TM 55-1925-282-14&P
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4. Remove the four bolts (figure 2, item 1), the four lockwashers (figure 2, item 2), and the four flat washers
(figure 2, item 3). Discard the lockwashers.
5. Remove the U-brackets (figure 2, item 4) and the membrane and vessel subassembly (figure 2, item 5).
INSTALLATION
1. Install the membrane and vessel subassembly (figure 2, item 5), and secure it in place with the U-brackets
(figure 2, item 4), four sets of bolts (figure 2, item 1), four new lockwashers (figure 2, item 2), and four flat
washers (figure 2, item 3).
2. Install the hoses (figure 1, item 1) on the applicable membrane and vessel subassembly (figure 1, item 2)
using the labels from step 3 of Removal as a guide. Tighten finger tight plus one turn. Discard the labels.
3. Remove the lockouts and tagouts (FM 55-502).
4. Conduct fresh water flush (WP 0005 00) on the applicable ROWPU.
5. Conduct an operational test of the applicable ROWPU by completing the startup procedure (WP 0005 00)
and observing normal operation indications.
6. Check for any leaks at the applicable membrane and vessel subassembly.
7. Return the equipment to the desired readiness condition.
REVERSE OSMOSIS (RO) MEMBRANE AND VESSEL SUBASSEMBLY REPAIR
DISASSEMBLY
1. Perform the Membrane and Vessel Subassembly Replacement Removal procedure in this work package.
2. Remove the product water fitting (figure 3, item 1) from the high pressure vessel (figure 3, item 2).
3. Remove the three allen head screws (figure 3, item 3) from each end of the high pressure vessel (figure 3,
item 2).
4. Push inward on each end plug (figure 3, item 4), and remove the three piece segment ring (figure 3, item 5)
from each end of the high pressure vessel (figure 3, item 2).
5. Remove the high pressure fitting retainer (figure 3, item 6) from each end of the high pressure vessel
(figure 3, item 2).
6. Remove the high pressure fitting (figure 3, item 7) and O-ring (figure 3, item 8) from each end of the high
pressure vessel (figure 3, item 2). Discard the O-ring.
7. Loosely install the three allen head screws (figure 3, item 3) into each end plug (figure 3, item 4) inside the
high pressure vessel (figure 3, item 2).
8. Use the three allen head screws (figure 3, item 3) as a handle to remove the end plugs (figure 3, item 4) from
the high pressure vessel (figure 3, item 2). Discard the two O-rings (figure 3, item 9) on each end plug.
9. Remove the RO membrane element (figure 3, item 10) from the product water side of the high pressure
vessel (figure 3, item 2). Discard the RO membrane element, the two product water O-rings (figure 3,
item 11) and the brine seal (figure 3, item 12).
10. Use a clean rag and clean water to remove any biological film or debris from the interior of the high pressure
vessel (figure 3, item 2).
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