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Posted by unclenorm on June 9, 2005, 10:09 am
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Hi Kim,
The pump head is the hight that the pump will raise the water
(or any liquid) above the pump inlet, the depth of water in the sump
has no measurable effect on the pump head, if the return goes over the
top rim of the tank the depth of water in the tank has no bearing on
the head ether. All manufacturers quote the flow rate at various head
heights which they could not do if it depended on water depth in the
sump.
regards,
unclenorm.
kim gross wrote:
> Billy wrote:
> >
> >>Where do you measure from to get the distance for the head above a
> >>sump
> >>pump? Do you measure from the pump in the sump to the water level
> >>in show
> >>tank or do you measure from the top water level in the sump to the
> >>water
> >>level in the show tank? I'm trying to figure out which pump I
> >>need, or is
> >>it better to just get an over sized pump and use a ball valve to
> >>get the
> >>flow to the right rate. Thanks.
> >>
> >
> >
> > You measure from the pump intake to the highest point the water must
> > travel, generally the portion of pipe that snakes over the rim of the
> > tank.
> >
> >
> Billy,
>
> This is not correct it should be measured from the water level in the
> sump to the water level in the tank, the up over the rim, unless you
> have a siphon break at the rim will siphon back down into the tank so
> you do not have to worry about the up and over. Plus in your sump the
> water level in the sump creates a pressure to feed the pump that is
> equal to the height of the water above the pump so the head starts at
> the top of the water in the sump.
>
> Kim
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> sump
> pump? Do you measure from the pump in the sump to the water level
> in show
> tank or do you measure from the top water level in the sump to the
> water
> level in the show tank? I'm trying to figure out which pump I
> need, or is
> it better to just get an over sized pump and use a ball valve to
> get the
> flow to the right rate. Thanks.
>