Hale Q Series Muscle - Manual (Page 195)

195 MUSCLE (Midship) Pumps Installation, Operation, and Maintenance Manual
p/n: 029-0020-63-0
Cavitation 
Cavitation is also eliminated by increasing the pump inlet pressure. This is accom-
plished with reduced vertical lift, reduced inlet losses, or running from positive pres-
sure supplies.
During Operations
 Do not increase pump speed beyond the speed at which the pressure ceases to
rise. The higher the elevation above sea level, the lower the atmospheric pressure
and less lift. Lift loss is in addition to NFPA Baseline of 2.38 ft. (0.73 meters) at
2,000 (610 meters) of elevation - (See Table G-1: “Lift Loss from Elevation.”)
 Open the throttle gradually and watch the pressure gauge and the tachometer, if
equipped. An increase in engine RPM without a corresponding increase in pres-
sure indicates cavitation.
 Monitor the water temperature. Table G-2: “Lift Loss from Temperature” shows the
amount of lift loss as temperatures rise.
Table G-1: Lift Loss from Elevation
Elevation, Feet
(Meters)
Lift Loss
Feet (Meters)
2,000 (610) NFPA Base Line - 2.38 ft. (0.73 m)
3,000 (914) 1.1 (0.33)
4,000 (1,219) 2.2 (0.67)
5,000 (1,524) 3.3 (1.00)
6,000 (1,829) 4.4 (1.34)
7,000 (2,134) 5.5 (1.67)
8,000 (2,438) 6.6 (2.01)
9,000 (2,743) 7.7 (2.35)
10,000 (3,048) 8.8 (2.68)
Table G-2: Lift Loss from Temperature
Water
Temperature
F° (C°)
Lift Losses
Head Ft. (Meters)
60° (16°) NFPA Base Line - 2.38 ft. (0.73 m)
70° (21°) 0.3 (0.09)
80° (27°) 0.6 (0.18)
90° (32°) 1.1 (0.34)
100° (38°) 1.7 (0.52)
110° (43°) 2.5 (0.76)