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Pressures below the lowest physically possible pressure in the system at one or more time steps and Fire Flow at a node with EPS?

I created a model from the field conditions that has two pressure zones (High and Low), these zones are separate for PRVs and pipes closed, each zone has its own tank and pumps (wells) that provide the flow. But, when I applied a fire flow analysis of 3hr- @1750gpm (that is supposed to work), the pumps can't deliver the head.

The node is in the high-pressure zone near the tank.

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