| Centrifuging |
Vacuum Dehydration |
| Must heat oil to 80 C for efficient removal of impurities & water |
Water is removed from oil below 55 C. |
| Heating oil depletes additives. |
No additive depletion. |
| Must be used off-line. All related machinery must be stopped to drain oil into barrels / tanks for cleaning. |
Can be used on-line, is therefore user-friendly. |
| Aerates oil, thus increasing net oxygen supply & depleting anti-oxidation additive. |
No aeration. No additive depletion. |
| Cannot remove emulsified water. Gear pumps used in centrifuging increase emulsification. ; |
Easy & total removal of free & emulsified water / moisture. |
| Cannot remove low molecular weight oxidised oil fraction |
Removes |
| Cannot remove dissolved gases like Ammonia / Nitrogen. |
Removes |
| Cannot remove solid impurities below 10 micron, efficiently. |
In conjunction with Electrostatic-oil Cleaners, removal efficiency is better than 0.01 micron. |
| High energy consumption. |
Low |
| Many high speed moving parts requiring frequent maintenance |
Only two pumps. Vacuum & discharge & slow moving parts. |
| |
Automatic water discharge. |
