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Hand pumps are manually operated pumps; they use human power and mechanical advantage to move fluids or air from one place to another. They are widely used in every country in the world for a variety of industrial, marine, irrigation and leisure activities.
A typical Mark II hand pump in India. The pump was designed in the 1970s in a joint effort between the Government of India, UNICEF, and The World Health Organization (WHO) to address the severe drought and a water shortage affecting India during that period and to prevent evacuation of villages to refugee camps.
The pumping of water is a basic and practical technique, far more practical than scooping it up with one's hands or lifting it in a hand-held bucket. This is true whether the water is drawn from a fresh source , moved to a needed location, purified , or used for irrigation , washing, or sewage treatment , or for evacuating water from an ...
PVC will work in some installations, but steel pipe is preferred, although much more expensive. If valves are used they should be a free flow type such as a ball valve or gate valve . The delivery pipe is much less critical since the pressure vessel prevents water hammer effects from traveling up it.
As other positive displacement pumps the Bush Pump is constructed around a down-hole cylinder containing a piston, that lifts water with every lever stroke. [6] The pump's signifying feature is the hardwood block that acts as a bearing and its lever mechanism.
The handy billy, formally designated "P50", because it pumped 50 gallons per minute, was gasoline-powered and could be used, during flooding conditions, in conjunction with other pumps on the ship. However, it was especially valuable when the ship lost electrical power and normal pumping ability was lost.
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