TM 55-1930-209-14&P-19
Table 3-3. 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
INTERVAL
ITEM
PROCEDURES
EQUIPMENT
ITEM
TO BE
CHECK FOR AND HAVE
IS NOT READY/
NO.
INSPECTED
REPAIRED OR ADJUSTED
AVAILABLE IF
B D A D W M Q S A
AS NECESSARY
5) After 2 minutes of fast backwash, par-
tially close valve RO6 to obtain slow
backwash flow rate at Fl.
6) After 2 minutes of slow backwash,
stop seawater pump by turning pump
ON/OFF/START switch on control
station to OFF.
e. Backwash media filter 2:
1) Position RO valves as indicated
below:
O = Open
X = Closed 1/20 = 1/2 open
A = Position A
B = Position B
C = Position C
RO Valve No.
Valve Position
1
A
2
B
3
A
4
C
5
X
6
1/20
7
X
12
O
18
O
19
X
2) Follow procedures shown above.
f. Backwash media filter 3:
1) Position RO valves as indicated
below:
O = Open
X =Closed 1/20 = 1/2open
RO Valve No.
Valve Position
1
A
2
A
3
B
4
C
5
X
6
1/20
7
X
12
O
18
O
19
X
3-14