13-11 Operating procedures
13-11.1 General. ROWPU's 1 and 2 are normally started on a staggered schedule with at least 2-hour interval separating
startup 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 crew complement required to maintain a
continuous 24 hour operation.
13-11.2 Startup procedures
Perform prestart procedures in paragraph 13-10.
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 13-1,13-2, and 13-4 and Table 13-3.
Position RO valves as shown in table below. Make sure valve RO7 is fully open.
o = open
x = dosed
A = position A
B = position B
RO valve no.
RO valve no.
1617 18 19 20 21
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 13-6) to START. When pump starts, release
switch. Switch will return to ON position.
Check appearance of feedwater in seawater pump flow rate indicator, F1 (Figure 13-6).
If feedwater is not too dirty (cloudy), go to step e.
If water is very dirty, stop pumps. Make sure seawater strainer is clean and seawater filter has been
Repeat steps c and d.
Start coagulant pump by turning coagulant pump ON/OFF switch (Figure 13-6) to ON.
Set pump stroke to 50 and speed control to 35 on coagulant pump control panel (Figure 13-10).
Make sure amber indicator light comes on (Figure 13-10). If amber indicator lamp does not light (Figure 13-
10), troubleshoot according to Table 4-1 in TM 55-1930-209-14 & P-3.
Make sure red indicator light does not come on. if red indicator light comes on, replace coagulant drum
according to paragraph 4-14.1.3 in TM 55-1930-209-14&P-3.