Tuthill KLRC Series, Руководство оператора

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14 Manual 4804 Rev C p/n 004804 0000
CAUTION
!
Standard pumps with stainless steel
impellers (designated with material codes F
or C) are suitable for operation with sealant
temperatures up to 160°F (71°C). Bronze
impeller pumps (designated with material code
B) and pumps with “HT” following the model
designation on the nameplate are suitable
for operation with sealant temperatures to
220°F (104°C). Operation with sealant at higher
temperatures reduces internal clearances and
will cause the pump to fail.
The pump performance curves are shown on the
KLRC Series data sheets, which can be viewed
at http://www.vacuum.tuthill.com.The temperature
of the sealant is a major factor in determining
the base pressure, and in
À
uences the pumping
speed. At lower temperatures the pump capacity
increases, and at higher temperatures the pump
capacity decreases. The temperature/ef
¿
ciency
ratio is not linear and the most pronounced effect is
at low pump pressures.
When the pump is supplied with sealant water
directly from a water main, the water-regulating
valve must be adjusted so that the water enters
the pump casing in the order of zero-gauge
pressure. If, however, the pump operates at a
holding pressure above 400 Torr (533.28 mbar),
the sealant water pressure should be increased
to about 7 PSIG. It is generally not recommended
to run a liquid pump with the suction open to
atmosphere for any period of time, as the pump
will heat up due to the inability to draw in sealant to
dissipate the heat.
STARTING THE PUMP
If the pump has been idle for an extended period of
time, turn the pump by hand prior to energizing the
motor to determine that the impeller is free to turn.
PRE-START CHECKS
1. Check that the proper electrical power is
connected to the control panel via the fusible
disconnect.
2. Check that the sealant water supply to the
vacuum system is adequate in terms of
À
ow
rate, temperature, and supply temperature.
3. Check that the proper sized inlet and outlet
piping is connected to the vacuum system.
Flexible connectors should be used between
the pumps and piping to prevent external
stresses from being applied to the equipment.
On large-diameter piping, pipe supports should
be used to prevent the weight of the piping
from stressing the equipment.
4. Fill the separator tank (if applicable) of the
liquid ring pump with the correct sealant liquid
to the level that corresponds appropriately to
the shaft level of the liquid ring pump. At no
time should the liquid level be allowed to drop
below the sealant outlet connection, which
would allow gas to enter the suction of the
circulation pump. Maximum sealant level would
coincide with the top of the liquid ring pump
bearing housing.
OPERATION
04