However at the midpoint of the circuit the pump is neither pushing or pulling the water are no pressure either positive or negative is being applied.
I'm not sure of your logic there. That's like saying there can't be any current flow at the centre tap of a transformer - and I think Mr Kirchhof has something to say about that. All else being equal every metre of pipe will have the same pressure difference along it's length - and it's that that pushes the water around, not the difference between the pressure inside and outside the pipe or the centre of the pump.
Neutral points are handy concepts in plumbing especially when you have two or more separately pumped (or gravity driven) circuits interconnected - they provide a common reference pressure for the whole system. Rather like us referencing everything to earth. Note that the neutral point isn't necessarily half way around a pumped circuit - you can have almost an entire circuit at +ve or -ve pressure relative to the neutral point, depending on the position of the pump.
However at the midpoint of the circuit the pump is neither pushing or pulling the water are no pressure either positive or negative is being applied.
I'm not sure of your logic there. That's like saying there can't be any current flow at the centre tap of a transformer - and I think Mr Kirchhof has something to say about that. All else being equal every metre of pipe will have the same pressure difference along it's length - and it's that that pushes the water around, not the difference between the pressure inside and outside the pipe or the centre of the pump.
Neutral points are handy concepts in plumbing especially when you have two or more separately pumped (or gravity driven) circuits interconnected - they provide a common reference pressure for the whole system. Rather like us referencing everything to earth. Note that the neutral point isn't necessarily half way around a pumped circuit - you can have almost an entire circuit at +ve or -ve pressure relative to the neutral point, depending on the position of the pump.
