countries Blair pump only can be used at water depths of less or equal 6
PLASTIC PIPE POMP
PXattic Pip? Pump Deacription
The major idea is the use of asooth polyvinyl chloride pipe which is
now available in most countries at lower cost than using a brass
cylinder or a thin brass liner which has been used in the standard pump
(conventional pump) . The use of the PVC pipe will also prevent rapid wear and replacement of the leather cups or buckets.
The unusual feature of this pump is that the pump handle is
supported on a separate post beside the well and the pump stand. Since the pump stand does not bear the load and stress caused by the handle,
it does not have to use strong materials such as cast iron.
PVC pumps are designed to be simple, inexpensive, and easy to
maintain and repair, and make maximum use of local materials and skills. For example, the post can be made of concrete, bricks or wood, and the
handle can be ta&de of wood or bamboo, which can be replaced locally when worn or broken.
Some feathers of these pumps are:
At shallow-well, the pump stand is a length of 3" PVC pipe also acts
as the pump cylinders (Figure III-2A). '
II
- Below-ground component is only the 1.5 PVC suction pipe suspended from the pump stand which to be set firmly in the concrete or brick
platform, the spout needs to be a 2" hole in the side of the PVC pump
stand with a small lip.
- The rods can be imported metal in shallow well or local wood rods.
casing is used, unless a 2.5" or 2" PVC casing may be required to ensure
the pumping of water without much exertion.
- Most of time wooden rods are used.
At deep-well pump in uncased well (Figure II1-2C)
- In this situation the 4" PVC casing only attaches to the rock.
- Four-inch PVC or cast iron pump stand is fixed on the support plate.
- Ifetal or PVC discharge pipe is used.
- Three-inch PVC cylinder contains the lower valve and the piston. If the cylinder is made of metal, it should have a PVC pipe liner to
provide a smooth surface.
- The rod passes down through the discharge pipe.
- Every 20 feet -on the discharge pipe and the pump rod there is a
clamped or threaded joint.
EXPSRIEICE
Plastic pipe pump has been developed in Thailand. It delivers about
15 US gallons per minute. It is suitable for irrigation and domestic purposes and a simplified piston with a rubber bucket is used in Korea, and this should be much less expensive than the standard type one.
ADVANTAGES AND DISADVAHTAGES
It is a very simple configuration pump and all the materials can be
It is easy to maintain. To remove the piston and replace the leather bucket, all the thing needed is to disconnect the rod from the
piston, and the poppet type valve can be fished out using a wire with a
hook at the end.
Most developing countries now have plants to extrude FVC pipe. The seal is usually a leather disc or molded rubber. These are not
expensive in many countries such as India, Pakistan, Korea, Thailand can
be obtained.
To manufacture the PVC pump, quality control is very important, if
the good seal (leather or rubber bucket) is to be obtained. Actually in
some developing countries, it is impossible to maintain the rigid
quality control.
Plastic pimp stands are less sturdy and more subject to wear and breakage than stands of other materials.
Pumping sand in plastic cylinder results in rapid wear, but this
shortcoming can be eliminated by carefully developing the well to
stabilise the aquifer.
Many plastics are sensitive to ultraviolet radiation and should not be constantly exposed to sunlight.
Shallow Well Pump O -
''^¥^'
3" PVC — concrete or brick platformz
Deep Well Pump-Uncosed Hole in Rock
wood or bamboo handle
volve
71
-brick pier
^^^^55^^^^^^
Deep Well Pump
concrete or bricii
plot form
^^^^^m
B
rubber washer between'
poppet valve and seot
?^
A
wood or bomboo handle w^. Q u -concrete, brick or wood post^///^///^///^//^
-3' PVC casing' low water level
-lower valve seat cemented
inside PVC casing near Joint
iQf
.wood handle
4" PVC or cost iron pump stand base plate - Sitetch D
cast iron support plate - Sketch D PVC dischorge pipe — concrete, brick or wood post ^concrete platform ^y^//4m^ 4 PVC cosmg to th* rock ^^///^///^m^ ^^'^//^m^. -^4 open holt in rock low water level
3 PVC cylinder
(SOURCE: Spangler,C.D. 1975 p.6-8)
Bamboo Pump Description
Properly constructed and maintained Bamboo pump, with light use, may last several years. They may be an economic choice in some situations; for example, pumps are used by households. Figure III-3 shows the "DIY"
pump used in Nigeria (Chatiketu) (McJunkin, FE 1977). Another type of
Bamboo pump developed by Mr. Yusuf and used in many families in the area of Tasikmalaya and Cianjur, Indonesia and in West Java for decades,lifted the water up to a depth of 8 m. The raw material used in the pump such as wood, bamboo, fiber, rubber, etc. are found everywhere in the countryside of Java. Since the pump configuration is simple, a skilled draftsman can construct the pump in only 2 days. The drop pipe
and cylinder are made of bamboo, valves of rubber, and the piston is made of leather. In south of China where bamboo is available, pumps are used to deliver water for drinking.
"Hie advantages of this pump are: cheap, easy to construct, it can
be repaired by villagers and.made locally. Disadvantage: it is not durable.