have your inlet pipe diameter equal to, or larger than, the discharge
line. This helps prevent cavitation.
friction losses by using large diameter pipe. Determine the approximate
flow rate you want, and the total length of your pipe. Consult The
Water Garden's friction
loss chart and calculator to choose the proper diameter pipe.
(The size of the pump’s suction and discharge ports
does not indicate your proper pipe size.) Choose a pipe diameter
that keeps your friction loss below about five feet per hundred feet
of pipe. Even if you have a section of small diameter pipe that you
can’t change, as with a through the wall fitting, it is still beneficial
to use larger pipe on the majority of the run. The following chart
can help you determine your correct pipe diameter.
Max. Recommended Flow
1/2" flexible PVC pipe
flexible PVC pipe
- Use a
filtration system that does not require a lot of pressure. It costs
money to create pressure. Biological filters work well and require very
allow a out-of-pond centrifugal pump and motor unit to become submerged.
Use a GFI circuit for protection. If this ever accidentally occurs,
shut the unit down, disconnect it, and have a reputable service shop
examine the motor before re-using it.
run a pump dry. This may damage the mechanical seal and impeller. They
are designed to pump fluid, not air. Insure the pump is full of water
before you turn it on, and that it doesn’t out pump the supply. Note:
if you have purchased a dry run seal, it can run without water for a
limited period of time.
the pump and motor unit with a suitable shelter. When protected from
rain and dust the motor will last longer. The covering should allow
the motor to have suitable air recirculation for proper cooling.
- If your
pump is producing too much flow, you can reduce the flow by partially
closing a valve on the discharge line. Never restrict the inlet!!! Always
allow a couple gallons per minute to flow to prevent heat build up inside
the pump housing.
- If more
flow is required than a single pump can produce, consider using two
or more pumps in parallel. This also offers the benefits of being able
to vary the flow rates, insure partial flow if one units needs servicing,
and can often save a substantial amount of electricity compared to using
a single, larger pump.
a pump that can give you the required flows at the lowest possible power
consumption. Since pumps often operate continuously, the power consumption
(watts - not amps), and its effect on your monthly utility bill can
be very significant.
to be sure the motor electrical connections are set up to match the
shut off valves before and after the pump, so you can easily remove
it from the line without having to drain your system. Be sure
to use ball valves, as they have low friction loss characteristics.
- Use Teflon
paste (not tape) for sealing threaded joints.
sure all your pipe joints are airtight. This is especially important
on the suction side.
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