SFI Group System v7.12 — Extension Appendices

Open Classification Extensions
for Modern Ships

These appendices extend the official SFI Group System with new codes for offshore, emission-reduction, dredging and subsea systems. No existing codes are overwritten. Use the ▼ Comment button under any section to leave specific feedback, or Leave Overall Feedback for general remarks.

v7.12 base — unassigned code space only APP-V1-001 & APP-V1-002 integrated Public consultation open

Document

DocumentAPP-V1-001

Version2026 r3 — Consolidated Edition

Status• Integrated

BaseSFI Group System v7.12

Date issued1 January 2026

ConsultationOpen

Description

This appendix extends the official SFI Group System (v7.12) across four operational domains:

Emission reduction and energy efficiency — MARPOL Annex VI (NOx, SOx), IMO EEXI and CII, EU ETS and FuelEU Maritime.
Alternative and low-emission fuels — methanol, ammonia, hydrogen and LNG fuel gas supply systems.
Cable laying and specialised cargo handling — cable lay vessels and heavy lift offshore operations.
Ballast water treatment and underwater vehicles — BWTS compliance systems and ROV operations.

No existing official SFI codes are overwritten. All extensions occupy confirmed unassigned code space.

328Cable Handling & Laying SystemsNew subgroup

Complete cable handling chain from carousel storage through tensioning to overboard deployment and seabed ploughing.

All codes are new additions — no official codes exist in range 328xxx.

Code	Name	Description
328010	Cable Laying System	Complete overboard cable laying arrangement
328020	Cable Tensioner System	Linear cable tensioner with drive and control
328030	Cable Carousel	Rotating cable storage carousel, complete
328035	Cable Carousel Gearbox	Reduction gearbox for carousel drive
328040	Cable Carousel Motors	Electric or hydraulic drive motors for carousel
328042	Cable Carousel Controls	Automation and HMI for carousel operation
328050	Cable Plough System	Seabed cable plough for burial, complete
328052	Cable Plough Drive Units	Drive units for plough traction and steering
328055	Cable Plough Controls	Automation and HMI for plough operation

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454Heavy Lift Jacking SystemsNew subgroup

Vessel-integrated jacking systems for offshore heavy lift, load-out and jack-up leg operations.

Code	Name	Description
454001	Jacking System, Complete	Vessel-integrated jacking system, all types
454045	Jacking System Hydraulic Oil System	Complete dedicated HPU for jacking system
454047	Hydraulic Oil Pumps with Drive Unit	Supply pumps for jacking hydraulic circuit
454049	Hydraulic Oil Preheaters	Preheaters for jacking hydraulic oil
454051	Hydraulic Oil Coolers	Coolers for jacking hydraulic oil
454053	Hydraulic Oil Filters	Filters for jacking hydraulic oil
454055	Hydraulic Oil Expansion Tanks	Expansion tanks for jacking hydraulic circuit
454057	Hydraulic Oil Storage Tanks	Storage tanks for jacking hydraulic oil
454060	Jacking System Jetting Pump	High-pressure jetting pump for spud can penetration
454070	Jacking System Legs with Spud Can	Structural jack-up legs with spud can foundations

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601Dual-Fuel & EEXI Extension601800–601900

Engine-mounted fuel gas and pilot fuel systems on dual-fuel main engines. Official range: 601000–601200. New codes from 601800.

Code	Name	Description
601800	ME Fuel Gas System	Engine-mounted fuel gas system for dual-fuel main engine
601810	ME Fuel Gas Injection Valve	Gas admission valves mounted on main engine
601820	ME Pilot Fuel System	Engine-mounted pilot fuel system for dual-fuel ignition
601830	ME Pilot Fuel Injection Valve	Pilot fuel injection valves mounted on main engine
601900	EPL — Engine Power Limitation Unit	Electronic or mechanical power limitation device for EEXI compliance

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634Shaft Power Limitation (EEXI)634900

Official SFI 634 covers CPP plants. Code 634900 is numerically free and covers shaft power limitation for EEXI compliance.

Code	Name	Description
634900	SHaPoLi — Shaft Power Limitation System	Shaft power monitoring and limitation device for EEXI compliance

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646WHR Steam Extension646100

WHR steam generators whose primary purpose is energy efficiency improvement. Official range: 646001–646039.

Code	Name	Description
646100	WHR Exhaust Boiler (HRSG)	Heat recovery steam generator from exhaust gas, primarily for energy efficiency improvement

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668Waste Heat Power Recovery SystemsNew subgroup

Systems that convert waste heat from exhaust gases directly into electrical power.

Code	Name	Description
668001	WHR Power Turbine Unit	Power turbine for electrical power generation from exhaust gas flow
668010	ORC Energy Recovery Module	Organic Rankine Cycle module for heat-to-power conversion
668020	WHR Power System Control Unit	Automation and control package for WHR power recovery systems

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707Gas Fuel & Low-Emission Fuels ExtensionBlocks A & B

Block A (707001–707034): LNG FGSS. Block B (707100–707310): methanol, ammonia and hydrogen alternative fuels.

Code	Name	Description
707001	Fuel Gas Supply System (FGSS), Complete	Complete LNG fuel gas supply system
707005	FGSS BOG Compressors	Boil-off gas compressors for fuel gas conditioning
707008	FGSS BOG Oil Pumps	Oil pumps serving BOG compressor lubrication
707015	FGSS Valve Remote Control System	Remote control system for FGSS valves
707021	FGSS Glycol System	Glycol heating/cooling system for FGSS conditioning
707022	FGSS Water Glycol Pumps	Circulation pumps for FGSS glycol system
707027	FGSS LNG Fuel Pumps	Cryogenic pumps for LNG fuel supply
707034	FGSS LNG Safety Valves	Safety and pressure relief valves for LNG fuel system
707100	Methanol Fuel Supply System	Pump, filtration, valves and double-walled piping skid
707110	Methanol Purge & Ventilation System	Safety ventilation, purge lines and gas detection
707200	Ammonia Fuel Conditioning System	NH3 conditioning skid, cryogenic pumps and evaporators
707210	Ammonia Safety & Detection Network	Toxicity detection and emergency neutralisation systems
707300	Hydrogen Fuel Cell Module	Fuel cells, inverters and auxiliary systems
707310	Hydrogen Storage & Conditioning	Tanks, vaporisers, valves and dedicated piping

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735Air Lubrication SystemsNew subgroup

Micro-bubble air lubrication systems that reduce hull friction.

Code	Name	Description
735001	Air Lubrication Compressors	Dedicated compressors for micro-bubble air supply
735005	Air Distribution Manifold	Distribution manifold and control valves for underhull air supply
735010	Underhull Micro-Bubble Plates	Hull-mounted air injection plates and diffusers
735020	Air Lubrication Control System	Automation and monitoring package for air lubrication system

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746Exhaust Gas Treatment SystemsNew subgroup

SCR, EGR and EGCS/scrubbers for NOx and SOx reduction.

Code	Name	Description
746001	SCR Reactor Units	Catalytic reactors for NOx Tier III reduction with catalyst modules
746005	SCR Urea/Ammonia Injection Module	Injection skid with pumps, valves and control system
746010	EGR Blower & Cooler Assembly	Blower and cooler assembly for exhaust gas recirculation loop
746015	EGR Recirculation Valves & Piping	Piping, valves and sensors for EGR recirculation
746020	EGCS Scrubber Tower	Gas cleaning column (open, closed or hybrid loop)
746025	EGCS Washwater System	Pumps, filters, sensors and washwater handling system
746030	EGCS Monitoring & Control Cabinet	PLC unit, analysers and operator console

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747Maritime Carbon Capture SystemsNew subgroup

Onboard capture, compression, liquefaction and storage of CO2 from exhaust gases.

Code	Name	Description
747001	CO2 Absorber Tower	Absorber column (MEA or equivalent solvent process)
747010	CO2 Compressor & Liquefier	CO2 compression and liquefaction unit
747020	CO2 Storage Tanks	Integrated cryogenic CO2 storage tanks
747030	CO2 Offloading System	CO2 offloading arrangement for shore transfer

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799Emission & Energy Monitoring SystemsNew subgroup

Real-time monitoring of energy efficiency and emissions supporting EEXI, CII, EU ETS and MARPOL Annex VI compliance.

Code	Name	Description
799001	EEMS — Energy Efficiency Monitoring System	Monitoring of EEXI/CII parameters, shaft loads, SFOC and fuel usage
799010	CEMS — Continuous Emission Monitoring System	Continuous NOx, SOx and CO2 monitoring on stack
799020	Mass Flow Fuel Metering (MFM)	Certified mass flow meters for fuel consumption measurement
799030	Carbon Capture Monitoring System	Monitoring of carbon capture plant and CO2 storage tanks

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801Ballast Water Treatment System — BWTS801070–801080

BWM Convention compliance systems. Official range: 801001–801061. New codes start at 801070.

Code	Name	Description
801070	BWTS, Complete	Complete BWTS for BWM Convention compliance
801071	BWTS Auto Neutralising Unit	Automatic neutralisation unit for treated ballast water
801072	BWTS Conductivity Sensor Unit	Conductivity sensors for salinity and treatment monitoring
801073	BWTS Flow Meter Unit	Flow measurement unit for ballast water treatment
801074	BWTS Electro Chamber Unit	Electrochlorination or UV chamber for biological treatment
801075	BWTS TRO Sensor Unit	Total residual oxidant sensor for discharge compliance
801076	BWTS Filters	Filtration units for BWTS intake screening
801077	BWTS Backflushing Pump	Backflush pump for filter cleaning cycle
801078	BWTS Circulating Pump	Circulation pump for treatment loop
801079	BWTS Metering Pump	Chemical metering pump for dosing systems
801080	BWTS Control System	PLC and HMI control system for BWTS operation

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868 / 875Shore Power — OPS / HVSCExtension

High-voltage shore connection and OPS switchboard integration.

Code	Name	Description
868001	Shore Connections	Shore connection sockets and couplings (existing SFI code — unchanged)
868100	Shore Power HVSC Panel	High-voltage shore connection panel with interlocks and monitoring
868110	Frequency Converter	Converter unit for shore-to-vessel frequency and voltage adaptation
875900	OPS Switchboard Integration Panel	Vessel-side switchboard panel for integration of onshore power supply

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901Remote Operated Vehicle — ROVPrimary Group 9

Primary Group 9 is reserved by SFI for user-defined classifications. Subgroup 901 covers the ROV as a system and all equipment integrated into or permanently attached to the ROV itself.

Code	Name	Description
901001	ROV Propulsion System	Thrusters and propulsion units integrated in ROV
901003	ROV Jetting Pumps	High-pressure jetting pumps for ROV excavation tasks
901004	ROV Hydraulic System	Onboard hydraulic power unit and circuit for ROV manipulators
901006	ROV Electrical System	Onboard electrical distribution, power conversion and wiring
901008	ROV Tooling & Intervention Package	Manipulators, tooling skids and intervention equipment
901009	ROV Sensors & Surveillance	Cameras, sonars, depth sensors and survey instrumentation
901013	ROV Tether & Umbilical	ROV-side umbilical termination, tether and connectors
901014	ROV Cables	Internal and external cables specific to ROV system
901021	ROV Ballast & Trim System	Variable buoyancy, ballast weights and trim system
901022	ROV Navigation & Control System	Navigation computer, autopilot and pilot control station
901025	ROV LARS Interface	ROV-integrated LARS components: TMS, tether termination and latch mechanisms

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DocumentAPP-V1-002

VersionAmended r3 — Revised Codes

Status• Integrated

BaseSFI Group System v7.12

Supersedesr2 — all conflicts resolved

ConsultationOpen

Description

This appendix extends the official SFI Group System (v7.12) for dredging and offshore construction vessels.

Dredging — TSHD, CSD and Backhoe Dredger plant, from seabed engagement through slurry transport to material discharge.
Offshore lifting and deck operations — A-frames, active heave-compensated winches, skid and rail systems.
Subsea intervention and offshore construction — LARS, subsea power and control, offshore construction tooling.

482Dredging EquipmentOfficial subgroup — codes populated

Covers all vessel-side dredging plant across TSHD, CSD and Backhoe Dredgers.

Code	Name	Description
482000	Dredging Plant, Complete	Complete dredging plant as delivered, all types
482001	TSHD Dredging Plant	Complete trailing suction hopper dredger plant
482002	CSD Dredging Plant	Complete cutter suction dredger plant
482003	Backhoe Dredger Plant	Complete backhoe/grab dredger plant
482010	Draghead Assembly, Complete	Complete draghead with visor and wear parts for seabed engagement
482011	Draghead Visor	Articulated visor with actuators and wear shoes
482012	Draghead Water Jets	Internal jet nozzles and bars for material loosening
482013	Draghead Wear Parts	Lips, teeth, wear plates and sacrificial components
482014	Suction Mouth / Inlet Screen	Inlet screening and protection for the suction mouth
482020	Suction Pipe System, Complete	Full suction pipe arrangement from draghead to pump
482021	Lower Suction Pipe	Lower (submerged) section of suction pipe with wear lining
482022	Upper Suction Pipe	Upper (inboard) section of suction pipe
482023	Suction Pipe Joints & Couplings	Flexible ball joints, rubber compensators and couplings
482024	Suction Pipe Wear Lining	Rubber or ceramic wear lining inside suction pipes
482050	Dredge Pump, Complete	Main centrifugal slurry pump for dredged material transport
482051	Submerged Dredge Pump	Submersible pump mounted on suction pipe or draghead
482052	Dredge Pump Drive Unit	Electric motor or gearbox driving the dredge pump
482053	Dredge Pump Wear Parts	Impellers, wear rings, liners and sacrificial components
482054	Booster Pump, Dredging	Intermediate booster pump for long-distance slurry transport
482055	Dredge Pump Shaft Seal System	Gland sealing and flushing system for pump shafts
482070	Cutter Head Assembly, Complete	Full cutter head with cutting teeth and wear protection
482071	Cutter Head Drive Unit	Electric or hydraulic motor driving the cutter head
482072	Cutter Teeth & Wear Parts	Cutting picks, teeth and sacrificial wear elements
482073	Cutter Ladder Assembly	Structural ladder carrying suction pipe and cutter head
482074	Cutter Ladder Lifting System	Winches and wires for raising and lowering the cutter ladder
482075	Spud Carriage System	Spud poles, carriage and stepping mechanism for CSD positioning
482076	Anchor & Swing Wire System	Side anchor wires, winches and fairleads for CSD swing dredging
482080	Hopper System, Complete	Full hopper arrangement including doors, overflow and instrumentation
482081	Hopper Bottom Doors	Mechanical or hydraulic bottom discharge doors
482082	Hopper Door Hydraulic System	Hydraulic actuators, control valves and HPU for door operation
482083	Overflow System	Adjustable or air-controlled overflow units for water discharge during filling
482084	Overflow Control Valves	Valves and actuators for overflow level management
482085	Hopper Wear Lining	Rubber or steel wear protection on hopper walls and bottom
482086	Hopper Washing System	Fixed nozzles and pumps for hopper cleaning after discharge
482090	Dredging Monitoring System, Complete	Integrated system for production measurement and process monitoring
482091	Draghead Depth & Inclination Sensors	Sensors monitoring draghead depth, angle and position
482092	Slurry Density Meters	Nuclear or acoustic density measurement in suction/discharge pipe
482093	Flow Velocity Meters	Electromagnetic or ultrasonic flow meters in slurry lines
482094	Hopper Level & Density Instrumentation	Level gauges, draft sensors and in-hopper density probes
482095	Production Monitoring & DREDGEPACK System	HMI, data logging and production calculation software
482096	Dredging Control Consoles	Operator consoles and control panels for dredging operations
482097	DGPS & Positioning System for Dredging	Differential GPS and vessel positioning for dredge track control

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972A-Frame SystemsNew — PG9

A-frames are the primary deployment structures on offshore construction and subsea support vessels.

Code	Name	Description
972.000	A-Frame System, Complete	Over-stern A-frame for subsea deployment, complete
972.010	A-Frame Structure	Structural steel A-frame body and pivot arrangement
972.020	A-Frame Hydraulic Cylinders	Cylinders for A-frame raising and lowering
972.030	A-Frame Hydraulic Power Unit	HPU dedicated to A-frame operation
972.040	A-Frame Control Manifolds	Valve manifolds and control blocks
972.050	A-Frame Load Cells	Load monitoring instrumentation
972.060	A-Frame Position Sensors	Angular and position instrumentation
972.070	A-Frame Monitoring System	HMI and automation package for A-frame operations

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973Offshore Special Lifting WinchesNew — PG9

Active heave-compensated (AHC) and deep-water winches for offshore construction.

Code	Name	Description
973.000	Offshore Lifting Winch, Complete	Complete offshore lifting winch, all types
973.010	AHC Winch	Active heave-compensated winch with control system
973.020	Deepwater Winch	Winch rated for deep-water subsea operations
973.030	Winch Drive Unit	Electric or hydraulic drive for offshore winches
973.040	Winch Brake System	Mechanical and hydraulic braking arrangement
973.050	Winch Wire & Spooling System	Wire rope, spooling gear and level wind arrangement
973.060	Winch Load & Pay-out Instrumentation	Tension, pay-out and speed measurement
973.070	Winch Control & HMI System	Automation package and operator interface

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974Deck Handling SystemsNew — PG9

Deck systems supporting manipulation and transfer of heavy subsea tools.

Code	Name	Description
974.000	Deck Handling System, Complete	Complete deck handling arrangement for subsea tools
974.010	Skid Beam & Rail System	Guide rails and skid beams for tool positioning on deck
974.020	Tool Deployment Frame	Structural skids and support frames for subsea tools
974.030	Deck Transfer Cart	Hydraulic or motorised transfer cart
974.040	Hydraulic Deck Mover	Hydraulic pushing and pulling units for deck transfer
974.050	Deck Handling Control System	HMI and automation for deck handling operations

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990Launch & Recovery Systems — LARSNew — PG9

Vessel-side LARS infrastructure. ROV-integrated LARS components are classified under 901025 (APP-V1-001).

Code	Name	Description
990.000	LARS System, Complete	Complete launch and recovery system for ROV or subsea tools
990.010	A-Frame LARS	A-frame based launch and recovery system
990.020	Moonpool LARS	Moonpool-based deployment system
990.030	TMS Handling System	Tether management system deployment arrangement
990.040	Guidewire & Cursor System	Subsea guiding and positioning tools
990.050	LARS Control System	HMI and automation for launch and recovery operations

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991Subsea Power & ControlNew — PG9

Power distribution and control systems for umbilicals and subsea tools.

Code	Name	Description
991.000	Subsea Control System, Complete	Complete power and control arrangement for subsea operations
991.010	Subsea Control Unit (SCU)	Topside power and control unit for subsea tools
991.020	Umbilical Reel	Storage and deployment reel for umbilical cables
991.030	Umbilical Tensioner	Active tensioner for umbilical management
991.040	Umbilical Sheaves & Guides	Sheaves, fairleads and guiding arrangements
991.050	Subsea Power Distribution Unit	Subsea-rated power distribution module
991.060	Fibre Optic Communication System	Topside-to-subsea fibre optic link and terminations

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992Offshore Construction ToolingNew — PG9

Specialised tools deployed from the vessel to carry out physical work on the seabed or on subsea structures.

Code	Name	Description
992.000	Offshore Construction Tooling, Complete	Complete tooling package for offshore seabed operations
992.010	Hydraulic Cutting Tools	Subsea saws and shears for seabed and structural work
992.020	Grabs & Clamshell Buckets	Excavation and lifting tools for seabed material
992.030	Trenching Tool System	Mechanical and jet trencher systems
992.040	Rock Dumping Equipment	Rock placement and dumping tools and chutes
992.050	Mattress Deployment System	Concrete mattress handling and deployment equipment
992.060	Subsea Tool Control System	HMI and hydraulic control package for construction tooling

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Scope Boundary — APP-V1-002 vs APP-V1-001

Topic	APP-V1-002 (this document)	APP-V1-001
Vessel-side LARS (A-frame, winch, guidewires)	PG9 990	—
ROV system and ROV-integrated LARS	Cross-ref only	PG9 901, 901025
Subsea umbilical and power/control	PG9 991	—
Seabed construction and trenching tools	PG9 992	Cross-ref to 328
Cable laying and carousel systems	Cross-ref only	328
Jacking systems (jack-up legs, load-out)	Cross-ref only	454
Deck handling of subsea tools	PG9 974	Cross-ref to 454
Ballast water treatment	Cross-ref only	801070–801080
Fuel gas supply (LNG/FGSS)	Cross-ref only	707001–707034

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