6.2.3 Abrasive fluids
Do not exceed the maximum permissible solids content specified in the data sheet.
When the pump handles liquids containing abrasive substances, increased wear of all
components in contact with the fluid handled is to be expected. In this case, reduce
the intervals commonly recommended for servicing and maintenance.
6.2.4 Flow rate
Unless specified otherwise in the characteristic curves or in the data sheets, the
following applies:
▪
Short-time operation: Q
min
6)
=0.05xQ
opt
7)
▪
Continuous operation: Q
min
=0.3xQ
opt
▪
Continuous operation: Q
max
8)
=1.2xQ
opt
The data refer to water and water-like fluids.
6.2.5 Ambient temperature
Observe the following parameters and values during operation:
Table 11: Permissible ambient temperatures
Permissible ambient temperature
Value
Maximum
80 °C
Minimum
-20 °C
9)
CAUTION
Operation outside the permissible ambient temperature
Damage to the pump (set)!
▷
Observe the specified limits for permissible ambient temperatures.
6.2.6 Viscosity of the fluid handled
The discharge head, flow rate and power input of the pump are influenced by the
viscosity of the fluid handled.
The pump set can be installed either in horizontal or vertical position.
If the values of kinematic viscosity during operation differ from those in the data
sheet, check the pump selection.
For vertical installation (motor on top) make sure that the fluid handled has a
kinemetic viscosity < 15 mm
2
/s during pump start-up. The pump will then be self-
venting.
For fluids with higher viscosities, the motor space must be primed/vented manually
(see connections in the general arrangement drawing) or draining of the rotor space
must be prevented by appropriate measures at the site.
6.2.7 Frequency inverter operation
The pump set is suitable for frequency inverter operation as per IEC 60034-17.
When selecting the frequency inverter, check the following details:
▪
Data provided by the manufacturer
▪
Electrical pump data, particularly the rated current
6)
Minimum permissible flow rate
7)
Best efficiency point
8)
Maximum permissible flow rate
9)
Lower temperatures on request
6 Commissioning/Start-up/Shutdown
32 of 60
Etaseco/Etaseco I
Summary of Contents for Etaseco C
Page 59: ......
