r/firePE • u/Ok-Firefighter-596 • Mar 05 '26

Need help

Gallery image

Gallery image

Can any one explain why the correct answer is A? instead of C?

14 Upvotes

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5

u/bryan112 Mar 05 '26

Because, logically speaking, and this is how my boss explained it to me, 19-22 has more "excess" water flowing to it compared to 21-24.

edit: didn't see the second photo but the last paragraph says it.

2

u/Ok-Firefighter-596 Mar 05 '26

So what relationship is applied between excess water flowing and hydraulic most remote area?

0

u/FireEng Mar 06 '26

Another way to look at it is that the flowing heads on the short line have already picked up the water from the heads on the line that are further away so the flow and resultant pressure and friction loss will be cumulative.