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low velocities in the system

Hello,

i am working on design for small plan potable water network + fire using waterGems select series 5

after i have set the pipe sizing to satisfy successful fire flow results i have found very low velocities(0.01 m/s), however it is been noticed that the velocities of maximum pipe (in fire flow results flex tables) are quiet high (3.9 m/s) 

i tried to increase pressure but nothing changed. and when i try to decrease diameters it will not give me a big difference but the fire flow analysis will fail.

regards