Flange Standards and Rating Selection Guide ASME EN GB Comparison

Flange Standards Overview

Flange design, manufacturing, and inspection must follow strict international and national standards. Understanding different standard systems is crucial for proper flange selection.

ASME Standards (American)

• ASME B16.5: NPS 1/2 to 24
• Pressure Classes: 150, 300, 600, 900, 1500, 2500
• Face Types: RF, FF, RTJ, MFM

EN Standards (European)

• EN 1092-1: Main European steel flange standard
• Pressure Ratings: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100
• Various flange types and sealing faces

GB Standards (Chinese)

• GB/T 9115-9119: Various flange types
• Pressure Ratings: PN2.5 to PN160

Pressure Rating Comparison

• Class 150 approximately PN20 (20 bar)
• Class 300 approximately PN50 (50 bar)
• Class 600 approximately PN110 (110 bar)
• Class 1500 approximately PN260 (260 bar)

Flange Facing Types

1. Raised Face (RF): Most common, medium-low pressure
2. Flat Face (FF): Low pressure applications
3. Ring Type Joint (RTJ): High pressure and temperature
4. Male-Female (MFM): Good sealing performance
5. Tongue-Groove (TG): Best sealing for hazardous media

Material Selection

• Carbon Steel: General applications
• Stainless Steel: Corrosive media
• Alloy Steel: High temperature and pressure
• Duplex Steel: Seawater and chloride environments

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