Text-book of hygiene; a comprehensive treatise on the principles and practice of preventive medicine from an American stand-point . alve, the full diameter of the pipe, operated atthe valve and also by means of a rod from the deck above. Branchesfrom this main drain are led through the center-line bulkhead andfitted with valves at the end, so that all of the main machinery com-partments are connected directly to this large emergency drainagepipe. Each steam-pump throughout the machinery space, which in anymanner is connected with drainage, has a suction connection with themain drain, so that o
Text-book of hygiene; a comprehensive treatise on the principles and practice of preventive medicine from an American stand-point . alve, the full diameter of the pipe, operated atthe valve and also by means of a rod from the deck above. Branchesfrom this main drain are led through the center-line bulkhead andfitted with valves at the end, so that all of the main machinery com-partments are connected directly to this large emergency drainagepipe. Each steam-pump throughout the machinery space, which in anymanner is connected with drainage, has a suction connection with themain drain, so that one pump or all pumps may be made to work onthis pipe whenever required to do so. The main drain is used onlyin case of an emergency, that is, when the water in any compartmentis found to be rising above the floor-plates and cannot be controlledby the other drainage connections. Such an emergency would ariseonly on account of a vessel striking rocks or taking ground, thusinjuring the inner bottom and causing a leak of great magnitude, orby a torpedo striking below the water line and injuring one or morewatertight OUTSIOt PLATING .DOCKING KEELS Fig. 33.—Cross-section of Ship, Showing Arrangement ofDrainage System. (299) 300 TEXT-BOOK OF HYGIENE. By surface drainage is meant the drainage of all water that col-lects on top of the inner bottom in engine- and boiler- rooms, in store-rooms or other places throughout the whole length of the ship, not indouble bottoms. Each watertight compartment throughout the lengthof the inner bottom has provided at its lowest part what is knownas a bilge-well (see Fig. 33), that is, a rectangular, cup-shaped de-pression about 10 x 18 x 6 inches, worked into the inner bottom plat-ing. Into these bilge-wells the suction ends of all the suction pipesare placed, so as to provide the conditions for each compartment be-ing pumped as dry as possible. The principal pipe attending to sur-face drainage is called the secondary drain (see Fig.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherphila, bookyear1908
