Operating manual liquid ring vacuum pumps and compressors series TRH - TRS - TRM - TRV - SA & Systems type HYDROSYS - OILSYS
28
drain (or collecting container). Before start-up fill the pump to the shaft centreline, separator and piping of system with
service liquid through pump inlet flange or fill connection ITEM 28. Check all components for leakage.
If the automatic drain valve ITEM 48 is installed, the overflow valve ITEM 24 must be closed after the filling.
CAUTION!
Possible contact with hazardous media, cold or warm, and pump surfaces, cold or warm.
During the following operations it is particularly important to avoid contact and/or inhale of possible spilled
liquid (vapour): therefore all safety precautions must be taken. Operate only provided with apposite protective
devices.
Start all accessories (temperature switches, level switches, pressure switches, etc.) open cooling and flushing lines.
Start the pump and open the service liquid valve ITEM 3 (if applicable), soon after start the circulating pump ITEM 22 (if
applicable)
and adjust the service liquid flow (see tab. 7).
Gradually open the valve at gas suction side till the required vacuum level is reached.
Check the system for abnormal conditions (see chapters 12 and 16).
If the system is fitted with a circulating pump and/or the service liquid has an excessive pressure the by-pass valve
ITEM 13A (if available) or valve ITEM 13 can be adjusted to reduce the service liquid flow to the vacuum pump and/or
optimise the thermodynamic efficiency of the heat exchanger ITEM 9.
NOTE:
HYDROSYS systems engineered with multiple pumps are fitted with isolating valves at suction, discharge,
and service liquid lines of each pump. When one or more pumps are not operating it is required to isolate the
idle pump(s) by closing these valves. When the pumps are put back into service the said valves (at suction
and discharge) must be opened.
11.2 - OPERATION
After starting the vacuum pump check the following:
- the vacuum level is as desired or adjust the flow regulating valve to the required vacuum
- flow and temperature of service liquid and/or cooling liquid are as expected (within 25% tolerance)
- motor does not draw more amperage than shown on its nameplate
- the pump-motor assembly does not have abnormal vibrations and noises such as cavitation
- there are no leaks from mechanical seals, joints and flushing or cooling liquid lines
- liquid level in separator is between the minimum and the maximum.
- the operating temperature at full load, does not exceed approximately 85°C
CAUTION!
Never run the pump dry.
CAUTION!
Possible contact with warm surfaces. Operate only provided with apposite protective devices.
If the gas discharge is not open to the immediate atmosphere but it is piped to other locations, the pump discharge
should be checked for back-pressures that could cause higher power consumption and loss of pump capacity
.
11.3 - SHUT DOWN
DANGER!
Danger due to collision, crushing or harm. Wait for the complete pump stopping before handling the unit.
Take precautionary measures by draining the pump or closing the pipes by mean of a valve. Operate only
provided with apposite protective devices.
First close the service liquid flow and cooling liquid flow (if applicable) then shut down the circulating pump ITEM 22 (if
there is one).
Where possible, gradually decrease the vacuum level to 400/900 mbar in about 10 seconds max or, if compressor,
decrease the discharge pressure. The discharged service liquid from pump ITEM 4 helps producing a slow deceleration
rather than sadden stop
.
Turn off the power to motor ITEM 6 and close any accessories and flushing lines.
Make sure the non return valves ITEM 2, or similar, at suction and discharge lines are leak tight.
Should the system be idle for an extended period of time it is recommended to disconnect the electricity to the motor
panel, drain all liquids from pump, separator and piping. Refer to chapter 6 for storage procedures.
11.4 -
START UP OF “OILSYS” SYSTEMS
CAUTION!
Possible contact with warm media and warm surfaces. Operate only provided with apposite protective
devices.
(In the following, reference is made to certain ITEM numbers which are listed in the figures and legend of chapters 12.1
and 19).
Open the valve at the gas discharge, if applicable, and partially close the valve at the suction side.
Close draining valve ITEM 11 and valves for condensate recovery ITEMS 13F and 13L which are on the frame
separator ITEM 1B; open the valve ITEM 13D which is between the circulating pump ITEM 22 and the frame separator
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