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| − | [[Image:Rope/elephant_pump_icon.png|right]] | + | * See [[Rope pump]] |
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| − | For wells down to 35 m, rope pumps are often 5 times cheaper and more Rotating movement (constant force 5-10 Kg.m) sustainable than piston pumps. Evaluations show that rope pumps on communal wells are being maintained by the users, if introduced properly. 90% Of rope pumps remain operational, even after many years. Continous water flow Because of its low cost, the pump is also popular for domestic use. (1-2 m/s) A survey among 5,025 rural families in Nicaragua indicates that a Schematic PVC pump tubes drawing of a rope pump increases income, even if used for domestic purposes (5-10 Kg) rope pump only. Families with a pump earn US$ 220 per year more than Low pressure in all parts families without a pump. In Nicaragua the pumps are now being (0, Kg/cm) produced commercially by 20 workshops. Few, non-corroDifferent models of Rope pumps were introduced in Africa.This sive pump parts introduction has not always been successful: in some projects over 80% of the pumps do NOT work! However, with the "right" models and the "right" user training, also 90 % remain in operation in Africa, as the Victory model in Ghana and the Elephant model in Zimbabwe have proved.
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| − | (PE pistons, rope, concrete guide block)
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| − | [[Image:Rope/Elephant_pump.PNG|thumb|right|150px|[[Rope/Elephant pump |Rope/Elephant pump ]], in Epworth (for credits, click the picture)]]
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| − | {| border="1" cellpadding="5" cellspacing="0" align="center"
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| − | ! width="50%" style="background:#efefef;" | Advantages
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| − | ! style="background:#ffdead;" | Disadvantages
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| − | | valign="top" | The design reduces the need to handle fresh faecal material. <br>
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| − | Shallow depth of pit required.
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| − | | valign="top" | No full recovery of nutrients. <br>
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| − | Space required. <br>
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| − | Cleaning of the toilet must be done with small amounts of water.
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| − | |}
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| − | == Capacity ==
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| − | *Small / medium sized family - Capacity: about 0.5-0.75 m³ - Filling time: 6-12 months
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| − | *Family with 10 users - Capacity: about 1 m³ - Filling time: 6 months
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| − | == Costs ==
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| − | * Construction of total system, including material and labour - About US$ 20 - 30 (Mozambique).
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| − | == Applying conditions ==
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| − | <ul>
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| − | <li><b>Numbers:</b> 50,000 in Nicaragua, 20,000 in Mexico, Honduras, Guatemala, Ghana, Zimbabwe, Tanaznia, Senegal.</li>
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| − | <li><b>Yield:</b> 40 litres/min from 10 m depth.</li>
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| − | <li><b>Range of depth:</b> 1-35 meter (60 m with two cranks).</li>
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| − | <li><b>Application</b> Communal wells, houshold, irrigation. </li>
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| − | <li><b>Initial cost:</b> US$ 20-120 depending on model.</li>
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| − | <li><b>Cost of introduction:</b> US$ 10,000-20,000 per project, including 20 pumps, engineering and hands-on training. US$ 60,000-100,000 per project, including 1,000 pumps, production workshop and hands-on training.</li>
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| − | </ul>
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| − | == External links ==
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| − | * Evaluations [http://www.irc.nl www.irc.nl ]
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| − | * Africa [http://www.pumpaid.org www.pumpaid.org ]
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| − | * General info [www.ropepump.com www.ropepump.com][www.ropepumps.org www.ropepumps.org]
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