Watson-Marlow APEX10 - Manual (Page 30)

OPERATION
30
7.3.3 Performance graph APEX20:
7.4 Dry running
Dry running is a running condition of the pump when no
fluid is flowing through the pump. Bredel peristaltic
pumps are very suitable for dry running.
Dry running imposes an additional thermal load on the
pump hose, because a part of the internal heat
associated with repetitive hose compression is normally
removed by the process fluid. So dry running increases
the wear on the hose. The thermal load depends on the
running speed of the pump, the hose size (10, 15, 20
mm) as well as the rotor type (low pressure or medium
pressure). To minimise the extra wear, it is advisable to
minimise dry running periods.
0,00
0,10
0,20
0,30
0,40
0,50
0,60
0,70
0 20 40
40
50
60
70
80
60 80 100 120 140
0 175 350 525 700 875 1050 1225
Pump Speed [rpm]
Capacity [L/h]
Required Motor Power [kW]
0 kP
a 300 kP
a 600 kP
a 800 kP
a
Intermittent Duty
Continuous Duty 100 kPa =1 bar
Product
temperature
(°C)