The BWM Convention will enter into force on 8 September 2017. However USCG has not approved any systems yet. The adoption of all the required Guidelines for the uniform implementation of the BWM Convention and the approval and certification of modern ballast water treatment technologies have removed the major barriers to the ratification of the instrument and a number of additional countries have indicated their intention to accede to this Convention in the near future.

Challenges of the enforcement of the convention  :
– Total 60,000 ships required to be retrofitted in a short period of time
– All existing ships must start retrofitting by 2016
– The price of equipment have drastically reduced in last two years. However this may see reverse trend post ratification.
– Sudden demand for retrofits:
Equipment – high cost/high lead time/no availability
Long class approval time
Premium engineering hours


CTS Ballast Water Treatment Process


  • Study the vessel design
  • Gather the as-built data:
    – Available updated drawings
    – Available power
    – Selection of equipment
  • 3D Scanning
  • Engineering study
    – Production of PID drawings
    – Production of detailed drawings
Equipment and Piping

  • Single skid installation  OR  Multi location installation

Deciding factors:
– Availability of space
– Installation accessibility
– Minimum modifications (structural, piping, electrical)

Machinery Spaces

  • Access for maintenance
  • Additional ventilation for storage of chemicals

Pump Room

  • Explosion proof systems

Exposed Deck

  • Explosion proof systems in case of tankers
  • Increase in GT is enclosed compartment added

New Structural Void Tanks

  • Load calculation
  • Modified 1 line diagram
  • Cable ducts routings & penetrations
  • Cable installation drawing
In Situ pipe fabrication & installation

  • Less engineering required
  • High chances of rework for clash removals
  • High wastage of material & time
  • High down time for ship

Manual measurement onboard, 3D routing & pre-fab

  • Less down time for ship
  • Piper fabricated at workshop – good quality
  • Large amount of engineering time spent onboard for measurement

3D laser scan, 3D routing & pre-fab

  • Less time spent onboard
At docking/Quay side

  • Ship off-hire for a period of retrofit
  • Must in case of in-situ fabrication (hot work) & installation

During sailing/operation

  • Pipe can be pre-fabricated using pre-fabrication drawings from 3D model
  • Installation can be done during operation (cold fitting) with least interference in normal operation
  • In case of tankers hot work in cargo areas by habitat management
Class Approvals

  • Approvals for retrofit drawings
  • Coordination for class survey onboard

Workshop Coordination

  • Technical specification for retrofit
  • Job work order & workshop selection


  • Quality inspections (critical for in-situ fabrication)
  • Workshop inspections for pre-fab pipes

Testing and Commissioning

CTS Offshore and Marine expertise and cost effective solutions can support any and all phases of your project to comply with the regulations. Don’t hesitate to contact us for further information.