Civil Engineering Reference
In-Depth Information
Fig. 10.4
Set of curves for a given pump
The volume flow rate can be calculated by multiplying the fluid velocity
(typical values for water and air are 2-3 and 5-10 m/s) by the pipe section
(m
2
). The mass flow rate is equal to the volume flow rate multiplied by the
fluid density (kg/m
3
).
If other types of pumps are involved, consult the manufacturer for instructions.
it follows that the power
P
required at the shaft of pumps is
P
¼
q
H
ρ
g
=
g
c
ð
Þ
q
H
ρ
g
=
g
c
ð
Þ
0
:
0226
ðÞ
ðÞ
η
η
where
q ¼
volume flow rate (m
3
/s)
(gpm)
H¼
total head
¼H
static
+
H
losses
(m)
(ft)
ρ¼
density of the fluid (kg/m
3
)
(lb/gallon)
η¼
pump efficiency
g ¼
gravitational acceleration 9.81 m/s
2
32.17 ft/s
2
s
2
s
2
1kg
m
=
lb
ft
=
g
c
¼
conversion factor
¼
32
:
17
N
lbf
