JIS B2220 Flanges Suppliers

JIS B2220 flanges are manufactured with specific face types to ensure proper sealing and compatibility with piping systems. The most commonly used face types include:

1. Flat Face (FF):

   This is the most widely used face type in JIS flanges, especially in low-pressure applications such as 5K and 10K. It ensures full gasket contact and uniform pressure distribution.

2. Raised Face (RF):

   Found mostly in higher pressure classes like 16K and above, RF flanges provide better sealing by concentrating pressure on a smaller gasket area.

3. Tongue & Groove / Male & Female Faces (on request):

   Although rare in JIS B2220, these specialized faces are used where additional sealing security is needed and can be provided on custom order.

Proper selection of the face type is crucial for gasket compatibility, leak prevention, and compliance with system requirements.

JIS B2220 flanges are manufactured in various materials to meet the requirements of pressure ratings (5K to 30K), application environments, and fluid compatibility. The most commonly used materials include:

• Carbon Steel (SS400, S20C):
  • Ideal for 5K, 10K, and 16K pressure classes.
  • Widely used in water pipelines, fire protection, and industrial utilities.
  • Economical and offers good mechanical strength.
• Stainless Steel (SUS304, SUS316):
  • Recommended for corrosion-resistant applications like marine, chemical, and food industries.
  • Compatible with 10K to 20K pressure classes.
  • Excellent resistance to rust, acids, and saline environments.
• Alloy Steel (SCM435, SFVC2A):
  • Used in high-pressure and high-temperature services such as power plants, refineries, and steam systems.
  • Suitable for 20K and 30K ratings.
• Cast Iron (FC200) and Ductile Iron (FCD450):
  • Common in municipal water, HVAC, and fire service lines.
  • Mostly used for 5K and 10K pressure classes.
  • Cost-effective with reasonable strength and machinability.

These materials are selected as per application needs and are fully compliant with JIS standards. Each material offers specific mechanical and chemical properties to suit piping systems operating under different conditions.

JIS B2220 flanges are manufactured with strict dimensional tolerances and inspection standards to ensure proper fitment and pressure integrity in piping systems. These include:

• Dimensional Tolerances:
  • Outer Diameter (OD) and Bolt Circle Diameter (BCD) as per JIS standards ± defined mm range.
  • Bolt Hole Diameter and Pitch Circle Accuracy to avoid misalignment during assembly.
  • Facing Height & Serration Finish: Ensures tight gasket sealing – generally concentric or spiral serration with Ra 3.2~6.3 μm.
• Inspection Criteria:
  • Visual Inspection: For surface defects, machining marks, or warping.
  • Dimensional Inspection: Using calibrated instruments per ISO or JIS gauges.
  • Hydro Testing or Air Leak Testing: As per client specifications or pressure class.
  • Marking Verification: Ensures traceability of heat numbers, material grade, and standard compliance.

These tolerances and quality checks are critical for ensuring leak-proof operation in high-pressure Japanese industrial systems like shipbuilding, chemical, and thermal plants.

The JIS B2220 flange standard, developed for Japanese industrial applications, differs in multiple aspects from international standards like ASME B16.5 (USA) and EN 1092-1 (Europe). Here's a technical comparison:

Conclusion: Interchangeability is not guaranteed. Always match flange standards to piping system design codes to ensure safety and compliance.

JIS B2220 flanges are widely used across various industries in Japan and many Asia-Pacific countries due to their compatibility with regional standards and operational efficiency. These flanges are commonly preferred in:

• Petrochemical & Refining Plants – For pipelines handling medium pressure systems (5K to 30K).
• Water Treatment & Distribution – Due to the availability of low-pressure options like 5K and 10K.
• Shipbuilding & Marine Applications – Japan being a global leader in marine engineering, JIS flanges are integral to piping layouts.
• Industrial Machinery & Equipment – Where Japanese-origin machinery or design drawings mandate JIS standards.
• Pharmaceuticals & Food Processing Units – Where the clean surface finish and precision alignment of JIS flanges are essential.

Why they are preferred:

• Full compliance with Japanese Industrial Standards (JIS) ensures uniformity in design.
• Easy availability of JIS-rated components across Asian markets.
• Cost-effective for low to medium pressure applications.
• Compatibility with Japanese and Asian-manufactured valves and pipes.