Gas Ballast Function - Ulvac PKS-016 Instruction Manual

(3) Discharge the water in the Pump unit and Cooling water piping in case where the
environment temperature comes down below 5℃ under the state that the operation is
stopped (Supply the compressed air of 0.3MPaG (gauge pressure) through the Cooling
water inlet without closing the outlet.). Residual water, if any, might freeze up and cause
crack of the Pump unit and/or Cooling water pipe.

4.4 Gas Ballast Function

Breathed condensed gas shall be liquefied through the compress process of the Pump,
mixed with the Pump oil and then cycled mixed together inside the Pump unit. This status
brings you the same situation that you used the high steam pressure oil that raises the
ultimate pressure. It also shortens the life cycle of the Shaft seal since the oil lubrication
shall deteriorate.
If introduced the air or dry nitrogen through the gas ballast valve just before the Pump
compression process, the condensed gas is not liquefied but exhausted with the air
through the Exhaust valve.
(1) To use the gas ballast, breathe in the air through the gas ballast valve before sucking
in the condensed gas and operate the Pump around twenty minutes; this is because the
"gas ballast effect" becomes larger as the Pump temperature is higher up to about 70℃.
Wait until the Pump temperature raises enough to open the main valve so as to operate
the Pump. The "gas ballast effect" under low temperature shall be lower than the
specified process performance.
(2) Note further that keeping the gas ballast valve open when not breathing in the
condensed gas shall cause the Pump oil splashing and power loss and further rise the
ultimate pressure. If the Pump doesn't breathe the condensed gas, you have to use the
pump with closing the gas ballast valve.
(3) You have to note also that the condensed gas might remain in the Pump oil after you
have exhausted a lot of condensed gas or exhausted the condensed gas (air or gas that
contains less water or other steam that contaminates the oil) without opening the gas
ballast valve since the process capacity of the condensed gas by the gas ballast valve
is limited. In such a case, close the Main valve, breathe in the air through the gas ballast
valve and idle operate the Pump. Then the oil temperature shall rise up and be cleaned
by means of the Gas ballast effect. Keep on idle operating the Pump without opening
the gas ballast valve as far as the specified ultimate pressure is attained. You need to
replace the Pump oil if it was not cleaned after operated long time.
(4) The water would be collected in the bottom of Oil-tank when the large quantity of water
is sucked into the pump which can't process the condensed gas more than the limit of
capacity.
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YK17-0009-DI-002-05