Potable Water Systems NSTM 533 Flashcards
Potable water fill connections are ____ inch hose valves for large ships and ____ inches for smaller ships.
- 2 1/2 inch for large ships
- 1 1/2 inches for small ships
If not in use, filling connections shall be closed with screwcaps attached with ________.
Keeper Chains
Potable Water filling connections shall be at least __ inches above the deck with the receiving connection turned down to protect it from contamination.
18 inches
Potable Water filling connections shall be conspicuously designated by a warning plate bearing the
inscription POTABLE WATER ONLY in __ inch letters.
1 inch
Potable Water Hoses shall be labeled POTABLE WATER ONLY at __ foot intervals.
10 Foot
shall be stored with the ends coupled or closed with screw-type caps, in padlocked, ______-proof lockers or cabinets.
Vermin-Proof
Potable Water Hose Lockers shall be located out of the weather, if practical, and at least __ inches off the deck.
18 inches
How often shall P/W in a tank be tested?
at least once daily
During P/W disinfection the halogen compound is added to produce an initial concentration of what?
1.0 parts per million (ppm) chlorine or 0.7 ppm bromine
If the residual is __ ppm or more, and the
pH is 8.5 or less, no additional disinfection may be required.
0.2 ppm
Doubtful Potable Water Quality. Water received from an unapproved source, a source of doubtful quality, or an area where amebiasis or infectious hepatitis is endemic shall be treated to provide at least a __ ppm FAC or TBR residual at the end of a 30-minute contact period in the potable water tanks.
2.0 ppm
EMERGENCY POTABLE WATER TREATMENT. Before nonpotable water can be used for human consumption, sufficient chlorine must be added to maintain at least __ ppm FAC for 30 minutes. Water not treated with a halogen can be made safe by bringing it to a rolling boil in a steam kettle, maintaining the rolling boil for 5 minutes, cooling it, and then bringing it back to a rolling boil and maintaining the boil for another 5 minutes.
5.0 ppm
The MDR will maintain a ___-YEAR, chronological Potable Water Quality Log, e.g., CG-5648, with this information about potable water surveillance. For all water samples taken, the time and date, ship’s location, ship’s water source, and sampling site’s location.
TWO-Year
