10 Types of Flanges and Their Applications in Industrial Piping
Understanding flange types is essential for proper piping system design.
1. Weld Neck Flange (WN)
Best for high-pressure and high-temperature. Long tapered hub, butt weld connection. Common in oil refineries, power plants.
2. Slip On Flange (SO)
Cost-effective for low-medium pressure. Slides over pipe, welded both sides. Water treatment, HVAC applications.
3. Blind Flange (BL)
Pipeline termination, pressure testing. Solid disk, no bore. Reusable for testing.
4. Socket Weld Flange (SW)
Small diameter high-pressure piping. Counterbore accepts pipe. Sizes 1/2 to 2 inch.
5. Threaded Flange (TH)
No-welding applications. NPT/BSP threads. Instrument connections, utility lines.
6. Lap Joint Flange (LJ)
Frequent disassembly. Used with stub end. Flange rotates for bolt alignment.
7. Ring Type Joint (RTJ)
Extreme high-pressure oil & gas. Metal-to-metal seal. Class 900-2500.
8. Expander Flange
Connecting different pipe sizes. Larger flange than pipe OD.
9. Reducing Flange
Size reduction in piping. Smaller bore than flange OD.
10. Orifice Flange
Flow measurement. Orifice plate ready with pressure taps.
Standards
ASME B16.5 (North America), DIN EN 1092-1 (Europe), JIS B2220 (Japan), GOST 12820-80 (Russia/CIS)
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