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.

OVERFLOW ARRANGEMENTS. 55 that near to the outlet end of the latter, for the tempera- ture of the water jet at the latter point is higlier than 212 deg. Fah, and its pressure greater than atmospheric. The following table gives typical examples of the pressure at the overflow gap between the combining and delivery nozzles when the feed water is hot and the steam pressure high. Of course, such overflow pressure should, under perfect conditions, be an amount exactly corresponcl- Fig. 32. ing with the temperature of the jet, but in practice it varies with the pressure against which delivery is being effected. TABLE V.—Showing Pressurk at Overflow Gap between Combining and Delivery Nozzlks of an Injector. Steam pressure. Lbs. per sq. in. absolute. Feed-water temperature. Deg. Fah. Pressure at overflow gap between combining and delivery nozzles. Lbs. per sq. in. absolute. 200 126 40 205 126 43 210 126 47 215 126 50 220 126 55