Re: Flow splitting

"bendel boy" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> If I have a centrifugal pump, and want to split the flow down two
> pipes, what controllability issues might I have if I use two
> flow-controlled valves, one on each leg?

(a) This is done all the time. If the equipment is correctly sized, it
should not be a problem.

> My first degree-of-freedom analysis indicated that I have two degrees
> of freedom - so I can control the total flow and the flow down one
> leg.

(b) In general, if you put a total flow control valve in the common line,
then you must put a flow control valve in one of the branches and a back
pressure control valve in the other branch. I prefer option (a), it is
simply and has less pressure drop.