If the pump were maxed out, the flow rate would be 0 or no flow, as far as
maximum head. If you add a different pump, that has a higher flow rate,
then you should expect the height of the foam jet to increase, but not
necessarily double the flow rating of the pump, double the height of the
foam jet. The friction in the pipes would increase very rapidly increasing
the total head, and therefore, the flow rate would not be double, but would
still be more than the smaller pump. If the actual flow rate doubled, then
I would expect the height of the foam jet would come close to doubling.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html
"LittleScooby" wrote in
message .. .

So if my pump is maxed out with no restrictions, and the foam jet
fountain head is only 2 feet in the air because the pump can't make the
head any higher because it's running at maximum, does it mean that the
pump is at closer to 0 GPH flow rate, regardless of what the chart
says? Because the chart would say 2 feet of head = a much higher flow
rate than if it were at 11 Feet.

Because a normal fountain head could actually go up to 11 feet or
whatever the chart maximum is, but foam jets only ever get to be a
fraction of that height because of how they work.

I guess I just need to confirm that if I have no restrictions on a
pump, and it is powering a foam jet at the foam jets maximum head, does
that mean the pump is very close to 0 GPH (same as if the height were
closer to 11 feet of a normal fountain)?





RichToyBox wrote:
*Pump head is the height the water is pumped to and the friction loss
in
getting it there. The higher the head, the lower the flow rate. At
maximum
head, the flow rate should be zero, and at maximum flow, the head
should be
near zero. In between, the flow is reduced as shown on the chart.
The foam
head has some restriction that acts as friction head. As far as the
height
of the spray, it is a matter of the pressure behind the spray head.
Think
of the height of flow from an open garden hose, and the height of
flow if
the garden hose is put on full stream type spray, but then if the
flow is
restricted enough, as in mist spray, then the height is again
lowered
significantly. I don't know how these factors would affect your foam
head.
--
RichToyBox
http://tinyurl.com/6k2bp
"LittleScooby" wrote
in
message .. .

Can someone point me to a link that describes pump performance a
little
better?

There is a chart, at the bottom of this page:

http://tinyurl.com/4kxjl

But, what I don't understand is, how do you determine the flow rate
in
GPH if when using the pump listed, the maxium HT. of a water
feature
can be only 2 or 3 feet?

The chart says the pump can make the maximum head be 11 feet for
example, with the P1600 pump at which point the flow rate would be
only
220 GPH, but what if you are using a foam jet fountain, of which
the
maximum height can only be 3 feet or so?

Does this mean, that using a nozzle that is limited to 3 feet in
height
is automatically consuming the pumps flow rate so that it would be
the
same as if an 11 foot high nozzle was being used?

I'm a little confused.


--
LittleScooby

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*


--
LittleScooby
------------------------------------------------------------------------
posted via www.GardenBanter.co.uk