Hale MBP Booster - Manual (Page 31)

❑ Operation
30 Silencer Series Booster Pump, p/n: 029-0020-83-0
If you need to increase pressure when this occurs, the pump flow must be
reduced or the water supply improved.
12. As the throttle is increased, the pressure gauge reading increases with engine
speed. If the engine speed increases without an increase in pressure, the
pump could be cavitating. See Section 3.4 “Cavitation” on page 36.
Cavitation can occur on a hydrant and it indicates the need to reduce the flow
or improve the water supply.
13. Close the throttle slowly until the pressure begins to stabilize and track with
engine speed. If this does not correct the problem, you may be trying to pump
more capacity than is available from the supply. Also check the inlet strainers
for possible debris restricting the flow.
14. Set the automatic relief valve according to department policy. If no policy
exists, see heading “Pumping from Draft” on page 31.
IMPORTANT !
IF THE PUMP OVERHEATS AND IT IS NOT EQUIPPED WITH A HALE TRV
VALVE, OPEN THE VALVE TO ACCESS THE BYPASS (PUMP COOLER) LINE,
IF SO EQUIPPED, OR OPEN THE VALVE TO THE BOOSTER TANK TO CIRCU-
LATE WATER.
15. When pumping operations are completed, gradually reduce the pump pressure
until the engine returns to IDLE speed. See heading “Pumping from Draft” on
page 31.
16. Disengage the PTO per the PTO manufacturer’s instructions.
Draft Limiting Factors
(See Table 3-3: “Base Line NFPA Ratings,” on page 31.)
The effect of raised water temperatures when pumping from a positive pres-
sure source (i.e., a hydrant) is negligible on fire pump performance. How-
ever, when pumping from draft, elevated water temperature does have a
limiting effect.
Water temperature above 95
°
F (35
°
C) causes a noticeable decrease in lift
when drafting.