. The steam-engine and other heat-motors. f water by the pump. It stops the hammer-blow noise heard inpumps that are pumping dry, as in pumping bilges dry. Ex. 104. A compound engine of 1000 ; cylinder ratio, 1:4;19 expansions; steam at 165 pounds absolute on the piston; revolu-tions, 94; vacuum, 26; using pounds of water per ; injec-tion, 70; discharge, 110° F.; jet condenser; feed-water, 70° F. inriver-mains. Find the size of the feed-pump by calculation or fromcatalog. Assume positions of machinery and other data that may berequired. Use hand-books or other aids. 290 THE ST
. The steam-engine and other heat-motors. f water by the pump. It stops the hammer-blow noise heard inpumps that are pumping dry, as in pumping bilges dry. Ex. 104. A compound engine of 1000 ; cylinder ratio, 1:4;19 expansions; steam at 165 pounds absolute on the piston; revolu-tions, 94; vacuum, 26; using pounds of water per ; injec-tion, 70; discharge, 110° F.; jet condenser; feed-water, 70° F. inriver-mains. Find the size of the feed-pump by calculation or fromcatalog. Assume positions of machinery and other data that may berequired. Use hand-books or other aids. 290 THE STEAM-ENGINE AND OTHER HEAT-MOTORS Ex. 105. Find the size of air-pump for Ex. 104. Ex. 106. Find the size of reciprocating circulating pump. Ex. 107. Find the size of centrifugal circulating pump. Ex. 108. Find the size of a feed-water heater to take care of theexhaust-steam from the steam-cylinders of the above pumps if thedischarge-water be unfit to use. Ex. 109. Design a reheating receiver to superheat exhaust-steam50°. See page Suction, Fig. 152. Centrifugal Circulating Pumps (Fig. 153).—The inner diameterof the driving-vanes should be to I Ad, where d = the diameterof the single suction- or deli very-pipes, and the outside diameter is2 to The width of the vane at its inner diameter is .23to Ad. The width of the vane at its outside diameter may bereduced in proportion to the increase in velocity of the water,Notice proportions in the cut showing double suction-pipes. If the water enters from one side there is an axial thrust whichis avoided by having the water enter on both sides. The shape of the vanes is such that the water may enter with-out shock (see steam-turbine calculations). The velocity at theperiphery must be 25 to 40 feet per second for a friction-head of 5 SMALL AUXILIARIES. 291 to 8 feet, the revolutions varying in general from 150 to 350 perminute.
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