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
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 =: 1/2 open
RO Valve No.
Valve Position
1
A
2
A
3
B
4
C
5
X
6
1/20
7
X
12
0
18
O
19
X
B-12
