Geoscience Reference
In-Depth Information
EXAMPLE 2.57
Problem: Convert 40 psi to feet head.
Solution:
40 psi
1
ft
0.433 psi
×
= 92 .
ft
EXAMPLE 2.58
Problem: Convert 40 ft to psi.
Solution:
40 ft
1
0.433 psi
1ft
×
=
17.32 psi
As the above examples demonstrate, when attempting to convert psi to feet we divide by 0.433,
and when attempting to convert feet to psi we multiply by 0.433. The above process can be most
helpful in clearing up confusion about whether to multiply or divide; however, there is another
approach that may be easier for many operators to use. Notice that the relationship between psi and
feet is almost 2 to 1. It takes slightly more than 2 feet to make 1 psi; therefore, in a problem where
the data are provided in pressure and the result should be in feet, the answer will be at least twice as
large as the starting number. For instance, if the pressure were 25 psi, we intuitively know that the
head is over 50 feet, so we must divide by 0.433 to obtain the correct answer.
EXAMPLE 2.59
Problem: Convert a pressure of 45 psi to feet of head.
Solution:
45 psi
1
1ft
0.433 psi
×
=
104 ft
EXAMPLE 2.60
Problem: Convert 15 psi to feet.
Solution:
15 psi
1
1ft
0.433 psi
×
=
34.6 ft
EXAMPLE 2.61
Problem: Between the top of a reservoir and the watering point, the elevation is 125 feet. What will
the static pressure be at the watering point?
Solution:
125 psi
1
1ft
0.433 psi
×
=
288.7 ft
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