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We offer portable pumps
to provide rental solutions for most dewatering applications. To
select the most suitable pump for your application, first consider
the following factors:
- Fluid Type—whether
the fluid being pumped is clean or dirty, contains any solids
or abrasives, or is a hazardous material.
- Flow Rate—how
many GPM (gallons per minute) of pump flow are required.
- Hose Length—the
suction and discharge hose lengths required. Longer hoses increase
line friction, thereby reducing pump performance. Therefore, hose
lengths should be kept as short as possible.
- Suction Lift—the
vertical distance from the surface of the fluid being pumped to
the centerline of the pump impeller. This distance should be kept
to a minimum for maximum pump performance.
- Discharge Head—the
vertical distance from the centerline of the pump impeller to
the point of discharge.
- Dynamic Head—includes
the effect of line friction on suction lift and discharge head.
Total dynamic head equals the dynamic suction head plus the dynamic
discharge head.
- Seepage—the
rate at which the fluid being pumped accumulates at the point
of suction. Slow seepage allows air into the pump suction, which
causes some types of pump to lose their prime.
Basically, there are two categories of pumps
utilized in construction and dewatering applications: centrifugal,
which includes self-priming, trash, and submersible pumps; and positive
displacement, which includes diaphragm pumps of various types.
To determine the type of pump needed for your application, review
the summary below of the types of small pumps and their primary
applications:
Self-Priming Centrifugal Trash
Pumps provide an efficient solution for applications
where the suction lift is less than 25' and the discharge head
is less than 100'. These rugged pumps are capable of passing
up to 25% (by volume) small solids (particles of mud, sand,
leaves, rocks, etc.), up to half the diameter of the suction
port. Hence, a 2" trash pump can pass up to 1" diameter
solids. Trash pumps also provide easy access to the pump body
for cleanout should clogging occur.
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| High-Pressure (High-head)
Pumps are designed for applications requiring a greater
than normal discharge head. Although providing less flow (GPM),
high-pressure pumps can typically operate with a discharge head
two to three times greater than a comparably sized standard
pump.
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Diaphragm Pumps
are ideal for applications involving slow seepage at the point
of suction, due to their great air handling capabilities. Although
slower and less efficient than centrifugal pumps, diaphragm
pumps can operate in conditions where centrifugal pumps would
lose their prime.
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Electric Submersible
Pumps consist of a centrifugal pump closely coupled
to a watertight electric motor with a waterproof power cord.
These pumps operate submerged, thereby eliminating the suction
lift limitations of other types of pumps. Other features include
quiet operation, no engine fumes, and continuous operation without
refueling.
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Hydrostatic Test Pumps are utilized
to pressure test pipelines and pressure vessels in both underground
and above ground applications.
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