RP-01638

Fig. 11. Below-ground components of AIT-PVC handpump:
(1) steel rod; (2) coupling; (3) brass guide; (4) PVC
piston valve; (5) PVC piston; (6) PVC piston ring; (7) PVC
pipe; (8) stainless-steel plate; (9) rubber foot-valve plate;
(10) PVC foot valve; (11) solvent cernent glue; and (12) steel
well casing.
joint of the pump rod to minimize vibrations.
Details of the below-ground components are
shown in Fig. 11.
On a trial basis, three AIT-PVC handpumps
were installed in wells located in three
1
2
4
5
9
10
11
12
Table 4. Specifications of the three AIT-PVC
handpumps that were field tested.a
No. 1 No. 2 No. 3
Installation date 22)8180 15111180 19111180
Water level (m) 11.25 9.15 12.00
Volumetric efficiency
(%)
lb
76 78 73
E 98 91 86
Avg piston-ring
thickness (mm)
Upper
6.59 6.71 9.43
E 6.28 6.55 7.21
olo change 4.40 2.38 2.96
Lower
6.53 6.49 7.42
E 6.31 6.40 7.23
olo change 3.37 1.39 2.56
Avg inner diam of
cylinder (mm)
80.01 79.95 79.86
E 80.51 80.30 80.27
% change 0.64 0.43 0.42
'10 mm = 0.39 inch; 1 m = 3.28 feet.
'I, at installation; and E, at end of field test.
Table 5. Cost comparison of above- and belowground
components of three types of handpumps
used in Thailand (December 1980).
Type of
handpump
Cost
(Baht)'
Remarks
Above-ground
DMR 2100 Mass production
ARD 2500 Mass production
AIT-PVC 2300 Single order
Below-groundb
DMR 700 Mass production
ARD 700 Mass production
AIT-PVC 800 Single order
'23 Baht = US$1.
'Excluding riser pipes. For AIT-PVC handpump, the cost
of riser pipe is approximately 110 Bahtlm (33 Bahtlfoot).
different regions and their performance was
monitored. The identification and initial
dimensions of the below-ground components
and the performance of these all-PVC
handpumps are summarized in Table 4.
Cost analysis
The cost of an AIT-PVC handpump was
estimated and compared with the DMR and
ARD handpumps (Table 5). Two separate
components are considered in the cost
analysis, the above- and below-ground com
ponents. For the below-ground components,
31