HALE Silencer AP Series, Инструкция по установке, эксплуатации и техническому обслуживанию

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37
Section 3: Operating
Hale Products, Inc., May 2006, Rev-B
Oper ation
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14. 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 pumping
more capacity than is available from the supply. Also check the inlet strainers
for possible blockage.
15. Open the discharge valves.
IMPORTANT !
IF THE PUMP OVERHEATS AND IS NOT EQUIPPED WITH THE HALE TRV, OPEN
THE VALVE TO ACCESS THE PUMP AUXILIARY COOLING SYSTEM, OR
SLIGHTLY OPEN THE TANK FILL LINE TO CIRCULATE WATER.
16. When pumping operations are completed, gradually reduce the pump pres-
sure until the engine returns to IDLE speed. See heading “Pumping From
Draft” on page 38. Disengage the PTO per the PTO manufacturer’s instruc-
tions. Also see heading “Pump-To-Road Shift Procedures” on page 45.
TPM Operation from a Hydrant
When operating from a positive inlet pressure, it may be necessary to adjust the
TPM relief valve to a point where water is dumping to the ground.
The internal relief valve is always opened first, and if it cannot handle the pres-
sure rise, the external relief valve dumps water on the ground. When the inter-
nal relief valve opens, the panel light illuminates, and when the external dump
valve opens, the light on the panel FLASHES.
Draft Limiting Factors
The effect of raised water temperatures when pumping from a positive pressure
source (i.e., a hydrant) is negligible on fire pump performance. However, when
pumping from draft (static source such as a pond, lake or basin), elevated water
temperature does have a limiting effect.
Water temperatures above 95°F (35°C) cause a noticeable decrease in lift
when drafting. Also see Figure F-5: “Lift Loss from Temperature” on page 141.
Barometric pressures below 29” Hg. can also limit lift when drafting. High ele-
vations and storm conditions can affect maximum flow available from any
pump. Also see Figure F-6a: “Lift Loss from Barometric Reading” on page 141.