ROV Tools Explained: A Beginner's Guide to Subsea Tooling and Equipment

Selecting the correct tooling for an ROV operation is one of the most consequential decisions made during project planning. The wrong tool can turn a two-hour job into a two-day problem. Tooling selection depends on the task type, the ROV class, the water depth, the target structure, and the environmental conditions. This guide covers the major tooling categories and provides practical criteria for making the right choice.

Torque Tool Systems

• Hydraulic torque tools are used for valve operations, hot stab connections, and bolt tensioning
• Match the torque output range to the target valve or connector specification
• Verify the tool interface (T-handle, bucket, or custom drive) fits the subsea hardware
• Consider torque reaction forces — the ROV must be able to hold position while applying torque
• Always carry a backup torque tool or alternative interface on the tool skid
• Record all torque values applied in the dive log for client verification

Cutting Tools

• Diamond wire saws for cutting conductors, casings, and large-diameter tubulars
• Hydraulic shears for umbilicals, cables, and small-diameter pipes
• Abrasive disc cutters for flat plate and structural steel
• Guillotine cutters for rope, wire, and flexible hose
• Always confirm the material type and wall thickness before selecting a cutting method
• Factor in debris management — cutting operations generate material that can foul the ROV

Cleaning and Surface Preparation Tools

• Rotary brush tools for marine growth removal on structural members
• High-pressure waterjet systems for heavy fouling and paint removal
• Cavitation cleaning systems for precision surface preparation
• Suction dredging for sediment and debris removal
• Match the cleaning aggressiveness to the inspection requirement — over-cleaning can damage coatings

CP Probes and Survey Instruments

• Proximity CP probes for cathodic protection potential measurements
• Contact CP probes for direct anode and steel readings
• Wall thickness gauges (UTM) for corrosion monitoring
• Flooded member detection (FMD) sensors for structural integrity surveys
• Ensure probe calibration is current and documented before deployment

Tool Selection Decision Criteria

• Confirm the ROV class and payload capacity can support the tool weight and size
• Verify hydraulic and electrical interfaces are compatible
• Check that the tool has been function-tested on deck before deployment
• Review the operational depth rating against the planned working depth
• Ensure spare parts and backup tooling are available on the vessel
• Confirm the pilot has been trained or is experienced with the specific tool
• Document all tooling selections and serial numbers in the dive planning log

Logging Tool Usage

Every tool deployment should be recorded in the dive log with the tool type, serial number, task performed, and any issues encountered. ThrusterLog provides dedicated fields for tooling records, making it easy to maintain a complete history of tool usage across campaigns. This data is valuable for maintenance scheduling, client reporting, and competence tracking.