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Pumpage
Test Of The Vertex Aeration /
Mixing Unit
To Whom It May Concern:
This
is to advise that the Vertex™ CoActive
AirStation™ was tested at a
Clean Water Testing Facility on June
28, 2001. This testing procedure
was designed to demonstrate the ability
of the Vertex™ unit to pump
and circulate water in lake, reservoir,
or other basins.
This
is to certify that the test procedure
and the test apparatus were operated
in accordance with testing plan and
procedures attached herewith. The
testing was conducted inside a stainless
steel tank 8 feet x 25 feet x 16
feet sidewall depth and utilized
one Vertex™ CoActive AirStation™ diffuser
mounted in a cylindrical draft tube.
This device was used to create vertical
flow streams generated by the diffuser,
whose velocities could be measured.
The test procedure was designed to
measure the direct pumpage of the
Vertex diffuser unit. The aeration
unit could be moved to submergence
different depths so that the pumpage
rate of the unit could be measured
at these depths. Thus, a pumpage
curve could be created for the unit
at different submergence depths.
It should be recognized that the
direct pumpage was the only measurement
conducted. Total circulation capability
of the device includes the direct
pumpage plus secondary pumpage created
by induced flow entrained during
the rise of the air bubbles from
the diffusers.
The
testing procedure employed two 9
inch disc diffuser units. The units
were installed in a draft tube. Velocities
of the liquid pumped through the
draft tube were measured after the
flow had stabilized and then at 30
second intervals at multiple locations
over the surface of the draft tube.
The velocities were averaged to generate
a typical average velocity through
the draft tube. This allowed calculation
of the approximate pumpage of the
diffuser units using the relationship:
Flow, Q = Area (A) x velocity (V).
The velocities and the resulting
pumpage rate data of the unit at
various depths are attached herewith.
The testing was witnessed by Mr.
Cary Martin, Sales Manager, Vertex
Water Features, Dr. Henry Liu, Professor
Emeritus, Civil & Environmental
Engineering Department, University
of Missouri and myself.
I
certify the testing procedures outlined
above and the test apparatus are
as described in this document and
the test results.
Sincerely,
Shankha K. Banerji,
Ph.D., P.E.
Missouri Professional Engineer
License No EN-016558
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