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Rope pump

1,343 bytes added, 18:20, 26 August 2011

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Similar to piston pumps, a cement slab and a good soak away are needed to avoid splash water becoming a cause for pollution.

===== Motorized rope pumps =Design ====Most common diesel and petrol pumps are suction pumps that can pump from shallow wells down * Pumping depth (Lift): 0 to 30m * Cylinder diameter: 28 mm to 7 m. deep. Pumping from deeper wells requires generator pump sets or long-shaft diesel pumps costing US$ 800 or more. Where there is electricity42 mm, submersible pumps can be used but many small farmers do not have electricity.depending on depth* Piston: Plastic pistons spaced at 1 mMotorised rope pumps can pump from deep wells* Yield: (75 watt input, up to 60mat 5 m head) ~ 4.<ref>[http:5 m³/hour * Population/wwwfield area served: 0.practicafoundation.nl/products/pumps/motorized-rope-pump/ Information on Motorized rope pumps on the website 25 hectare * Type of Practica Foundation]</ref> This model combines a rope pump with an electric motor well: dug well or petrol engine. Pump parts and other elements of the structure can be produced in local workshops, the engines are often imported.borehole

If combined ====Manufacturing and Materials====The rope pump can be produced with a locally available standard materials and local skills. Artisan workshop: small petrol engine the cost scale production of a motorised deep-well pump can be US$ 450. This is far cheaper then long-shaft diesel pumps or submersible pumps and this cost can even be less when Chinese engines are usedhandpumps in small workshops with few tools using locally available materials.

Similar to hand rope pumpsThe frame is welded from mild steel; The handle axle is a mild steel pipe (some design use bearings, either ball bearings or wooden bearings, the pump part can be maintained and repaired other employ a steel bush; The pulley wheel is assembled by fitting the users. cut off sides of a tyre on a rim; The motorised rope pump ropes are made of Polyethylene, Polypropylene, or Polyamide fibres varying from Ø 4 to Ø 8 mm; The pistons are injection moulded plastic with no seal; The rising main are PVC pipes ranging from ND20 to ND50 (depending on lift); The guide box is being tested made of concrete with a ceramic insert (some designs use cast in Columbia and Nicaraguaglass bottles; Screens are not used, only coarse filters.

====Installation====

====Operation====The installation of the Rope pump is easy and does not need any lifting equipment or special tools. The pumps are generally installed in dug wells but also versions that fit into boreholes are available.

====Maintenance====

Maintenance is limited, and consist mainly of repairing the rope or handle. Evaluations show that rope pumps on communal wells can be maintained by the users under certain conditions. One of the main conditions is a very high level of community coherence and responsibility. If the rope pump technology is introduced properly, like often is the case with the Zimbabwe Elephant Rope pump, up to 90% of rope pumps remain operational, even after many years.

====Manufacturing Motorized rope pumps ====Most common diesel and petrol pumps are suction pumps that can pump from shallow wells down to 7 m. deep. Pumping from deeper wells requires generator pump sets or long-shaft diesel pumps costing US$ 800 or more. Where there is electricity, submersible pumps can be used but many small farmers do not have electricity. Motorised rope pumps can pump from deep wells, up to 60m.<ref>[http://www.practicafoundation.nl/products/pumps/motorized-rope-pump/ Information on Motorized rope pumps on the website of Practica Foundation]</ref> This model combines a rope pump with an electric motor or petrol engine. Pump parts and other elements of the structure can be produced in local workshops, the engines are often imported. If combined with a locally available small petrol engine the cost of a motorised deep-well pump can be US$ 450. This is far cheaper then long-shaft diesel pumps or submersible pumps and this cost can even be less when Chinese engines are used. Similar to hand rope pumps, the pump part can be maintained and repaired by the users. The motorised rope pump is being tested in Columbia and Nicaragua.

==Cost==

* Cost of introduction: between US$ 10,000-30,000 per project, including 20 pumps, engineering and hands-on training.

* Rural water programme: US$ 150,000-200,000 per project, including 1,000 pumps, start up of production facility and hands-on training.

 

 

 

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