GEME Poldaw Windpumps

• Ultra-low operation and maintenance costs:
  maintenance is a simple annual procedure
• Proven, reliable, robust, sustainable technology
• Manufactured locally using readily available materials, to benefit the local economy
• Value for money, costs competitive with other pumping methods and lower than most other windpumps

Benefits of Wind pump

• No cost of energy
• No pollution
• Relatively less cost (cost effective-particularly in remote area)
• Multy-blade design allows pump to start up and operate easily at low wind speed
• Reliable robust construction
• Low noise level
• Low maintenance cost
• Easy installation

Areas of Application

GEM POLDAW range of wind pumps is suitable for Agriculture(Irrigation), Domestic, Municipal, Commercial, Industrial sectors and Natural reserves.

• Irrigation
• Water supply- Bore holes, wells & Watercourses
• Wetland restoration
• Leach ate pumping from land fill sites
• Land drainage
• Circulation and Aeration in lakes and ponds
• Water features - Fountains and Water fall
• Etc...

How much water do the GEME Poldaw Wind Pumps produce?

The performance of the GEME Poldaw Windpumps depend on pumping head (i.e. total lift required) and windspeeds. The two most popular models are the 3.5m machine (the diameter of the rotor is 3.5 metres) and the 5m machine.
For a moderate pumping head of 20m, in a medium wind speed of 4m/s, outputs are:

• Poldaw 3.5 m: 21,000 litres per day
• Poldaw 5.0 m: 43,000 litres per day

There are also smaller models, 2.2m and 1.8m, with correspondingly smaller outputs. The 3.5 metre machine can pump from depths of up to 90m, whilst the 5 metre machine can pump from 140m, now extended to 200m max by means of a spring counterbalance system.

Are there siting or wind condition constraints?

The GEME Poldaw can start up under load in the lightest of breezes and operates in wind speeds as low as 3 metres per second (approx. 7 mph). A simple test with an anemometer will confirm local wind speed conditions. A range of tower heights is available, selected to suit local topography and wind conditions, for example a sheltered site may require a tall tower. If there is doubt about the suitability of a site for a windpump, GEME Poldaw will advise.

Technical Details:

Design for low cost and high reliability:- The GEME Poldaw Windpump has a very simple but elegant design. Most successful small windpumps with a deep well capability use a speed reduction gearbox to avoid dynamic problems in the pump and pump rods. 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 thus reduces the cost and improves reliability.

Pumps and pipelines:

The pump itself consists of a simple cylinder incorporating a non-return valve at the bottom and another in the piston. The pumps vary in diameter, depending on the required pumping head. For pumping a long distance to a remote tank, an air chamber may be incorporated. This evens out the pulsing water flow from the pump and thus reduces the stresses on the windpump mechanism.

Automatic Storm Protection:

GEME 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.