. A manual of marine engineering: comprising the design, construction, and working of marine machinery. pumps of the Weir type devoted solely to feed the boilers, and another or auxiliary pump of the same or of the Duplex type as a reserve for the sameservice, and delivering sea or reserve water on deck. Inaddition to these is a fourthauxiliary pump of either type,arranged to draw from thesea, bilges, or tanks, anddeliver on deck or large steamers havingcapacious water ballast tanks, a fifth pump for the purpose of emptyingthese tanks is very generally supplied ; it is also so arr
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. pumps of the Weir type devoted solely to feed the boilers, and another or auxiliary pump of the same or of the Duplex type as a reserve for the sameservice, and delivering sea or reserve water on deck. Inaddition to these is a fourthauxiliary pump of either type,arranged to draw from thesea, bilges, or tanks, anddeliver on deck or large steamers havingcapacious water ballast tanks, a fifth pump for the purpose of emptyingthese tanks is very generally supplied ; it is also so arranged as to doduty as a bilge pump, and delivers overboard only. In all ships it isa great convenience to have an ejector from \h to 2| inches to keepthe bilges quite clear of water with the least trouble. In the Navythere is always a multiplicity of donkey engines; four for supplying theboilers only; and two others, called usually the fire engines, pump fromthe sea to the deck; and two more arranged to draw from the biltres•overboard. Latterly a pump has been fitted in each engine room of naval. Fig. 122.—Peams Double Ram Feed Pump. S44 MANUAL OF MARINE feNGlNEERING. ships to draw water from the hot-well and deliver to the feed tanks. Ifthese pum|)s were arranged to drain the condensers of water and deliverto the feed tanks, a better end would be attained, as the air-pumps wouldbe relieved of the liability to strain from being glutted with water; they would also preventaccumulations of addition to thedonkey engines there isusually a hand pump,which, in the Navy andlarge merchant ships, isso arranged that it canbe worked from themain engines, and haspipes, (fee, fitted, thatit may do the sameduties as the donkeyengines; and in theNavy, in addition tothis, the boilers can beemptied by it, insteadof being blown Board of Traderequire that one of thebilge-pumps shall be sofitted that it can pumpwater on deck in easeof fire. The engine-roompumps should have the
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