Socket Weld Flange

A socket weld flange is a type of flange that is welded onto pipes for a durable and strong connection. It has a recessed area, or socket, where the pipe is inserted, and then welded around the outer perimeter. This type of flange is typically used for smaller piping systems or systems with high pressure and temperature conditions. Socket weld flanges are popular in industries such as oil and gas, chemical processing, and petrochemicals. They offer benefits like easy installation, strong connection, and leak-proof sealing.

Material Grades

Stainless Steel: ASTM / ASME SA403 GR WP “S” / “W” / “WX” 304, 304L, 304H, 309, 310H, 316L, 316H, 317, 317L, 321, 321H, 904, 904L, 347, 347H.

Duplex Steel: ASTM / ASME SA815 UNS NO. S31803, S32205, S32550, S32750, S32760.

Carbon Steel: ASTM / ASME A234 WPB, WPC, ASTM / ASME A860 WHY42, WHY46, WHY52, WH60, WPHY65 & WPHY70

Alloy Steel : ASTM / ASME A234 WP1, WP5, WP9, WP11, WP 12, WP22, WP23, WP91

Sizes

Socket weld flanges are typically used for smaller pipes. The common sizes include:

• Nominal Pipe Size (NPS): Generally ranges from ½ inch to 4 inches.
• Diameter and Thickness: The specific dimensions of the flange, including outside diameter (OD) and thickness, vary according to the pressure class and nominal size.

Pressure Ratings

Socket weld flanges are designed to handle high-pressure systems. They are categorized into different pressure classes, indicating the maximum pressure the flange can withstand:

• Class 150 (PN 20)
• Class 300 (PN 50)
• Class 600 (PN 100)
• Class 900 (PN 150)
• Class 1500 (PN 250)
• Class 2500 (PN 420)

Each class is designed to withstand a specific maximum pressure at a given temperature. Higher classes indicate higher pressure capabilities.

Conclusion

When selecting a socket weld flange, consider the appropriate standard, material grade, size, and pressure rating for your specific application. Adherence to ASME/ANSI, MSS, or ISO standards ensures compatibility, safety, and reliability in piping systems. Socket weld flanges are particularly suited for smaller diameter and high-pressure applications, offering a robust and leak-resistant connection.