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On the Back of National Tunnelling Day!

A centrifugal pump is the simplest machine which is used various industries as well as in many daily applications. In 1475, Italian engineer Francesco di Giorgio Martini designated mud lifting machine as a centrifugal pump. But actual centrifugal pumps were not invented until the 17th century.

Then Denis Papin created one centrifugal pump by using straight vanes. Later, in 1851 British inventor John Appold designed curve vane.

John George Appold of Shoreditch, London was a British fur dyer, engineer and enthusiast inventor.

Perhaps the most important invention was his centrifugal pump. This procured him a 'council medal' at the Great Exhibition at the Crystal Palace in 1851, and it is highly commended in the report of the juries on that exhibition. Appold's pump with curved blades showed an efficiency of 68%, more than three times better than any of the other pumps present.

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                                                         John Appold 1800 - 1865

Impellers-1                                                       Straight Impeller vs Curved

 

• Applications of centrifugal pumps:

  1. Submersible drainage pumps
  2. Submersible sewage pumps
  3. Circulators for heating and cooling
  4. High pressure multi-stage pumps 
  5. Engine driven pumps
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                                       Appold Centrifugal Pump Advert circ: 1850

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