#LyX 2.0 created this file. For more info see http://www.lyx.org/
\lyxformat 413
\begin_document
\begin_header
\textclass article
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman default
\font_sans default
\font_typewriter default
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100

\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\float_placement H
\paperfontsize default
\spacing single
\use_hyperref false
\papersize default
\use_geometry false
\use_amsmath 1
\use_esint 1
\use_mhchem 1
\use_mathdots 1
\cite_engine basic
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Title
Sedimentation Tank Design Details 
\end_layout

\begin_layout Author
by Paroma Chakravarty and Tiange Guo
\end_layout

\begin_layout Date
Spring 2014
\end_layout

\begin_layout Part*
Problem Definition
\end_layout

\begin_layout Section*
Introduction
\end_layout

\begin_layout Standard
This semester, our task is to update the sedimentation tank code.
 Our first priority will be taking parts of May's sedimentation tank code
 (see figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:May's Code"

\end_inset

) and merging them with the current sedimentation tank code (see figure
 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Current Code"

\end_inset

).
 Some examples of these changes are ensuring the inlet pipes are entering
 the tank at a ninety degree angle, making sure that the elbow and vertical
 pipe are buryed in concrete, and then ensuring that these changes do not
 effect the floc hopper.
 Additionally, some recent updates from Honduras need to be coded into the
 design.
 Details such as adding more feet (see figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Manifold-Feet"

\end_inset

) to the inlet manifold pipe, making the floc weir out of concrete, deleting
 the inlet manifold support platform, and burying the emergency drainage
 pipes in concrete need to be added to the merged code.
\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename MaySed.jpg
	scale 40

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
The Drawing of May's code
\begin_inset CommandInset label
LatexCommand label
name "fig:May's Code"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename CurrentSed.jpg
	scale 40

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
The drawing of the current code
\begin_inset CommandInset label
LatexCommand label
name "fig:Current Code"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename feet.jpg
	scale 50

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
Manifold Feet created by a AguaClara Fabrication Team
\begin_inset CommandInset label
LatexCommand label
name "fig:Manifold-Feet"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Section*
Design Details
\end_layout

\begin_layout Standard
Last semester our subteam focused on using May's sedimentation tank code
 to make updates such as creating feet to support the inlet manifold and
 shifting the inlet jet; this semester we focused on identifying the differences
 between May's and the current sed tank code and merging them to create
 a new code.
 An initial survey of May's code showed that there were some parts of her
 work that were more favorable for merging; specifically, we left the inlet
 and exit channels in their original form found in the current sed tank
 code, but altered the inlet manifold pipe to May's design.
 Merging those two codes needed more reference checking because simply copying
 the different parts from May's code to the current code was not feasible
 due to the different dimensions used in the design files.
 The challenge was in identifying which dimensions were different and why.
 One difference we found was in the length calculations of the pipes in
 the sed tanks.
 The dimensions in May's code tended to be shorter than the current code,
 so we had to standardize which dimensions to use.
 Because the current sed tanks dimensions had been used for a while and
 there have been no requested design changes with that specific part, we
 decided to use the dimensions from the current sed tank design file.
 After we merged the codes, we returned to the design challenges to code
 in updates made to the sed tank.
\end_layout

\begin_layout Part*
Documented Progress
\end_layout

\begin_layout Subsection*
Inlet Pipe and Diffuser Length
\end_layout

\begin_layout Standard
To ensure the inlet pipes were entering the sedimentation tank at 90 degrees,
 we eliminated the 45 degrees inlet pipes and two elbows in the current
 sed tank code.
 This created the issue of an incorrect length calculation of the inlet
 manifold.
 Going back to the current sed tank design file, we found that the length
 calculation was correct intially in the file, so our task centered around
 identifying where later in the design file or code the length was redefined.
 We found the issue in the area where the inlet pipe used to follow the
 concrete slope of the tank.
 The length of the entire pipe had been recalculated to account for the
 sloping part of the inlet pipe, so eliminating this calculation allowed
 for a correct length calculation.
 Once the horizontal part of the inlet pipe was coded, we noticed that we
 needed to code in a 90 degree angled elbow and a vertical inlet pipe.
 May's code also calculated the length of the diffusers in a different way
 than the current sed tank reference file; Monroe editted the current reference
 file later in the semester, so his method was used in the merged reference
 file.
 These additions were easily added from May's code with dimension calculations
 from the current design file.
 With the addition of a smaller coupling than currently found in the sed
 tank, our inlet manifold was finished.
\end_layout

\begin_layout Subsection*
Support Feet
\end_layout

\begin_layout Standard
As with last semester, the feet do not quite fit flush against the slopes
 of the sedimentation tank.
 We worked with Julia on determining alternate methods of calculating geometrica
lly feet lengths, but the new methods did not seem to function better than
 what was already written.
 After working with the code for a few days, we determined that the current
 calculations were sufficient and that the exact feet lengths would have
 to be determined during construction (Figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:The-current-feet-1"

\end_inset

).
 Since the manifold pipe is quite rigid, there was no need to array more
 feet and putting them only at both ends was sufficient.
 Specifically, the other pair of feet should be put on the right side of
 the floc weir since buring the left side part of the manifold under the
 concrete will make it pretty stable.
 Once the feet were in place, a support platform that kept the manifold
 upright was no longer needed, so we simply deleted it under the 
\begin_inset Quotes eld
\end_inset

Sedimentation Tank Concrete
\begin_inset Quotes erd
\end_inset

 section.
\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename currentfeet.jpg
	scale 50

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
The current feet
\begin_inset CommandInset label
LatexCommand label
name "fig:The-current-feet-1"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Subsection*
Sedimentation Exit Launder, Skimmer Pipe, Exit, and Inlet Channel Fittings
\end_layout

\begin_layout Standard
After correcting the inlet manifold, the coupling for the launder was in
 the middle of the exit channel and should have connected to the sedimentation
 launder and be flush with the inner side of the wall.
 The fitting for the inlet and exit channels and the length of the skimmer
 pipe were also off.
 Fixing these issues was a matter of determining where in the code each
 piece was drawn and ensuring the correct dimension was being used.
 Using the dimensions and drawing methods from the current sed tank design
 file, the issues were corrected.
 This, with the feet and inlet pipe, created the new design ( figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:The-updated-current-1-1"

\end_inset

).
\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename OurTank.jpg
	scale 25

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
The updated current sedimentation tank
\begin_inset CommandInset label
LatexCommand label
name "fig:The-updated-current-1-1"

\end_inset

 
\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Subsection*
Burying the Emergency Drainage Pipe
\end_layout

\begin_layout Standard
Our visit to Honduras showed us that the emergency drainage pipe was drawn
 too close to the wall and that during construction it was difficult to
 plaster around it.
 It was decided that the easiest solution to this issue would be to bury
 the pipe in concrete and eliminate the need to reach behind it.
 In order to do that, we coded a box around it under the 
\begin_inset Quotes eld
\end_inset

Sedimentation Tank Concrete
\begin_inset Quotes erd
\end_inset

 section.
 The box is unioned with existing tank concrete.
 For the x-origin of two vertexes of the box, the higher vertex was set
 to be plant origin minus sed tank length and the lower vertex was set to
 be plant origin minus sed tank length plus inlet channel width and wall
 thickness because the box was supposed to have the same width as that of
 the inlet channel and it should also be against the side tank wall.
 Similar placement methods were used to place the y and z origins of the
 box (Figure 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Bury-the-drainage-pipe-1"

\end_inset

,
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:x-ray-view-1"

\end_inset

).
\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename BuryDrainagePipe-Top View.jpg
	scale 50

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
top-view of the drainage pipe box
\begin_inset CommandInset label
LatexCommand label
name "fig:Bury-the-drainage-pipe-1"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename BuryDrainagePipe-x-ray.jpg
	scale 40

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
x-ray view of the drainage pipe box within the sed tank
\begin_inset CommandInset label
LatexCommand label
name "fig:x-ray-view-1"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Subsection*
Positions of the Manifold Vertical Pipe and the Launder
\end_layout

\begin_layout Standard
Since we shifted the inlet manifold over using our new space variable, the
 positions of the manifold vertical pipe and the launder were a little off
 compared to the manifold from the side view in the AutoCAD drawing.
 In order to fix positions of the manifold vertical pipe and its fittings,
 we changed the y-origins to the same as that of the manifold pipe.
 The launder should be in the middle of the bay, so we summed up y-origins
 of two vertexes of the support platform concrete box and divided by 2,
 which was be the y-origin of the launder and its couplings.
\end_layout

\begin_layout Subsection*
Floc Weir Concrete
\end_layout

\begin_layout Standard
To make a permanently installed floc weir out of concrete, we deleted the
 entire 
\begin_inset Quotes eld
\end_inset

Floc Weir Baffle and Slot
\begin_inset Quotes erd
\end_inset

 section and coded the floc weir concrete under the 
\begin_inset Quotes eld
\end_inset

Sedimentation Tank Concrete
\begin_inset Quotes erd
\end_inset

 section.
 The concrete floc weir is drawn as a box which has the thickness of inlet
 channel wall thickness (5 cm) and the width of a bay plus two times the
 inlet channel wall thickness.
 The box is at the height of the floc weir with its bottom at the same height
 as the manifold pipe.
 This created an issue over whether to include our space variable from last
 semester or not.
 After some observations of the nearby pieces and how they were drawn, we
 decided not to change the height of the box bottom (Figure
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Floc-Weir-Concrete-1"

\end_inset

, 
\begin_inset CommandInset ref
LatexCommand ref
reference "fig:Floc-Weir-Concrete in x-ray"

\end_inset

).

\color black
 A part of this design update included ensuring that a person could fit
 between the floc weir and the bottom of the inlet and exit channels.
 To measure this distance in the code, we took the height of the inlet and
 exit channels minus the thickness of the channels and the height of the
 floc weir.
 This distance was about 38 cm, so it should be enough for an operator to
 fit in between the two concrete sections.
\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename FlocWeirConcrete.jpg
	scale 35

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
Floc Weir Concrete
\begin_inset CommandInset label
LatexCommand label
name "fig:Floc-Weir-Concrete-1"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Standard
\begin_inset Float figure
wide false
sideways false
status open

\begin_layout Plain Layout
\begin_inset Graphics
	filename x-ray concrete floc weir.jpg
	scale 30

\end_inset


\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
centering
\end_layout

\end_inset


\end_layout

\begin_layout Plain Layout
\begin_inset Caption

\begin_layout Plain Layout
Floc Weir Concrete in X-Ray View
\begin_inset CommandInset label
LatexCommand label
name "fig:Floc-Weir-Concrete in x-ray"

\end_inset


\end_layout

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Section*
Future Work
\end_layout

\begin_layout Standard
The sed tank is continually evolving and updating, so future teams should
 focus on implementing these changes in the code.
 The first change should be to taper the inlet channel to prevent flocs
 settling at the end of it where the velocity is low.
 
\end_layout

\end_body
\end_document
