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Engineering ToolBox > Recommended Delivery Flow Velocity of Viscous Liquids
As a rule of thumb the following velocities can be used in design of piping and pumping systems for viscous liquids:
| Pipe Dimension | Viscous Liquids | ||
| inches | mm | m/s | ft/s |
| 1 | 25 | 1 | 3.5 |
| 2 | 50 | 1.1 | 3.6 |
| 3 | 75 | 1.1 | 3.7 |
| 4 | 100 | 1.15 | 3.8 |
| 6 | 150 | 1.2 | 3.9 |
| 8 | 200 | 1.2 | 4 |
| 10 | 250 | 1.3 | 4.5 |
| 12 | 300 | 1.4 | 4.5 |