YK15-0009-DI-002-04
15
2.5.3 Power Requirements
Motive energy to drive the Vacuum pump is a total value of the work of the mechanical
element on the rotary friction (mechanical work) and the work of compressing the air
(compression work) that becomes maximum when the suction pressure is between 3×10
4
~
4×10
4
Pa. If the pressure went down under 10Pa, the compression work becomes smaller, then
most of the motive energy shall be spent on the mechanical work. General use of the Pump shall
indicate the largest load pressure range while the suction pressure was between 3×10
4
~ 4×10
4
Pa.
Operation opening the gas ballast valve would require larger motive energy at all the time as
its compression work is large even the suction pressure was small. (Note: Spec.B and Spec.H
don't have gas ballast function.) Further, when the temperature of the Pump site was low (in
cold district or outdoor installation) starting the Pump would require larger motive energy since
the Pump oil temperature was low and its viscosity is higher. However the motive energy value
shall decrease and come stable as the oil viscosity comes lower while the Pump temperature
shall rise as it goes through operation.
“Motor” listed on the “Table 4” are adopted taking into consideration of the above condition to
drive the Pump.
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