JIS B2220 Socket Weld Flange

The JIS B2220 socket weld flange is a widely used pipe connection component in industries that follow Japanese Industrial Standards. This flange design offers reliable sealing performance, particularly in medium and high-pressure pipelines where welding integrity and precise alignment are essential.

Below, we’ll explain what makes this type of flange unique, outline typical dimensions, and share some practical considerations for selecting the right configuration for your project.

JIS B2220 Socket Weld Flange

What Is a JIS B2220 Socket Weld Flange?

A socket weld flange has a machined bore with a recess or “socket,” allowing the pipe to be inserted before welding around the perimeter. This differs from slip-on flanges, where the pipe passes completely through the bore. The socket weld method is often preferred for smaller-diameter pipelines or systems where a smooth bore and strong mechanical connection are required.

JIS B2220 defines dimensional and pressure ratings for flanges used in Japan and in many export markets across Asia and the Middle East. These flanges are typically available in nominal sizes from 10A to 1500A and pressure classes such as 5K, 10K, 16K, 20K, and 30K.

Key Features and Benefits:

• Positive Alignment: The socket provides a clear stop for the pipe end, ensuring correct insertion depth and alignment during welding.
• Improved Flow: Because the pipe does not protrude beyond the flange face, internal flow turbulence is minimized.
• Robust Connection: After fillet welding, the joint offers excellent mechanical strength and leak resistance under pressure cycling.
• Compact Design: Compared to weld neck flanges, socket weld flanges require less axial space and are easier to install in tight layouts.

Dimensions and Standards:

When specifying a JIS B2220 socket weld flange, pay close attention to:

• Nominal Pipe Size (NPS) and Bore Diameter: These must match your pipeline OD precisely.
• Pressure Class: Common ratings include 10K (approximately equivalent to PN16) and 16K.
• Facing Type: Most are raised face (RF) or flat face (FF).
• Material Grade: Carbon steel (e.g., S20C, SS400), stainless steel (e.g., SUS304, SUS316), or other alloys depending on medium and temperature.

Below is a simplified dimension example for reference:

Always refer to the official JIS B2220 tables or certified drawings for precise measurements.

How to Select the Right Socket Weld Flange?

Choosing the correct socket weld flange isn’t just about size—it requires matching materials and pressure ratings to your system conditions:

• Medium Compatibility: For corrosive media or higher temperatures, stainless steel grades (SUS304, SUS316L) are recommended over carbon steel.
• Pressure Requirements: Confirm the pressure class corresponds to your pipeline design pressure plus safety factors.
• Welding Considerations: Ensure qualified welders are familiar with socket weld procedures to avoid incomplete fusion or internal crevices.
• Project Standards: Many EPC contractors specify JIS B2220 to align with Japanese or regional regulations—always cross-check compatibility if integrating with ASME B16.5 or EN1092-1 flanges.

Applications:

JIS B2220 socket weld flanges are frequently used in:

• Oil and gas pipelines
• Steam distribution networks
• Chemical processing plants
• Fire protection systems
• Marine and shipbuilding installations

Their compact form and solid mechanical properties make them a practical choice where space and reliability are critical.

Quality Control

• 100% dimensional inspection before dispatch
• Material certification (EN 10204 3.1 or 3.2) available
• Surface finish per project specification
• Non-destructive testing (such as penetrant testing, magnetic particle testing, ultrasonic testing)

Contact Us

Haihao Group manufactures a full range of JIS B2220 socket weld flanges and related fittings, with certifications and inspection records to support your project requirements.

Email: sales@haihaogroup.com