A blind flange is a type of pipe flange used to seal the end of a piping system, pressure vessel, or valve opening. Unlike standard flanges, it does not have a bore (center hole), making it ideal for isolating or terminating pipelines.
Common Applications
✔ Pipeline Termination – Seals the end of a pipe system.
✔ Pressure Vessel & Boiler Access – Allows inspection or cleaning.
✔ Isolation During Maintenance – Blocks off sections for repair.
✔ Future Expansion – Temporarily seals unused connections.
Types of Blind Flanges
| Type | Description |
|---|---|
| Flat Face (FF) | Smooth sealing surface, used with flat gaskets. |
| Raised Face (RF) | Slightly raised surface for better sealing. |
| Ring-Type Joint (RTJ) | Uses a metal ring gasket for high-pressure applications. |
| Threaded Blind Flange | Has internal threads for screwing onto pipes. |
Standards & Specifications
- ASME B16.5 (Standard for pipe flanges up to 24″)
- ASME B16.47 (Large-diameter flanges)
- API 6A (For wellhead & Christmas tree equipment)
- EN 1092-1 (European standard)
Post time: Dec-19-2025