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Technical Data
EVACUATION OF A CLOSED VESSEL
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The example below, as well as the graph showing the expansion factor (F), are computed assuming that the pump is evacuating a closed, dry vessel. No leaks or presence of moisture have been considered.
The volume of a tank including connecting piping is 750 ft3. Initial atmospheric pressure 760 mmHgA (Torr). Vacuum level required is 24"HgV (150 Torr). The amount of gas to be removed from the vessel can be calculated by using th following formula:
in which...
| Q |
= |
total amount of air to be removed |
| V |
= |
volume of reservior plus connecting piping |
| P1 |
= |
initial pressure |
| P2 |
= |
required pressure |
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When using the graph, enter horizontal scale at 150 Torr and read expansion factor (F) 1.62 on vertical scale.
The total amount of air to be removed to reduce the pressure inside the vessel from atmospheric pressure to a vacuum level of 24"HgV is 750 x 1.62 = 1215 ft3. If evacuation is required in three (3) minutes, the average pump capacity should be:
1215/3 = 405 ACFM
Select a pump with this capacity. |
Copyright © 2005 Dekker Vacuum Technologies, Inc.
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