UFC 3-460-03
21 JANUARY 2003
flushed for seventeen minutes for a total of 154,444 liters (40,800 gallons), which is double the
capacity of the loop.
6.6.2.1. Flush Procedures:
6.6.2.1.1. Place manual valves in the required position to direct fuel flow through the desired
flow path, i.e., through the receiving separator or through the separator manual bypass valve.
6.6.2.1.2. Place the PCP mode selector switch in flush mode and the following will occur:
6.6.2.1.2.1. BPCV solenoid will D/C the main valve.
6.6.2.1.2.2. D/FV solenoid B will E/O the valve when flow is established.
6.6.2.1.3. Manually turn on the desired pumps by placing both the MCC and pumphouse Hand-
Off Auto pump selector switches to the "Hand" position. When the pumps are started, the PCV
will E/C the valve.
6.6.2.1.4. Flush until the required amount of fuel is moved through the system at a rate of at
least 1.8 meters (6 feet) per second.
6.6.2.1.5. When complete, manually turn off all pumps.
6.6.2.1.6. Return all manually operated valves to their typically open or closed position.
6.6.2.1.7. Return all pump selector switches back to the "Auto" position.
6.6.2.1.8. Place the mode selector switch in automatic mode from the flush mode.
6.6.2.1.9. Observe system operation to ensure the system returns to the pressurized idle
condition (75 psi).
6.6.3. Emergency Operation (Microprocessor Down).
6.6.3.1. If both microprocessors are down, the system can be started for emergency fueling using
the following procedures:
6.6.3.1.1. Place the fuel pump selector in the "Off" position.
6.6.3.1.2. Ensure the selected operating tank inlet and outlet valves are open.
6.6.3.1.3. Close the manual valve on the inlet of the PCV.
6.6.3.1.4. Manually energize (bypass) the BPCV solenoid to enable the valve to modulate at the
set point.
6.6.3.1.5. Manually start the fueling pumps as required by placing the MCC and pumphouse
pump selector switch in the "Hand" position. Operator must read the mechanical DPTs located
at the return venturi. If the DPTs show less than 151 liters per minute (40 gallons per minute)
returning to the operating tank, manually start an additional fueling pump. If the DPTs show
more than 2649 liters per minute (700 gallons per minute), manually stop a fueling pump.
Manually stop the last fueling pump after the emergency operation is complete.
6.6.3.1.6. Open the manual valve before the PCV.
6.6.3.1.7. Manually de-energize the BPCV solenoid.
6.6.3.1.8. Return the fuel pump selector switches to the original position.
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