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What are the key components of a blind flange

2023-11-04

The key components of a blind flange include:

1. Flange Body: The main body of the blind flange is a flat, solid disc with a circular outer perimeter. It provides the structural support and sealing surface for the flange.

2. Bolt Holes: Blind flanges have evenly spaced holes around the outer edge of the flange body. These holes allow for the attachment of bolts to secure the flange to the open end of a pipe or equipment.

3. Facing: The facing is the sealing surface around the bolt holes. Blind flanges can have different types of facing, such as raised face (RF), flat face (FF), or ring type joint (RTJ), depending on the specific application and sealing requirements.

4. Gasket Surface: The facing serves as the contact point for a gasket, which is placed between the blind flange and the mating flange or equipment to create a seal. The gasket surface should be smooth and even to ensure an effective seal.

5. Raised Face (Optional): Raised face blind flanges have a raised ring around the bolt holes. This raised portion provides a surface for the gasket to compress against, improving the sealing performance.

6. Blind Hole: In the center of the flange, there is a solid, unthreaded hole. This blind hole is where the fluid or gas flow is completely blocked when the blind flange is installed.

7. Bleeder Hole (Optional): Some blind flanges have a small hole, often called a bleeder hole, near the center of the flange. The purpose of the bleeder hole is to release pressure or vent gases trapped in the pipe or equipment when the blind flange is installed. This hole can be plugged or left open as needed.

8. Hub (Optional): In some designs, especially larger blind flanges, a hub may be present. The hub is an extension of the flange body, providing additional support and stability when attaching the flange to the pipe or equipment.

These components work together to create a secure closure when the blind flange is bolted to the open end of a pipe or vessel. The choice of specific components, such as the facing type and the presence of a raised face or a hub, depends on the application and the sealing requirements.

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