 The
Evacuator™ II Pump uses down-well internal logic
combined with a small diameter float to automatically cycle the
pump, eliminating the need
for additional controls at the surface. For the 2 in diameter pumps, this
logic technology allows the pump to use a much smaller float and fewer components
than those using a mechanical type of design. Hence, this pump, with just a
33 in length will produce flow rates up to 4 gpm in the bottom loading
configuration. As the pump fills with fluid, the float moves to the upper
position activating the pneumatic logic. This opens the air valve located
in the well
clincher allowing air to pressurize the chamber, closing the check valve
and pushing the fluid to the surface. When the fluid is evacuated, the float
falls
to the lower position where it activates the lower logic opening the air
exhaust port. As the pump fills with fluid under static pressure, the air
is exhausted
and the cycle is repeated until the water table reaches the desired draw-down.
The Evacuator II is constructed from stainless steel with a Nitrophyl
float and Viton® seals providing chemical resistance for most
applications. Complete access to all internal components is provided
with the three-piece thread-together construction. Maintenance will
vary based on the site conditions. Conditions with high mineral concentrations
may require routine cleaning. The Evacuator II style pump requires
good air quality and an air drier is recommended. It is important
to ensure that all air lines are purged to remove debris prior to
start-up.
Loading Configurations
Top loading pumps are selected for total fluids
applications, the recovery of LNAPL and ground water simultaneously.
Fluid enters
the top inlet and the water table will be maintained at this
point. The
top loading pumps will produce flow rates up to 2.5 gpm,
dependent on the head above the pump.
Bottom loading pumps are selected to pump dissolved
phase product, DNAPL or leachate. When installing the pump, the
head of the pump
is positioned at the depth of the desired water table draw- down.
Bottom loading pumps will produce flow rates up to 4 gpm.
View animated graphics for top-loading
pump and bottom loading pump.
The
Well Clincher is an integral part of the system and serves
as a well seal, pump support and houses the air control valve.
The underside of the well clincher
has color coded, PushLok® fittings for the air logic line connections
and barb fittings for the 1/2 in air supply and 5/8 in fluid discharge hoses.
A
12 in chain is provided to attach the pump support cable. The air supply
and fluid discharge lines are easily connected to 90-degree fittings on the
top of the
clincher. The built-in handle makes it easy to lower or remove the pump.
A
coalescing air filter and regulator assembly is included with each
Evacuator™ II Pump system. This must be installed at the
well head to ensure proper air pressure and filtration is being supplied
to the pump. In freezing or high humidity conditions, an air dryer
may be needed to ensure correct operation. The filter/regulator attaches
directly to the Well Clincher.
Tech Tip: A good guide line for setting the air pressure is 0.5 psi
per foot of depth.
Hose Assembly
The standard hose assembly contains five hoses in a PVC jacket to
simplify installation. The assembly, TR-731, contains three 1/8 in
Nylon air logic lines, 5/8 in Nylon fluid discharge and 1/2 in polyethylene
air supply and exhaust lines.
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Dissolved
phase
