DIN/EN Flange Standards
Comprehensive guide to DIN/EN 1092-1 European flange standards. PN pressure ratings, metric specifications, and applications for European and global industrial systems.
DIN/EN Standards Overview
DIN History
DIN (Deutsches Institut für Normung) developed German national industrial standards. These standards have become the basis for European standardization through EN (European Norm) adoption.
Modern DIN standards are typically published as DIN/EN standards, representing alignment between German national and broader European specifications.
DIN/EN 1092-1
Flanges and Their Joints - Part 1: Circular Flanges for Pipes
Pressure System:
PN (Pressure Nominale) ratings in bar
Size Range:
DN (Diameter Nominale) metric designations
Global Adoption:
Primary standard in Europe, Asia, and worldwide
Key Difference: PN vs Class
DIN/EN uses PN (Pressure Nominale) system while ASME/ANSI uses Class system. Both define maximum working pressure but at different reference temperatures:
PN Pressure Ratings
DIN/EN PN ratings represent nominal pressure in bar at 20°C reference temperature.
| PN Rating | Bar Pressure | PSI Equivalent | Typical Applications |
|---|---|---|---|
| PN 6 | 6 bar | 87 PSI | Very low pressure, gravity-fed systems |
| PN 10 | 10 bar | 145 PSI | Low pressure water and utility service |
| PN 16 | 16 bar | 232 PSI | Standard industrial applications |
| PN 25 | 25 bar | 363 PSI | General industrial piping |
| PN 40 | 40 bar | 580 PSI | High-pressure industrial systems |
| PN 63 | 63 bar | 914 PSI | Very high pressure applications |
| PN 100 | 100 bar | 1450 PSI | Ultra-high pressure systems |
| PN 160 | 160 bar | 2320 PSI | Critical high-pressure service |
| PN 250 | 250 bar | 3625 PSI | Maximum pressure applications |
| PN 400 | 400 bar | 5800 PSI | Extreme pressure specialized systems |
DIN Flange Types
DIN/EN 1092-1 covers multiple flange types similar to ASME but with European design optimization.
Type 01: Plate Flange
Simple flat plate without neck. Economical option for low-pressure applications.
Equivalent to ASME slip-on or blind for low pressure
Type 05: Weld Neck
Integral neck with tapered section. Highest pressure-handling capacity and preferred for critical service.
Equivalent to ASME weld neck flange
Type 11: Threaded Flange
Internal threads for connection to threaded pipe. No welding required for installation.
Equivalent to ASME threaded flange
Type 13: Lap Joint
Back-face has hub for easy removal. Commonly used in systems requiring frequent disassembly.
Equivalent to ASME lap joint flange
Type 21: Socket Weld
Compact design with socket for small-bore high-pressure applications. Fillet welded connection.
Equivalent to ASME socket weld flange
Type 24: Blank Flange
Solid flange without center opening. Used to seal pipe ends or unused connections.
Equivalent to ASME carbon flange
Metric vs Imperial Sizing
DIN Metric (DN)
DN (Diameter Nominale) designations use metric sizing based on approximate bore diameter in millimeters.
- DN 10 = ~10mm bore (approximately 3/8")
- DN 50 = ~50mm bore (approximately 2")
- DN 100 = ~100mm bore (approximately 4")
- DN 500 = ~500mm bore (approximately 20")
ASME Imperial (NPS)
NPS (Nominal Pipe Size) designations use inch-based sizing. Same bore concepts, different measurement system.
- 1/2" NPS = 0.5 inch nominal
- 2" NPS = 2 inch nominal
- 4" NPS = 4 inch nominal
- 20" NPS = 20 inch nominal
DIN vs ASME Comparison
Key differences between DIN/EN and ASME standards and how to use them together.
| Aspect | DIN/EN | ASME |
|---|---|---|
| Pressure System | PN (bar-based) | Class (PSI-based) |
| Size System | DN metric | NPS imperial |
| Flange Types | Type 01, 05, 11, 13, 21, 24 | Blind, weld neck, slip-on, etc. |
| Primary Region | Europe, Asia | North America, global |
| Reference Temp | 20°C | 100°F (37.8°C) |
| Interchangeability | Can be used together with conversion | Can be used together with conversion |
Mixed Standards Projects
Modern global projects often use both standards. Conversion factors and engineering judgment ensure compatibility. DIN PN 16 is roughly equivalent to ASME Class 150, DIN PN 40 to ASME Class 300, and so on. Engineering specifications must clearly state conversion factors and verification procedures when mixing standards.
Related Standards & Resources
Standards Overview
Complete guide to all major flange standards with detailed comparisons.
View All Standards →ASME Standards
Technical guide to ASME B16.5 and B16.47 standards for industrial applications.
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