Amarex KRT series, Installation And Operating Manual, Page: 51 / 124

6 Commissioning/Start-up/Shutdown
51 of 124
Amarex KRT
CAUTION
Pumping solids-laden fluids at reduced speed
Increased wear and clogging!
▷ Never operate the pump set with flow velocities below approx. 25
in.
/
s
[0.7
m
/
s
] in
horizontal pipes and approx. 45
in.
/
s
[1.2
m
/
s
] in vertical pipes.
Frequency inverter operation of the pump set is permitted in the frequency range
from 30 to 60 Hz.
6.2.4 Fluid handled
6.2.4.1 Temperature of the fluid handled
The pump set is designed for transporting liquids. The pump set is not operational
under freezing conditions.
CAUTION
Danger of freezing!
Damage to the pump set!
▷
Drain the pump set or protect it against freezing.
Refer to the maximum permissible fluid temperature and ambient temperature
indicated on the name plate and/or in the data sheet.
6.2.4.2 Minimum level of fluid handled
CAUTION
Fluid level below the specified minimum
Damage to the pump set by cavitation!
▷
Never allow the fluid level to drop below the specified minimum.
A
B
Fig. 31: Minimum level of fluid handled
Pump sets without cooling system (installation type S)
Pump sets without cooling system are designed for continuously submerged
operation. This condition has to be fulfilled for the motor to be cooled sufficiently.
Ready for operation The pump set is ready for operation as soon as the motor is fully submerged
(dimension A). Exact dimensions see general arrangement drawing/outline drawing.
The pump set can be operated at a lower fluid level for short periods until the
temperature monitoring device of the motor trips. The fluid level must not drop
below the specified minimum (dimension B). Exact dimensions see general
arrangement drawing/outline drawing.