Do not operate heat recovery distilling units not equipped with a sterilizer in
(4) Do not transfer distillate ("product water" from the distiller/evaporator) to the ship's
potable water tank if the chloride content exceeds 2.3 ppm.
(5) Do not transfer permeate ("product water" from the RO) to the ship's potable water tanks if
g. Disinfection of Distilled Water. Regardless of the method of distilling plant operation, the resulting
distillate water shall be dis infected by the addition of a halogen compound before the water is
considered safe for human consumption.
Disinfection of Water (Batch Chlorination Method).
To avoid injury, all personnel performing chlorinating procedures shall wear
safety gloves, an apron, and a face shield. Smoking is not permitted during
a. If a shore facility's water supply does not contain a n FAC residual of at least 1.0 ppm, then the
watercraft commander will be responsible for the addition of sufficient chlorine to maintain at least a
1.0 ppm FAC residual in the potable water distribution system. Since there is no automatic
disinfection equipment aboard, the below batch chlorination procedure must be used.
(1) Determine the capacity (in gallons) of the potable water tanks from nameplate data or
applicable technical manual.
(2) Using the chlorine dosage chart (Table B-2), determine the amount of chlorine necessary to
treat the water. (Consult local medical authorities for additional information).
(3) Prepare the chlorine solution. Calcium hypochlorite is a solid, which does not readily
dissolve in water. Use of this agent will require mixing with the appropriate amount of water to
form slurry, allowing the solids to settle for 10-15 minutes, and using the supernatant liquid
(clean liquid) to accomplish disinfection. The remaining solids can be dissolved in more water
and used for disinfection, or discarded. If the solid matter is not to be reused, it will be handled
and disposed of as hazardous waste. If sodium hypochlorite (common household bleach) is
used, no mixing is necessary. It may be introduced directly into the potable water tanks.
(4) Add the chlorine solution (not solid materia l) into the tank preferably when empty or 1/4
full of water. The chlorine solution may be introduced through the potable water riser or