Watson-Marlow Bredel 265 - Manual (Page 34)

OPERATION
34
7.2.3 Performance graph Bredel 2100:
7.3 Dry running
Dry running is a running condition of the pump when no
process flow (pumped product) is flowing through the
pump. The Bredel peristaltic pumps are very suitable for
dry running.
Dry running does impose an additional thermal load on
the pump hose, because the internal heat associated
with repetitive hose compression is normally removed
by convection of the process fluid. So dry running
increases the wear of the hose. The magnitude of the
thermal load depends on the size and running speed of
the pump as well as the amount of shims mounted on
the rotor. To minimize the extra wear, it is advised to
minimize the dry running periods.
28.0
32.0
36.0
24.0
20.0
16.0
12.0
8.0
4.0
0.0
0 5 10 15 20 25 30 35 40 45
12000 24000 36000 48000 60000 72000 84000 96000 108000
Pump Speed [rpm]
Capacity [l/h]
Required Motor
Power [kW]
Intermittent Duty
Continuous Duty
40
50
60
70
80
Product
Temperature [ °C]
100 kPa =1 bar
500 kP
a
750 kP
a
1000 kP
a
1600 kP
a
WARNING
Do not apply dry running in combination
with a flammable process fluid. In case of
doubt, consult your Bredel representative.