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Subsea & ROV Systems
Subsea Equipment
Subsea equipment covers hardware installed on or run to subsea trees, manifolds and structures, apart from the BOP stack itself. The group includes subsea control modules, the connectors that join power, signal, hydraulic and flow lines underwater, and the tooling an ROV carries to operate them. Nearly all of it is built to one OEM's interface, so the part number and revision matter more than the description.
What the group covers
| Sub-Category | Where it sits | Main fit question |
|---|---|---|
| Subsea control modules | On a tree or manifold mounting base | Does it match the field's control system, fluid and SEM generation? |
| Subsea connectors | Between flying leads, modules, jumpers and hubs | Does it mate with the half already installed? |
| Subsea tools and intervention | On the ROV or its tooling skid | Does the vehicle drive it, and does it fit the API RP 17H interface? |
The connectors that join a BOP to the wellhead are covered in wellhead connectors.
Installed hardware against tooling
Control modules and connectors stay on the seabed. They must fit an interface someone else designed years ago, so you match part number, revision and field architecture first and condition second. A connector that is perfect but one revision off may not mate.
Tooling travels with the ROV. It must match the vehicle's auxiliary hydraulic supply and the interface class on the hardware it operates. Most torque buckets and hot stab receptacles follow API RP 17H, so tooling from different makers is more interchangeable than installed hardware.
Standards across the group
| Document | Subject | What it means for a used unit |
|---|---|---|
| API 17A / ISO 13628-1 | General requirements for subsea production systems | Sets the documentation and design framework the rest refer to |
| API 17D / ISO 13628-4 | Subsea wellhead and tree equipment | Governs the tree hardware that modules and connectors attach to |
| API 17F / ISO 13628-6 | Subsea production control systems | Covers SCMs and connector qualification. ISO 13628-6:2006 put rework and repair of used equipment outside its scope |
| API RP 17H / ISO 13628-8 | ROV interfaces on subsea equipment | Torque classes, buckets and hot stab receptacles |
| API RP 17R | Flowline connectors and jumpers | Design and test requirements for tie-in connectors |
| API RP 17Q | Subsea equipment qualification | A framework for showing hardware meets its duty |
Because the design standards do not define how to requalify used hardware, agree that route with the field owner and the OEM before you buy.
What decides value on used subsea hardware
- Traceability. Ask for the factory acceptance test (FAT) record, the as-built data book, material certificates, and the OEM part number and revision.
- Storage. Ask whether the OEM's preservation procedure was followed, including fluid fill, protective caps and indoor or climate-controlled storage. Seals and accumulators age even on a shelf.
- Service history. For recovered hardware, ask for the recovery report, the reason it came up and any post-recovery inspection. Plan on new seals before it goes back down.
- Obsolescence. Subsea electronics modules age out faster than the hydraulics. Check that the OEM still supports that generation.
Integration across the group
- Control fluid. Water-based and oil-based fluids need different seals and filters. Couplers, modules and the umbilical must all suit the same fluid.
- Cleanliness. The hydraulic chain is only as clean as its dirtiest part. A recovered coupler can contaminate a new module.
- Instrument interfaces. Newer fields use the SIIS levels for sensor communication, while older ones use OEM-specific protocols.
- ROV access. Installation and recovery tooling must reach the hardware and fit its interface class.
- Depth and pressure. Check each item's rated water depth and working pressure against the field, not against the project it came from.
Choosing between new, unused surplus and used
Unused surplus hardware left over from a field development is the strongest option when its part number matches your field. It has passed FAT and never seen seawater, so the main question is how it was preserved. Recovered hardware costs less but needs a refurbishment and a repeat of the factory tests before it goes back down. New hardware from the OEM is the fallback when nothing surplus matches, and older SEM generations may no longer be built at all.
Naventr can arrange an independent inspection on request and pass your technical questions to the Seller, who holds the data books.
FAQ
Frequently asked questions
What documents should come with used subsea equipment?
Used subsea equipment should come with its FAT record, as-built data book, material certificates and the OEM part number and revision. If it has been installed, ask for the installation and recovery reports and any post-recovery inspection. Unused hardware needs its storage and preservation records.
Which API and ISO standards cover subsea equipment?
The main documents are API 17A for subsea production systems, API 17D for wellheads and trees, API 17F for control systems, API RP 17H for ROV interfaces and API RP 17R for flowline connectors and jumpers. API 17A, 17D, 17F and 17H correspond to parts 1, 4, 6 and 8 of ISO 13628.
Can recovered subsea equipment go back into service?
Recovered subsea equipment can often go back into service after inspection, new seals and a repeat of the factory tests, usually by the OEM or an approved shop. ISO 13628-6 put rework of used control equipment outside its scope, so agree the requalification route with the field owner before you buy.
Does subsea equipment from one OEM fit another OEM's system?
Installed subsea hardware from one OEM rarely fits another OEM's system. Mounting bases, couplers, connector series and communication protocols are proprietary. ROV tooling is the exception, because API RP 17H standardises the torque buckets and hot stab receptacles it engages.
How should unused subsea equipment be stored?
Unused subsea equipment should be stored to the OEM's preservation procedure, usually indoors or in climate-controlled containers. Hydraulic circuits stay filled with the right fluid and connectors stay capped. Periodic checks are logged. Without those records, expect to retest before installation.
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