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Why
The RopePump, as designed by Demotech and constructed for the first time in Burkina Faso as far back as 1976 needs to be reviewed. Basic engineering needs to be replaced by smarter design details. Considerable improvements should be achieved by halving the cost for materials and time for construction, by doubling the speed of the pump rope to result in a sharp increase of efficiency and by improving the ease of maintenance, specially in regard of the guidance of the rope.
This improved RopePump should be promoted with clear manuals and video's where users discuss performance and construction.
How
The design for the RopePump aims at the use of PVC or PE pipe of about 25 mm external diameter for applications, lifting water from 10 to 50 meters. The drive wheel will use rubber rope grips, but not be made from a full circle car tire. The drive crank will preferably has bearings on both ends of the crank, different from the usual setup. The pump rope will have guidance in the pump pipe for the upward as well as for the downward movement. The disks or knots will fit loosely and without any precision in the pump pipe. No special tools will be needed to assemble or disassemble the RopePump.
A project will be set up for effectively informing future users and development field workers about all relevant details.
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Additional information
This it the front page of the manual for a rope pump from a project in Ceram/Indonesia in 1986. This rope pump is attached to a heavy concrete well cover, that is here discribed,
The return part of the pump rope runs down in the well freely, not in a tube. The bottom inlet block is made of wood. All other parts, the wheel, the cranck and the axle are also made of wood.
More information about this type of rope pump is to be found here.
Construction manuals for the Rope Pump
The Mobile Training Unit
An approach for effective introduction and training in villages.
A solar driven rope pump
An illustrated story about a solar driven rope pump in Senegal.
Overview of rope pump manuals
From Demotech and other publishers,
'Appropriate for Women'.
This illustrated report offers guidelines for including women in development projects, mainly based on our own field experiences with the rope pump.
'Aangepast aan Vrouwen'.
The original publication, written in the Dutch language
'1986, Rope Pumps, a Review of Ten Years Experience'
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Our experience gained in the first 10 years after our first introduction of the rope pump in Burkina Faso in 1986.
1986, Touwpompen, een verslag van tien jaar ervaring
Same, but in the Dutch language.
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Planned progress
Test findings from practical application in the Gambia regarding guiding the rope. Publish pictures derived from the video footage.
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Internal links
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More on the Why and the How of the Demotech RopePump
Conditions are listed that are answered by this design. It is of interest to compare these demands with what has acutually been realized in practice. For this read the other papers on the Demotech RopePump and surf to a list of websites that focus on locally produces RopePumps, done so without direct contact with Demotech.
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1986, Rope pumps, a review of ten years experience
Demotech published on the history of her design for the rope pump on behalf of Agromisa, a peridical on Appropriate Technology.
In 1886 we worked in a project, first on Bandung/Java, then on the island of Ceram. The journey to Ceram was on constructing wells. Our visit to Bandung was to see what had come of out introduction of the rope pump in Indonesia in 1979.
Demotech's team member Valentina Julien traveled over East Java and asked around if people knew about the "Pompa Tali". She found in small villages a hundred rope pumps, made pictures and notes on its performance, retraced when and why its was build on who's inititative.
Of her findings we made a report, facinating, because of the very many different ways in which the introduction of the rope pump worked out.
This well documented report on an autonomous spread of a new technlogy in a short period deserves it to be published. Some day we hope to find time for it. However the conclusions and a summary of this report are part of the following paper.
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The Mobile Training Unit
The project cooperation in Ghana in the year 1984, with a team from The National Secreteriat resulted in a method to effectively approach villages. We at that time had to find out if the people of a village that we offerded support for making a well or a water pump were ready to accept our conditions. We offered demonstration, expertise and guidance only, no materials, no labor, no finance.
The elders of a village found this in general unusual, different from the expected approach, where a NGO offered substantial financial support in projects related to water.
So in most cases, they wanted to wait a little more. However, we could reley on the exeption of that one village, who wanted to grab the opportunity right away. In such a village we made a start, trusting that teh people participating would become the local experts, helping the surrounding villages when demands came in for more wells or pumps.
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External Links
Rope pumps, other hand pumps and their application
Links related to waterlifting
- On drilling bore holes, by Chaungo Barasa, working for CARE International UK
The only dependable water sources in Garissa are boreholes drilled to an average depth of about 150 metres. At that depth, quality is often assured, so water treatment is not a crucial. A good borehole can yield 20,000 litres an hour, a moderate one 8,000 to10,000 litres an hour. This can serve over 10,000 people and about 6,000 cows. A well developed borehole can last 12 to 15 years, after which it should be rehabilitated to last another eight to 10 years. The cost of an operational borehole is around $50,000.
http://www.globalpolicy.org/ngos/aid/2002/1021relief.htm
- Rope pump for transporting dry granulate
The idea behind the rope pump used for an entirely different purpose. Disks mounted on a steel cable run fast through a pipe, creating an airflow that transport the granulate, not the disks themselves!
http://www.prosysta.nl/
- Guidelines for drinking water quality
Drinking-water quality is an issue of concern for human health in developing and developed countries world-wide. The risks arise from infectious agents, toxic chemicals and radiological hazards. Experience highlights the value of preventive management approaches spanning from water resource to consumer.
http://www.who.int/water_sanitation_health/dwq/guidelines/en/
- Send us an email form about any relevant link, that should be added here
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What other people say... |
If you like you can add your own comment
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by amintafall - Fri Nov 01 (2002)
ropepump
thank you very much reinder for digging the information out of your
archives. we are again inspired to keep on constructing this excellent
invention of yours and will give you feedback any time between now and
november- by the time i hope to have started the well and pumpproject for
medina thioub senegal. we are open to receive participants in the vilaage,
in senegal at prox. 45 km from the capital. later....
by Henk Holtslag - Tue Dec 09 (2003)
New websites Ropepumps
Dear Reinder
This is to inform your invention worked. Different approaches and versions
but Rope pumps are spreading out to many countries even in Africa. I
estimate there are around 80.000 by now but maybe more used on both
communal and family wells.
The shift from imported piston pumps to locally produced Ropepumps
increased the rural water supply in Nicaragau 23 % in ten years!!!, 3
times fast than countries that did not shift to ropepumps.
I would suggest that you mention on your website the new websites on
ropepumps such as www.ropepumps.org and www.ropepump.com
Succes with your activities
Henk Holtslag
www.practicafoundation.nl
by Henk Holtslag - Tue Dec 09 (2003)
Rope pumps Senegal
I just see on your site that there is someone in Senegal working on
ropepumps. Can he send me more information?
There are several activities in Senegal on Ropepumps, one is by the
organisation Enterprise Works that now train in production of ropepumps
after a hands on training by Practica foundation last year
Henk Holtslag
by Aminta Fall - Tue Dec 09 (2003)
Rope Pumps, MORE rope pumps!!!
Yes Henk it is a pleasure to see yout interest coming back to Senegal, and
here I am still struggling with the one and only real working rope pump,
see also, demotech.org.presentation.php?p=6.
I am waiting for technicians and enthousiastic engineers to come an build
more rope pumps and to adjust to deeper wells.
Mine is still heavy to rotate and I am looking for abnother ?' or &
volt motor to drive the pump, the solar panels I have being able to
deliver the power....
Desperate now also I am thinking of a small diesel engine to rotate the
wheel.
The Stichting NDONGO invites any capable guy or girl to come and stay with
us in tha field of experiments and work on solutions. Local conditions,
local food. I will shortly publish an official report and invitation on
these subjects. we are now preparing seeds for new trees, for the future
world our children will inherit.
Hartelijke groeten, van Hanna Hemmink. Aan allen.
by Reinder / Demotech - Tue Dec 09 (2003)
Re: Rope Pumps, MORE rope pumps!!!
> I am waiting for technicians and enthousiastic engineers to come an
build
> more rope pumps and to adjust to deeper wells ...
Hanna, have a look at
www.demotech.org/presentation.php?p=10
This rope pump I assisted in building in Ghana as far back as 1984 was
easy to cranck, giving plenty water. Yet the borehole was 50 metere deep!
Similar experience in Indonesia in 1980, also at other locations. Do
not go for a (electric) motor drive too soon, as only the local rich people
can afford it. Better check technical details as low or zero pre-tension on
the rope and above all the right choise of the internal diameter of the
pump pipe. Look it up at:
www.demotech.org/design/designB.php?sub=45
I wish I could come to your place to assist you. It may be only one hour
work!
Best of luck, Reinder
> Mine is still heavy to rotate and I am looking for abnother ?' or &?
> volt motor to drive the pump, the solar panels I have being able to
> deliver the power....
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What name would YOU give to this device?
You can assist search machines to find this topic by sending Demotech an email form with one or more appropriate names for this device in your language. Such as: touwpomp, pompe a corde, schijfjespomp, knopenpomp, kettingpomp, sponzenpomp, rope pump, ....
Relevant words in Portugese :Bomba de corda, bomba simples, tecnologia apropriada, bombear agua sem energia, bomba de arruela, bomba de havaiana, (language-Kikuyu,Kenyan) bobo ya mukanda , ....
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