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I am getting zero flow in pipes even tough its junction has demand

I have checked but cant seem to find a problem, please suggest what is the issue many of my pipes are showing 0 flow. 

And is the tank specs correct in my network please checkonce, i have a tank with GL 197, at a height 0f 25m from ground and has flow coming in for which ihave used negative flow junction as suggested by bentley support.

And the hydraulic grade is also very similar at all the junctions is that a problem? 

I am attaching my model