Remove pressure gauge.
Cover tube opening to prevent foreign material from entering.
Installation. Install pressure gauge in reverse order of removal in step a.
4-7.2.5 Seawater filter 1 and 2 (Lakos separator)
4-18.104.22.168 Cleaning and Inspection
Wipe clean exterior of filter with rag dampened with hot soapy water or an approved solvent. Wipe dry
with clean cloth.
Visually inspect exterior for damage, leaks, corrosion, or chipped paint. Clean corrosion and touch up
paint according to TB 43-0144. Open inspection/clean port located on top at lower end of filter and
inspect for larger particles. Remove larger particles if necessary.
4-22.214.171.124 Seawater filter purging and draining. Seawater filters 1 and 2 (separators) must be regularly purged during
seawater system operation to prevent solids from overfilling filter collection chambers.
Purge according to the following schedule:
In water that is not overly dirty or contaminated - about 15 seconds during every 8 hours of
In water that is dirty - about 15 seconds during every hour of operation or as needed.
Drain filters by:
Drain only filter(s) in active use. If only one ROWPU system is in use with just one
seawater pump, then drain only filter(s) in use.
Opening seawater valves SW22 (filter 1), SW23 (filter 2), and SW26 for time specified in
paragraph a above.
Close valves SW22, SW23, and SW26.
Record time/date of purging in operations log.
Close seawater valves SW20 and SW22 of seawater filter 1 or SW23 and SW26 of seawater filter
Disconnect piping from filter.
Remove hardware securing filter to deck and remove filter.
Installation. Install filter in reverse order of removal in step a. Refer to the installation procedures in the
manufacturer's service manual in Appendix B.
4-7.2.6 Seawater discharge pump OFF/ON/START and local START/STOP switches.
Make sure ROWPU control station 1 or 2 Is electrically dead before starting repair
or removal. Redtag switchboard circuit breaker P6 (ROWPU BOOSTER PUMP No.
1) or P7 (ROWPU BOOSTER PUMP No. 2). Redtag circuit breaker with: "WARNING
- DO NOT ACTIVATE. REPAIRS BEING MADE."