ATB, Tugs & Barges

Choice ATB/Tugs/Barge projects have included:

  • Survey, 3D Scans and Modelling
  • Ballast Water Flow Analysis
  • BWMS Feasibility Studies
  • Basic Design Engineering
  • Detail Design Engineering
  • Class Documentation and Approvals

Stability is of critical importance in a tug or ATB and oftentimes the need to treat ballast water for these types of vessels can be very limited. Due to this, Choice frequently looks to alternative treatments or creative options when recommending a BWMS to these shipowners.

In the pre-planning phase of a BWMS retrofit for Tugs and Barges, it is often necessary analyze the total ballast volume, ballasting cycle per year and operational costs. This is important in determining the best BWMS solution for that particular vessel. Occasionally, depending on the results of the analysis, shipping route and CAPEX, a modular BWMS units may also be included in the feasibility study.

ATB’s may require retrofits on both the tug and barge. The Choice engineering team has the experience delivering full feasibility and fit-for-purpose studies to assist offshore marine companies in determining the right solution for their needs.

Case Studies

McDermott North Ocean 102

Services: 3-D Scan and survey; DNV GL Class and Flag Documentation and Approval; Ballast Water Management Plan; Installation Project Management at Drydock; Engineering Support at Commissioning

Description: The Scope of Work included a 3D scan of the vessel, the pre-survey included the collection and review of vessel drawings, vessel operations, and data. They also reviewed and evaluated vessel’s current ballasting procedure and process. Class & Flag State submittals and a completed Ballast Water Management Plan for the vessel were also part of Choice’s Scope of Work for this vessel.

Additionally, Choice was responsible of the installation of BWMS and any new components integral to the operation of the system including the electrical and control panels, treatment system, filtration system, and new piping to support the BWMS. Choice also supported the testing and commissioning of the BWMS in collaboration with the manufacturer and Class.

Ballasting Challenges: North Ocean 102 is a modern flex-lay vessel, designed for global operations configured with port and starboard ballast pumps servicing port and starboard ballast mains with a crossover line, both ballast pumps are typically used for ballasting and deballasting. The vessel is not arranged to allow for gravity ballasting or de-ballasting through the BWMS. The heeling pump is arranged to transfer water rapidly between only these tanks. The tanks are normally filled and discharged by the main ballast pumps.

Solution: Two Optimarin BWMS’s (one system / per ballast pump) were connected to service the vessel’s ballast system. The BWMS filters, UV reactors, flow and pressure valves, flow meters, and control panels were installed in the Port and Starboard Pump Rooms. The UV power cabinets and distribution panels were installed aft of the Pump Rooms in the Port HPU Room. New piping was installed to connect the existing ballast piping to the BWMS. Two new overboard lines with electro-pneumatically operated shell valves were installed in the Pump Rooms to support the BWMS filter drain line and BWMS operation. Only minor piping tie-ins were made to accommodate installation of the BWMS.

For ballasting operations utilizing the BWMS, incoming seawater is pumped through the BWMS filter and UV reactor and then into the ballast tanks. For de-ballasting operations the BWMS filter is by-passed and water from the ballast tanks is passed through the UV reactor prior to discharge overboard. These major pieces of equipment were positioned to allow routing of ballast and drain line piping connected to this equipment while providing adequate clearance for operation and service. The 3D arrangement was provided to depict the major BWMS equipment and arrangement within the new treatment space.

McDermott Derrick Barge No. 50

Services: Feasibility Study; 3-D Scan and survey; BWMS Compliance Stragegy; USCG Extension Request; ABS Class Documentation and Approval  

Description: The Scope of Work was vessel-specific to Derrick Barge No. 50 and included various elements to support the Ballast Water Management System (BWMS) installation. Choice Ballast Solutions conducted a survey and 3D scan of the vessel. The pre-survey included the collection and review of vessel drawings, vessel operations, and data. This step was followed by Basic Engineering Drawings provided by Choice’s sister company, NETSCo, which included piping schematics, flow analysis, electric load analysis and conceptual installation arrangement.

Additional services included a BWMS Compliance Strategy Plan which incorporated into it a BWMS Feasibility Study and Basic Engineering Design as well as any unique issues with the vessel that would impact the installation. In addition, the Plan included, Class approvals for design, survey, and a BWMS purchase order in support of a USCG Extension request.

Ballasting Challenges: The Derrick Barge No. 50 is a heavy-lift and deep-water lowering vessel configured with port and starboard ballast pumps servicing port and starboard ballast mains with a crossover line and ballast water tank capacity of 7,769,298 usg.

Solution: A new Optimarin Ballast Water Management System was installed to service the existing ballast system. One Optimarin BWMS was connected to service the vessels ballast system. The BWMS filter, UV reactors, flow and pressure valve, flow meter, and control panels were installed in the Engine Room. The UV power cabinets and distribution panel were installed in the Engineer’s Workshop and Store.

New piping was installed to connect the existing ballast piping to the BWMS, allowing the existing ballast overboard discharge to be re-used. The existing emergency bilge suction from the port ballast pump suction piping was removed and reinstalled in the starboard ballast pump suction piping. The port ballast pump was moved inboard to free up space to make connections to the BWMS in the pump discharge piping. One new overboard line with a manually operated shell valve was installed in the Engine Room to support the BWMS filter backflush line.

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