TM 55-1930-209-14&P-5
CHAPTER 2 DESCRIPTION OF OPERATION
2-1 Drinking water supply. When product water flows from the ROWPU's, chlorine Is added. With the addition of
Chlorine, this ROWPU product water becomes drinking water and flows into four storage tanks. As the drinking water In
each tank rises, the water level Is shown on a liquid level Indicator mounted on each tank The water level in each tank is
also sensed by a level sensor, which transmits a signal to the Equipment Monitoring System (EMS). The EMS video
monitor's POTABLE WATER TANKS display page shows the water level, in gallons, In each tank and the total amount In
all four tanks
2-2 Drinking water supplied to shore or port discharge valve. With the pump motor controller AUTO/OFF/HAND
switch In AUTO, the shore discharge pump automatically transfers drinking water to one of two delivery systems when
water In a tank reaches the high level switch. In normal operation, water Is pumped to the stern-mounted shore
discharge hose which transports the water to a storage facility ashore In the other option, the water is pumped through a
valve on the portside to another vessel or simply overboard When the tanks are being filled and the high level switch
does not start the pump, alarms sound when the water In the tank reaches another switch at a higher level These alarms
warn the crew that corrective action must be taken. When the tanks are being emptied and the water level reaches the
low level switch, the discharge pump automatically stops If this low level switch does not stop the pumps, alarms sound
when tank water levels reach another switch at a lower level in the tank
These alarms warn the crew that the pumps must be stopped and corrective action taken The tanks can be emptied
manually, when motor controller AUTO/OFF/HAND switch is In HAND, by operating the START and STOP buttons on
the local motor controller or the remote switches on the forward bulkhead In the ROWPU space As the drinking water Is
discharged by the pump, the following items are monitored water pressure, flow rate, salinity, and total water discharged
A pressure sensor measures the discharge water pressure (Indicated on a pressure gauge In void 3 port and shown on
the EMS video monitor). The flow rate and total gallons of water pumped are shown on a meter In void 3 port In
addition, flow rate and salinity values are shown on the EMS video monitor If either discharge pressure or salinity falls
outside acceptable values, visual and sound alarms are activated These alarms warn the crew that corrective action
must be taken
2-3 Drinking water for onboard use. Drinking water for use onboard flows from the storage tanks to the pressure set
The pressure set pumps water to the drinking fountain and sink In the dayroom, shower on the forward weatherdeck, and
washdown stations in the ROWPU space and deckhouse top The pressure set also supplies water to the chlorinating
system As a reserve backup, the pressure set pumps water from the reserve tank, If water is not available from the
storage tanks This tank also can be filled with water from another vessel or shore supply through a fill pipe located on the
weatherdeck near the port discharge valve
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