Inlet 4 ft Outlet Figure 645 Distilled water in a pressur iz

Inlet 4 ft Outlet Figure 6.45 Distilled water in a pressur ized tank.

Solution

The pressure at the outlet vale is 25 psig.

use P + rhox g xH = constant since there is no appreciable flow in the tank.

if pressure at top of tank desired, this is a drop in head of 48 in.

density of water 62.4 lb/ft^3

pressure due to 4 ft is rho*g*H = 62.4* 32.2 *4 lbf/ft^2 = 1.733 lbm/in^2

Pressure at top of tank becomes less by 1.73 psi (mass units)