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\begin_body

\begin_layout Title
Water Pump
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\begin_layout Abstract
The water pump team is investigating manual water pumping systems that can
 be used by the AguaClara plant operator to lift water two to three meters
 from the settled water channel (or the filter outlet box) to the chemical
 stock tanks.
 Preliminary research suggests that foot or hand operated piston and diaphragm
 pumps are the most promising.
 In making this decision, construct-ability, simplicity of repair, access
 to materials in resource-poor communities, and possible failure modes are
 considered.
 At this point we have calculated both the discharge rate head loss of several
 pump designs using Mathcad.
 With the current design specifications we have come to the conclusion that
 a diaphragm pump is the most ideal pumping system available for the specified
 job.
 
\end_layout

\begin_layout Labeling
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students 3 PT
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\begin_layout Labeling
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skills fabrication, some fluid mechanics
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\begin_layout Section
Introduction
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\begin_layout Standard
The goal of this team is to design, fabricate, and test a pump that can
 deliver about 1 L/s using human power.
 The pump fabricated during the spring semester can serve as a prototype.
 Preliminary investigation during the spring of 2011 revealed that piston
 pumps are challenging to build because of the requirement of a sliding
 seal between the piston and the cylinder.
 A diaphragm pump that uses a flexible membrane doesn't have any sliding
 seals and is thus easier to build.
 The challenge is to see if we can design and fabricate a diaphragm pump
 that is reliable, efficient, and easy to construct.
\end_layout

\begin_layout Enumerate
Find a more ideal membrane material.
 The flat sheets of santoprene don't work well because of the poor geometry.
 We need a method to fabricate cylindrical membranes.
 One possibility is to use a toilet plunger.
 They have a reasonable shaped flexible membrane.
 The material needs to be able to meet the following qualifications: 
\end_layout

\begin_deeper
\begin_layout Enumerate
The material needs to be robust enough to withstand constant use without
 fracturing or leaking.
 
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\begin_layout Enumerate
The material needs to be able to be able to withstand several meters of
 head without deforming or ripping.
 
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\begin_layout Enumerate
The material should be cylindrically shaped such that there can be a decent
 stroke length without there being any wrinkling of the membrane when attaching
 the membrane to the outside of the pump casing.
 
\end_layout

\end_deeper
\begin_layout Enumerate
There are several options for driving the plunger attached to the membrane.
 The membrane system can be fit to a 
\end_layout

\begin_deeper
\begin_layout Enumerate
treadle pump where the operator stands on two levers that are connected
 to two plungers
\end_layout

\begin_layout Enumerate
direct acting diaphragm pump where the operator pushes and pulls the plunger
 rod
\end_layout

\begin_layout Enumerate
lever diaphragm pump where the operator moves a lever by hand that is connected
 to the plunger 
\end_layout

\end_deeper
\begin_layout Enumerate
Look at the AguaClara plant layout and come to a conclusion on the pump's
 positioning and how it will be implemented in the plant overall.
 
\end_layout

\begin_layout Standard
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\begin_layout Plain Layout
\begin_inset Graphics
	filename Diaphragm Pump.png
	width 10cm

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\begin_inset Caption

\begin_layout Plain Layout
Diagram of plunger-based diaphragm pump
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