TM 55-1930-209-14&P-1
Table 14-1. Major Components of Drinking Water System (continued)
Component
Function
Location
Shower
Personal hygiene
Weatherdeck forward
2 motor controllers
Control automatic and
Void 3 port on aft bulkhead
for discharge pumps
manual operation of
1 and 2
discharge pumps
Motor controller
Controls manual operation
Void 3 port near filter
for pressure set
of pressure set water
2 remote switches
Control remote operation
ROWPU space on
for discharge
of discharge pumps
forward bulkhead
pumps 1 and 2
Pump and storage
Selects discharge pump
Void 3 port on aft bulkhead
tank selection switch
and storage tank whose
liquid level switches
automatically start and stop
discharge pump
Section II. Description of operation
14-6 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 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.
14-7 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.
14-5
