Environmental Engineering Reference
In-Depth Information
Solution
:
82.2 lb/ft
3
× (1 ft
3
/7.48 gal) = 10.99 lb/gal
30 gal/min × 1440 min/day × 10.99 lb/gal = 474,768 lb/day
■
Example 2.60
Problem
: A pump delivers 26 gpm. How many pounds of water does the pump
deliver in 1 minute? How many pounds per minute will the pump deliver if the liquid
weighs 73.7 lb/ft
3
?
Solution
:
26 gal/min × 8.34 lb/gal = 216.84 lb/min
73.7 lb/ft
3
× 1 ft
3
/7.48 gal = 9.853 lb/gal
26 gal/min × 9.853 lb/gal = 256.18 lb/min
■
Example 2.61
Problem
: A pump delivers 16 gpm. How many pounds of water does the pump
deliver in 24 hours? How many pounds per day will the pump deliver if the liquid
weighs 8.3 lb/gal?
Solution
:
16 gal/min × 1440 min/day × 8.34 lb/gal = 192,153.6 lb/day
16 gal/min × 1440 min/day × 8.3 lb/gal = 191,232.0 lb/day
■
Example 2.62
Problem
: Compare the density of chlorine gas with the density of air. Chlorine gas
weighs 0.187 lb/ft
3
. Standard density of air is 0.075 lb/ft
3
.
Solution
:
0.187 lb/ft
3
÷ 0.075 lb/ft
3
= 2.49
Because chlorine gas is 2.5 times heavier than air, it will always seek the lowest
space when spilled.
f
loW
Flow is expressed in many different terms (English system of measurements). The
most common flow terms are
•
Gallons per minute (gpm)
•
Cubic feet per second (cfs)
•
Gallons per day (gpd)
•
Million gallons per day (MGD)
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