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
- Raised Face (RF): Most common, medium-low pressure
- Flat Face (FF): Low pressure applications
- Ring Type Joint (RTJ): High pressure and temperature
- Male-Female (MFM): Good sealing performance
- 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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