A VFD is an electrical system that controls an AC motor.
AC power is converted to DC power, then the DC supply altered, and then the DC is converted back to AC in order to control the speed of the motor. It doesnt convert 1phase to 3 phase.
The basics are shown...
10 States usually call for 24hours of storage. This gives you time to drive somewhere, but a well pump or part, drive back and get it back in operation before your customers run out of water!
Sprinklers are to stop the fire from spreading. Once the FD shows up and hooks to the hydrant, the sprinkler flow can be ignored since the FD will be using the hydrant to extinguish the fire and, if they want to, will hook a pumper up to the FDC to maintain flow to the sprinkler system.
Do you still have a demand at the node?
Change the demands to zero to stop flow, simply closing a valve doesnt work as the program attempts to get flow to that node
I would recommend you visit several plants that have surface water intakes and get input from operators before starting your design. You may find that they had to modify what someone found in a book!
