Stainless Weld Neck Flange EN1092-01 PN160 WNRF Flange ASTM A182 304/314/316 In Piping Systems

Stainless Weld Neck Flange EN1092-01 PN160 WNRF Flange ASTM A182 304/314/316 Weld Neck Raised Face in Piping Systems

Description of EN1092-01 Stainless Steel Weld Neck Flanges:

EN1092-01 stainless steel weld neck flanges are available in various grades of stainless steel, such as AISI 304 (1.4301), AISI 316 (1.4401/1.4404), and other specialized alloys. Stainless steel grades are chosen based on factors like corrosion resistance, mechanical properties, and suitability for specific operating environments. These flanges adhere to EN1092-01 standards, ensuring uniform dimensions across manufacturers. Standardized dimensions include outer diameter, bolt circle diameter, bolt hole diameter, and thickness, facilitating interchangeability and compatibility with pipes and equipment.

EN1092-01 categorizes stainless steel weld neck flanges into PN classes ranging typically from PN6 to PN100. Each PN class denotes the maximum pressure at which the flange can operate safely, accommodating a wide range of industrial pressure requirements. Like other weld neck flanges, EN1092-01 stainless steel flanges feature a long tapered neck. This design enhances the flange's structural integrity and promotes even stress distribution along the weld joint. It also reduces the risk of stress concentrations that could lead to mechanical failure under high-pressure conditions.

EN1092-01 stainless steel weld neck flanges offer various sealing surface configurations, such as flat face, raised face, and ring type joint (RTJ). The choice of sealing surface depends on the application's requirements for pressure containment and compatibility with different types of gaskets and sealing materials.

EN1092-01 Stainless Weld Neck Flange Specifications

1.Dimensions are in millimeters(mm).

2. Dimensions can be specified by different purchasers.

Grades of Stainless Steel Weld Neck Flanges:

Stainless Steel Weld Neck Flanges specified by ASTM A182 are widely used in various industries. These flanges are designed to slip over the pipe and are welded both inside and outside to provide a secure and leak-proof connection. The material grades F304, F304L, F316, F316L, and F304H denote specific types of stainless steel, each with unique properties suited for different applications.

ASTM A182 F304:

Composition: Austenitic stainless steel with a nominal composition of 18% chromium and 8% nickel.

Properties: Good corrosion resistance, weldability, and formability. Suitable for general-purpose applications.

ASTM A182 F304L:

Composition: Similar to F304 but with a lower carbon content (max 0.03%).

Properties: Enhanced resistance to intergranular corrosion after welding. Ideal for applications requiring post-weld heat treatment.

ASTM A182 F316:

Composition: Contains 16% chromium, 10% nickel, and 2% molybdenum.

Properties: Superior corrosion resistance, especially against chlorides and other industrial solvents. Suitable for more aggressive environments.

ASTM A182 F316L:

Composition: Similar to F316 but with lower carbon content (max 0.03%).

Properties: Improved resistance to intergranular corrosion. Preferred for welding operations where post-weld annealing is not possible.

ASTM A182 F304H:

Composition: Similar to F304 but with a higher carbon content (0.04%-0.10%).

Properties: Improved high-temperature strength and creep resistance. Suitable for high-temperature applications.

Why We Choose Weld Neck Flanges?

Outstanding Characteristics of Weld Neck Flanges in the Applications:

Weld neck flanges are considered among the strongest types of flanges primarily due to their design features and the nature of their connection method.

Butt-Welded Connection: Weld neck flanges are welded directly to the pipe. The welding process involves fusing the neck of the flange to the pipe's end, creating a continuous and robust connection. This method ensures that the joint is integral and resistant to leakage under high-pressure conditions.

Tapered Hub Design: Weld neck flanges have a long, tapered hub or neck. This design provides several strength advantages:

Reduced Stress Concentration: The gradual taper distributes stress more evenly compared to flat or raised face flanges. This minimizes the risk of localized stress concentrations that could lead to fatigue or failure.

Enhanced Structural Integrity: The extended neck acts as a reinforcement, adding structural strength to the flange and the joint. It helps in bearing the load and resisting bending or deformation.

Smooth Transition: The smooth transition from the flange's neck to the pipe's bore improves flow characteristics within the piping system. This reduces turbulence and pressure drop, which can occur in other flange types with abrupt transitions.

Suitability for High-Pressure Applications: Due to their robust construction and welded connection, weld neck flanges are well-suited for applications requiring high pressure handling capabilities. They provide a secure and reliable sealing mechanism that withstands significant internal pressures without compromising integrity.

Longevity and Reliability: Weld neck flanges are known for their durability and long service life when properly installed and maintained. The welded joint eliminates potential weak points associated with bolted connections, such as gasket failures or bolt loosening over time.

Versatility: Weld neck flanges are available in various materials, sizes, and pressure ratings, making them versatile for a wide range of industrial applications where strong, leak-proof connections are essential.

The Differences Between Stainless Steel and Carbon Steel Weld Neck Flanges:

• Material Composition:

Stainless Steel Weld Neck Flanges: These flanges are made from stainless steel, which contains chromium as a significant alloying element (typically 10% or more). The addition of chromium forms a passive oxide layer on the surface, providing excellent corrosion resistance against rust and oxidation.

Carbon Steel Weld Neck Flanges: Carbon steel flanges primarily consist of iron and carbon, with other elements present in smaller quantities. They may also contain manganese, silicon, and trace amounts of other elements. Carbon steel lacks the chromium content that provides corrosion resistance in stainless steel.

• Corrosion Resistance:

Stainless Steel Weld Neck Flanges: Stainless steel weld neck flanges exhibit superior corrosion resistance compared to carbon steel. They are highly resistant to rust, oxidation, and staining in most atmospheric and marine environments. This makes stainless steel flanges suitable for applications where corrosion resistance is critical, such as in chemical processing, marine industries, and food processing.

Carbon Steel Weld Neck Flanges: Carbon steel weld neck flanges are susceptible to corrosion, especially in humid or acidic environments. They require protective coatings or regular maintenance to prevent rust and corrosion. In highly corrosive environments, carbon steel flanges may be used with corrosion-resistant coatings or linings.

• Mechanical Properties:

Stainless Steel Weld Neck Flanges: Stainless steel weld neck flanges typically have higher tensile strength and yield strength compared to carbon steel flanges. They also exhibit better toughness and ductility, which can be advantageous in applications requiring resistance to mechanical stresses and impacts.

Carbon Steel Weld Neck Flanges: Carbon steel weld neck flanges have good mechanical properties suitable for general-purpose applications. They offer adequate strength and hardness for most industrial processes and are widely used in pipelines, oil and gas refineries, and power plants.

• Cost and Availability:

Stainless Steel Weld Neck Flanges: Stainless steel weld neck flanges are generally more expensive than carbon steel flanges due to the higher cost of raw materials and manufacturing processes. However, their long-term durability and corrosion resistance often justify the higher initial investment.

Carbon Steel Weld Neck Flanges: Carbon steel weld neck flanges are more economical and widely available compared to stainless steel flanges. They are cost-effective for many industrial applications where corrosion resistance is not the primary concern.