The A-RO pumps take Sulzer’s highly reputed AHLSTAR A series to new levels of efficiency and operation range and are optimized for the demanding conditions of seawater reverse osmosis (RO) applications.

Main benefits

•     Industry-leading efficiency
•     Wide operational envelope and optimized suction capacity
•     Optimal mechanical design to limit radial load and to compensate axial thrust
•     High-performance bearing unit
•     Renewable stationary wear parts for sustained efficiency
•     Easy maintenance with back pull-out design

Main applications

•     Low-pressure booster pump to RO high-pressure membrane feed
•     RO second pass membrane feed
•     Process applications in desalination plants

The A-RO pumps are end-suction pumps meeting or exceeding ISO 5199. The range takes Sulzer’s highly reputed AHLSTAR A series to new levels of efficiency and operational range, optimized for the demanding conditions of seawater reverse osmosis (RO) applications. The A-RO pumps are suitable for pumping seawater or liquids with similar corrosive properties up to a temperature of 60 ºC across a wide performance range by means of variable speed control. They fulfill all requirements wherever a robust pump is needed for boosting pressure as well as general process application.

Capacity: Up to 6’000 m³/h / up to 26’415 USgpm
Head: Up to 200 m / 600 ft.
Temperature: Up to 39ºC / 102ºF
Discharge Sizes: Up to 400 mm / up to 16 in. 

Wide operational envelope

•     Operation via VFD enables high-efficiency performance across a wide range of heads and flow rates
•     Optimized suction capacity for low net positive suction head required (NPSHr)

Optimal mechanical design

•     Double volute casing to limit radial load
•     Back labyrinth and balance holes to compensate axial thrust
•     Renewable stationary wear parts for optimized labyrinth gap
•     Foot mounted casing

High-performance bearing unit

•     Inboard cylindrical roller bearing
•     Outboard pair of angular contact ball bearings
•     Increased oil sump and optimized fan design for enhanced heat dissipation
•     Constant level oiler maintains optimum oil level for lubrication

Easy maintenance

•     Shaft seal can be serviced without disassembling the pipework

Industry-leading efficiency

•     Optimized pump efficiency
•     Reduced energy consumption
•     Closed impeller for higher efficiency