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
2) Start seawater pump by turning pump
OFF/ON/START switch on control
station to START and then to ON.
3) Adjust valve RO6 to obtain slow back-
wash flow rate of 162 gpm at seawater
flow indicator F1 and a temperature
reading of 80°F at seawater
temperature gauge T1. Exact flow
rate depends on actual temperature
reading. Cooler water requires less
flow.
TEMPERATURE (Backwash) FLOW RATE
Temperature
Slow backwash
Fast backwash
T1 (F)
F1 flow rate (qpm)F1 flow rate (qpm)
55
115
180
60
125
200
65
135
220
70
144
240
75
153
255
80
162
270
85
170
285
90
177
300
95
184
315
100
191
325
105
198
334
110
204
342
115
210
350
120
216
355
125
222
360
4) Observe condition of water at brine
flow indicator.After 5 minutes or
when water is clear, open valve RO6
to obtain fast backwash flow rate cor-
responding to water temperature at
T1.
3-13
