"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . uch a manner that the water will all pass by C to the wet pumps are generally of the three-valve marine type, but incertain cases the dry pump may be of the suction valveless type. The first and most important difference from an ordinary twinpump consists in the dry pump discharging th
"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . uch a manner that the water will all pass by C to the wet pumps are generally of the three-valve marine type, but incertain cases the dry pump may be of the suction valveless type. The first and most important difference from an ordinary twinpump consists in the dry pump discharging through the return pipeE, through a spring-loaded valve F, into the wet pump at a pointbelow its head valves. The next point concerns the supply of waterto the dry pump for water sealing, clearance filling, cooling, andvapour condensing. When starting the pump the filling valve Gmust be opened for a minute or so to enable the vacuum to draw in^6 686 Verbal Notes and Sketches a supply from the hotwell of the wet pump. The valve is thenclosed, and the water passes from the hotwell of the dry pump by thepipe H to the annular cooler, and after being cooled passes into thesuction of the dry pump, then, passing through the pump, it becomesheated and again passes to the cooler, and so on in a continuous. jaro^uaw^ P=^ closed circuit, any excess passing over the pipe E to the wet spring-loaded valve F is adjusted to maintain about 20 in the dry pump hotwell when the condenser is working at28 in. vacuum, and this 8 in. difference of pressure is sufficient tocause the water to overcome the cooler friction and pass into the
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