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Water flow horizontally for 4 m through a 65mm diameter cast iron pipe at an average...

Water flow horizontally for 4 m through a 65mm diameter cast iron pipe at an average velocity of 2 ms-1before an 90 degree elbow changes the direction of the flow downwards for a further 9 m. A ball valve is fitted at the end of the 9 m length of pipe. Determine the pressure at the pipe inlet if the ball valve is fully opend.(density of water = 998 kgm-3 , u=8.9*10^-4 Pas)

I just calculated the friction losses before the direction changed, and from the Moody's chart, I got friction factor is around 0.026, the value of friction losses I got is 3193.6

And what should I do next?

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