HALE Silencer AP Series, Installation, Operation And Service Maintenance Manual, Page: 36 / 146

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Operation
36
Section 3: Operating
Hale Products, Inc., May 2005, Rev-B
Figure 3-2: Pump Operator’s Panel
9. Note the discharge and intake pressures, then gradually open the engine
throttle until the master discharge gauge indicates the desired pressure.
10. Set the automatic relief valve according to your fire department policy, if so
equipped. If your fire department does not have a policy, see heading “TPM
Operation from a Hydrant” on page 37.
CAUTION !
DO NOT REDUCE THE PRESSURE ON THE INTAKE GAUGE BELOW DEPART-
MENT LIMITS. SERIOUS DAMAGE TO THE WATER MAIN COULD RESULT.
11. If the master intake gauge shows a vacuum before the desired discharge
pressure or flow is achieved, you are receiving all the water that the suction
piping (hydrant) can supply.
12. If you need to increase pressure when this occurs, pump flow must be
reduced or the water supply improved.
To increase pressure, reduce the pump flow. However, the master intake
gauge reading must be maintained at 5 PSI (0.34 BAR / 0.04 MPa),
minimum.
13. As the throttle (engine speed) is increased, the pressure gauge reading
increases.