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Example of Finding Pump Air Consumption and Air Pressure at a Specific Fluid Delivery and Discharge Head:
To supply 60 gpm (227 liters) fluid flow (horizontal scale) at 40 psi (0.28 MPa, 2.8 bar) discharge head pressure (vertical scale) re-
quires approximately 50 scfm (1.40 m
feet
(meters)
280
(85.3)
240
(73.2)
(0.7, 7.0)
200
(61.0)
(0.56, 5.6)
160
(48.8)
(0.42, 4.2)
120
(36.6)
(0.28, 2.8)
80
(24.4)
40
(0.14, 1.4)
(12.2)
0
TEST CONDITIONS
Pump tested in water with PTFE diaphragm and inlet
submerged.
Performance Chart
#
/min) air consumption at 70 psi (0.49 MPa, 4.9 bar) inlet air pressure.
psi
(MPa, bar)
120
A
(0.8, 8)
100
E
B
80
C
60
40
D
20
0
0
15
30
(57)
(114)
INLET AIR PRESSURES
A
120 psi air (0.8, 8 bar)
B
100 psi air (0.7, 7 bar)
C
70 psi air (0.49, 4.9 bar)
D
40 psi air (0.28, 2.8 bar)
F
G
45
60
75
(170)
(227)
(284)
FLUID FLOW GPM (lpm)
KEY
AIR CONSUMPTION
E
20 scfm (0.56 m#/min)
F
40 scfm (1.12 m#/min)
G 60 scfm (1.68 m#/min)
H
80 scfm (2.24 m#/min)
H
90
105
120
(341)
(397)
(454)
FLUID PRESSURE AND FLOW
SCFM AIR CONSUMPTION
308441
31
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