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