Exercise

Water is flowing in a pipe system as shown in Figure $2.$ The pipe is cast iron having

Hazen William's coefficient, C$=130.$ The coefficient for equivalent pipe length for

minor loss $($ alpha $)$ for the pipe entrance and for the stop valve is $36$ and $16$ respectively

$($Malaysian Water Association$).$ Be reminded that the equivalent pipe length in

meter is L$\_($eq$)=$aD$,$ where D is the inner pipe diameter. Determine the total pressure

$($in kPa$)$ at the stop valve if the valve is closed in:

a$.0\mathrm{.}4$ second

b$.60$ seconds

c$.120$ seconds

please show answer step by step