Calculating Available Power

Nozzle Selection Chart

Nozzles Size: for multiple-nozzle machines, multiply flow by number of nozzles

The Watermotor Model 90 uses nozzles up to 1/2" dia. (12.7 mm)
and the Model 150 up to 7/8" (22.2 mm).

U.S. units Model 90 Model 150 Model 90 Model 150
Noozle Diameter 5/16" 3/8" 7/16" 1/2" 5/8" 3/4" 7/8"
Net Fall
(feet)
Pressure
(PSI)
Flow
(gallons per minute)
Rate of Revolution
(RPM)
30 13.0 10.5 15.1 20.6 26.9 42.0 60.5 82.4 1303 752
40 17.3 12.1 17.5 23.8 31.1 48.5 69.9 95.1 1497 865
50 21.7 13.6 19.5 26.6 34.7 54.3 78.1 106.0 1680 970
60 26.0 14.8 21.4 29.1 38.0 59.4 85.6 117.0 1829 1056
80 34.6 17.1 24.7 33.6 43.9 68.6 98.8 135.0 2115 1221
100 43.3 19.2 27.6 37.6 49.1 76.7 110.0 150.0 2366 1366
120 52.0 21.0 30.3 41.2 53.8 84.1 121.0 165.0 2595 1498
150 65.0 23.5 33.8 46.0 60.1 93.9 135.0 184.0 2903 1676
200 86.6 27.1 39.1 53.2 69.4 109.0 156.0 213.0 3349 1934
250 108.0 30.3 43.6 59.4 77.6 121.0 175.0 261.0 3738 2158
300 130.0 33.2 47.8 65.1 85.1 133.0 191.0 283.0 4103 2369
 
Metric System Model 90 Model 150 Model 90 Model 150
Noozle Diameter 7.9 mm 9.5 mm 11.1 mm 12.7 mm 15.9 mm 19.0 mm 22.2 mm
Net Fall
(meters)
Pressure
(kg/cm2)
Flow
(litres per minute)
Rate of Revolution
(RPM)
9.2 0.90 39.8 57.2 78.1 102.0 159.2 229.3 312.3 1303 752
12.2 1.19 45.9 66.3 90.2 117.9 183.8 264.9 360.4 1497 865
15.2 1.50 51.5 73.9 100.8 131.5 205.8 296.0 401.7 1680 970
18.3 1.79 56.1 81.1 110.3 144.0 225.1 324.4 443.4 1829 1056
24.4 2.38 64.8 93.6 127.3 166.4 260.0 374.4 511.6 2115 1221
30.5 2.98 72.8 104.6 142.5 186.1 290.7 420.7 568.5 2366 1366
36.6 3.58 79.6 114.8 156.1 203.9 318.7 458.5 625.4 2595 1498
45.8 4.48 81.9 128.1 174.3 227.8 355.9 511.6 697.4 2903 1676
61.0 5.97 102.7 148.2 201.6 263.0 413.1 591.2 807.3 3349 1934
76.2 7.44 114.8 165.2 225.1 294.1 458.6 663.2 902.0 3738 2158
91.5 8.96 125.8 181.2 246.7 322.5 504.1 723.9 989.2 4103 2369