The figure shows a spraying system for rinsing portions of a car in a car wash A

Question

The figure shows a spraying system for rinsing portions of a car in a car wash At section I. the pressure is measured by a gage to he 50 psig. The water is routed through a gate valve, and then through a meter (K-6) that records total flow delivered. Downstream of the meter, the flow line splits at section A. One line leads to a nozzle at B (K-30). while the other line is routed up to the ceiling and hack down to a nozzle (K-30) at C. which is at the same elevation as B. The nozzles both expand the water to atmospheric pressure in the form of sprays. The flow line is Vt standard type K copper tubing The tube lengths are: I to A. 2.5 m; A to B. Im. and A to C. 7 m Determine the flow rate of the water delivered to each nozzle. Assume that the friction factor only depends on relative roughness. Modify the system accordingly to make sure the flow rates coming out of both nozzles are the same.

Explanation / Answer

Solution:

Pressure in line is given as 50 psi = 3.44 bar

K for both nozzle or sprinkler is given as 30

therefore

discharge in LPM through sprinkler is given by Q = k p 0.5

= 30 x 3.44 x 0.5

= 51.6 LPM

Both sprinklers ara at same pressure therefore discharge will also be same thats is 51.6 LPM.

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