Flange Facing Types Explained
The flange facing (sealing surface) is critical for creating a leak-tight joint. Different facing types are designed for specific pressure ranges, temperatures, and sealing requirements.
Приподнятое лицо (RF)
Most Common Type
- Raised sealing surface (1.6mm or 6.4mm height)
- Concentric or spiral serrations for gasket grip
- Suitable for Class 150-2500
- Works with soft, semi-metallic, and metallic gaskets
- Приложения: General service, oil and gas, chemical processing
Плоская поверхность (FF)
Full Surface Sealing
- Entire flange face is sealing surface
- Requires full-face gasket
- Limited to Class 150 and Class 300
- Prevents flange bending under bolt load
- Приложения: Low-pressure water, cast iron flanges, plastic-lined systems
Соединение кольцевого типа (RTJ)
High Pressure Metal-to-Metal Seal
- Groove for metal ring gasket (oval or octagonal)
- Metal-to-metal contact for superior sealing
- Suitable for Class 600 and above
- Handles extreme temperatures and pressures
- Приложения: High-pressure steam, oil and gas wellheads, refineries
Мужское и женское лицо (MFM)
Self-Aligning Sealing
- One flange has raised male portion, other has recessed female
- Gasket sits in female recess for better alignment
- Reduced gasket blowout risk
- Приложения: Pump and valve connections, heat exchangers
Tongue-Groove Face (TG)
Premium Sealing Performance
- Tongue on one flange fits into groove on mating flange
- Excellent gasket containment
- Superior sealing for hazardous media
- Higher cost due to precision machining
- Приложения: Toxic gases, high-pressure hydraulic systems
Facing Selection Guide
| Facing Type | Pressure Range | Temperature | Cost |
|---|---|---|---|
| Плоская поверхность (FF) | Low (Class 150-300) | Умеренный | Low |
| Приподнятое лицо (RF) | Medium-High (Class 150-2500) | Wide | Medium |
| MFM | Medium-High | Wide | Medium-High |
| TG | High | Wide | High |
| RTJ | Very High (Class 600+) | Extreme | High |
Gasket Compatibility
- RF/FF: Non-asbestos, graphite, PTFE, spiral wound
- RTJ: Soft iron, stainless steel, Inconel ring gaskets
- MFM/TG: Sheet gaskets, spiral wound with centering ring
Choosing the correct flange facing type is essential for ensuring leak-free operation and optimal sealing performance in your piping system.
WhatsApp: +86-18658777855
Электронная почта: 1007788887@qq.com
Вам также может понравиться
DIN Flanges vs ANSI Flange: ANSI Class 150, PN Rating and Selection Guide
A practical guide comparing DIN flanges and ANSI flange standards, including ANSI Class 150, PN meaning, flange rating ANSI systems, bolt patterns, dimensions and selection tips.
Flange Coupling Guide: Coupling Flange Type, Flanged Coupler and Shaft Applications
A practical guide to flange coupling, coupling flange type selection, flanged coupler structure, flange shaft coupling applications, installation and maintenance.
What Is an Orifice Flange? Orifice in Piping, Orifice Pipe and Flow Measurement Guide
A practical guide explaining what an orifice flange is, how an orifice in piping works, orifice pipe flow measurement, pressure taps, orifice plates and selection tips.