Pompetravaini TRSK 2002/1, Operating Manual, Page: 19 / 32

Operating manual liquid ring vacuum pumps TRVK - TRSK
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10 - CHECK LIST PRIOR TO START-UP
If pump is designated to be used in environments subjected to the application of the ATEX 99/92/CE
directive or the pump is provided with a nameplate indicting the ATEX stamp, it strictly forbidden proceed
to start up the pumps but necessary to consult POMPETRAVAINI for clarifications.
All questions listed below must have POSITIVE answers prior to proceeding to the pump start-up.
Please note that the following is a partial list. Special installations may require further precautions
therefore, additional safety steps must be taken as the cases dictate.
- This manual has been completely read, including the following chapters, and is understood in its entirety?
- The piping system has been flushed of any foreign particles, welding impurities, etc.?
- Have all piping and pump obstruction been removed?
- All connections and piping are leak proof and there are no external forces or moments applied to the piping
or pump flanges?
- Pump and motor are properly lubricated, per instructions?
- Pump/motor alignment has been checked?
- Mechanical seal flushing line has been connected, where required?
- All valves in the installation are in the correct position?
- All safety guards are in place?
- Pump direction of rotation has been checked by jogging the motor?
- The pump Stop switch is clear and visible?
- Pump as well as installation are ready for start-up?
11 - STARTING, OPERATING AND STOPPING PROCEDURES
Upon receipt and/or completion of installation, before turning on the power to the electric motor, rotate the pump shaft by
hand to make sure that the pump rotor is free. In the event the shaft does not turn, try to free it up by applying a torque to
the pump coupling with a pipe wrench.
In the event the pump does not become free with the above procedures, fill up the pump with a suitable solvent or
lubricating liquid, let it rest for several hours to allow softening of the rust build-up inside the pump, drain the pump and
apply torque to the pump shaft as described above to finally free the rotor.
NOTE: The selected solvent or lubricating fluid must be compatible with the pump, seals and gasketing materials.
CHECK PUMP-MOTOR COUPLING ALIGNMENT!
This must be done prior to the first start-up and before every start-up if pump or motor has been removed
from the installation for maintenance or other reasons (see chapter 7.2).
Prior to starting the pump verify that all auxiliary components are available, ready for use and, where required, they are
in the open position (i.e.: double mechanical seals are pressurised with buffer liquid, cooling liquid to heat exchanger is
open, etc.) and the pump bearings are lubricated.
If the gas and/or service liquid temperatures are in the dangerous levels, it is recommended to insulate the pump, piping
and separator to avoid direct contact with their surface, avoid freezing, thermal shock or loosing heat energy.
11.1 - START-UP
Open valve at gas discharge if installed and partially open the valve at the suction side.
When pump is fitted in a partial recovery or total recovery or HYDROSYS systems, as built by POMPETRAVAINI, it is
required to have drain valve at separator in the closed position, flow regulating valve and overflow valve in the open
positions. Separator overflow valve should be piped to 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. Check all
components for leakage.
NOTE:
If a separator tank is installed, please pay attention that service liquid will flow from the overflow valve: so it is
necessary to provide for a proper pipe to receive adequately the outlet of such liquid.
If the automatic drain valve is installed, the overflow valve must be closed after the filling.
Start all accessories (temperature switches, level switches, pressure switches, etc.) open cooling and flushing lines (see
chapter 13.3).
Start the pump and open the service liquid valve, soon after start the circulating pump and adjust the service liquid flow.
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 14).
If the system is fitted with a circulating pump and/or the service liquid has an excessive pressure the by-pass valve or
regulating valve can be adjusted to reduce the service liquid flow to the vacuum pump and/or optimise the thermodynamic
efficiency of the heat exchanger.
A gauge located at the service liquid suction port of the pump will have to indicate a pressure between 0.2 and 0.4 bar
more than that of the gas discharge (generally atmospheric pressure).