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Why two pumps?
Why two pumps for some fountains? Some fountains and
water features require 2 pumps or
more, we often get asked why will one pump not work? The answer is simple,
one pump is not enough, as the pictures below show.
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This picture shows an EFN 150 pump with a
Schaumsprudler22-5 nozzle Its not high, but it works well |
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Here is the same EFN 150 pump with a Schaumsprudler 35-10e
nozzle (connected via a 1/2 -1 inch adapter) You can see the flow
is quite feeble, this is because the EFN 150 pump can not pump
enough water to operate the nozzle (water demand) |
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This is a EFN 350 pump with the same Schaumsprudler 35-10e
nozzle looks better, doesn't it. That is because the EFN350 can pump
more water than the EFN 150 |
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This 2m diameter spray ring requires 2 EFN 450 pumps to operate
correctly because one pump could only make the jets reach 1 metre
high, not 2 metres as shown in this picture |
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The number /size of pumps also depends on
the height the water must reach, in particular spray rings (and
waterfalls) since these have a high water demand and this can
not always be met by one pump alone. Quite often a single pump can
be used but it will need to be a 3 phase pump, and as such costs
considerably more, and not all installations have a 3 phase
electricity supply. We also had an enquiry for a
water fall 2 M high and 2M wide it needs 2 pumps to give a
reasonable flow, (Two small pumps to keep within the budget) the
person enquiring could not understand this. They seemed to think
they knew better, they never did get their waterfall
Pump information index
added 01 09 07 |
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