Before operating ROWPU system, check system for damage and perform before operation preventive
maintenance procedures (paragraph 4-3).
Seawater system provides seawater (feedwater) to ROWPU's 1 and 2 for
processing into product water.
Make sure seawater system is ready for operation by ensuring strainers are clean and filters have been
drained. Set seawater system valves to provide seawater to either ROWPU 1 or 2 or both (TM 55-1930-209-
14 & P-2).
The EMS monitors ROWPU's 1 and 2, product water salinity, and HP pump diesel
engine cooling water temperature and oil pressure.
Make sure EMS is operating normally (TM 55-1930-209-14 & P-11).
Section III. Operating procedures
General. ROWPU's 1 and 2 are normally started on a staggered schedule with at least a 2 hour interval
separating start up of the two units. After each unit operates for 10 hours, it is shut down for 2 hours for required
maintenance such as membrane cleaning, media backflushing, and cartridge filter changing. This staggered startup
keeps product water flowing ashore and keeps the barge workload within the capabilities of crews required to maintain a
continuous 24 hour operation.
3-4 Startup procedures
Perform prestart procedures (paragraph 3-2).
Valves are positioned initially to bypass the HP pump and to discharge seawater
(feedwater) overboard. As soon as the flow is satisfactory, flow is directed
through HP pump.
The RO valves are identified in Figures 1-2, 1-3, and 1-5 is in Table 3-3.
Position ROWPU RO valves as shown in table below. Make sure valve RO7 is fully open.
o = open
x = closed
A = position A
B = position B
RO valve no.
RO valve no.
Do not start seawater pumps until seawater valves are positioned to supply
seawater to ROWPU's and RO valves are positioned to bypass HP pump and
discharge feedwater through void 5 port overboard discharge.
Start seawater pump by turning OFF/ON/START switch (Figure 3-1) to START. When pump starts, release
switch. Switch will return to ON position.