TM 55-1930-209-14&P-3
Table B-1. Preventive Maintenance Checks and Services for ROWPU System (Continued)
B-Before
D-Daily
Q-Quarterly
D-During
W-Weekly
S-Semiannually
A-After
M-Monthly
A-Annually
ITEM
PROCEDURES
INTERVAL
TO BE
CHECK FOR AND HAVE
EQUIPMENT
ITEM
INSPECTED
REPAIRED OR ADJUSTED
IS NOT READY/
NO.
AS NECESSARY
AVAILABLE IF:
B D
A D W M Q
S
A
23) After allotted time, stop seawater
pump.
24) Close valves RO13 and RO14.
25) Open valve RO12 and close valve
RO19.
26) Open seawater valve SW9 for ROWPU
1 or SW10 for ROWPU 2.
27) Start seawater pump to flush RO
Block.
28) Flush for 20 minutes and take a water
pH is 3.5 or below
sample at valve RO17. Use a water
or element still
test kit to check pH. If pH not accept-
dirty.
able, flush RO block membrane for 30
minutes more and test again. Con-
tinue flushing until pH is acceptable
(pH7).
29) Stop seawater pump.
6
Cartridge Filter
a. Charge cartridge filter assembly when
CARTRIDGE
Assembly
pressure difference between media filter
FILTER OK light
output pressure gauge P2 and cartridge
goes out or P3
filter assembly output pressure gauge P3
gauge exceeds
exceeds 12 psi or when CARTRIDGE
12 psi.
FILTER OK light goes out.
NOTE
A minimum of 3 personnel and a bridge
crane with a 2-ton hoist is required to
change cartridge filter assembly (filter
elements).
B-18
