Make sure seawater pump discharge pressure gauge P1 reads 100 psi and product water flowmeter F2 reads
Set up product water flow as follows:
Gradually close brine throttling valve RO7 and increase engine speed until product water flowmeter F2
reads about 108 gpm.
At the same time, make sure HP pump discharge pressure gauge P4 reading does not exceed 835 psi.
Make sure brine discharge pressure gauge P5 reading does not exceed 820 psi.
While closing valve RO7, ensure brine discharge flow is evident in brine flow indicator glass.
If flow rate indicator Fl reading drops below 350 gpm during this operation, slowly open RO7 and
increase engine speed until F1 reads 350 gpm.
Make sure readings do not exceed 108 at F2 and 820 psi at P5.
During initial startup or after a shutdown longer than 3 days, product water
should be discharged overboard until quality is acceptable.
Allow product water from RO block to flow directly overboard through overboard discharge in void 3 port, for
at least 15 minutes.
While dumping product water overboard, perform the following checks:
Monitor pressure gauges and flow indicators for normal readings.
Monitor MEDIA FILTER OK indicator light (Figure 3-1).
If light goes out, check pressure difference between seawater pump discharge pressure gauge P1
and media filters output pressure gauge P2.
If pressure difference exceeds 35 psi, backwash and flush media filters (paragraph 4-7.2).
If difference is less than 35 psi, check indicator light. Replace bulb if necessary.
Monitor CARTRIDGE FILTER OK indicator light (Figure 3-1).
If light goes out, check pressure difference between media filters outlet pressure gauge P2 and
cartridge filter assembly outlet pressure gauge P3.
If pressure difference exceeds 12 psi, change cartridge cage assembly (paragraph 4-7.1.1).
If difference is less than 12 psi, check indicator light. Replace bulb if necessary.
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).
Operating temperature is critical in diesel engines. Shut down HP pump diesels
immediately if EMS indicates lubricating oil pressure is too low or cooling water
temperature is too high.