Desal Supplies

Unit 9, Canal Street Works

Rochdale, Lancs, OL11 1AB

Tel: +44 (0)1706 869777 / Email:

New APP11 to 13 Range of Pumps

Danfoss has completed its range of high-pressure pumps for small and medium-sized reverse osmosis (RO) plants with the introduction of the APP11-13. With its capacity of 11 to 13 m³/h, the new APP 11-13 range is ideal for RO systems that produce 100 to 125 m³/d. If the APP 11‑13 is coupled to the iSave, Danfoss' integrated isobaric energy-recovery device, it can even handle up to 250 to 300 m³/d.

"A lot of customers have been waiting for us to complete development on these pumps, "says Jesper Bentzen, sales director for the Danfoss RO Division. "Worldwide, we expect strong growth in the market for small and medium-sized RO plants and our latest pump - with a capacity that is ideal for many smaller commercial applications - is going to be right at the sweet spot for many projects”.

Like the rest of the APP pump portfolio, the new APP 11‑13 range packs a lot of power into a small and efficient package. No other high-pressure pump on the market is smaller or lighter, and with volumetric efficiencies of upto 97%, very few can claim to be as efficient with electricity.

The axial piston design results in constant flow regardless of pressure variations, and utilises fewer moving parts for improved reliability and reduced maintenance costs. Belt drives and pulsation dampers are both things of the past with the APP series; also no oil lubrication is required as the pumped medium itself lubricates moving parts.

"For most of our customers these days, simple maintenance and reliability are increasingly important", says Bentzen. "And with energy prices climbing everywhere, energy efficiency is a must. The APP 11‑13 range delivers on all of these criteria but its compact design also allows engineers to configure it into many tight spaces - either horizontally or vertically - thereby providing a lot of design flexibility both on and offshore".

The Danfoss range of APP pumps now extends from 0.6 m³/h upto 38 m³/h. Many APP pump sizes are fully compatible with the Danfoss iSave, which further increases energy savings by up to 60% and eliminates the need for separate high-pressure flow meters, exchangers and booster pumps.

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