Is the axial piston pump the next big efficiency gain?

John P MacHarg, Ocean Pacific Technologies, and Bradley Sessions, AQC Ltd, USA

More and more SWRO plants running parallel trains
Danfoss RO Solutions, Netherlands Two articles on the same theme: are we about to see a move away from large high-pressure centrifugal pumps for RO desalination in favour of multiple modules with smaller pumps?

The first reviews modular positive-displacement waterlubricated axial-piston pump systems, revealing that this new concept is not only a cost-effective alternative to traditional pump systems, but that it is simpler to operate and brings other advantages during the SWRO facility operating period.

This is a shortened and updated version of a paper presented at the International Desalination Association's 2013 World Congress in Tianjin, China.

The second article reports that more and more small and medium-sized SWRO plants - even containerized solutions - are specifying multiple trains.

This article first appeared in the November/December 2013 issue of Desalination & Water Reuse magazine.

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