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\begin_body

\begin_layout Title
Sedimentation Tank Design Details 
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\begin_layout Author
by Paroma Chakravarty and Tiange Guo
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\begin_layout Date
Fall 2013
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\begin_layout Part*
Problem Definition
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\begin_layout Section*
Introduction
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\begin_layout Standard
This semester, our task is to update the sedimentation tank code.
 These changes include implementing new designs based on recent research
 from the Summer 2012 Team and ridding the tank of unneeded pieces.
 The first priority we focused on was implementing the new asymmetric inlet
 jet design for the sedimentation tank.
 Based on the experiments and findings of the Summer 2012 Sedimentation
 Tank Hydraulics team, we knew that compared to a centered jet which would
 have water hit the bottom of the jet reverser at a perpendicular angle,
 a vertically placed asymmetric jet is ideal for floc resuspension because
 it eliminates the possibility of sludge buildup in the reverser due to
 preferential flow paths taken by the jet.
 Therefore, the task required us to shift the inlet jet off center (Figure
 
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LatexCommand ref
reference "fig:Centered-Jet-and"

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).
 Consequently, we need to calculate the shifting distance, update the design
 code and implement the new designs.
 We are also focusing on adding 
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feet
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, or supports, to the manifolds (Figure 
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reference "fig:Manifold-Feet-created"

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).
 This includes calculating the size of the feet and their placement based
 on specifications from past fabrication teams.
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\begin_inset Graphics
	filename centered jet.png
	scale 30

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\begin_inset Graphics
	filename vertical asymmetrical jet.png
	scale 30

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\begin_layout Plain Layout
\begin_inset Caption

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Centered Jet and Asymmetrical Jet 
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name "fig:Centered-Jet-and"

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\begin_layout Plain Layout
\begin_inset Caption

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Manifold Feet created by a AguaClara Fabrication Team 
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name "fig:Manifold-Feet-created"

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\begin_layout Section*
Design Details
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\begin_layout Standard
Using May's updated Sedimentation Tank code, we needed to shift the inlet
 jet from the center to an unspecified distance to the right when viewing
 the drawing from the right.
 Though we were required to only move the inlet jet, the code was structured
 so that we had to shift the entire manifold to make this change.
 Though the research team did not articulate in their report whether the
 inlet jet needs to touch the tank wall, we set it an arbitrary distance
 away from the wall in the code so that sludge does not build up behind
 the inlet jet.
 Once the shift has been made, feet to support the manifold pipe had to
 be added.
 These feet are comprised of two pipes of different lengths located at two
 places along the manifold pipe.
 The original report assumed the manifold pipe would be centered in the
 bay, so the length of each foot was equal and calculated in the same way.
 The shifted manifold posed a challenge because two new length equations
 had to be derived.
 We used simliar triangles and trigonometry to derive these equations.
 The feet design included hose clamps, so these needed to be added to the
 sedimentation tank drawing code.
 In the design, the hose clamps are meant to fasten the feet to the manifold
 and ensure that they stay in place.
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\begin_layout Part*
Documentated Progress
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\begin_layout Section*
Asymmetrical Inlet Jet Placement
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\begin_layout Standard
Based on May's updated sedimentation tank code, we calculated the radius
 of the jet reverser and added that to the y component of the sedimentation
 manifold pipe origin.
 While this shifted the manifold and inlet jet over, it created a new issue
 of how to draw the floc weir baffle and a semi circle cutout for the manifold
 pipe to fit into the baffle.
 Originally, the code drew the baffle and cutout in one bay, mirrored that
 to the adjacent bay, and then arrayed that for as many sedimentation tanks
 as needed.
 This method was not working for the newly shifted manifold because the
 baffles with the cutouts were no longer symmetrical within a sedimentation
 tank.
 After some trial and error, we decided to first draw the baffle, mirror
 it to the second bay, then draw the semi circle cutout in the first bay
 and array that to the second bay.
 Then, the whole sedimentation tank can be arrayed to the required number.
 After we had successfully moved the inlet jet to contact the edge of the
 jet reverser, we found that we had to leave some space between the outlet
 jet and the wall to avoid sludge build up.
 Therefore we named that distance S.FromSedWall in the code and set it equal
 to 1inch temporarily.
 If a research team finds an optimal distance later on, they can change
 the distance based on their data.
 After initially setting the inlet jet 1 inch away, we found that the jet
 also needed to be shifted up the same distance to further prevent sludge
 build up.
 This required us to shift the manifold origin point in the positive z direction
 by our new distance variable.
 Again, if a research team finds an optimal distance, this shift can be
 changed by just changing the S.FromSedWall variable (Figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Comparison between before and after"

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).
 
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	filename manifold before.png
	scale 50

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\begin_inset Graphics
	filename manifold after.jpg
	scale 42

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\begin_inset Caption

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Before and after comparison of manifold and inlet jet
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name "fig:Comparison between before and after"

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\begin_layout Section*
Manifold Feet
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\begin_layout Standard
Adding feet to support the manifold involved calculating the length of each
 foot and the angle and area of placement.
 According to May's original code, the feet added to the manifold should
 have been symmetrical since the manifold was centered.
 After we shifted the manifold over to the right side,we needed two differently
 sized feet for supports.
 The longer foot is placed to the left of the manifold when the drawing
 is viewed from the right.
 The shorter foot is placed to the right of the manifold from the same view.
 This pair is then arrayed to a place further down the manifold.
 This location is not specified in the research report, so it is currently
 a variable in the design code.The design task assignment included a formula
 to calculate the length of the feet, but this calculation assumed the manifold
 to be centered in the tank.
 Our off-center manifold required us to come up with a new formula for the
 length calculations.
 At first, we thought that by simply adding the distance of the offset manifold
 to the length calculation we could calculate the length of the longer foot,
 but this did not turn out correctly when we drew the manifold and feet
 in AutoCAD.
 After some analysis, we decided to set the feet perpendicular to the wall
 to best support the manifold.
 We set the origin points of the feet with respect to the origin points
 of the manifold pipe.The x- origin points of the feet are set to an arbitrary
 length away from the x-origin of the manifold pipe because the location
 of the feet have not been specified yet.
 In order to derive the y and z origin points of the feet, we used trigonometry.
 Our method can be found in the sketch below (Figure 
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reference "fig:Calculation of the shorter foot origin points"

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).
 A similar method was used to calculate the lengths of the short and long
 feet (Figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Calculation of the shorter foot length"

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).
 At first we thought that the long leg of the big triangle is equal to the
 z-origin of the manifold minus the z-origin of the center point of the
 jet reverser, but this was incorrect.
 After some analysis, we found that the long leg should be equal to the
 inner radius of the manifold plus the length of the diffuser plus the h.addition
al distance that we calculated.
 Since the AN.SedSlope is given, the length of H.additional was calculated
 by using the sum of the width of the diffuser outlet, the thickness of
 inlet jet and S.FromSedWall.
 Though this makes mathematical sense, the length would only fit if we multiplie
d elements of H.additional in odd ways (Figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Calculation of the shorter foot length"

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).
 It still needs to be ascertained how and why these calculations work.
 After we calculated the length of the long leg of the big triangle, we
 calculated the length of the short leg by using AN.SedSlope.
 Then we calculated the distance from the manifold center to the wall using
 the same angle and calculated the foot length by subtracting the outer
 radius of the manifold.
 While this method makes mathematical sense, there were again issues in
 the length and placement of the long foot.
 We manipulated our code in order to make the feet fit and checked the accuracy
 of these calculations at different plant flow rates.
 The lengths seem to be accurate at all flow rates, but we are unsure as
 to why.
 Lastly, we added hose clamps to hold the feet securely to the manifold
 pipe.
 All specifications for the hose clamps were based on the feet locations
 and width of the manifold pipe.
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Calculation of origin points for manifold feet
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name "fig:Calculation of the shorter foot origin points"

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	filename theoretical calculation of pipe length.jpg
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 Theoretical versus real calculations of feet length
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name "fig:Calculation of the shorter foot length"

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\begin_layout Part*
Future Work
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Future teams should focus on finding definite values for the arbitrary distances
 we have set.
 The code should also be analyzed to identify why the methods we used to
 make the feet fit worked.
 Besides, future teams can just mirror the feet about the point that is
 half the length of manifold instead of making the arraying distance a variable.
 Lastly, May should be contacted to see if there are other details that
 need to be updated in the sedimentation tank code.
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