The reliability of a flange gasket depends on bolt preload, the condition of the sealing surfaces, and gasket compression—not simply on increasing its thickness.
1. Load Path
The bolt spacing determines the uniformity of the clamping force.
- Calculate the prestress
- Check for Undervoltage at the Edge
- Avoid Local Overpressure
2. Sealing Surface
Scratches and warping can create pathways for leaks.
- Control Flatness
- Deburring
- Leave sufficient margin around the hole
3. Material Cross-Section
The material hardness should be appropriate for the medium and temperature.
- Set the compression window
- Avoid using gaskets that are too thin
- Verify Media Compatibility
4. Assembly Verification
Verify the structure under actual pressure conditions.
- Tighten in sequence
- Perform a pressure hold test
- Inspect and Remove Indentations
FAQ
1. Does tightening a bolt more ensure a better seal?
No, excessive preload can damage the gasket or deform the flange.
2. Can poor flatness be compensated for with soft rubber?
Limited; if the design scope is exceeded, the shell structure will still need to be modified.