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Bush pump

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[[Image:lever action icon.png|right|80px]]

[[Image:bush pump.jpg|thumb|right|200px|The Bush pump used a lot in Zimbabwe. Photo: [http://www.rural-water-supply.net/en/implementation/handpump-overview/bush-pump RWSN.]]]

 

The Bush Pump is a robust conventional lever action handpump, developed and standardised in Zimbabwe (SAZ 881:2004). It is designed for heavy-duty use, serving communities of 300 persons.

The typical feature of this pump is the “Hardwood block” that acts as both, bearing and lever mechanism. The pump is designed that the stand can be directly bolted to the protruding 6” steel casing of the borehole, Ø150 mm NB (Nominal Bore).Three different cylinders are available, the smallest one extend the range to a maximum recommended lift of 80 m. The Bush Pump is not corrosion resistant. It requires special skills for installation as well as for the maintenance; it is not a VLOM pump.

===Suitable conditions===[[Image:bush pump2.jpg|thumb|right|200px|The Bush pump can be locally manufactured. Photo: [http://www.rural-water-supply.net/en/implementation/handpump-overview/bush-pump RWSN.]]]

Distribution: More than 30,000 in Zimbabwe.

===Construction, operations and maintenance ===

Pump stand is made of mild steel painted, handle & riser pipes of galvanized GI pipe, pump rods are of galvanized steel, cylinder of brass, bearing block of hardwood, plunger and foot valve of bronze or brass. This pump is not corrosion resistant and should not be used in areas with aggressive water (pH < 6.5).

The pump with the standard configuration has a limited “Community Management Potential”, but it is very reliable and popular with the community. Besides the “Standard” configuration, there exists an “Open Top Cylinder” version (easier to maintain) with different cylinder sizes (Ø50 mm, Ø63.5 mm and Ø75 mm). To make maintenance easy, pump rods with case-hardened hook & eye connectors, are standard (Ø16 mm).

===Manuals, videos, and links===* ERPF, K. [http://docs.watsan.net/Downloaded_Files/PDF/Erpf-1998-Bushpump.pdf The Bush Pump - the national Standard Handpump of Zimbabwe] or (1998) [http://www.rural-water-supply.net/en/resources/details/216 The Bush Pump - the national Standard Handpump of Zimbabwealternative link]).] A review by SKAT/HTN to find out what had made this pump so popular in Zimbabwe. Skat , RWSN (incl. HTN), St Gallen, Switzerland.1998. * MORGAN, P. (2011) [http://www.rural-water-supply.net/en/resources/details/385 The Zimbabwe Bush Pump (B Type). Installation Manual with notes on maintenance], Aquamor Pvt Ltd., Harare, Zimbabwe.2011. * MORGAN, P. (2012) [http://www.rural-water-supply.net/en/resources/details/386 Making a strong “head-works” for the Zimbabwe Bush Pump. (for boreholes)], Aquamor Pvt Ltd, Harare, Zimbabwe.2012. * RWSN/DWRD (2004) [http://www.rural-water-supply.net/en/resources/details/323 Bush Pump. Zimbabwe Standard Specification], Department of Water Resources and Development , The Zimbabwe Government, Harare, Zimbabwe. 2004.

===Acknowledgements===

* [http://www.rural-water-supply.net/en/implementation/handpump-overview/bush-pump Implementation • Handpump Technology Bush Pump]. RWSN.

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