SECTION VI. PREPARATION FOR STORAGE OR SHIPMENT

TM 55-1905-223-24-7

SECTION VI. PREPARATION FOR STORAGE OR SHIPMENT

2-34. Preserve Reverse Osmosis Element. In preparation for a shutdown of two weeks or more, it is important to

preserve the RO elements from the damaging effects of bacterial contamination that would otherwise occur in the trapped

water. This procedure covers closed loop circulation of a sodium metabisulfite solution (package No. 3 of the cleaning kit

listed in the MAC, Appendix C) to preserve the membranes of the pressure vessel.

NOTE

The growth and decomposition of biological matter causes odors and

gases to pass through the membrane pores into the product water. This

causes a sulfur odor in the water which will last for several hours.

a. Turn HIGH PRESSURE BYPASS valve counterclockwise to OPEN.

CAUTION

Failure to open this valve will result in hydraulic shock to the system.

b. Turn CLEANING VALVE counterclockwise to OPERATE (arrow down).

Switch water quality monitor POWER to ON (up).

d. Switch POWER SWITCH to ON (up).

e. Observe positive reading on low pressure gauge.

Slowly turn HIGH PRESSURE BYPASS valve to RO.

g. Observe that water quality lamp (red) goes off and high quality lamp (green) comes on. (Allow 2 minutes.)

h. Switch POWER SWITCH to OFF (down).

Turn HIGH PRESSURE BYPASS valve counterclockwise to OPEN.

Turn CLEANING VALVE clockwise to CLEAN (arrow up).

Switch water quality monitor POWER to OFF (down).

Close feedwater inlet valve.

m. On both micron prefilters, loosen upper clamps.

2-118