Hale RSD - Manual (Page 33)

33 Section 3: Operating
Hale Products, Inc., Nov.2005, Rev-A
O p er atio n
❑
Your departmental manual for pumping should specify the correct RPM for
priming. However, in general, priming should be operated at IDLE.
Running the engine at speeds higher than 1,200 RPM during priming is not
recommended. It does not improve the priming operation but can cause
damage to the pump.
CAUTION !
IF THE DISCHARGE GAUGE READING DOES NOT INCREASE, THE INTAKE
GAUGE READING DOES NOT FALL BELOW ZERO (0), OR THE PRIMING PUMP
DOES NOT DISCHARGE WATER TO THE GROUND WITHIN 30 TO 45 SECONDS,
DO NOT CONTINUE TO RUN THE PRIMING PUMP.
STOP THE PUMP AND CHECK FOR AIR LEAKS OR POSSIBLE PROBLEMS. SEE
SECTION 5 “TROUBLESHOOTING,” ON PAGE 59.
8. Monitor the intake and discharge master gauges. When the pump is
primed, the intake indication reading falls below zero (0), and the discharge
pressure starts to increase. You may also hear water splashing on the
ground from the primer, indicating the pump is primed.
9. Gradually open the discharge valve until water emerges in a steady stream.
Then open the other discharge valves to the desired setting.
10. Open the engine throttle gradually until the desired pressure or flow is
achieved.
CAUTION !
DO NOT PUMP ENOUGH WATER TO CAUSE A WHIRLPOOL AT THE STRAINER.
THIS ALLOWS AIR INTO THE PUMP, RESULTING IN ROUGH OPERATION AND
PULSATION. REPOSITION THE STRAINER OR REDUCE FLOW TO CORRECT
THE SITUATION.
As the throttle is opened, the pressure gauge reading increases with the
engine speed. If the engine speed increases without an increase in pres-
sure, the pump may be cavitating.
11. If the pump is cavitating, warn personnel that the flow is being REDUCED.
In this case, close the throttle slowly until you operate without cavitation.
The following possibilities can also lead to cavitation:
❑ Large nozzle tips - reduce flow by using a smaller nozzle.