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Weights
1 U.S. Gallon of Water
1 Cu. Foot of Water
1 Imperial Gallon
1 Liter
 8.3357 Pounds
62.3554 Pounds
10.0 Pounds
2.2 Pounds
Pressures
1 Atmosphere
1 Atmosphere
1 Pound per Square Inch
1 Pound per Square Inch
1 Foot of Head
1 Inch of Water Column
1 Kilogram/sq. Centimeter
1 Foot of Water
 33.94 Ft. of Water @ 62° F
14.6963 lbs./sq. Inch
2.31 Feet of Head
27.7612 Inches of Water
.433 Pounds/sq. Inch
.0360 Pounds/sq. Inch
14.22 lbs./sq. Inch
62.3554 lbs./sq. Foot
Flows
1 Gallon/Minute (U.S.)
1 Gallon/Minute (U.S.)
1 Gallon/Minute (U.S.)
1 Gallon/Minute (U.S.)
1 Gallon/Minute (U.S.)
1 Gallon/Minute (U.S.)
1 Cubic Ft. per Second
1 Liter per Second
1 Cubic Meter per Minute
1 Acre Inch per Hour
1 Acre Foot per Day
1,000,000 Gallons per Day
1 Cubic Ft. per Second
 .002228 cu. ft./Second
.13368 cu. ft./Minute
8.0208 cu. ft./Hour
.06309 Liters/Second
3.78533 Liters/Minute
.0044192 Acre Ft./24 Hrs.
448.83 GPM
15.85 GPM
664.2 GPM
452.57 GPM
226.3 GPM
694.4 GPM
.992 Acre Inches/Hr.

Comparing Flow rate to Velocity
(in type 'L' copper)
Pipe Size (Nom) @ 3.0'/Second @ 3.5'/Second Suggested Maximum
Flow Rate
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
 2.2 gpm
4.5 gpm
7.5 gpm
12.0 gpm
17.0 gpm
29.0 gpm
 2.64 gpm
5.40 gpm
9.00 gpm
14.40 gpm
20.40 gpm
34.80 gpm
 2.2 gpm
4.8 gpm
9.0 gpm
14.4 gpm
20.4 gpm
34.8 gpm

Water Flow Rate Guide
Gallons Per Minute
(GPM) 		Seconds to fill
a quart jar.
 Seconds to fill
a gallon jug.
0.75 gpm
1.00 gpm
1.50 gpm
2.00 gpm
2.50 gpm
3.00 gpm
3.50 gpm
4.00 gpm
 20.00 *
15.00 *
10.00 *
7.50
5.00
4.50
4.25
3.75
 80
60
40
30 *
24 *
20 *
17 *
15 *
* = most practical

PSI Loss per 100' - Type 'L' Copper Tubing
Size Velocity
(FPS)		 GPM PSI Loss
1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
2 1/2"
3"
4"
 5
5
6
6
7
7
8
8
8
 3.64
7.54
15.43
23.50
38.81
67.52
119.00
170.00
299.00
 10.12
6.59
7.10
5.30
6.03
4.17
4.35
3.54
2.43


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