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Subsea & ROV Systems
ROV Equipment
ROV equipment covers the work class vehicles, surface control systems and launch and recovery gear that make up a remotely operated vehicle (ROV) spread on a drilling unit. On a floating rig the ROV watches the BOP and wellhead, runs torque tools and hot stabs, and gives you a second way to close the BOP. The three parts are engineered as one system, so a used purchase starts from what your spread already has.
How an ROV spread fits together
The vehicle does the work at the seabed. The surface control system sends power and commands down the umbilical and brings video, sonar and sensor data back. The launch and recovery system (LARS) lifts the vehicle and its tether management system (TMS) over the side or through the moonpool. The TMS rides down on the armoured umbilical, then pays out a neutrally buoyant tether so the vehicle flies clear of the umbilical's weight and the rig's heave.
Each part is sized to the next one in the chain:
- The vehicle and TMS weight in air sets the LARS safe working load (SWL).
- The vehicle's power demand sets the umbilical conductors and the control system transformers.
- The depth rating sets the umbilical length and the winch drum capacity.
- The vehicle's telemetry sets the fibre count and the surface multiplexer.
Change one item and the others need a fresh check against it.
How the sub-Categories differ
| Sub-Category | What it includes | First thing to check on a used unit |
|---|---|---|
| Work class ROVs | Hydraulic and electric vehicles with manipulators and tooling skids | Real depth rating of housings and foam, and auxiliary hydraulic output |
| ROV control systems | Pilot consoles, telemetry, vehicle power supply, control cabin | OEM support for the electronics generation and the software licence |
| ROV launch and support equipment | A-frames, LARS cranes, winches, umbilicals, TMS | Lifting certificates, last load test and umbilical condition |
Building a new spread, start from the vehicle and size everything outward. Replacing one part, start from the interface it must meet. A control system has to talk to the vehicle's subsea electronics pod. A LARS has to take the combined vehicle and TMS weight at the dynamic factor on its certificate.
The ROV's role in well control
On a floating drilling unit the ROV is part of the well control system, and some regulators say so in writing. In US federal waters, 30 CFR 250.734 requires an ROV and a trained ROV crew on the rig at all times. The ROV must be able to open and close each shear ram, the ram locks and one pipe ram within the response times in API Standard 53. The ROV panels on the BOP and lower marine riser package (LMRP) must comply with API RP 17H.
That rule shapes what a used vehicle must deliver. Check its auxiliary hydraulic flow, its intervention pump and its hot stabs against your BOP's closing volumes and panel receptacles before you settle on a spread.
Standards across the group
- IMCA R 004 is the industry guidance on safe and efficient ROV operations. It classes vehicles, with work class as Class III, and sets expectations for maintenance, records and crew competence.
- IMCA R 011, also numbered LR 011, covers initial and periodic examination, testing and certification of ROV LARS by a competent person.
- DNV-ST-0378, the DNV standard for offshore and platform lifting appliances, is a common certification basis for LARS. ABS, Lloyd's Register and other class societies have their own lifting appliance rules.
- API RP 17H, the API counterpart of ISO 13628-8, defines the ROV interfaces on subsea equipment such as torque tool buckets, hot stab receptacles and grab bars.
- NORSOK U-102 sets requirements for ROV services on the Norwegian continental shelf.
Sourcing a used spread
- Ask for planned maintenance records, dive logs and OEM service history for all three parts. A vehicle with full records on a LARS with no load test history is still an incomplete spread.
- Idle storage damages ROV gear. Compensators lose oil, elastomer seals take a set, foam stored wet absorbs water, and electronics in an unheated cabin corrode. A spread that worked steadily with good records is often the lower risk.
- Electronics obsolescence is usually the deciding cost on an older spread. Ask the OEM whether it still supports the serial numbers and the control software generation.
- Lifting certificates lapse when a LARS sits idle or moves to a new deck. Plan for a re-examination and load test after installation.
- A spread that matches vehicles you already run keeps pilot training, spares and tooling common.
Naventr can arrange an independent inspection of a spread on request and answer questions from the Seller's records.
FAQ
Frequently asked questions
What makes up a complete work class ROV spread?
A complete work class ROV spread is the vehicle, a tether management system, an armoured lift umbilical on its winch, a launch and recovery system, the surface control system with vehicle power supply, and a hydraulic power unit for the deck machinery. Most spreads add a workshop container and a spares pool. Confirm which items a sale includes before you compare two spreads.
Can I mix ROV equipment from different manufacturers?
You can mix launch equipment between makers, but the vehicle and its control system almost always need to come from the same OEM. Telemetry, subsea electronics and software are proprietary. A LARS, winch or TMS from another maker works if its SWL, umbilical size, sheave diameters and slip ring channels match the vehicle and umbilical.
Which standards apply to a used ROV spread?
IMCA R 004 covers ROV operations, maintenance and records, and IMCA R 011 covers examination, testing and certification of the LARS. The LARS is usually certified to DNV-ST-0378 or another class society's lifting rules. API RP 17H sets the subsea interfaces the vehicle's tools must fit, and NORSOK U-102 applies on the Norwegian shelf.
What does US regulation require of the ROV on a floating drilling rig?
In US federal waters, 30 CFR 250.734 requires an ROV and a trained ROV crew on the rig at all times. The ROV must be able to open and close each shear ram, the ram locks and one pipe ram within API Standard 53 response times. ROV panels on the BOP and LMRP must comply with API RP 17H.
Is an ROV spread that sat idle a better buy than one that kept working?
Not necessarily, because idle storage causes its own damage. Seals take a set, compensators lose oil, buoyancy foam absorbs water and cabin electronics corrode. A working spread with complete maintenance records often needs less work before it goes offshore than one parked for years without preservation.
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