. The steam-engine and other heat-motors. ressure of a pipe 6 in diam-eter, 150 long, containing 4 elbows anl 2 globe valves (wide open),if the steam velocity is 8000 per minute. Initial pressure at theboiler, 125 pounds gage. Ex. 40. Find the size of the steam-pipe and of the steam- and ex-haust-ports of a Corliss engine. Assume length of port = diam. ofcylinder. Stroke = 3 diameters, = 45, initial pressure, 75 ; non-condensing; cut-off J stroke; revs. 94. Ex. 41. Engine 12X12, 300 revs., = 100 at 100 lbs. ini-tial pressure, and J cut-off, back pressure 16 pounds absolut
. The steam-engine and other heat-motors. ressure of a pipe 6 in diam-eter, 150 long, containing 4 elbows anl 2 globe valves (wide open),if the steam velocity is 8000 per minute. Initial pressure at theboiler, 125 pounds gage. Ex. 40. Find the size of the steam-pipe and of the steam- and ex-haust-ports of a Corliss engine. Assume length of port = diam. ofcylinder. Stroke = 3 diameters, = 45, initial pressure, 75 ; non-condensing; cut-off J stroke; revs. 94. Ex. 41. Engine 12X12, 300 revs., = 100 at 100 lbs. ini-tial pressure, and J cut-off, back pressure 16 pounds absolute. Designa valve to cut off at f stroke, head end, with an overtravel = \ widthof port. Assume exhaust lap = 0. Assume length of port = thediam. of cyl. Ex. 42. Design the valve for the cylinder of a triple-expan-sion engine. Diam. cylinder is 72, stroke 5, revs. 75, cut-off at , steam-lead angle 15°, exhaust opens at stroke, length ofconnecting-rod 15. 122 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. ? Steara go W per cent of Horse Power eoibs Boil erTress. 1 7: 90per cent of ideal.• Horse Tower £S i l
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