MSS Series Feed Pumps

Multistage centrifugal high-pressure feed pumps that provide a new level of reliability and efficiency in seawater reverse osmosis pumps

  • 7.5 – 295 m3/h (33 – 1300 gpm)
  • Pressures to 83 bar (1200 psi)
  • Duplex SS Pressure Containment
  • Impeller and Diffuser are 316 SS – electropolished & passivated

MSS pumps are multistage centrifugal feed pumps specifically designed for brackish and seawater reverse osmosis service, representing the most reliable high-pressure feed pump available today.

Loaded with unique features such as the patented Water Bearing™  thrust bearing, product-lubricated shaft bearings, and maintenance-free design, the MSS ensures years of trouble-free operation. The MSS also features one of the longest warranties in the industry – a full 18 months of coverage from the date of product installation.

  1. Shaft seal operates at low pressure
  2. Flexible disc coupling
  3. Bearing drain line (low pressure)
  4. 316 SS shell support bracket
  5. Precision leveling foot
  6. Grooved end pipe joints
  7. Duplex SS 2205 housing
  8. Flanged construction for easy internal inspection
  9. Inlet rotatable in 90° increments
  10. Easy shaft alignment
  11. Integrated motor adapter (anodized aluminum alloy)
  12. 316L SS stages – passivated & electropolished – proven in hundreds of SWRO applications

High Inlet Pressure Option

All MSS pumps can be equipped with high inlet pressure option to allow inlet pressure to 70 bar.
This unique design features:

    • Use of low-cost, standard mechanical seals, operating at a low pressure (typically 1-2 bars)
    • Total protection of the motor from pump thrust loads – a major problem with high inlet pressure operation
    • Pump shaft kept in tension – no potential for shaft buckling
    • Handles total axial thrust – no load on motor bearings
    • Never needs lubrication
    • Bearing cooled by feed water – no ambient temperature limit
    • 316L SS stages, passivated and electropolished
MSS 15 Spec Sheet
MSS 20 Spec Sheet
MSS 30 Spec Sheet
MSS 40 Spec Sheet
MSS 55 Spec Sheet
MSS 75 Spec Sheet
MSS 90 Spec Sheet
MSS 120 Spec Sheet
MSS 200 Spec Sheet

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Please contact Customer Service for Manuals and Drawings

You might also be interested in:
  • HPB Turbo – Energy Recovery Turbo can be paired with the MSS for added pressure and efficiency
  • MSD Series Feed pumps – Super Duplex construction with exceptional efficiency and flows to 850 m3/h