Pipe Fitting Standards Explained: ASME, DIN, JIS, GB Comparison
Understanding Pipe Fitting Standards
Global piping projects require understanding multiple fitting standards. ASME (American), DIN/EN (European), JIS (Japanese), and GB (Chinese) standards each have unique specifications for dimensions, pressure ratings, and materials.
Songhai Flange manufactures fittings to all major international standards. This guide helps you navigate the differences and ensure proper specification for your projects.
ASME Standards (American)
ASME B16.5 – Pipe Flanges and Flanged Fittings
The primary North American flange standard.
- Size range: 1/2″ to 24″ NPS
- Pressure classes: 150, 300, 400, 600, 900, 1500, 2500
- Temperature ratings vary by material
ASME B16.9 – Factory-Made Wrought Butt Weld Fittings
Covers elbows, tees, reducers, caps, and stub ends.
- Size range: 1/2″ to 48″ NPS
- Wall thickness: SCH 10S through XXS
ASME B16.11 – Forged Fittings
Socket weld and threaded fittings.
- Size range: 1/8″ to 4″
- Pressure classes: 2000, 3000, 6000, 9000 PSI
DIN/EN Standards (European)
DIN 2501 / EN 1092-1 – Flanges
European flange standard replacing older DIN standards.
- Size range: DN 10 to DN 4000
- Pressure ratings: PN 2.5, 6, 10, 16, 25, 40, 63, 100
JIS Standards (Japanese)
JIS B2220 – Steel Pipe Flanges
Japanese flange standard widely used in Asia.
- Size range: 10A to 1500A (roughly 3/8″ to 60″)
- Pressure ratings: 5K, 10K, 16K, 20K, 30K, 40K, 63K
JIS K Rating Equivalent:
- 5K ≈ 150#
- 10K ≈ 150#-300#
- 16K ≈ 300#
- 20K ≈ 400#
- 30K ≈ 600#
GB Standards (Chinese)
GB/T 9112-9124 – Steel Pipe Flanges
Chinese national flange standards.
- Size range: DN 10 to DN 4000
- Pressure ratings: PN 2.5, 6, 10, 16, 25, 40, 63, 100, 160
Standard Comparison Table
| Parameter | ASME | DIN/EN | JIS | GB |
|---|---|---|---|---|
| Size Designation | NPS (inches) | DN (mm) | A (mm) | DN (mm) |
| Pressure Rating | Class (150-2500) | PN (2.5-160) | K (5K-63K) | PN/Class |
| Flange Faces | RF, FF, RTJ | RF, FF, RTJ | RF, FF, RTJ | RF, FF, RTJ |
Pressure Class Equivalents (Approximate)
| ASME Class | DIN/EN PN | JIS K | GB PN |
|---|---|---|---|
| 150 | PN20 | 10,000 | PN20 |
| 300 | PN50 | 16K/20K | PN50 |
| 600 | PN110 | 30,000 | PN110 |
| 900 | PN150 | 40K | PN150 |
| 1500 | PN260 | 63K | PN260 |
Material Specification Equivalents
Carbon Steel
- ASME: A105, A216 WCB, A234 WPB
- DIN: P235GH, P265GH, 1.0460
- JIS: SFVC2A, SFVC2B
- GB: 20#, Q235, 16Mn
Stainless Steel 304
- ASME: A182 F304/F304L
- DIN: 1.4301 / 1.4307 (X5CrNi18-10)
- JIS: SUS304 / SUS304L
- GB: 06Cr19Ni10 / 022Cr19Ni10
Stainless Steel 316
- ASME: A182 F316/F316L
- DIN: 1.4401 / 1.4404 (X5CrNiMo17-12-2)
- JIS: SUS316 / SUS316L
- GB: 06Cr17Ni12Mo2 / 022Cr17Ni12Mo2
Conclusion
Understanding pipe fitting standards is essential for global projects. While ASME, DIN, JIS, and GB have differences, proper cross-referencing ensures compatible, safe piping systems.
Songhai Flange manufactures fittings to all major international standards with full certification and traceability. Our engineering team can help you navigate standard requirements for your specific project.
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