Understand vacuum-system fundamentals - Graham

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lb/hr motive steam = 892.4 C d D n 2 (Psia/Vg)0.5 where Cd = Nozzle discharge coefficient D=Nozzle throat diameter, in. Psia = Motive steam pressure at ejector, lb f /in2 V g = Motive steam specific volume, ft3/1b. Motive steam quality is important because moisture droplets affect the amount of steam passing through the nozzle.

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