residual head on pump-system curve
residual head on pump-system curve
(OP)
Hi every one!
Could some one perhaps explain to me how to indicate the residual head at the pipe exit (for example fire hydrants) on the system curve. As far as I understand it the system curve stop at the end of the pipe. Your advice would be appreciated.
have a nice day
Could some one perhaps explain to me how to indicate the residual head at the pipe exit (for example fire hydrants) on the system curve. As far as I understand it the system curve stop at the end of the pipe. Your advice would be appreciated.
have a nice day





RE: residual head on pump-system curve
The pressure you get (which I think you call residual pressure) is what is available at the hydrant.
RE: residual head on pump-system curve
The raised curve would show the 'residual pressure' when flow was zero. This would give the pump head required at any given flow to provide the desired residual pressure at the hydrant.
RE: residual head on pump-system curve
Usually you are looking to meet a specified flow and pressure at the hydrant(s) and this is your boundary condition. other points on the system curve are derived from additional flows from other uncontrolled system demands and it is necessary to include maximum and minimum anticipated flows to draw a system envelope.
There is no reason to stop your system curve at the hydrant. If you really require a "comprehensive" solution including losses through the hydrant and connected downstream pipework system then you can continue the system curve through to the point of downstream control - i.e to the downstream boundary where there is a defined relationship between pressure and flow.