Pompetravaini TRSK 2002/1, Operating Manual, Page: 21 / 32

Operating manual liquid ring vacuum pumps TRVK - TRSK
21
The flow of service water at 15°C, for standard pumps and normal operating conditions at various vacuum levels, is listed
on the specific pump curves
.
Usually the temperature rise of service water, when handling dry air at 20
°
C, is approximately 4 to 8°C.
When condensable (e.g.: vapours) are present in the gas stream the heat load to be removed by the service water will
be higher, therefore the service water temperature rise will be higher.
The service liquid flow and its temperature will affect the pump performance (see chapter 17).
Generally the low service liquid flow will decrease the pump capacity, while a high service liquid flow will increase the
absorbed power by flooding the pump.
Hard service water will generate lime build-up inside the pump. The severity of the deposit will vary with the water
temperature. Lime or mineral deposits on the surface of the internal pump components will cause an increase of absorbed
power, wear of the components and eventually will seize the pump.
It is recommended to monitor the water hardness and, if too high, treat the water. If there are no alternatives, there should
be periodical flushing of the pump with a solution that will remove the specific deposits, or the pump must be periodically
disassembled, cleaned of all incrustations and re-assembled.
Systems with total service liquid recovery require periodical change of the service liquid contained in the closed loop.
The heat exchanger must be kept well cleaned of all mineral deposits for an effective thermodynamic heat exchange.
During operation, a closed loop system will loose some of the service liquid, due to evaporation and/or saturation of the
discharged gases. It will be required to periodically make-up fresh liquid into the system.
Systems that handle condensable will experience a rise in the level of the service liquid in the separator. The excessive
liquid will be overflowed through the overflow valve or connection.
13 - BEARINGS AND MECHANICAL SEALS MAINTENANCE
WARNING: The maintenance must be carried out with the pump turned off and the electrical power, or other
driving mechanism, must be disconnected. The power should only be turned back on by the same
person doing the maintenance. It is however recommended to have at least a team of two workers
doing the maintenance and the supervisors should be fully aware of the work in progress.
CAREFULLY FOLLOW THE SAFETY PROCEDURES LISTED IN CHAPTER 2.
13.1 - BEARINGS
During assembly the bearings are already lubricated with high quality grease with working temperature limits
-20°C +180°C.
The bearings used in a pump normal operating conditions must be carefully cleaned and newly greased after
approximately 2000/2500 working hours using a good lubricating grease quality.
Bearing temperature should not exceed the 85°C during normal working conditions and normal environments.
Bearings can overheat for reasons such as too much grease, misalignment of flexible coupling, wrong bearings, excessive
vibrations, bearing wear. See following table for bearing numbers and type used for each pump.
Tab. 4
PUMP
MODEL
B
ea
ri
ng
,
Dr
iv
e e
n
d
Bearings,
Non drive end
PUMP
MODEL
B
ea
ri
ng
,
Dr
iv
e e
n
d
Bearings,
Non drive end
TRVK 1502/1
NU 216 NU 216 n° 2) 7212AC
TRSK 2002/1
NU 222 n°2) 30222 TRVK 1503/1 TRSK 2004/1
TRVK 2003/1 NU 222 NU 222 n° 2) 30222 TRSK 2005/1
TRVK 2503/1 NU 226 NU 226 n° 2) 30226 TRSK 2502/1
NU 226 n°2) 30226
TRVK 3003/1 NU 230 NU 230 n° 2) 30230 TRSK 3000/1
TRVK 3503/1 NU 234 NU 234 n° 2) 30234 TRSK 3002/1
NU 230 n°2) 30230
TRVK 4003/1 NU 238 NU 238 n° 2) 30238 TRSK 3004/1
TRVK 5003/1 NU 244 NU 244 n° 2) 30244 TRSK 3006/1
TRSK 3500/1
---
NU 234 n°2) 30234 TRSK 3504/1
TRSK 4000/1
TRSK 4002/1
NU 238 n°2) 30238 TRSK 4004/1
TRSK 4504/1
TRSK 5002/1
NU 244 n°2) 30244 TRSK 5004/1
TRSK 5008/1