Desalination for Marine Applications

Compact, reliable solutions for SWRO at sea

Marine and offshore applications place special demands on their seawater reverse osmosis (SWRO) systems.

At sea for days and even months at a time, running out of fresh water is not an option for passengers and crews. Nor are quick service calls in case of malfunction. That’s why operational reliability and low maintenance are key for mission-critical components like high-pressure pumps and ERDs.

Like all other seawater desalination applications, energy efficiency also matters at sea, where every drop of diesel saved is a drop earned. Finally, because space is precious onboard most platforms and vessels, compact designs are much preferred to bulkier alternatives.

Danfoss has a decades-long track record in providing the high pressure for marine SWRO applications. Every day across the seven seas, our proven range of APP pumps and iSave ERDs provide unparalleled reliability for vessels of many types and sizes.

Our customers can expect unsurpassed energy efficiency and the most reliable, low-maintenance operation of any comparable solution – all in the smallest footprint on the market.

Features and benefits

Highest efficiency rates in the industry
High reliability is achieved by selecting highly corrosion resistant materials
Simple design ensures low maintenance
Fewer parts and a compact design save space for other purposes onboard a ship
Oil free lubrication eliminates the risk of contamination
Pressure independent solutions offers flexibility when sailing between different waters

How SWRO helps marine salmon aquaculture

Learn how SWRO plays an innovative and important role in keeping salmon raised in marine aquaculture free from parasites through freshwater treatment on specially built wellboats.

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Application areas within marine

The aquaculture industry relies on well boats to transport smolt to sea, sort and move fish between sites, and sea lice treatment. The world’s leading well boat designers choose Danfoss APP pumps for off-shore aquaculture for energy efficiency and reliability, of course, but also because they present zero risk of oil contamination and easily adapt to pressure changes.

Learn how farmed salmon are kept healthy and profitable

Temporary homes for thousands of passengers and crew, many cruise ships have similar freshwater needs to a small town. Yet, they are constantly on the move. Cruise ship operators the world over rely on Danfoss APP pumps and iSave ERDs for reliable low-maintenance and energy-efficient SWRO. Compact size makes the APP pumps ideal where space is at a premium.

Learn why ship operators choose SWRO for fresh water

The last thing owners of multi-million-euro yachts want to worry about is their next glass of water or water for their deck washdown. That’s why more and more shipyards specify dependable onboard SWRO systems based on compact, reliable Danfoss technology. This together with low maintenance and long service intervals make the APP pumps the optimal choice for yacht owners.

Innovative marine SWRO builds on Danfoss APP pumps

50% less energy

By using APP high-pressure pumps and iSave ERDs from Danfoss, the energy consumption was reduced by 50% compared to other SWRO solutions

How to remove sea lice from salmon gently

SWRO is an innovative and safe way to eliminate sea lice from salmon for them to stay healthy and profitable

Related products

MPE 70 energy recovery device for medium to large SWRO applications

The first active ERD for medium and large plants, the MPE 70 integrates highly effective isobaric pressure exchangers with a low-voltage motor to eliminate the risk of rotor overspin, reduce mixing and biofouling, and facilitate smarter automation. Covering train sizes from 1,500 m3/day and above.

High-pressure pumps for SWRO applications

The range of high-pressure APP pumps is optimized for both landbased, off-shore and marine sea water reverse osmosis applications. Available with or without motor.

iSave® energy recovery devices for high-pressure membrane applications

With a 3-in-1 design that integrates highly effective isobaric pressure exchangers with positive displacement booster pumps and electrical motors, active iSave® ERDs deliver big energy savings in small spaces. Covering train sizes from 200-3,000 m3/day

Case stories

Danfoss components provide energy-efficient fresh water for shrimp farm

Compact, reliable and energy-efficient pump and ERD from Danfoss are chosen for SWRO plant producing fresh water for a shrimp farm located in an environmentally sensitive area.

Danfoss technology reduces energy consumption in salmon industry with 50%

Energy efficient pumps and energy recovery devices help the Norwegian aquaculture industry to remove sea lice from salmon gently, sustainable, and effectively.

Danfoss APP pumps outperform plunger pumps

SK Watermakers has selected oil-free APP pumps for many of their marine applications due to proven reliability, easy maintenance and long service intervals.

Innovative marine SWRO builds on Danfoss APP pumps

HP Watermakers innovates reliable SWRO solutions with Danfoss APP pumps. Based in Milan, HP Watermakers designs and manufactures an innovative range of SWRO plants for marine and onshore applications.

Efficient Danfoss components aboard world’s largest wellboat

Learn how Quantum Water selected Danfoss APP high-pressure pumps, iSave ERDs, and VFDs for the SWRO plant on the world's largest wellboat to save space, energy, and maintenance.

Peter Taboada tailors energy-efficient wellboat with Danfoss technology

Peter Taboada works closely with wellboat builders to meet their water-making needs. The company focuses on reliable energy efficiency that makes optimal use of available space to maximize their customers’ ROI.

WatMan specifies Danfoss for the world’s largest cruise ship’s SWRO plant

WatMan Engineering chose Danfoss high-pressure pumps and energy recovery devices as key components in the SWRO plant that supplies fresh water to the world’s largest cruise ship, Icon of the Seas.