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Two pipes A and $B$ which are connected in series have a diameter and lengths equal to $250mm,300m$ long for pipe A and, $500mm500m$ long for pipe $B.$ Water flows in the pipe $150\frac{L}{s}.$ The difference of elevation between the entrance and exit of the fipe is $5m.$ Use $n=0\mathrm{.}011$ for all pipes.

A$)$Compute the change in pressure between A and $P_B)$

B$.)$ if pipe A and $B$ will replace with a $300mm$ pipe, what will be the length of the new pipe $($same friction loss and $n=0\mathrm{.}011)$

Oil$($sg $=0\mathrm{.}88)$ flows from tank A through $150m$ long of $150-mm$ diameter pipe new asphalt$-$dipped cast iron pipe to point $B$ shown in figure. What pressure will be needed at $A$ to cause $0\mathrm{.}02\frac{m^3}{s}$ of oil. Use Hazen$-$William formula for friction loss $C=120$

$.$

Answers:

$1.$ PA$-$PB$=86\mathrm{.}1315$ kPa

L$=826\mathrm{.}063$ m

$2.$ PA $=66\mathrm{.}9236$ kPa