MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

60Among the simplest designs for a bucket-pump is the “inertia handpump” described in VITA’s Village Technology Handbook (1975). It isconstructed primarily of scrap materials such as scrap barrel metal andinner tube rubber,and can be made by any craftsmen with the proper tools,e.g. a tinsmith. It is reported to lift 20-30 gpm with a 13 ft head and60-75 gpm with a 3.3 ft head. Because this design used scrap material,no cost estimate is given.The Peace Corps, working through such agencies as AID, the BattelleMemorial Institute, UNICEF, and CARE, saw the need for a simple, inexpensive,and dependable hand pump. Specifically, they were looking for a pump ’design with the following features (Peace Corps, 1975);low production cost,long life under severe conditions,easy maintenance with simple tools and unskilled labor,suitable for shallow- or deep-well applications,manufacture in developing countries,easily operated by small people, including women and children,andable to discourage pilfering and vandalism.With these objectives, a pump-- shown schematically in Figure 3.12--wasdeveloped which had a strong cast-iron cylinder, stand, and handle. In aneffort to eliminate poor-wearing leather seals, several synthetic materialswere suggested as good substitutes, e.g. nylon, Corfam, Rek-Syn, etc.However, an effort was also made to allow the standard design to beadaptable to locally manufactured parts if imported, commercial materialswere unavailable. Pumps of several different component materials weretested with up to the equivalentof 10 years of hard use and the various