23
Conversion Factors
1HP = 33,000 . lbs. per minute
1HP = 42.4 btu per minute
1HP = 0.746 kwhr (kilowatt hours)
1 U.S. gallon = 231 cubic inches
Pipe Volume varies as the square of the diameter;
volume in gallons = 0.0034 D
2
L where:
D = inside diameter of pipe in inches;
L = length in inches
Velocity in feet per sec. =
0.408 x ow (gpm)
D
2
where:
D = inside diameter of pipe in inches
Atmospheric pressure at sea level = 14.7PSI
Atmospheric pressure decreases approximately 0.41PSI for each one
thousand feet of elevation up to 23,000 feet.
Pressure (PSI) = feet head x 0.433 x specic gravity
Specic gravity of oil is approximately 0.85.
ermal expansion of oil is approximately
1 cubic inch per 1 gallon per 10°F rise in temperature.
Hydraulic Formulas
Horsepower =
GPM x PSI
1714
Torque (lb. in.) =
CU IN./REV. x PSI
2
Torque (lb. in.) =
HP X 63025
RPM
Flow (gpm) =
CU IN./REV x RPM
231
Head and Pressure Equivalents
When converting pressure from feet of water to P.S.I., the specic
gravity of the liquid must be considered.
Here are some typical conversion gures:
1 P.S.I.=2.30 feet of water
(specic gravity 1.0)
1 P.S.I.=2.88 feet of oil
(specic gravity 0.8)
teCHnICal Data
PRESSURE AND
CONVERSION TABLE
Feet PSI PSI
Water Oil Water
1 .35 .43
2 .70 .87
3 1.05 1.3
4 1.4 1.73
5 1.75 2.17
10 3.5 4.33
15 5.2 6.5
20 7.0 8.66
25 8.7 10.8
30 10.5 13.0
35 12.2 15.2
40 14.0 17.3
45 15.7 19.5
50 17.5 21.7
55 19.2 23.9
60 21.0 26.0
65 22.7 28.1
70 24.5 30.5
75 26.2 32.5
80 28.0 34.6
85 29.7 36.8
90 31.5 39.0
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