck flange helps in distributing the stress evenly across the flange and pipe, reducing the risk of localized stress concentration and potential failure.

Enhanced Flow Characteristics: The smooth transition from the flange's neck to the pipe's bore minimizes turbulence and pressure drop, allowing for improved flow characteristics in the system.

Easy Inspection and Maintenance: The extended neck of the weld neck flange allows for easier visual inspection and access for maintenance activities such as cleaning, inspection, and repairs.

Disadvantages of DIN Weld Neck Flanges:

While weld neck flanges offer numerous advantages, there are a few limitations and disadvantages to consider when using them:

Cost and Complexity: Weld neck flanges tend to be more expensive compared to other flange types. The additional cost is primarily due to the welding process involved in their installation. Welding requires skilled labor, specialized equipment, and additional time, making the overall installation process more complex and time-consuming compared to flanges that utilize gaskets or other sealing methods.

Rigidity and Stress Concentration: Weld neck flanges have a rigid structure due to the welded connection, which can lead to stress concentration. This rigidity can cause a localized increase in stress at the weld joint, potentially resulting in fatigue or stress-related failures, especially in dynamic or cyclic loading conditions. Proper design considerations, such as appropriate reinforcement and stress analysis, are necessary to mitigate these issues.

Pipe Alignment Requirements: Weld neck flanges require precise alignment of the pipe and the flange during installation. The welding process requires accurate positioning to ensure a proper fit-up and avoid misalignment, which can lead to welding defects or compromised joint integrity. Achieving precise alignment may require additional time and effort during installation.

Thermal Distortion: Welding heat can cause thermal distortion of the flange and pipe material, particularly in larger sizes or when working with materials that have low thermal conductivity. This distortion can introduce misalignment or dimensional changes, affecting the overall fit and performance of the flange connection. Proper welding techniques and post-welding procedures, such as heat treatment or stress relieving, may be required to minimize thermal distortion.

Limited Swivel Capability: Unlike slip-on or lap joint flanges, weld neck flanges do not offer swivel capability. Once welded to the pipe, the flange is fixed in its position, making it difficult to rotate or adjust the flange orientation. This limitation can pose challenges during installation or maintenance activities that require flange repositioning.

Applications of DIN 2637 Weld Neck Flanges:

DIN 2637 weld neck flanges are specifically designed for use in specific applications where their unique characteristics are required. Here are some common applications of DIN 2637 weld neck flanges:

High-Pressure Systems: DIN 2637 weld neck flanges are often used in high-pressure systems, such as in oil and gas pipelines, chemical plants, and power generation facilities. Their robust construction and reliable sealing capabilities make them suitable for withstanding high pressures and preventing leaks.

High-Temperature Environments: These flanges are also commonly employed in applications where elevated temperatures are involved, such as in steam lines, heat exchangers, and thermal power plants. DIN 2637 weld neck flanges can withstand high temperatures without deformation or loss of integrity.

Petrochemical Industry: The petrochemical industry extensively uses DIN 2637 weld neck flanges due to their ability to handle corrosive fluids and gases. They are commonly used in refineries, chemical processing plants, and offshore platforms, where resistance to corrosion and durability are essential.

Pipelines: Weld neck flanges are commonly used in pipeline systems to connect pipes and provide a secure and leak-proof joint. DIN 2637 weld neck flanges are utilized in various pipeline applications, including oil and gas transmission pipelines, water and wastewater pipelines, and industrial piping systems.

Shipbuilding: Weld neck flanges, including DIN 2637, are prevalent in shipbuilding applications. They are used in various systems on ships, such as fuel and oil transfer lines, cooling systems, and hydraulic systems. The weld neck flanges provide a reliable connection that can withstand the demanding conditions at sea.

Food and Beverage Industry: DIN 2637 weld neck flanges made from stainless steel are suitable for applications in the food and beverage industry. They are used in processing equipment, such as tanks, pumps, and pipelines, where hygiene and corrosion resistance are critical.