The Steam Injector
A theoretical and practical treatise on the design and operation of injectors and on the flow of fluids through and the design of nozzles.

EXHAUST STEAM INJECTORS. 111 Table VIII, shows comparative tests on two exhaust injectors constructed. as shown in figs. 59 and 62 reapectively. TABLE VIII.—-Comparative Tests of Old and New Type Exhaust Injectors. Head of water Sft. in both sets of tests. I.—Old Type. Exhaust steam pressure. Pounds per square inch absolute. Feed water temperature. Delivery temperature. Delivery pressure. Pounds per square inch (gauge). Delivery. Gallons per hour. 16 Deg. Fah. 60 Deg. Fah. 162 80 1,800 18 60 166 92 1,800 20 60 169 100 1,800 22 60 174 110 1,850 25 CO 176 120 1,850 L[.—New Type. 16 \ 60 168 120 1,800 18 60 172 130 1,800 20 60 174 145 2,000 22 60 177 155 2,000 25 60 180 165 2,000 To increase the delivery pressure of the injector at fig. 62 so as to adapt it to work against any pressure, one live steam nozzle h only is employed. With earlier ex- haust injectors, as at fig. 59, both a live steam nozzle as h and a supplementary live steam injector were necessary. To work the exhaust injector when live steam is not available, as, for exainple, when the engine to which the injector is fitted is not working, a connection is provided through which live steam, thruttled down to atmospheric pressure, can flow. In the injector illustrated at fig. 62 such throttled live steam inlet is at k. To ensure the exhaust steam supply to an injector being as diy as possible, the injector støam pipe should be con- nected to the top of the engine exhaust pipe if the latter is