TM 55-1925-282-14&P
DIRECT SUPPORT MAINTENANCE
REVERSE OSMOSIS WATER PURIFICATION UNIT FOR
INLAND AND COASTAL LARGE TUG (LT)
PREFILTRATION SUBASSEMBLY, REPLACE
INITIAL SETUP:
Materials/Parts (continued):
Tools and Special Tools:
Nut, Self Locking (Qty 4) (Item 17, Figure 4,
Tool Kit, General Mechanic's (Item 1, Table 2,
Filter Element (Item 5, Figure 4, WP 0033 00)
Filter Element (Item 10, Figure 4, WP 0033 00)
Materials/Parts:
Lubricant,Silicone (Item 11, Table 1,
Personnel Required:
Two Watercraft Engineers, 88L
Rag, Wiping (Item 14, Table 1, WP 0035 00)
Tag, Danger (Item 17, Table 1, WP 0035 00)
References:
Prefilter Assembly (Item 1, Figure 4
FM 55-502
Prefilter Assembly (Item 7, Figure 4
O-Ring (Item 2, Figure 4, WP 0033 00)
O-Ring (Item 9, Figure 4, WP 0033 00)
REMOVAL
1. Shut down the applicable Reverse Osmosis Water Purification Unit (ROWPU) (WP 0005 00).
2. CLOSE, lock out, and tag (FM 55-502) out the applicable inlet sea water supply valve as shown in table 1.
3. Perform Fresh Water Flush (WP 0005 00) for the applicable ROWPU.
4. Slowly, OPEN the filter bleed screw (figure 1, item 1) on top of the filter housing lid (figure 1, item 2).
5. Allow any pressure to vent, or any fluid to drain.
6. If applicable (table 1), remove the gauge (figure 1, item 3) from the filter housing lid (figure 1, item 2), and set
aside.
7. Remove the inlet hose filter nut (figure 1, item 4) from the filter housing (figure 1, item 5).
8. Remove the outlet hose filter nut (figure 1, item 6) from the filter housing (figure 1, item 5).
9. Remove the four bolts (figure 1, item 7), eight flat washers (figure 1, item 8) and four self locking nuts (figure
1, item 9) that secure the filter housing (figure 1, item 5) in place. Discard the self locking nuts.
10. Remove the filter housing (figure 1, item 5).
Table 1. Filter Assembly Installation Guide
ROWPU
Specific Filter
Valve
Gauge Installed
Plug Installed
1
20-Micron Filter
RO-V-1-1
No
Yes
1
5-Micron Filter
RO-V-1-1
Yes
No
2
20-Micron Filter
RO-V-2-1
No
Yes
2
5-Micron Filter
RO-V-2-1
Yes
No
0025 00-1
