National Agricultural Research Institute
Copies of the leaflet can be obtained from:
Research Programme Leader
National Agriculture Research Institute
Dry Lowlands Programme - Laloki
PO Box 1828
PORT MORESBY
National Capital District
Papua New Guinea
HOW TO MAKE ROPE
AND WASHER PUMP
Telephone: (675) 323 5511
Facsimile: (675) 323 4733
Email: dlplaloki@global.net.pg
NARI TOKTOK
LAL0012E
December 2004
Introduction
THE INSTITUTE
Do you have access to an open water source but need
to lift this water regularly for consumption and suffer from
frequent power cuts and failures?
The National Agricultural Research Institute (NARI)
was established by an Act of National Parliament of Papua
New Guinea in July 1996 as a publicly funded, statutory
research organisation, to conduct applied and development oriented research on food crops, alternative food and
cash crops, livestock and resource management issues.
Besides applied and adaptive research, NARI is responsible for providing authoritative technical, analytical and
diagnostic services and up-to-date information to the entire agriculture sector in PNG. The major targets are the
smallholder semi-commercial farmers in the country.
Then you can solve your water problem by building a simple
pump called the Rope and Washer Pump. This pump is
comprised of a nylon rope, washers, a pipe and a pulley.
The washers are attached to the nylon rope as it is pulled
up through the pipe by rotating the pulley to push up water.
This device can lift water 20m high and costs around K500.
It is most suitable for areas where the water source is either
underground or from ponds and rivers but not from bore
wells. The rope and washer pump is the most economical
and simple form of water lifting service, ideally suited for
rural applications. The pump can be manufactured using
locally available materials with little carpentry skills; hence
costs of acquiring and maintenance would be low.
The pump was developed by Centre for Appropriate Rural Technologies (CART), India and was introduced to
Papua New Guinea by National Agriculture Research Institute in late 2001 under the World Bank Drought and Frost
Response Project.
What is its purposes?
The pump can be effectively used for the following applications:
ƒ
The mission of NARI is to contribute, through applied research and technical services, to the development of the
agriculture sector and realization of the national goals by
identifying, adapting and transferring agricultural technologies and information, so as to:
-
Enhance the productivity, efficiency and
sustainability of the smallholder agriculture, and
Improve farmer income, food security and welfare
of Papua New Guineans and the Nation.
This toktok was written by Paul Osilis,
NARI Dry Lowlands Programme in
December 2004.
Crop irrigation
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ƒ
ƒ
Drinking water
Other applications
Production Procedure:
The pump consists of the following basic parts
1.
Crank Mechanism:
Consist of a pulley, a locking shaft, wooden bearings and a rotating handle.
Crank Mechansim
1.1
Making the Pulley:
Inclined mounting on open river
ƒ
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Cut two rim sides of an old car tyre as
demonstrated above (5cm wide).
2
3.2.
Inclined mounting
•
•
ƒ
Sew the uncut side of the two rim side
together with string.
•
•
•
•
•
1.2.
Making the Pulley hub:
ƒ
Select four timbers measuring 7.5 cm x 5
•
•
ƒ
Build firmly a support frame using wood or timber
on the riverbank.
Mount the crank mechanism onto the support
frames.
The bottom guide is fixed to the PVC riser pipe
and the washer rope is inserted into the pipe and
bottom guide.
Some dead weights are added at the bottom of
the guide to keep it in place.
The whole pipe assembly is taken at an angle and
dropped into the water.
The crank is aligned with the riser pipe and the
wooden bearings are fastened. The shaft is locked
in position; locked pulley and bushes are tightened.
The other end of the washer rope is taken around
the pulley and tied together after overlapping the
two ends.
The crank is placed in such a way that washer
rope moves freely and does not touch the ground.
The pipe needs to be supported along the way at
regular intervals.
cm x 32.5 cm for the hub arms
Select two timber pieces at 2.5 cm x 7.5 cm
x 7.5 cm for shaft locking
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•
Mount the crank mechanism onto the support
frames.
Crank mechanism mounted onto support frame
•
•
•
•
1.3. Making handle and shaft Bearings
ƒ The handle is made by welding a locking bush 2.5 cm
diameter onto a metal flat at one end and a short length
of pipe at the other.
ƒ
The bush contains locking bolts, which lock the shaft.
ƒ
Make two wooden bearings to the size of the shaft and
drill holes between them.
The bottom guide is fixed to the PVC riser pipe
and the washer rope is inserted into the pipe and
bottom guide.
The whole pipe assembly is lowered into the open
well
The crank is aligned with the PVC riser pipe and
the wooden bearings are fastened. The shaft is
locked in position; locked pulley and bushes are
tightened.
The other end of the washer rope is taken around
the pulley and tied together after overlapping the
two ends.
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4
ƒ
ƒ
The wooden bearings are later fixed on the mounting
frame as shown in diagram below.
The crank, PVC riser pipe and the bottom guide opening is placed in the same vertical plane, which ensures
smooth working of the pump.
3. Assemble of Mounting System:
• involve two approaches depending on the source of
water.
3.1.
Mounting on open well
•
Build a firm support frame using wood or timber
above the open well.
Bearings fitted on mounting frame
1.4. Assembly:
ƒ Two hub arms made into a cross and fastened at the
centre
ƒ Two square pieces of shaft locking are placed on opposite sides of the hub arms centre and fastened.
1.5. Assembling of Crank mechanism:
ƒ The shaft is inserted into the central hole of the pulley
assembly
ƒ The wooden bearings are inserted on either sides of
the pulley.
5
Support frame built above the well
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ƒ
The handle and the locking bushes are also fixed
ƒ
The shaft is locked with hub.
Washer rope placed
into the bottom guide
through the PVC pipe
ƒ
The washer rope is then inserted into the PVC riser
pipe through the bottom guide
ƒ
The end of the rope are then overlapped and tied together to form an endless rope. The bottome guide is
sinked to the bottom of the water source.
1.6
Bottom Guide
ƒ
A hole is cut in a log big enough for the washers to
pass through
ƒ
The entrance of the hole expands so that the washer
can pass through without getting stuck
ƒ
A piece of cover strip steel plate is mounted onto the
topside of the hole in the bottom guide for smooth turning of the washer rope.
End of rope tied together
Bottom guide
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2. Water Lifting Mechanism:
ƒ
Spacing between the washers is 60 cm.
Consist of a nylon rope, washers, a PVC riser pipe
and a bottom guide
2.1. Construction of the lifting mechanism:
ƒ The length of the PVC riser pipe is selected according
to the depth from which the water is lifted.
ƒ Washers are cut to the size of the internal diameter of
the riser pipe such that they can easily slide into the
riser pipe.
ƒ Washers can be made from using sheet of old car tyres
5mm thick (or made from readily available nylon
bushes)
ƒ Holes are drilled in the centre of the washers to insert
the nylon rope and knots are tied on either side of the
washer to secure washers in place.
Washers cut from old tyres and holes drilled
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Washer spacing
ƒ
ƒ
ƒ
The length of rope with washer (washer rope) should
be twice the length of the PVC riser pipe.
The PVC riser pipe is fixed firmly to the bottom guide.
Some dead weights are tied to the bottom to hold it in
place.
Riser pipe placed firmly
onto bottom guide
PVC Riser pipe and bottom
guide tied together
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