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Plant Leveling Tank
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h2. Plant Leveling Tank {float:right|border=2px solid black|width=200px} {anchor:plant leveling tank connection}[!Pilot Plant- Sedimentation Sludge Blanket Tank^IMG_0979.jpg|width=200px!|Pilot Plant- Sedimentation Sludge Blanket Tank^IMG_0979.jpg] h5.Connection to Plant Leveling Tank {float} |
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{float:right|border=2px solid black|width=200px}
{anchor:plant leveling tank}[!Pilot Plant- Sedimentation Sludge Blanket Tank^IMG_0974.jpg|width=200px!|Pilot Plant- Sedimentation Sludge Blanket Tank^IMG_0974.jpg]
h5.Plant Leveling Tank
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The
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plant
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leveling
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tank
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will
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handle
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the
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outflow
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from
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both
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the
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floc
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blanket
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tank
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and
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the
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plate
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settler
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tank.
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Using
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one
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leveling
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tank
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and
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identical
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inlet
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and
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outlet
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piping
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for
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the
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two
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tanks
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ensures
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identical
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flow
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(assuming
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that
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differences
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in
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the
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loss
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coefficients
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through
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the
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tanks
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themselves
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are
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negligible).
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We
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decided
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to
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make
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the
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head
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loss
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through
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the
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leveling
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tank
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the
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dominant
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head
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loss
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through
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the
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system,
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which
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then
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sets
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the
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flow
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rate
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through
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the
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sedimentation
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tanks.
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Our
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design
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for
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the
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outflow
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system
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was
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a
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surface
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piercing
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7.62cm
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(3")
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pipe
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with
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an
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orifice
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cut
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into
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the
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pipe
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below
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the
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water
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level.
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It
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was
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desired
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that
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the
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flow
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rate
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through
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the
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sedimentation
...
tank
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would
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remain
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constant
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at
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24
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L/min
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no
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matter
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the
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flow
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rate
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coming
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into
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the
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flocculator
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(as
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long
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as
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it
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was
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at
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least
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24
...
L/min).
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In
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order
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to
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ensure
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this
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the
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head
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loss
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out
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of
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the
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plant
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leveling
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tank
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(which
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controls
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flow
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in
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the
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sedimentation
...
tank)
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had
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to
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be
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significantly
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greater
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than
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the
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head
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loss
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over
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the
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alternative
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exit
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in
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the
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flocculator.
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We
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chose
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a
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factor
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of
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safety
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of
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18,
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thus
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the
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head
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loss
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out
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of
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the
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plant
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leveling
...
tank
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would
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be
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18
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times
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the
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head
...
loss
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out
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of
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the
...
flocculator.
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the
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depth
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of
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the
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orifice
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hole
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beneath
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the
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water
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surface
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was
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determined
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to
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be
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13.673cm
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(18
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times
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the
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head
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loss
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over
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the
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flocculator
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outlet
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weir).
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Then
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using
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the
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orifice
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equation,
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with
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the
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flow
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set
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at
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24
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L/min,
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this
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head
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was
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used
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to
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determine
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the
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orifice
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size
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(2.223cm
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or
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7/8").
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The
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orifice
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equation
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used
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was
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the
...
same
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as
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used
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for
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the
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flocculator
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outlet
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but
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converted
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to
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a
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circular
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perimeter
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from
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a
...
rectangle.
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