Post on 19-Mar-2020
Dispensers for Safe Water
Engineering Design Example
Origins
Components Fundi made metal stand Rotational molded tank Valve (MIT) Cement - local
125$ cost
Problems Metal durability Cost LDPE Scale
3 liter HDPE blow-molded tank
~30$ --> 2$
~1,000 per day
10,000$ investment in molds
Design: AMM, Kenya
Fit metal and plastic
Installation: BlowPlast, Kenya
October 2010
First step: New tank!
ap
pro
x. 3
0cm
Adapted Designs
Decision to need “nice” Design
Research highlights – Relationship between design and uptake
Investigated 3 firms – Selected PATH/MS firm in Seattle
– Contracted
Provided information on Dispenser and use
Provided design specifications
First Designs - Industrial to Local
Prototype
Molds in China
Final product (almost!)
10.37$ - Kenya
14.00$ - China
Version 1
Next step: Improvements
Field testing – Strengthening due to deformation
Improved lock for perception of security – Attachment kit (lock, bolts etc)
– From China
Commercialization
Next step: NaDCC
Potential Advantages Potential Disadvantages
5 year shelf life (longer time in Dispenser) Less visits and community touches
Smaller volume per dose Not registered in many countries (can’t
piggyback off PSI’s registrations)
Less smell in dosing (“whiff”) Importation of a “chemical”
Cheaper (unknown how much) Dosing more complicated
Less refills needed Unknown CT factors (PATH research less
effective on viruses – unproven d iarrhea)
NaDCC Prototype
daniele.lantagne@tufts.edu
The Design Process is Ongoing