Monitor water level in each storage tank, total level in all four storage tanks, and the amount of chlorine
ROWPU's will continue to operate and fill drinking water storage tanks until manually shut down (paragraph 3-
6.1). Stop and restart units as often as needed to maintain flow of water into storage tanks.
Perform during operation preventive maintenance procedures.
While ROWPU's are operating, periodically perform the following eight steps:
Monitor pressure gauges and flow indicators for normal readings listed below.
(2) Monitor MEDIA FILTER OK indicator light on control station. If light goes out, check difference between
media filter output pressure gauge P1 and media filters output pressure gauge P2. If difference exceeds
35 psi, backwash media filters (paragraph 4-7.2). If pressure difference is acceptable, check indicator
light. Replace bulb if necessary.
(3) Monitor CARTRIDGE FILTER OK indicator light on control station. If light goes out, check pressure
difference between media filters output pressure gauge P2 and cartridge filter output pressure gauge P3.
If difference exceeds 12 psi, change cartridge filter assembly (paragraph 4-7.1.1). If pressure difference
is acceptable, check indicator light. Replace bulb if necessary.
(4) Monitor difference between HP pump discharge pressure gauge P4 and brine discharge pressure gauge
P5. If difference exceeds 25 psi, clean RO block membranes (paragraph 4-7.4.2).
(5) Monitor EMS salinity, HIGH PRESSURE WATER PUMPS, POTABLE WATER TANKS, and CHLORINE
STATUS display pages for normal readings. Alarms are activated when parameters exceed normal
limits. These indications should be periodically checked, however, in case of alarm failures. When
alarms sound, turn off alarms according to TM 55-1930-209-14 & P-11.
(6) Monitor coagulant pump and inhibitor pump amber and red indicator lights on pump control panel (Figure
3-5). When amber light goes out, pump may be malfunctioning. Troubleshoot according to paragraph 4-
4. When red indicator light comes on, supply drum may be empty. Replace drum if necessary.
(7) Monitor HP pump diesel engine gauges (Figure 3-2) for readings listed below. If not normal,
troubleshoot according to paragraph 4-4.
Normal (green) zone
Normal (green) zone
Slightly positive near zero
Normal (green) range
Periodically check product water quality for TDS (salinity) and pH according to TM 5-6630-215-12.
Obtain product water sample at valve R09. Make sure salinity reading is less than 1000 ppm and pH
factor is about 7. If readings are not within these values, troubleshoot according to paragraph 4-4.