Hale RSD - Manual (Page 38)

❑ Operation
38 Section 3: Operating
Hale Products, Inc., Nov.2005, Rev-A
8. Shutdown starts from the fire ground pump and works toward the water
source. Gradually reduce pressure at the fire ground pump until you can
disengage the pump.
Follow this procedure for every pump in the relay until the pump at the water
source is shut down.
NOTICE !
LOCAL TRAINING PROCEDURES MAY VARY SLIGHTLY FROM ABOVE. IN THIS
CASE, ALWAYS FOLLOW LOCAL TRAINING PROCEDURES.
3.4 TANDEM (SERIES) PUMPING
Tandem pumping operations may be used when higher pressures are required
than a single engine is capable of supplying. This sometimes occurs when the
pumper is attempting to supply high-rise sprinkler or standpipe systems or long
hose layouts.
Note: Two 1,000 GPM (3,785 LPM) pumpers in a series from a hydrant can produce
500 GPM (1,893 LPM) at 500 PSI (35 BAR) if the relief valve systems allow 500 PSI.
CAUTION !
WHEN SUPPLYING HOSE LINES IN A TANDEM PUMPING OPERATION IT IS POS-
SIBLE TO SUPPLY GREATER PRESSURE THAN THE HOSE CAN WITHSTAND.
PRESSURE SUPPLIED TO THE HOSE SHOULD NOT EXCEED THE PRESSURE
AT WHICH THE HOSE IS ANNUALLY TESTED BY THE DEPARTMENT.
CONSULT NFPA 1962, “STANDARD FOR THE CARE, USE AND SERVICE TEST-
ING OF FIRE HOSE INCLUDING COUPLINGS AND NOZZLES,” FOR THE TEST
PRESSURES RECOMMENDED FOR THE TYPE OF FIRE HOSE USED BY YOUR
FIRE DEPARTMENT. DEPARTMENTS THAT ROUTINELY PERFORM HIGH-PRES-
SURE TANDEM PUMPING OPERATIONS MAY HAVE HOSE DESIGNATED FOR
THAT SPECIFIC FUNCTION.
In tandem pumping, the pumper directly attached to the water supply source
pumps water through its discharge outlet(s) into the intake(s) of the second
engine. This enables the second engine to discharge water at a much higher
pressure than a single engine could have supplied. The higher pressure results
from the pumps acting in series.