UNITS OF MEASURE ENGINEERING DATA
EQUIVALENT VALUES OF PRESSURE
1 in. of Mercury (hg) = 1.13 ft. of water
Inches of Mercury
Pounds per Sq. In.
Inches of Mercury
Pounds per Sq. In.
Inches of Mercury
Pounds per Sq. In.
Feet of Water
Feet of Water
Feet of Water
1 2 3 4 5 6 7 8 9
1.13 2.26 3.39 4.52 5.65 6.78 7.91 9.04
0.49 0.98 1.47 1.95 2.44 2.93 3.42 3.91 4.40 4.89
11 12 13 14 15 16 17 18 19 20
12.45 13.57 14.70 15.82 16.96 18.09 19.22 20.35 26.47 22.60
5.39 5.87 6.37 6.86 7.35 7.84 8.33 8.82 9.31 9.80
21 22 23 24 25 26 27 28 29
23.78 24.88 26.00 27.15 28.26 29.40 30.52 31.65 32.80
10.3 10.8
11.28 11.75 12.25 12.73 13.23 13.73 14.22
10.17 11.30
10
29.929
33.947
14.6969
WEIGHT 1 U.S. GALLON OF WATER = 8.33 LBS. 1 CUBIC FOOT OF WATER = 62.35 LBS.
1 KILOGRAM (LITRE) = 2.2 LBS. 1 IMPERIAL GALLON = 10.0 LBS.
CURRENT CAPACITY (AMPS) OF WIRE * Three wires in cable, ambient temp. 86°F
AMPERES
EFFICIENCY
WIRE SIZE
POWER OUTPUT POWER INPUT
COPPER
ALUMINIUM
EFFICIENCY
14 12 10
20 25 30 40 55 70 85 95
–
HP OUTPUT K.W. INPUT
MOTOR EFFICIENCY
20 25 30 40 55 65 75 85
G.P.M x TOTAL HEAD (F.T.) 3960 x BHP G.P.M x TOTAL HEAD (F.T.) 5310 x K.W. INPUT
PUMP EFFICIENCY
8 6 4 3 2 1 0
OVERALL PLANT EFFICIENCY (OPE)
Watts Volts
Amperage =
110 125
Watts =
Volts x Amperage
100
Water Horsepower (output HP of pump) = g.p.m x total head 3960
* Wire size is minimum for amperes listed.
WHP =
HP input (to motor) =
KW input x 1.341
Discharge head + Pumping water level (ft) Discharge Pressure (PSI) x 2.31 ft. of head
Total Head =
Discharge Head =
533
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