Page 126 - Water and wastewater engineering

INTAKE STRUCTURES 3-23

h a

1 h s

Datum

2 h s

1 NPSH A h h h h vpa
fs
a
s
or
h a 2 NPSH h h h h vpa
a
fs
A
s
FIGURE 3-15
Nomenclature for NPSH A .

TABLE 3-7
Atmospheric pressure as a function of altitude
Atmospheric pressure
Altitude, m kPa m of water

1,000 113.9 11.62
500 107.5 10.97
0 101.3 10.33
500 95.46 9.74
1,000 89.88 9.17
1,500 84.56 8.66
2,000 79.50 8.11
2,500 74.69 7.62
3,000 70.12 7.15
Adapted from COESA, U.S. Standard Atmosphere, U.S.
Government Printing Office, Washington, D.C., 1976.