Principles of sanitation applicable to the construction of new vessels.

Date:
[1949]
Catalogue details

Licence: Public Domain Mark

Credit: Principles of sanitation applicable to the construction of new vessels. Source: Wellcome Collection.

    18/122 (page 4)
    bottom tanks used for the storage of liquids. (See Fig. 1,A) If an operating deck, platform, or grating is installed in the vicinity of the potable water tank and near the inner bottom plating, it is preferable that the bottom of the potable water tank be above such operating deck, platform, or grating. (See Fig. 1,B) In the absence of inner bottom plating, the bottomof the potable water tank should be at least 18 above the lowest point of the bilge space (not a sump or drain well). (See Fig. 1,C) The bottom of a potable water tank may be formed by the inner bottom plating if (1) an 18-inch deep void space is fitted underneath, (2) there are no means whereby the void might be filled, and (3) the void space and the inner bottom plating around the tank are provided with means for adequate drainage. (See Fig. 1,D) In cases where the material of which a tank is constructed requires coating, such coating should not render the water stored therein unfit for human consumption. Objections will not be raised to the use of a particular tank lining until such time as tests reveal that it is ad- versely affecting the quality of the potable water. No deck or sanitary drain, or pipe carrying wash or salt water or other non-potable liquid should pass through the tank or directly above any manholes in it. Tunnels through potable water tanks for such pipe should be completely drainable. Horizontal tunnels should be made of heavy plate and placed on a continuous slope, and the pipe therein should be extra-heavy with butt-welded joints. The potable water tank should be conspicuously labeled ‘‘POTABLE WATER”’. Vessels using tanks not meeting the recommendations relative to the shell of the ship, decks, inner bottom plating, common partition, and bilge should provide suitable treatment for water drawn from those tanks prior to its use as potable water. 1.4 STORAGE TANK APPURTENANCES 1,41 Vents. The potable water storage tank should be provided with a vent of adequate size, preferably not less than 14 in diameter, located, constructed, and screened so as to prevent the entrance of insects, ro- dents, dust, water, or other contaminating substances. Screen on the PLATFORM VOID TANK A B C OD ACCEPTABLE LOCATION OF POTABLE WATER TANKS IN RELATION TO BILGE OR INNER BOTTOM TANK FIG. |