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Pump performance
Ability of pump ability to deliver material is
based on pressure (psi/bar) and quantity
(cfm/lpm) of air supplied to motor and
amount of material discharge backpressure
to be overcome within system.
Pump performance, Fig. 2 contains
curves based on three different air
pressures. Curves relate delivery in ounces
(grams) per minute (X axis) to air
consumption in cubic feet (liters) per minute
(right Y axis) and to material discharge
pressure in psi (bar) (left Y axis).
Pump performance
Delivery versus discharge pressure and air consumption
bar
psi
8000
550
500
7000
450
6000
400
350
5000
300
4000
250
3000
200
150
2000
100
1000
50
Legend:
Δ
Air pressure
– – –
Air consumption
–––––
Material discharge pressure
NLGI 2 grease at 75 °F (25 °C)
150 psi (10.3 bar) ∆
150 psi (10.3 bar)
100 psi (6.9 bar) ∆
100 psi (6.9 bar)
50 psi (3.4 bar) ∆
50 psi (3.4 bar)
0
0
5
10
100
200
300
400
100 psi (6.9 bar)
100 psi (6.9 bar) ∆
50 psi (3.4 bar) ∆
50 psi (3.4 bar)
15
20
25
30
500
600
700
800
Delivery
7
cfm
lpm
40
1100
1000
35
150 psi (10.3 bar)
150 psi (10.3 bar) ∆
900
30
800
25
700
600
20
500
15
400
300
10
200
5
100
Ounces per minute
35
40
123 ounces approximates 1 gallon
Grams per minute
900
1000
1100
840 grams approximates 1 liter
Fig. 2
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