YK11-0016-DI-002-08
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2.5 Pump Performance
2.5.1 Ultimate Pressure
The ultimate pressure of the mechanical booster pump change greatly depending upon the
ultimate pressure of the backing pump.
Special care is necessary when a backing pump other than the standard combination is used. If
the ultimate pressure rises, it is necessary to measure the ultimate pressure of the backing pump,
too.
Note that the Pump exhausted a lot of water or left keeping the inlet/outlet opened to the air long
time might have the water attached inside and have a trouble in lowering the ultimate pressure to
the specified value just after started operation. Such a trouble shall be mostly resolved by keeping
running light the unit whole day and night as the attached substances would evaporate again and
return to the normal condition.
2.5.2 Pumping Speed
The pumping speed of the mechanical booster pump changes depending on the inlet pressure.
Also, the pumping speed of the mechanical booster pump fluctuates depending on the difference
of the inlet port/the outlet port pressure of the mechanical booster pump during operating.
An increase of pumping speed of the backing pump allows the inlet port/the outlet port pressure
difference to lessen.
As a result, the pumping speed of the area on the atmospheric pressure side becomes larger due
to the pressure which the maximum speed of the mechanical booster pump comes out. Reversely,
upon the pumping speed of the backing pump being small, the pumping speed of the mechanical
booster pump becomes small.
When the mechanical booster pump is used in combination with a backing pump other than the
standard one (rotary pump or water sealing pump), it is necessary to examine its pumping
performance to see if the required pumping speed and ultimate pressure can be obtained.
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