Dry Running - Bredel 40-100 Operating Manual

Performance graph Bredel 100
Required motor power in kW (HP)
18.0 (24.13)
16.0 (21.44)
14.0 (18.77)
12.0 (16.08)
10.0 (13.40)
8.0 (10.72)
6.0 (8.04)
4.0 (5.36)
2.0 (2.68)
Pump speed [rpm]
Capacity [L/h]
Capacity [USGPM]
7.4

Dry running

Dry running is a running condition of the pump when no fluid is flowing through the hose. Bredel
hose pumps allow dry running for limited periods.
Dry running imposes an additional thermal load on the 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, as well as the rotor type (low pressure
or medium pressure).
To minimise the extra wear, it is advisable to minimise dry running periods to less than a minute at a
time.
44
0
10 20
24000
12000
105.7
52.8
Capacity per revolution: 20.0 l/rev
Bredel 100
Intermittent Duty
100 kPa = 1 bar
Continuous Duty
30 40
36000 48000
158.5 211.3
Product
temperature
°C (°F)
40 (104)
50 (122)
60 (140)
70 (158)
80 (176)
50
60000
264.1
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