For vessels with few ballast water discharges per year and for older vessels, fitting an onboard unit may well be uneconomical. In recognition of this, Damen has developed its unique InvaSave Mobile Ballast Water Discharge technology, enabling in-port ballast water processing and discharge.

As an onshore facility operated by professionals and specialists, it allows for better control of the treatment processes. Operation by experienced operators also ensures more accurate regulation of the desired levels of ballast water treatment.


  • More cost efficient for certain trades and ship types
  • No downtime installation and maintenance as with onboard BWT units
  • Increased reliability due to redundancy
  • Enables contingency measures in ports in case onboard BWT units fail
  • Self-sufficient - independent of external power supply and pumping capacity
  • Better compliance monitoring
  • Application of treatment technology unrestricted by space, pressure drop and power requirements.
  • Reliable solution for both ports and operators
  • Only requires fitting a deck connection at fraction of cost of full BWT retrofit
  • Suitable for sea, fresh and brackish water
  • Chemical-free technology
  • No blocked filters and no backflush in port of ballasting
  • Gravity ballasting for ballast intake still possible
  • Enables contingency measures in ports in case onboard BWT units fail


    Dimensions container 45’ x 8’ x 9,6’ (LxWxH) High cube
    Treatment capacity
    10 – 300 m³/h
    Power consumption 70-140 kW
    Effectiveness Designed for waters with low UV transmission, fresh, brackish and sea water
    Ballast Water processing Fully automated and monitored
    Generator US/EPA Tier 3/EU Stage 3A 160 kWe
    Design pressure 10 bar
    Noise level Meets highest standards



    Why is there a market for the InvaSave technology?

    When IMO BWMC is in force there will be many vessels for which installing an on board system is too expensive. Also on board systems may fail. Even at low failure rates there will be high cost congestions in ports. There is a need for contingency measures in ports.

    Why is the InvaSave unique?

    It is the only ballast water discharge technology in the world. Other technologies are developed for on board treatment only.

    Can the InvaSave be used for retrofitting?

    It is not intended for retrofitting. But if it makes sense it can be used for that.

    Does the InvaSave treat all salinities and water qualities?

    Yes it does. We have tested both in Fresh and Salt water at low UVT’s

    What is the power consumption?

    The InvaSave can be delivered with a build in Generator. Power consumption is below 75 kW/h.

    Can the InvaSave also be used to supply treated ballast water?

    The InvaSave is intended as discharge technology. Technically it could also supply treated water. This route may not be accepted under the BWMC.

    Is the installation of an on-board ballast water treatment system economically viable for my vessel?

    For vessels with few ballast water discharges per year and for older vessels, fitting an onboard unit may not be economically efficient. Against this background Damen has developed its unique InvaSave Mobile Ballast Water Discharge Technology, enabling port-based ballast water management for routine service and emergency measures. This new technology broadens significantly the range of total ballast water solutions for ballast water compliance that Damen offers to its customers.

    What about ballast water treatment on barges?

    Barges do not have a pump room or space to fit a BWMS and just have a few ballast operations per year for transit and discharge operations. At the location of discharge only the self-sufficient Mobile Ballast Water Port Solution will treat ballast water of the barge when cargo is unloaded by crane or roll on roll off.

    How to comply to the BWMC at a dock or scrap yard or when carry out salvage?

    When a vessel is in a dock yard vessels can not always use their own Ballast water treatment installation to discharge their ballast water in the dock. Ballast Water should be drained by the dock yard and should be treated or collected as waste. The same can happen when a vessel will be scrapped or salvaged. Here the self-sufficient Mobile Ballast Water Port Solution can treat ballast water at discharge and used as a solution to drain ballast water and be in compliance with the BWMC 2004.

    Can I discharge my ballast water when I have a failure in my ballast water treatment system?

    Ballast water can not be discharged when a vessel has a failure in his ballast water treatment system.

    These vessels can safely discharge their ballast water by the Damen InvaSave with ballast water discharge technology. Operators in Ports can have InvaSave systems available in order to provide emergency assistance and the required redundancy for ship owners to stay compliant with the BWMC2004 at any time.



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