Piston diameter is determined by the type of pipe to be used and the
well's depth. Pistons should be made of injected polypropylene or polyethylene.
Neither rubber nor wood are recommended.
Five different piston sizes are used.
The rope's lenght, diameter and amount of pistons are determined by the well's depth.
Length and diameter variations for both the pistons and the rope
Depth (meters)
Component part (Unit)
0 - 11
11 - 19
19 - 29
29 - 40
Piston nominal diameter (inches)
1
3/4
1/2
1/2
Rope length (Meters)
27
43
63
85
Rope diameter (inches)
1/8
1/8
1/8
1/4
Amount of pistons (unit)
26
42
62
84
Two-inch (0 - 3.5 meters) and 1 ½" inch (3.5 - 5 meters) pistons are used in
wells which are not too deep or when motor pumps are used.
Deep wells (37 - 50 meters) use ½" inch pistons with Rim # 16, a double crank
system, and wooden bearings. These pumps are installed as on drilled wells in order
to increase the contact between the pulley wheel and the rope.
