Wschertz@aol.com wrote:

In a message dated 6/5/99 12:53:09,

Perry Mick wrote:

Perry Mick wrote:

What I intend to do is have an either/or switch.  Both pumps would
not be run simultaneously.

Jeff Spitzer wrote:

Better to plumb the pumps so that they can be run together in
launch/recovery mode.  You probably won't react to a pump failure
quickly enough when you're already busy.

Good point, I'm going to rig up two pumps and see if the pressure is not
too  high with both on, seems to work for Ed.

If the Pumps are plumbed in parallel (with check valves), then the pressure
will be the same with either one or two pumps running, ignoring second order
effects due to a slightly increased flow rate.

If the pumps are plumbed in series (ala Jeff's sketch), then the pressures
add.

Bill schertz

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