From Griffin Pump & Equipment, Inc.
Vacuum-assisted, non-clog centrifugal
pumps are the most commonly used pumps
for bypasses, because they are capable of
handling large amounts of liquids and solids
and have an air-handling capability.
Submersibles are centrifugal pumps
with a motor directly attached to it in a
common housing and are submerged in
the effluent. Main advantages: Instant priming.
No suction lift limitations, however,
there are minimum submergence requirements.
Their main disadvantages: Physical
size and weight prohibits use through
most access openings. Must be removed
(pulled up) to clean out debris (blockage) lodged in the impeller. If electrical
power is not available close by you
will need a generator. Though not published
on most pump manufacturer's
curves, submersibles require a specific
amount of submergence over the
volute in order to operate properly
and for motor cooling characteristics.
Therefore submersible pumps also
need NPSHA, but it is not as critical as
it is for above-ground centrifugals.
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