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Technical Details

Design for low cost and high reliability:-The Poldaw Windpump has a very simple but elegant design. Most successful small windpumps with a deep well capability use a speed reduction gearbox.  However, gearboxes are expensive, difficult to manufacture, and require good lubrication and therefore high maintenance. The Poldaw transmission uses a simple crank and rocker arrangement, with a specially developed rotor which develops high torque at low speed. The elimination of the gearbox reduces the cost and improves reliability.  Furthermore, the direct drive system permits complete counterbalancing of the pump rods weight, which enables the machine to pump more water in light winds when conventional machines stand still.

Lubrication only once a year: For the continuously moving joints, self-aligning ball bearing units are used, which are universally available, very reliable and only require greasing once a year. Other bearings and pivots which only move intermittently, are made from polymeric materials or hardwood.

Pumps and pipelines: The pump consists of a single-acting cylinder. The cylinder diameter is selected to suit the required pumping head. For pumping a long distance to a remote tank, an air chamber may be incorporated. This smooths out  the pump pulsations and reduces the stresses on the mechanism.

Automatic Storm Protection: Poldaw Windpumps protect themselves from damage in very strong winds, by turning the rotor edge-on to the wind. This takes place automatically in wind speeds of over 50 km/h, and enables the windpump to withstand storms of up to 180 km/h (50 m/s). When the wind drops again the rotor resumes its normal position facing the wind.

Pumping Performance

The output capacities for the range of possible Poldaw Windpump applications can be seen in the following tables:

Poldaw 5.0m Windpump (Approximate outputs in litres per 24 hours):

Total Pumping Head Light Wind – 3 m/s Medium Wind -4 m/s
Feet (Metres) Litres/day Litres/day
15 5 85,000 180,000
30 10 41,000 90,000
50 15 27,000 60,000
80 25 16,000 39,000
100 30 14,000 32,000
150 45 9,000 22,000
200 60 7,000 16,000
250 75* 5,500* 13,000*
300 90* 4,500* 11,000*
400 120* 3,400* 8,000*
500 150* 2,700* 6,000*
600 180* 2,200* 5,000*

* Note – to achieve these outputs on heads of 75m+, spring counterbalancing is required.

Poldaw 3.5m Windpump (Approximate outputs in litres per 24 hours):

Total Pumping Head Light Wind – 3 m/s Medium Wind– 4 m/s
Feet (Metres) Litres/day Litres/day
15 5 45,000 90,000
30 10 22,000 45,000
50 15 15,000 29,000
80 25 9,000 16,000
100 30 7,000 13,000
150 45 4,700 8,000
200 60 3,000 5,500
250 75 2,200 4,000

Poldaw 2.2m Windpump (Approximate outputs in litres per 24 hours):

Total Pumping Head Light Wind – 3 m/s Medium Wind– 4 m/s
Feet (Metres) Litres/day Litres/day
15 5 15,000 32,000
30 10 7,000 15,000
50 15 5,000 9,000
65 20 3,500 6,700
80 25 2,500 5,000

Poldaw 1.8m Windpump (Approximate outputs in litres per 24 hours):

Total Pumping Head Light Wind – 3 m/s Medium Wind– 4 m/s
Feet (Metres) Litres/day Litres/day
15 5 10,000 24,000
30 10 5,000 11,000
50 15 3,500 7,000
65 20 2,500 4,800
80 25 1,900 3,500

Easy and Safe Installation Procedures:

Installation can be performed by two or three people and takes less than three days under normal circumstances:

  • Day 1. The foundations are dug and filled with concrete, using a template to position the steel anchor points.
  • Day 2. The windpump is completely assembled with the tower lying horizontally supported on a trestle.
  • Day 3. Using a cable winch and gin-pole, the windpump is raised to its vertical position, as shown below. The pump and pipework etc. are assembled and connected.

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