Floating production units and drilling rigs operate in some of the most demanding offshore environments. Unlike conventional vessels, FPSOs, FLNG units, semi-submersible rigs and jack-up rigs often remain on station for extended periods, where downtime, production interruptions, restricted access and subsea integrity risks can have significant operational and commercial consequences.
Routine underwater inspection, repair and maintenance, also known as IRM, is essential to sustaining asset integrity, supporting safe operations, maintaining production reliability and meeting client, class, environmental and offshore compliance requirements.
OSC Marine provides professional husbandry and subsea support services for FPSOs, FLNG units, semi-submersible rigs, jack-up rigs and related offshore structures, delivering safe, efficient and fully documented underwater solutions designed around operational continuity.
Your Trusted Partner in FPSO, FLNG & Rig Husbandry
OSC Marine delivers coordinated husbandry, inspection, repair support, cleaning and subsea maintenance services for offshore production and drilling assets.
Our capabilities include:
- Planned and reactive offshore husbandry support
- Underwater inspection, repair and maintenance (IRM) support
- Purpose-selected equipment for offshore marine environments
- Commercial diving and ROV inspection support
- Class and client-aligned inspection documentation
- Photographic, video, CCTV and written reporting
- Cleaning and marine growth removal for critical underwater areas
- Rapid mobilisation for planned and emergency offshore interventions
- Compliance with client, class, port, environmental and offshore safety requirements
Our experience working with ship owners, operators, agents, marine contractors and offshore technical teams allows us to coordinate efficiently and work within tight operational windows.
Contact OSC Marine today to discuss your FPSO, FLNG or rig husbandry requirements.
Asset-Specific Offshore Husbandry Services
Different offshore assets have different underwater requirements. OSC Marine provides asset-specific husbandry solutions based on the operational profile, structural configuration, and integrity requirements of each unit.
FPSO Husbandry Services
FPSOs rely on critical underwater systems that support production, storage, offloading, station keeping, and asset integrity. OSC Marine provides underwater husbandry and IRM support to help operators maintain inspection readiness, manage underwater integrity risks and reduce avoidable production interruptions.
FPSO husbandry services may include:
- Turret inspections
- Mooring chain inspections
- Riser porch inspections
- Sea water lift system inspection and cleaning
- Cargo tank external structure inspections
- Offloading system inspection support
- Sea chest and intake cleaning
- Hull and flat-bottom cleaning
- Cathodic protection and anode visual assessments
- Pre-inspection cleaning for class or client surveys
- Damage and condition assessments following operational incidents
FLNG Husbandry Services
FLNG units combine offshore gas production, processing, liquefaction, storage and loading operations within a complex floating asset. OSC Marine supports FLNG operators with practical underwater services that align with safety, reliability and operational continuity requirements.
FLNG husbandry services may include:
- Inspection of cryogenic process support areas where relevant to underwater or external structural interfaces
- LNG loading system inspection support
- Offshore gas production infrastructure interface inspections
- Safety-critical underwater interface inspections
- Mooring and riser interface inspections
- Sea chest, intake and discharge area inspections
- Marine growth assessments
- Underwater cleaning for inspection readiness and operational efficiency
- CCTV, photographic and video-documented inspection reporting
- Emergency underwater condition assessments
Semi-Submersible Rig Husbandry Services
Semi-submersible rigs have complex underwater structures; these areas require regular inspection and maintenance support to manage marine growth, corrosion exposure, structural condition and operational readiness.
Semi-submersible rig husbandry services may include:
- Column inspections
- Pontoon inspections
- Bracing structure inspections
- Thruster unit inspections and cleaning support
- Positioning system inspection support
- Sea chest and intake inspections
- Marine growth removal from submerged structures
- Splash zone and submerged component inspection
- Pre- and post-project condition surveys
- Inspection support before or after rig moves
- CCTV-monitored commercial diving inspections
- ROV visual inspection support where required
Jack-Up Rig Husbandry Services
Jack-up rigs require specific underwater inspection and husbandry attention, especially areas exposed to seabed interaction. These inspections are especially important before and after rig moves, pre-loading operations and site-specific deployments.
Jack-up rig husbandry services may include:
- Leg inspections
- Spud can inspections
- Pre-load inspections
- Rig move inspections
- Underwater structural inspection
- Condition assessments before or after relocation
- Marine growth inspection and cleaning
- Damage assessment following seabed contact or operational events
- CCTV, video and photographic documentation
- NDT support where required
Mooring System, Turret and Riser Interface Inspection
Mooring systems are critical to the safe station keeping of FPSOs, FLNG units and other floating offshore assets. Regular inspection of mooring components helps operators identify damage, wear, corrosion, abnormal loading indicators and integrity concerns before they develop into more serious operational risks.
OSC Marine provides underwater inspection support for:
- Mooring chains
- Anchors
- Fairleads
- Chain stoppers
- Turret systems
- Riser interfaces
- Riser porch areas
- Mooring line touchdown zones where accessible
- Subsea and floating asset interface points
- Offshore loading and station-keeping infrastructure
Our mooring inspection services support requirements such as:
- FPSO mooring inspection
- FLNG mooring inspection
- Mooring chain survey
- Turret inspection
- Riser interface inspection
- Post-incident mooring condition assessment
- Visual inspection for class, client or asset integrity records
Inspection findings are documented using photographic, video, CCTV and written reporting to support technical review, maintenance planning and asset integrity management.
Offshore Survey and Inspection Solutions
OSC Marine conducts underwater survey and inspection services to support routine integrity monitoring, class-related inspection requirements, damage assessment, maintenance planning and repair decision-making.
All inspections are completed with clear documentation, enabling operators, technical authorities, asset integrity managers and marine engineers to make informed maintenance, repair and operational decisions.
Our survey capabilities include:
- Underwater hull, column, pontoon and structural inspections
- Mooring and riser interface visual inspections
- Turret and riser porch inspections
- Sea chest, thruster, intake and discharge area inspections
- Photographic and high-definition video documented surveys
- CCTV-monitored commercial diving inspections
- Marine growth assessments
- Non-destructive testing support where required
- Cathodic protection and anode visual assessments
- Asset integrity and maintenance planning support
- Insurance and incident-related inspections
- Pre- and post-project condition surveys
- Splash zone and submerged component inspections
- Jack-up leg, spud can and underwater structural inspections
- Condition assessments before or after rig moves
Underwater Cleaning and Performance Maintenance
OSC Marine provides underwater cleaning and maintenance services designed to support asset performance while protecting sensitive components and coating systems. Using suitable equipment and controlled methodologies our teams provide effective cleaning solutions.
Our underwater cleaning services include:
- Hull and flat-bottom cleaning
- Column, pontoon and brace cleaning
- Sea chest and intake cleaning
- Grating, screen and filter cleaning support
- Thruster tunnel and propulsion area cleaning
- Removal of marine growth from submerged structures
- Pre-inspection cleaning for class, client or integrity surveys
- Cleaning around critical access points and underwater fittings
- Cleaning support for seawater lift and cooling system efficiency
- Localised cleaning to enable close visual inspection or NDT support
Inspection, Repair and Maintenance Support
OSC Marine supports IRM campaigns by combining survey, cleaning, minor intervention and documented reporting into a coordinated offshore service. Where repair works require additional engineering input, class involvement or specialist procedures, OSC Marine can support the underwater access, inspection, preparation and documentation requirements needed for the repair campaign.
Our IRM support may include:
- Underwater inspection and condition assessment
- Cleaning before inspection or repair work
- Minor underwater repair support
- Temporary repair support where suitable and approved by the client
- Support for repair planning and engineering campaigns
- Marine growth removal around damaged or restricted-access areas
- Inspection support following repair completion
- Photographic and video evidence for technical review
- Reporting to support follow-up maintenance or engineering decisions
Offshore Inspection Technologies
OSC Marine uses suitable inspection technologies based on the asset, water depth, access conditions, scope complexity and client requirements. Combining the correct technology with experienced personnel helps improve inspection quality, reduce operational disruption and deliver reliable records for technical and compliance purposes.
Inspection technologies may include:
- Work-class ROVs where required for complex subsea tasks
- Observation ROVs for visual inspection and limited-access areas
- Commercial diving inspection teams
- CCTV inspection systems
- High-definition camera systems
- Photographic and video documentation
- Non-destructive testing technologies where required
- Cathodic protection monitoring support
- Digital inspection reporting
- UAV drone support for above-water or difficult-access visual surveys where applicable
Diver or ROV Inspection
Selecting between commercial divers and ROVs depends on the inspection environment, water depth, access conditions, safety considerations, intervention requirements and the level of physical interaction needed.
Divers are typically used for:
- Close visual inspection
- Underwater cleaning
- Minor intervention
- NDT support
- Localised inspection of fittings, sea chests, intakes and structures
- Tasks requiring tactile assessment or hands-on work
- CCTV-monitored inspection in suitable diving conditions
ROVs are typically used for:
- Deep-water inspections
- Hazardous environments
- Extended surveys
- Limited-access areas
- Mooring and riser interface inspections
- Visual surveys where diver access is restricted
- Situations where continuous monitoring or remote access is preferred
OSC Marine helps clients select the most suitable method based on safety, efficiency, data quality and operational constraints. In some cases, a combined diver and ROV approach may provide the most effective solution.
Classification Society and Survey Support
FPSOs, FLNG units, rigs and offshore structures are often subject to periodic inspection requirements aligned with classification society, flag, client and regulatory expectations. OSC Marine supports underwater inspection and husbandry activities that help operators prepare for, complete or respond to survey requirements.
OSC Marine does not claim classification approval or accreditation through this service. Instead, our role is to provide underwater access, inspection support, cleaning, evidence collection and reporting that assists operators, surveyors and technical teams.
Inspection support may relate to:
- Annual surveys
- Intermediate surveys
- Special surveys
- UWILD support where applicable
- Condition assessments
- Damage surveys
- Pre-survey cleaning
- Follow-up inspection after corrective action
- Documentation for technical and compliance records
Emergency Offshore Inspection and Rapid Mobilisation
Unplanned offshore incidents require fast, practical and well-documented underwater inspection support. OSC Marine provides responsive husbandry and subsea intervention services.
Emergency offshore inspection may be required after:
- Anchor impact
- Vessel collision
- Dropped object incidents
- Extreme weather events
- Mooring failures
- Suspected structural damage
- Contact with subsea or seabed infrastructure
- Abnormal vibration or performance concerns
- Seawater intake restrictions
- Thruster, hull or underwater fitting damage
Related Offshore Assets Supported
In addition to FPSOs, FLNG units and rigs, OSC Marine can support a range of related offshore assets and marine infrastructure. Our flexible approach enables us to support asset owners, operators and contractors across a broad range of offshore inspection, cleaning and maintenance requirements.
Related offshore assets may include:
- CALM buoys
- SBM systems
- Single point moorings
- Mooring systems
- Offshore loading terminals
- Floating storage units
- Offshore support structures
- Offshore substations
- Renewable energy structures
- Marine terminals
- Submerged infrastructure associated with offshore production or loading operations
Safety, Compliance and Reporting
Safety and compliance are central to every OSC Marine operation. Our husbandry services are planned and executed in accordance with applicable marine, offshore, port, environmental and client-specific requirements.
We provide:
- Job-specific planning and risk assessment
- Competent commercial diving personnel
- Suitable equipment selection for each scope
- Permit and operational coordination support
- Environmental awareness and control measures
- CCTV, photographic and video evidence where required
- Structured inspection and maintenance reports
- Clear recommendations for follow-up action
- Documentation to support maintenance, class, client and integrity records
Why Choose OSC Marine?
OSC Marine provides dependable husbandry and subsea support for complex marine and offshore assets.
Clients choose OSC Marine for:
- Experience in underwater inspection, repair support, maintenance and marine services
- Practical solutions for FPSOs, FLNG units, rigs and offshore structures
- Asset-specific husbandry expertise
- Mooring, turret, riser interface and underwater structural inspection support
- Responsive operational and emergency support
- Experienced commercial diving and ROV-capable teams
- Ability to work around operational constraints and tight project windows
- Focus on reducing downtime and supporting asset reliability
- Clear photographic, video and written reporting
- Safety-focused planning and execution
Whether supporting planned maintenance, inspection readiness, class-related surveys, asset integrity programmes or urgent offshore intervention, OSC Marine delivers professional husbandry solutions designed around safety, performance and operational continuity.
Contact OSC Marine today to discuss your FPSO, FLNG or rig husbandry requirements.
Frequently Asked Questions
How does inspection data support asset integrity management?
Accurate inspection data allows operators to monitor deterioration, plan maintenance, assess risk and support compliance obligations over the operating life of the asset.
Inspection data can support:
- Risk-based inspection programmes
- Corrosion monitoring
- Life-extension studies
- Maintenance planning
- Class compliance
- Repair planning
- Risk assessment
- Operational decision-making
- Integrity review by asset integrity managers, technical authorities and marine engineers
- Evidence-based maintenance prioritisation
What are some common FPSO, FLNG and rig husbandry challenges?
Offshore assets face a combination of environmental, operational and technical challenges that make underwater husbandry essential.
Common challenges include:
- Marine growth accumulation
- Corrosion exposure
- Restricted underwater access
- Continuous production or drilling operations
- Deep-water or remote offshore locations
- Production downtime risks
- Tight weather windows
- Regulatory and class-related requirements
- Safety-critical subsea interfaces
- Mooring and station-keeping integrity risks
- Limited access to sea chests, intakes, thrusters and structural components
- Requirement for accurate inspection records and traceable reporting
Can husbandry work be carried out while the asset remains operational?
Yes. Conducting these interventions on-site helps operators avoid the massive financial losses and logistical complications of pulling an asset into a dry dock. To prevent interference with ongoing drilling or extraction, teams utilize strict Simultaneous Operations (SIMOPS) frameworks that meticulously coordinate maintenance schedules with active drilling or production schedules.
Does OSC Marine provide documentation after inspections or maintenance?
The OSC Marine Group provides fully traceable and compliant reporting packages tailored to classification society standards. Deliverables feature comprehensive real-time inspection reporting, high-definition video feeds, and photographic condition assessments.
How does husbandry support asset integrity management (AIM)?
Ongoing husbandry inspections function as an early warning system against structural degradation caused by constant wave action, chemical corrosion, and mechanical strain. The physical measurements gathered during these checks are fed directly into risk-based tracking models to monitor changes like steel wall-thickness loss or micro-cracking over time. This stream of data allows operators to make informed decisions regarding life-extension strategies and targeted engineering upgrades for older rigs.
What role do Offshore Support Vessels (OSVs) play in rig husbandry?
Offshore Support Vessels, or OSVs, often provide the working platform, logistics support and operational base to support diving teams, ROV systems, inspection equipment, cleaning tools, personnel transfer, deck operations and emergency response activities. For offshore assets located away from port infrastructure, OSVs help enable safe, efficient and controlled execution of underwater inspection and maintenance work.
How frequently must structural and marine husbandry inspections occur?
FPSOs, FLNG units and rigs operating in harsh or high-growth marine environments may require more frequent surveys, while planned campaigns are often aligned with integrity management programmes, class inspection windows, maintenance schedules or operational shutdown periods.
How do teams safely execute underwater maintenance given the high-risk environment?
Underwater maintenance is executed through detailed planning, formal risk assessment, competent personnel, controlled work procedures, permit coordination, communication protocols, emergency response planning and suitable equipment selection. OSC Marine maintains strict compliance with global International Marine Contractors Association (IMCA) guidelines, following standardized diving safety buffers and medical response contingencies.
Why are Lockout-Tagout procedures and IMCA guidance important during husbandry work?
Strict Lockout-Tagout procedures are essential because divers and subsea teams may be working near hazardous equipment such as thrusters, sea chests, intakes, discharges, valves, pumps and moving machinery. LOTO helps ensure that hazardous energy sources are isolated before work begins. IMCA guidance provides recognised offshore industry best-practice resources, including guidance for diving, marine, ROV and safety-related operations, supporting safe planning and execution of offshore work.
What technologies are improving offshore husbandry inspections?
Modern husbandry inspections increasingly use technologies such as ROVs, UAV drones, high-definition video, CCTV recording, digital reporting tools and Non-Destructive Testing. These technologies improve visibility, access, documentation and inspection accuracy, particularly in areas that may be difficult, deep, restricted or hazardous for manual inspection.
How is Non-Destructive Testing (NDT) used in offshore husbandry and inspection programmes?
Non-Destructive Testing is used to assess the condition of structures and components without causing damage, supporting integrity monitoring and maintenance planning. When combined with diver inspection, ROV footage and detailed reporting, these technologies provide a more complete view of asset condition across underwater, splash-zone and topside-adjacent areas.