Velocity chart
Flow Velocity
The Flow Velocity in a corrugated metal hose should never exceed 150 ft/sec for gas or 75 ft/sec for liquids. High Velocities can force the corrugations into resonant vibration; this can result in premature failure – such failures can be prevented through the use of an internal liner or change in the nominal size.
The critical speed is mostly influenced by the medium conveyed and its working conditions, the shape of the corrugations and hose bending. (BS EN ISO 10380-2012)
| Media | Configuration | Hose | Maximum Velocity(without liner) ft/sec |
| Liquid | Straight | Braided | 75 |
| Liquid | 45 deg bend | Braided | 60 |
| Liquid | 90 deg bend | Braided | 40 |
| Dry Gas | Straight | Braided | 150 |
| Dry Gas | 45 deg bend | Braided | 115 |
| Dry Gas | 90 deg bend | Braided | 75 |
| Liquid | Straight | Unbraided | 50 |
| Liquid | 45 deg bend | Unbraided | 40 |
| Liquid | 90 deg bend | Unbraided | 25 |
| Dry Gas | Straight | Unbraided | 100 |
| Dry Gas | 45 deg bend | Unbraided | 75 |
| Dry Gas | 90 deg bend | Unbraided | 50 |