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.

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    a Suitable thermometers should be provided to indicate the temper- ature of the water in the bactericidal vats, and of the rinse waterof dishwashing machines. Thermometers serving sink vats should preferably be of the dial type with the dial attached to the splash plate of the sink or the adjoining bulkhead. If necessary for cleaning purposes, the thermal unit should be removable from the sink. Deep wire baskets should be provided with each sink installed for, or likely to be used for, rinsing and the bactericidal treatment of eating and drinking utensils. Means should be provided for the removal of the baskets from the bactericidal treatment vat without submerging the hands. Long handles of the fixed, folding, or detachable type or any other devices serving the same purpose are acceptable. (2) By immersion of theutensils or equipment in a lukewarm chlorine bath containing at least 50 p.p.m. of available chlorine if hypochlorites are used, or a concentration of equal bacteri- cidal strength if chloramines are used. With this method of bactericidal treatment 3 vats should be provided. One vat is for washing, the second for rinsing, and the third for chlorine immersion. The depth of sinks should conform to those in- dicated in (]) next above. | (3) By exposure of the utensils or equipment in a steam cabinet at a temperature of at least 170° F. for at least 15 minutes, or at a temperature of 200° F. for at least 5 minutes. (4) By exposure of the utensils or equipment in an oven or hot air cabinet at a temperature of at least 180° F. for at least 20 minutes. (5) In the case of utensils or equipment so designed or installed as to make immersion or exposure impractical, the equipment may be treated for the prescribed periods of time either at the temperatures or with chlorine solutions as specified above, (a) with live steam from a hose if the steam can be confined, (b) with boiling rinse water, or (c) by spraying or swabbing with chlorine solution. (6) Any other method which, upon application, has been determined to be effective inthe prevention of the spread of communicable disease. Drinking glass rinsers are satisfactory as an addition to, but not as a substitute for, washing and bactericidal treatment. The potable water line supplying them should be protected against backflow as specified in Mec. 6:\22, a. 26.
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