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K-factors
Plastic Pipe
To convert K from to multiply K by
U.S. gallons cubic feet 7.479
U.S. gallons cubic inches 0.00433
U.S. gallons cubic meters 263.85
U.S. gallons pounds of water 0.120
U.S. gallons acre feet 325853
U.S. gallons liters 0.264
U.S. gallons Imperial gallons 1.201
To convert K from to multiply K by
liters cubic meters 1000
liters kilograms of water 1
liters gallons 3.785
Schedule 80 Plastic pipe per ASTM-D-1785
K-FACTOR K-FACTOR A-FACTOR A-FACTOR
PIPE PULSES/ PULSES/ U.S.
SIZE U.S. GAL LITER GPM/HZ LPM/HZ
1 1/2
139.400 36.8296 0.4304 1.6291
2 90.790 23.9868 0.6609 2.5014
2 1/2 64.610 17.0700 0.9286 3.5149
3 41.050 10.8454 1.4616 5.5323
3 1/2 29.940 7.9102 2.0040 7.5852
4 22.660 5.9868 2.6478 10.022
5 13.700 3.6196 4.3796 16.577
69.1990 2.4304 6.5224 24.687
84.9060 1.2962 12.230 46.290
10 2.9450 0.7781 20.374 77.114
12 1.9930 0.5266 30.105 113.95
K-factors and A-factors are listed in
U.S. gallons and in liters. Conversion
formulas for other engineering units
are listed below.
• The K-factor is the number of pulses generated
by the FP-6000 series paddlewheel per unit of
liquid in a specific pipe size.
• The A-factor is the flow rate (per minute) repre-
sented by 1 Hz output from the FP-6000 series
sensor in a specific pipe size.
Schedule 40 Plastic pipe per ASTM-D-1785
K-FACTOR K-FACTOR A-FACTOR A-FACTOR
PIPE PULSES/ PULSES/ U.S.
SIZE U.S. GAL LITER GPM/HZ LPM/HZ
1 1/2
124.400 32.8666 0.4823 1.8256
2 80.140 21.1731 0.7487 2.8338
2 1/2 56.730 14.9881 1.0576 4.0032
3 36.180 9.5588 1.6584 6.2769
3 1/2 26.500 7.0013 2.2642 8.5698
4 20.140 5.3210 2.9791 11.276
5 12.250 3.2365 4.8980 18.539
6 8.1430 2.1514 7.3683 27.889
8 4.3980 1.1620 13.643 51.637
10 2.6340 0.6959 22.779 86.219
12 1.7770 0.4695 33.765 127.80
K = 60/A
A = 60/K