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Getting More From The ROV Fleet - The Role Of Engineered Buoyancy
ROV owners and operators are under pressure to deliver greater capability from their equipment. Additional sensors, intervention tools and changing mission requirements must be accommodated within the limits of each vehicle’s size, weight and deployment arrangements. Achieving the right balance calls for careful engineering of mission-critical components, including buoyancy.
Buoyancy is central to that balance. The material selection, the available geometry and its distribution around the vehicle all influence the designer’s choices. For existing fleets, the condition of buoyancy modules also matters when assessing whether equipment can continue to meet operational requirements.
As ROV’s evolve, paying closer attention to buoyancy offers an opportunity to improve capability and make better-informed decisions about investment in both new and existing assets.
Making space for capability
Compact ROV design brings the relationship between volume and uplift into sharp focus. Additional buoyancy can support greater payload, but the available space is finite. Increasing the vehicle’s dimensions may undermine the compact footprint that makes it suitable for its intended deployment.
Selecting an appropriate material is therefore only part of the task. Module geometry, the arrangement of available buoyancy volume and integration with the surrounding structure need to be considered in parallel.
Base Materials’ work with Rovtech on its VALOR ROV illustrates this challenge. The compact ROV platform required a buoyancy solution that could deliver the necessary uplift within a restricted envelope for shallow-water operations down to 300 metres.
Working collaboratively, the teams combined a low-density copolymer foam with a refreshed design.
Precision-machined modules were tailored to meet the VALOR’s compact geometry, with fit checks, visual inspection and payload testing used to assess the solution. The approach increased payload capability, with uplift improvements of 15%, enabling greater flexibility across inspection and intervention tasks.
The wider lesson is that the useful performance of a buoyancy system depends on how it is engineered into the vehicle. Early collaboration between the vehicle designer and buoyancy manufacturer helps establish where changes can make a practical difference.
Verifying performance at depth
Buoyancy modules play a vital role in enabling ROVs to maintain the balance required for efficient operation. Their performance depends on the material selected, the accuracy of the finished module and its ability to withstand the intended operating conditions.
If a buoyancy material absorbs water over time, its uplift reduces. Testing water absorption helps engineers assess this behaviour, while hydrostatic testing provides evidence of performance under pressure. Calibrated weight-in-air and weight-in-water measurements verify that finished modules deliver the specified buoyancy, supporting the vehicle’s intended balance and manoeuvrability.
Dimensional inspection is equally important. Laser scanning can be used to check the finished geometry against the design, helping identify discrepancies that could affect fit and integration. Together, these checks connect material performance with the requirements of the complete ROV.
Independent certification provides supporting evidence. Base Materials has achieved DNV type approval across its Subtec® syntactic buoyancy material range, alongside Approval of Manufacture. These approvals support material selection and quality assurance; the complete vehicle still requires its own engineering assessment.
Assessing the fleet already in service
New vehicle programmes are only one part of the picture. Operators also need to understand the condition and remaining usefulness of existing equipment. Visible damage to a module’s protective coating does not, on its own, establish whether the underlying buoyancy material needs replacement. Equally, a cosmetic repair cannot demonstrate that a module remains suitable for service.
A structured assessment provides a stronger basis for the decision. Base Materials’ repair and refurbishment service includes inspection of the material core and metallic inserts, calibrated weight-in-air and weight-in-water testing, and dimensional laser scanning.
Depending on the findings, work can include replacing damaged sections or inserts, repairing surface damage and renewing the protective coating. The assessment determines whether refurbishment is appropriate for the intended application.
Base Materials’ work with Forum Energy Technologies (FET) demonstrates the potential of this approach. The company refurbished two sets of buoyancy modules for FET’s XLX work-class ROVs, including modules that were already 15 years old. The project extended the useful life of existing equipment and retained material that would otherwise have required replacement. The suitability of each module for refurbishment depends on its condition and intended service.
Engineering for operational value
Whether increasing the payload of a compact platform or extending the service life of existing buoyancy systems, tailored engineering can help operators retain more value in their ROV fleets. Material selection, accurate manufacture and verified performance all contribute to that objective.
By working closely with a specialist buoyancy partner, vehicle manufacturers and operators can identify practical opportunities to improve capability, assess existing assets and specify solutions that meet the unique demands of the industry.
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