RP-01638

2.60
/
li
li
3.22
A
B
Fig. 1. Design of original (A) piston and (B) foot-valve adaptor tested in the Asian handpump network (ail dimensions in inches;
1 inch = 25.4 mm): (1) 7/16-inch (1.11-cm) diameter boit, 5.5 inches (13.97 cm) long; (2) 0.5-inch (1.27-cm) holes al 1.53-
inch (3.89-cm) pitch diameter.
dure for the four projects. Two important
instruments required for the field-monitoring
program were subsequently developed to
measure the average water delivered per day
over the monitored period (a totalizing
counter) and the work input of the pump
(a mechanical plotter). These two instruments
are described in detail by Goh (1980).
The detailed field monitoring procedure, as
proposed in the mid-project meeting, was
carried out only in Sri Lanka and Malaysia. By
the time the instrumentation required for the
field monitoring was developed, the Thailand
program had corne to an end and the project
in the Philippines encountered problems in
the foot valve and the well.
The handpumps in Sri Lanka and Malaysia
were in the field for more than 2 years. However,
because of the delay in the development
of the field monitoring instrumentation, the
field monitoring program was carried out
only for the last 13 months in Sri Lanka and
the last 8.5 months in Malaysia. The resuits
of these monitoring studies are reported in
the country papers.
The volumetric efficiency of the hand-
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