SOLAS Chapter XV: Industrial Personnel

Background

The regulatory gap

For decades, SOLAS divided ships into a small number of categories: passenger ships (carrying more than 12 passengers), cargo ships (everything else of 500 GT and above), and various specialised types (tankers, gas carriers, bulk carriers, etc.). The passenger / non-passenger threshold was simple: 12 passengers triggered the full passenger ship regulatory regime including Chapter III life-saving appliance capacity for all persons, evacuation analysis, Chapter II-2 sprinkler and detection in accommodation, and the rest.

The growth of offshore industries from the 2000s onward, particularly offshore wind, exposed a gap in this framework. Offshore wind farms require:

• Daily transfers of technicians from shore to wind turbines and between turbines.
• Multi-day stays of specialist crews on Service Operation Vessels (SOVs) parked among the wind turbines.
• Heavy-lift commissioning with multiple specialist crews aboard Commissioning Service Operation Vessels (CSOVs).
• Decommissioning at end-of-life with multiple specialist crews involved in dismantling.

The persons being transported in these scenarios were neither passengers (they were industrial specialists with substantial offshore experience and training) nor crew (they did not operate the ship). Treating them as passengers would trigger the full passenger ship regulations, which would make many service vessel designs uneconomic. Treating them as crew (limited to typically 12 persons) was inconsistent with the actual operational pattern.

The industry had developed practical workarounds (typically operating the vessels with 12 or fewer industrial personnel at a time, or operating under flag-state-specific Special Purpose Ship rules), but these were neither uniform nor comprehensive.

IMO development of Chapter XV

In 2018, the IMO Maritime Safety Committee (MSC) initiated development of a new SOLAS chapter to address industrial personnel. The work involved:

• Industry consultation with offshore wind operators, vessel operators, classification societies and seafarer unions.
• Adaptation of existing SOLAS provisions to the industrial-personnel operational pattern.
• Development of the supporting IP Code providing the engineering detail.
• Coordination with related instruments including the STCW Convention, the MLC 2006, the ISM Code, and the HSC Code.

The chapter and the IP Code were adopted by Resolution MSC.521(106) and Resolution MSC.527(106) in November 2022, with entry into force on 1 July 2024.

Comparison with other ship-type-specific provisions

Chapter XV is one of several ship-type-specific chapters of SOLAS:

• Chapter X governs high-speed craft.
• Chapter XII governs bulk carrier additional safety measures.
• Chapter XIV governs polar operations.
• Chapter XV governs ships carrying industrial personnel.

Each ship-type-specific chapter adapts the general SOLAS regime to the unique characteristics of the ship type, providing a tailored regulatory framework while drawing on the shared safety architecture.

Major regulatory milestones

• 2018: IMO MSC initiates development of a new chapter for industrial personnel.
• 2020-2022: Detailed development of the chapter and IP Code, with industry consultation and technical drafting.
• November 2022: Chapter XV adopted (Resolution MSC.521(106)) and IP Code adopted (Resolution MSC.527(106)).
• 1 July 2024: Chapter XV and IP Code entered into force.
• 2024-2026: First wave of ships certificated under the new framework, primarily in European wind farm operations.

Application (Regulation 1)

Scope of application

Chapter XV applies to ships carrying more than 12 industrial personnel on international voyages. The threshold is the same as the passenger ship threshold (more than 12 passengers triggers passenger ship status), recognising that the regulatory burden should kick in above the same operational scale as for passengers.

Specifically excluded from Chapter XV (with full or partial alternative regulatory regimes):

• Vessels with 12 or fewer industrial personnel: covered by general SOLAS cargo ship requirements.
• Vessels carrying mixed passengers and industrial personnel: typically treated as passenger ships if the passenger count exceeds the limit.
• Government vessels on non-commercial service.
• Vessels engaged solely on domestic voyages: covered by national legislation that may or may not adopt Chapter XV.

The “international voyage” criterion is the same as elsewhere in SOLAS: a voyage that crosses an international maritime boundary or visits a foreign port.

Categories of vessels in scope

Vessels typically covered by Chapter XV include:

• Service Operation Vessels (SOVs) for offshore wind: ships of typically 80 to 90 metres LOA accommodating 30 to 60 industrial personnel for multi-day operations among wind turbines.
• Commissioning Service Operation Vessels (CSOVs): similar but with greater accommodation and specialist commissioning equipment.
• Walk-to-Work (W2W) vessels: vessels with active motion-compensated gangways for direct transfer to wind turbines.
• Larger Crew Transfer Vessels (CTVs): typically 20 to 30 metre catamarans carrying 12 industrial personnel and crew, but the larger CTVs above 12 industrial personnel fall in the chapter scope.
• Aquaculture support vessels: serving fish farms with daily personnel transfers.
• Decommissioning vessels: serving end-of-life offshore platform dismantling.
• Specialist offshore construction vessels at sites with continuous specialist crew presence.

Definitions (Regulation 2)

Industrial personnel

The defining concept is industrial personnel: persons of any age and sex carried on board a vessel for the purpose of conducting industrial activities at a remote site, who:

• Are not employed in any capacity on board (i.e. not crew of the carrying ship).
• Are not passengers in the conventional sense (not carried for tourism, business meeting attendance, or personal travel).
• Are trained for survival at sea to defined competence levels.
• Will be conducting industrial work at the destination.

The definition covers wind turbine technicians, oil and gas platform specialists, aquaculture workers, decommissioning specialists, marine survey specialists, and similar.

Industrial activities

The chapter does not exhaustively list industrial activities but provides examples covering:

• Offshore renewable energy: wind farm installation, operation and maintenance.
• Oil and gas: platform installation, operation, maintenance and decommissioning.
• Aquaculture: fish farm operation and maintenance.
• Subsea infrastructure: cable installation, ROV operation, subsea structure inspection.
• Decommissioning: dismantling of offshore platforms.

The list is illustrative; new industrial activities may be added through future amendments.

Other definitions

The chapter and IP Code define numerous technical terms:

• Personal Survival Suit: an immersion suit appropriate to the operating area’s water temperature.
• Personal LSA equipment: lifejacket, immersion suit, thermal protective aid, signalling whistle, light.
• Survival at sea training: training to defined competence in self-help and rescue actions in the marine environment, typically meeting industry-standard requirements such as the GWO (Global Wind Organisation) BOSIET (Basic Offshore Safety Induction and Emergency Training) certificate or equivalent.

Carrying requirements (Regulation 3)

Reference to the IP Code

Regulation 3 specifies that ships carrying more than 12 industrial personnel must comply with the IP Code. The IP Code is structured to provide the detailed safety requirements that the regulation enforces, much as the LSA Code supports Chapter III and the IMDG Code supports Chapter VII.

IP Code structure

The IP Code is structured into 18 Chapters covering:

• Chapter 1: General provisions.
• Chapter 2: General requirements (basic safety performance).
• Chapter 3: Buoyancy, stability and subdivision.
• Chapter 4: Machinery installations.
• Chapter 5: Electrical installations.
• Chapter 6: Periodically unattended machinery spaces.
• Chapter 7: Auxiliary systems.
• Chapter 8: Fire safety.
• Chapter 9: Life-saving appliances.
• Chapter 10: Safety of navigation.
• Chapter 11: Radiocommunications.
• Chapter 12: Carriage of dangerous goods (where applicable).
• Chapter 13: Personnel transfer.
• Chapter 14: Personnel survival training.
• Chapter 15: Operations.
• Chapter 16: Maintenance, inspection and survey.
• Chapter 17: Personnel safety equipment.
• Chapter 18: Personal protection.

Adaptation of safety provisions

The IP Code combines:

• Cargo ship-derived provisions for structure, machinery and electrical (Chapters 3 to 7), suitable for vessels in the size range typically operating with industrial personnel (60 to 100 m LOA).
• Adapted passenger ship provisions for life-saving appliances (Chapter 9), with personal LSA for each industrial personnel and embarkation arrangements suitable for the typical complement.
• Cargo ship-equivalent fire safety (Chapter 8) but with attention to the larger personnel complement than a typical cargo ship.
• Cargo ship navigation requirements (Chapter 10) typically aligned with Chapter V Regulation 19.
• GMDSS provisions appropriate to coastal and short-sea operation.

Personnel transfer

Chapter 13 of the IP Code addresses the unique aspect of industrial-personnel ships: transfer of personnel between the vessel and the offshore installation. The transfer is typically by:

• Walk-to-Work (W2W) gangway: an active motion-compensated gangway extending from the vessel to the wind turbine or platform, allowing personnel to walk across with hands free.
• Personnel transfer basket: a basket deployed by the offshore installation’s crane, with personnel inside, lowered to the vessel’s deck.
• Crew Transfer Vessel approach: small CTVs make a dynamic-pushing approach to the wind turbine, with personnel stepping off the vessel’s bow onto the turbine’s transition platform.
• Helicopter transfer: where the offshore installation has a helideck.

The IP Code Chapter 13 specifies design and operational requirements for each transfer method, with particular attention to motion-compensation specifications for W2W gangways.

Personnel survival training

Chapter 14 of the IP Code requires that all industrial personnel hold valid survival-at-sea training, typically:

• GWO BOSIET (Basic Offshore Safety Induction and Emergency Training): the wind industry’s baseline offshore survival training, including sea survival, fire fighting, first aid, and helicopter underwater escape training.
• Equivalent oil and gas industry training: BOSIET or industry-equivalent for oil and gas personnel.
• Aquaculture-specific training: developed for the fish farm sector.

The training requirements are documented in each industrial personnel’s competence record and verified before boarding.

Comparison with other regulatory regimes

Versus passenger ship regime

Industrial-personnel ships under Chapter XV differ from passenger ships in several ways:

• Persons on board are professionally trained for offshore survival, unlike passengers who may have no training.
• Voyages are typically short (1 to 8 hours each way to the wind farm or platform), unlike passenger ship voyages which may be days or weeks.
• The destination has its own emergency response infrastructure (the offshore installation’s evacuation, helicopter access, dedicated rescue resources), reducing the LSA self-sufficiency burden on the carrying vessel.
• Personnel are typically limited to defined working-age adults with documented medical fitness, unlike the broader demographic on passenger ships.

These differences justify the somewhat lighter LSA and emergency-response burden under the IP Code compared with full passenger ship regulation.

Versus high-speed craft regime

Industrial-personnel ships also differ from HSC:

• Speed: industrial-personnel ships typically operate at 12 to 18 knots, well below the HSC threshold.
• Service profile: industrial-personnel ships typically operate as multi-day SOVs or daily CTVs, different from the high-frequency point-to-point HSC service.
• Stability and structure: industrial-personnel vessels are typically conventional displacement hulls, not the multi-hull or air-cushion hulls of HSC.

Chapter XV and Chapter X are distinct regulatory frameworks that do not overlap.

Versus offshore supply vessel (OSV) regime

The IP Code consolidates and supersedes some of the previous OSV-specific guidance from the IMO MODU Code, MOU Code, and the SPS Code (Special Purpose Ships Code). However:

• The MODU Code continues to apply to mobile offshore drilling units engaged in drilling and well operations.
• The OSV Code continues to apply to traditional supply vessels primarily moving cargo to and from offshore installations.
• The SPS Code continues to apply to ships with special-purpose missions outside the IP Code scope.

Chapter XV occupies the intermediate space of vessels primarily transporting industrial personnel.

Industry context

Offshore wind growth

Offshore wind has grown substantially since 2010:

• 2010: approximately 3 GW of offshore wind globally, mostly in Europe (UK, Denmark, Germany, Netherlands).
• 2020: approximately 35 GW globally, with continued European leadership and rapid Chinese expansion.
• 2025: approximately 80 GW globally with significant US, Taiwan, Japan and Korea additions.
• 2030 (projected): 250 to 350 GW depending on policy.

The fleet of vessels supporting offshore wind has grown proportionally, with approximately 200 SOVs and CSOVs in operation by 2026 and several hundred CTVs.

Major operators and shipbuilders

The principal SOV/CSOV operators include:

• Esvagt (Denmark): pioneering operator with one of the largest fleets.
• North Star Shipping (UK): UK fleet serving British wind farms.
• Edda Wind (Norway): part of the Wilhelmsen group.
• MMA Offshore (Australia, but with global operations).
• DOF Subsea (Norway, also active in subsea construction).

Major shipbuilders for industrial-personnel vessels include:

• Damen (Netherlands): broad portfolio across SOV, CSOV and CTV.
• Ulstein Verft (Norway): X-bow design family.
• Vard Group (multinational): SOV designs.
• Penguin Shipyard (Singapore): CTV specialist.
• Lürssen (Germany): high-end SOV designs.

Geographic spread

Chapter XV vessels operate in:

• North Sea: largest concentration, supporting UK, Dutch, Belgian, German and Danish wind farms.
• Baltic Sea: growing concentration, with German, Danish, Swedish and Polish wind farms.
• Asian waters: rapidly growing in Taiwan, China, Japan and Korea.
• US East Coast: emerging market following the 2021 to 2024 Federal lease awards.
• Specific oil and gas regions: North Sea, Mediterranean, West Africa, Gulf of Mexico, Asia-Pacific.

Implementation and operational considerations

Flag state implementation

As of 2024-2026, flag states are progressively building Chapter XV implementation capacity. The major flag states for offshore wind operations (UK, Denmark, Norway, Netherlands, Germany) are leading implementation, with class society delegation supporting their inspection capacity. Other flag states (Liberia, Bahamas, Marshall Islands, Panama) have begun building Chapter XV implementation capacity.

Vessel certification

A vessel certified under Chapter XV holds an Industrial Personnel Vessel Safety Certificate issued by the flag state, listing:

• The maximum number of industrial personnel that may be carried.
• The route or operating area.
• Any operational restrictions.
• The supporting IP Code Certificate documenting compliance with the IP Code provisions.

Crew certification

Crew on Chapter XV vessels require:

• STCW certification appropriate to vessel size and route.
• STCW Section A-V/2 familiarisation training (or equivalent for IP-specific operations).
• Industrial-personnel-specific training: covering personnel-transfer operations, gangway operations, emergency response with industrial personnel on board.
• Operational experience documented in the operator’s quality management system.

Operator certification

Operators of Chapter XV vessels typically hold:

• ISM Code Document of Compliance.
• ISO 9001 quality management certification.
• Industry-specific certifications: GWO Sea Survival, RUK (Renewable UK) safety standards, OEUK (Offshore Energies UK) standards.
• Charterer-specific accreditations: various offshore operators (Equinor, Ørsted, BP, Shell, Vestas, Siemens-Gamesa) maintain their own contractor accreditation programmes.

Insurance and P&I

Industrial-personnel vessels are insured under specific P&I provisions covering:

• Crew injury and illness.
• Industrial personnel injury and illness during voyage.
• Wreck and collision.
• Pollution.
• Hull and machinery damage.

P&I coverage for industrial personnel is a specific underwriting consideration because the persons on board are not “passengers” under traditional P&I rules but require similar coverage levels.

Future evolution

Likely amendment cycles

The IP Code is expected to evolve through:

• Operational lessons learned: as the post-2024 fleet accumulates operating hours, lessons will feed into amendments.
• Technology adoption: new transfer methods (improved W2W systems, robotic transfer), new vessel types (electric SOVs, hybrid vessels), new offshore industries (deep-water aquaculture, marine carbon capture, ocean energy).
• Casualty experience: any significant casualty involving industrial personnel will likely drive specific amendments. The pre-2024 regulatory regime had a limited number of incidents; the post-2024 framework’s casualty experience will inform future cycles.
• Other industry adoption: as new offshore industries emerge (tidal energy, wave energy, marine mining), Chapter XV may extend to cover them.

Decarbonisation

Industrial-personnel vessels face the same decarbonisation pressures as the broader fleet:

• EEDI for new construction.
• EEXI retrofit measures for existing vessels.
• CII annual ratings.
• FuelEU Maritime for EU-route operations.

The relatively short voyage lengths and predictable operational profiles of SOVs, CSOVs and CTVs make them well-suited to electric and hybrid propulsion. The first all-electric CTVs entered service from 2022, and battery-hybrid SOVs are progressively replacing diesel SOVs in major operators’ fleets.

Helicopter operations on industrial-personnel ships

Helideck-equipped SOVs

A subset of larger SOVs (typically CSOVs) are equipped with helidecks. Helideck operations on industrial-personnel ships:

• Helideck certification under SOLAS Chapter II-2 Regulation 18, with foam supply and deluge sized for the helicopter type.
• Helideck Operations Officer (HDO): certified personnel responsible for helideck safety during landing and takeoff operations.
• Air traffic coordination with local air traffic control covering the offshore region.
• Weather restrictions for helicopter operations: typically 35 to 40 knot maximum wind, 3 to 5 metre maximum significant wave height, defined visibility minima.
• Crew transfer integration with the vessel’s W2W gangway operations: the helideck provides an alternative transfer route during weather not suitable for gangway transfer.

Helideck-equipped SOVs are particularly common in remote offshore operations (UK Northern North Sea, Norwegian Continental Shelf, Asian deep-water wind farms) where helicopter rotation reduces the operational impact of vessel transit.

Helicopter underwater escape training (HUET)

Industrial personnel travelling by helicopter to the SOV (or directly to the offshore installation) undergo HUET training, typically:

• Initial 4-hour HUET course at a recognised training centre, including submerged helicopter mock-up exercises.
• 24-month refresher cycle with shorter refresher modules.
• CA-EBS familiarisation for compressed air emergency breathing systems used in helicopters.

HUET is mandatory for industrial personnel boarding helicopters in offshore service; the GWO BOSIET programme includes the HUET module.

Helicopter accident response

In the event of a helicopter accident over water, the response involves:

• Crash impact survival: industrial personnel use the impact-protection seat and harness systems plus the personal flotation equipment. The crashworthy fuel system reduces post-crash fire risk.
• Underwater escape: industrial personnel apply HUET techniques to escape submerged or inverted helicopter, using CA-EBS where fitted.
• Survival in water: industrial personnel use lifejackets and personal locator beacons to remain afloat and to signal location.
• Search and rescue activation: SAR resources are dispatched from the offshore installation, the SOV, and shore-based services.
• Recovery: industrial personnel are recovered by SAR helicopter, by the SOV’s rescue boat, or by other vessels in the area.

Industrial-personnel ships participating in helicopter operations maintain dedicated SAR equipment and procedures including liferafts deployable from the helideck or from the deck adjacent.

Decarbonisation of industrial-personnel vessels

Battery-electric CTVs

The first all-electric CTV, the Hydrocat 48 (operated by Northern Offshore on UK wind farm routes), entered service in 2022. Subsequent electric CTVs have been delivered to operators across Europe. Characteristics include:

• Battery capacity: typically 1 to 4 MWh of lithium-ion batteries.
• Operating range: typically 30 to 50 nautical miles per charge, sufficient for a daily wind farm round-trip with margin.
• Charging: shore-side fast-charge at the home port, typically completing overnight.
• Emissions: zero direct emissions; lifecycle emissions depend on the electricity source.
• Operating cost: typically 30 to 50 percent lower than diesel CTVs, though offset by higher capital cost.

Battery-electric CTVs are well-suited to the industrial-personnel application due to:

• Predictable daily routes with known energy demand.
• Shore-side charging infrastructure at established home ports.
• Operating profile compatible with current battery technology.

Battery-hybrid SOVs

SOVs are progressively transitioning to battery-hybrid propulsion:

• Diesel-battery hybrid: combining diesel generators with battery storage, with the battery providing peak shaving for DP operations and zero-emission operation in port.
• Methanol pilot SOVs: a small number of SOVs are designed for methanol fuel, in line with the methanol as marine fuel industry trajectory.
• Ammonia pilot SOVs: under development for late-2020s entry into service.
• Hydrogen fuel cell pilot vessels: very early stage; one or two pilot vessels expected by 2026-2027.

The decarbonisation trajectory for industrial-personnel vessels is constrained by:

• The need for high reliability and availability (downtime is very costly to wind farm operations).
• The need for compatible refuelling infrastructure (both for the vessel and for the destination industrial site).
• The relatively small fleet size (limiting investment in alternative-fuel infrastructure unless shared with the broader maritime sector).

EU EEDI/EEXI/CII implications

Industrial-personnel vessels operating in EU waters (the largest market) are subject to:

• EEDI for new construction (under MARPOL Annex VI): with vessels designed for high efficiency.
• EEXI for existing vessels: typically not a constraint for the relatively new industrial-personnel fleet but applies as the fleet ages.
• CII annual ratings: industrial-personnel vessels with their high-power-density operating profile may face CII challenges.
• FuelEU Maritime: in force from 2025, requiring reduction in well-to-wake greenhouse gas intensity.
• EU ETS: in force from 2024, requiring purchase of emissions allowances.

The decarbonisation regulatory pressure, combined with offshore wind operators’ own sustainability targets, is driving rapid adoption of electric and hybrid solutions in this sector.

Cooperation with offshore industry

Charterer accreditation programmes

Major offshore wind operators (Equinor, Ørsted, BP, Shell, Vestas, Siemens-Gamesa) maintain their own contractor accreditation programmes covering:

• Technical capability of the vessel and operator.
• Safety performance track record.
• Environmental performance.
• Crew competence and training.
• Operational procedures including emergency response, weather management.

The accreditation programmes typically exceed the IP Code minimum requirements and impose contract-specific expectations on operators.

Integrated emergency response

A unique feature of industrial-personnel operations is the integration of vessel emergency response with the destination industrial site. Specifically:

• Wind farm emergency response coordinator: the wind farm operator typically has a 24/7 control centre coordinating emergency response across all vessels, helicopters and shore-side resources.
• Joint emergency drills: vessels and wind farm operators conduct joint drills covering scenarios involving both the vessel and the offshore installation.
• Mutual aid: vessels in the area provide mutual assistance to one another and to the wind farm.
• Shore-based rescue: helicopter and shore-based rescue services are pre-positioned for rapid response to industrial-personnel-vessel casualties.

The integrated emergency response is a key element of the safety case justifying the lighter LSA and emergency-response burden under the IP Code compared with passenger ship regulation.

IP Code chapter walkthrough

IP Code Chapters 1-2: General

Chapters 1 and 2 of the IP Code provide:

• Definitions (industrial personnel, industrial activities, personal survival training, etc.).
• Application to ships of various types and sizes carrying industrial personnel.
• Equivalent arrangements allowing the flag state to approve novel solutions where the prescriptive provisions are unworkable.
• Survey and certification scheme aligned with the broader SOLAS survey regime.

IP Code Chapter 3: Buoyancy, stability and subdivision

The stability requirements for industrial-personnel ships are intermediate between cargo ships and passenger ships:

• Intact stability with criteria based on the ship’s operating profile (typical industrial-personnel vessels operate in coastal or short-sea conditions).
• Damage stability with single-compartment damage as the basic requirement, with two-compartment damage required for higher-personnel-count vessels.
• Free-surface effect management for ballast and consumable tanks on board.

The damage stability methodology aligns with the SOLAS Chapter II-1 probabilistic regime, with calibration appropriate to the industrial-personnel vessel category.

IP Code Chapter 4-7: Machinery, electrical, UMS, auxiliary

Machinery and electrical provisions are largely aligned with cargo ship requirements under SOLAS Chapter II-1 Parts C, D and E. Specific industrial-personnel adaptations include:

• Increased emergency power capacity to support evacuation lighting and communication for the larger industrial personnel complement.
• Dynamic positioning class 2 (DP-2) for SOV/CSOV stationkeeping among offshore installations, with redundancy in DP control systems.
• DP class 3 (DP-3) for higher-criticality applications (typically not required for the general industrial-personnel ship but used for ROV mother ships, dive support vessels).

IP Code Chapter 8: Fire safety

Fire safety provisions combine:

• Cargo ship fire integrity for spaces away from accommodation.
• Adapted passenger-ship fire safety for accommodation areas housing industrial personnel.
• Smoke detection in industrial personnel cabins and corridors.
• Sprinkler protection for high-occupancy areas.
• Fire patrol during periods of higher fire risk.
• Galley fire suppression on vessels with substantial galleys serving multi-day operations.

IP Code Chapter 9: Life-saving appliances

LSA capacity for industrial-personnel ships:

• 100 percent LSA capacity for all persons on board (industrial personnel plus crew), provided through a combination of survival craft (typically liferafts) and rescue boats.
• Personal LSA (lifejackets, immersion suits, thermal protective aids) for each industrial personnel.
• Embarkation arrangements sized for the larger personnel complement.
• Marine evacuation systems where prescribed by ship size and operational profile.

IP Code Chapter 10-11: Navigation and radio

Navigation and radio provisions align with SOLAS Chapter V and Chapter IV (GMDSS) for cargo ships. Industrial-personnel ships typically operate within GMDSS sea area A1 (VHF coverage) for European wind farm operations, with broader coverage for larger SOVs operating internationally.

IP Code Chapter 12: Dangerous goods

Where industrial-personnel ships carry dangerous goods (typically minor quantities for industrial work, paints, lubricants, hydraulic fluids), the IP Code Chapter 12 references the IMDG Code and provides specific provisions for the industrial-personnel context.

IP Code Chapter 13: Personnel transfer

Chapter 13 addresses the unique IP Code element: transfer of personnel between the ship and the offshore installation. Provisions cover:

• Transfer methods: Walk-to-Work gangway, personnel basket, helicopter, CTV approach.
• Operational limits for each method (significant wave height, wind speed, visibility).
• Equipment requirements for each method.
• Personnel preparation including PPE, briefing, head count.
• Communication between the vessel, the offshore installation, and the personnel during transfer.
• Emergency abort procedures if conditions deteriorate during transfer.

The IP Code Chapter 13 has been extensively developed with industry consultation and reflects best practice from the offshore wind, oil and gas and aquaculture sectors.

IP Code Chapter 14: Personnel survival training

Chapter 14 specifies the training requirements for industrial personnel:

• Survival at sea training: minimum competence in self-help and rescue actions.
• Specific equipment familiarity: the personal LSA the industrial personnel will use.
• Refresher training cycle: typically 24-month validity with mandatory refresher.
• Documentation: each industrial personnel must hold a valid training certificate verifiable by the master before boarding.

IP Code Chapter 15: Operations

Operational provisions cover:

• Pre-voyage briefing to industrial personnel.
• Muster drills during voyages of significant duration.
• Personnel-on-board (POB) tracking with continuous count and identification.
• Emergency response procedures integrated with destination industrial site.
• Voyage planning including the destination industrial site’s operational schedule.

IP Code Chapter 16-18: Maintenance, equipment, protection

Final chapters cover:

• Maintenance, inspection and survey schedule for industrial-personnel ships.
• Personnel safety equipment beyond personal LSA.
• Personal protection measures including PPE for industrial work and for vessel safety.

Industrial personnel ship architectures

Typical SOV layout

A typical SOV layout includes:

• Cabin accommodation for industrial personnel and crew, typically 2-person cabins for crew and 1-person cabins for industrial personnel (depending on operator).
• Mess and recreation areas for off-shift relaxation.
• Galley and food storage for multi-day operations.
• Industrial personnel work spaces: tool storage, parts inventory, briefing rooms.
• W2W gangway operating area typically forward, with bridge oversight.
• Crane and deck working area for cargo handling.
• Engine room (typically with diesel-electric propulsion, increasingly with battery hybrid).
• DP control bridge wing for stationkeeping operations.
• Helideck on some SOVs and most CSOVs.

The layout balances industrial-personnel comfort (for retention and productivity over multi-day operations) with operational functionality (efficient transfer, cargo handling, emergency response).

Typical CTV layout

A typical CTV layout is more compact:

• Bridge at the forward upper deck.
• Industrial personnel cabin typically the main passenger compartment in the upper hull, with airline-style seating for transit.
• Crew quarters for the multi-person crew.
• Galley/messing small-scale.
• Engine room with twin diesel engines and water-jets.
• Bow transfer area with non-skid surface and boarding rails.

The layout supports rapid embarkation and disembarkation at port and at the wind turbine, with industrial personnel transit time minimised.

Casualty experience

Chapter XV vessels (and their pre-2024 predecessors operating as Special Purpose Ships or under flag-state-specific rules) have generally a strong safety record. Notable incidents include:

Wind farm transfer incidents

Multiple incidents of injuries to industrial personnel during CTV transfers, typically:

• Slips and falls during the bow-to-turbine transfer step.
• Crush injuries between the CTV bow and the turbine boat landing in unexpected wave or wind shifts.
• Hand entrapment in transfer equipment.

The incidents typically result in injury rather than fatality but have driven progressive improvement of transfer procedures and equipment.

W2W gangway incidents

Several incidents involving W2W gangway operations:

• Active compensation system failures with the gangway not following the wave motion correctly, leading to gangway-to-turbine impact.
• Personnel slip and fall on the gangway during transit.
• Communication failures between the vessel, the gangway operator, and the industrial personnel.

These incidents have driven improvements in gangway control software, training, and pre-transfer checklists.

CTV grounding and collision incidents

Several CTV groundings and minor collisions, typically:

• Grounding on rocks during low-tide operations.
• Collision with wind turbine during dynamic-pushing approach in unexpected wave conditions.
• Collision with other CTVs in busy wind farm waters.

These incidents have driven attention to bridge resource management training for CTV crews and to wind farm traffic management.

Comparison with passenger ferry casualties

The casualty rate for industrial-personnel ships per persons-on-board-hour has been substantially lower than for passenger ferries on similar coastal routes. Contributing factors include:

• The professionally-trained industrial personnel complement (versus the broader passenger demographic).
• The shorter typical voyage duration.
• The higher operational discipline imposed by the offshore industrial sector.
• The integrated emergency response with the destination industrial site.

The strong safety record was a contributing factor in the IMO’s decision to develop a tailored regulatory regime rather than apply full passenger ship requirements.

Vessel types in detail

Crew Transfer Vessels (CTVs)

CTVs are the workhorses of daily wind farm operations. Typical characteristics:

• Size: 18 to 30 metre LOA, with the smaller end carrying 12 industrial personnel and the larger end up to 24.
• Hull form: typically aluminium catamaran or trimaran, with bow shape optimised for wind turbine push-on transfer (the “fender” approach).
• Speed: 25 to 30 knots in service, allowing rapid transit between port and offshore wind farm.
• Crew: typically 2 to 4 (master, chief officer, deckhand, sometimes a deck rating).
• Operational range: typically 30 to 50 nautical miles from base port (limiting daily round-trip to 4 to 6 hours of sailing).
• Endurance: typically 24 to 48 hours self-sufficient endurance, with daily port returns.

CTV operators include: HST Marine (UK), MPI (Belgium), Northern Offshore (Denmark), Damen-built CTVs operated by various companies. Major shipyards include Penguin (Singapore), Damen, and various European specialist yards.

Service Operation Vessels (SOVs)

SOVs are larger vessels that stay among the wind farm for multi-day operations, accommodating industrial personnel for the duration. Typical characteristics:

• Size: 80 to 90 metre LOA, with displacement around 4,000 to 6,000 tonnes.
• Hull form: typically conventional displacement hull, with active motion compensation systems.
• Speed: 12 to 15 knots transit, typically reduced for stationkeeping among turbines.
• Crew: typically 12 to 20 (master, navigation officers, engineers, deck and engine ratings).
• Industrial personnel capacity: typically 30 to 60 in dedicated cabin accommodation.
• DP class: typically DP-2 (Dynamic Positioning Class 2) for stationkeeping among wind turbines.
• Walk-to-Work gangway: motion-compensated, typically 25 to 35 metre reach, enabling direct transfer to wind turbine transition pieces.
• Endurance: typically 30 days self-sufficient endurance.

SOV operators include: Esvagt (the original SOV operator with a fleet of approximately 25 vessels), North Star Shipping, Edda Wind, MMA Offshore. Major SOV shipyards include Damen, Ulstein Verft, Vard Group, Lürssen.

Commissioning Service Operation Vessels (CSOVs)

CSOVs are SOVs with additional commissioning equipment, used during the construction and commissioning phase of wind farm projects. Characteristics include:

• Heavier crane capacity (300+ tonnes) for component lifts.
• Additional accommodation (typically 60 to 100 industrial personnel).
• Specialist tools and equipment for blade installation, nacelle commissioning, cable connection.
• Larger deck space for tooling and spare components.

CSOVs are typically deployed for 12 to 24 months on a wind farm during construction, then redeployed to the next project. The CSOV market has grown rapidly with the European, US East Coast and Asian wind farm pipelines.

Crew Transfer Catamarans (CTCs)

A larger CTV variant designed for slightly longer routes or for higher-personnel-count operations. Characteristics include:

• Larger size (30 to 40 metres LOA).
• Higher industrial personnel capacity (24 to 36).
• Same fundamental concept (catamaran hull, push-on transfer) as standard CTV.

Walk-to-Work (W2W) Gangway Operations

The W2W gangway is a critical piece of SOV/CSOV equipment, allowing industrial personnel to walk from the vessel to the wind turbine in active motion compensation. Key characteristics:

• Reach: typically 25 to 35 metres horizontal extension.
• Compensation range: 3 to 5 metres of vertical motion compensation, allowing operations in significant wave heights up to 2.5 to 3 metres.
• Compensation technology: hydraulic or electro-hydraulic actuators with closed-loop control.
• Operator: trained gangway operator on the vessel monitoring the connection and supervising personnel transit.
• Connection point: typically the wind turbine transition piece’s W2W boat landing or dedicated W2W docking area.
• Limitations: maximum operating wind, wave, and visibility conditions defined by the manufacturer and the operator.

W2W gangway operations have been a significant safety improvement over previous transfer methods, reducing the risk associated with crane-deployed personnel baskets and stepping-off-bow CTV transfers.

Survival training requirements

GWO BOSIET

The Global Wind Organisation (GWO) Basic Safety Training (BST) standard is the industry baseline for offshore wind survival training. The GWO BST programme includes:

• Sea Survival Training: 8 hours, covering survival in liferaft, immersion suit donning, helicopter underwater escape, signalling, group survival.
• First Aid: 16 hours, covering basic first aid, CPR, oxygen administration, casualty management.
• Manual Handling: 4 hours, covering safe lifting, ergonomics.
• Working at Heights: 16 hours, covering harness use, fall arrest, vertical access, rescue.
• Fire Awareness: 4 hours, covering fire prevention, extinguisher use, escape.

The GWO BOSIET (Basic Offshore Safety Induction and Emergency Training) is a more comprehensive variant covering:

• All BST elements plus
• Helicopter Underwater Escape Training (HUET) at full scale, with submerged helicopter mock-up.
• Compressed Air Emergency Breathing System (CA-EBS) familiarisation.
• Helicopter safety briefing.

Refresher training

GWO BST and BOSIET certifications are valid for 24 months, after which refresher training is required. Refresher programmes typically run 1 to 2 days and update on:

• Recent incident lessons learned.
• Equipment changes (new generations of survival suit, new helicopter types).
• Procedural updates.

Industry-specific equivalent training

Other industries operating ships under Chapter XV have their own training requirements:

• Oil and gas: OPITO BOSIET (Offshore Petroleum Industry Training Organisation) or equivalent regional standards (NOGEPA Netherlands, Nor-Norway, etc.).
• Aquaculture: developing industry-specific training, often based on GWO modules with aquaculture-specific additions (fish handling, net pen operations, water quality monitoring).
• Decommissioning: requires both BOSIET and additional decommissioning-specific safety training (asbestos awareness, lead and mercury exposure, confined space entry).

The IP Code recognises industry-equivalent training programmes; the operator is responsible for verifying that each industrial personnel holds appropriate training.

Industrial personnel safety equipment

Personal LSA

Each industrial personnel on a Chapter XV vessel has assigned:

• Lifejacket: of approved type with light, whistle, retro-reflective material.
• Immersion suit: rated for the operating area’s water temperature, with personally-fitted size.
• Thermal protective aid: for prolonged survival craft exposure.
• Personal locator beacon (PLB): in some operations, an individual beacon for shore-side tracking and post-incident location.

The personal LSA is stowed in the industrial personnel’s cabin and must be donned within defined time limits during muster.

Industrial-specific PPE

Beyond personal LSA, industrial personnel carry:

• Helmet: required for outdoor work and for transit on the wind turbine.
• Safety boots: with steel toe caps.
• High-visibility outerwear: bright colours with retro-reflective material.
• Safety harness: fall-arrest equipment for working at heights.
• Tool kit: industry-standard tool kits for wind turbine, oil and gas, or aquaculture operations.

The industrial PPE is the responsibility of the industrial personnel’s employer (typically the wind farm operator, oil and gas operator, or aquaculture company), not of the carrying vessel operator.

Specific operational scenarios

Daily wind farm operations

A typical daily wind farm operation:

• Pre-departure (around 0530 to 0630): industrial personnel arrive at port, sign in, attend pre-departure briefing covering weather, route, work assignments. CTV operator confirms vessel readiness.
• Departure and transit (0630 to 0830): CTV transits to wind farm at 25 knots, with industrial personnel in seated cabin during transit.
• Wind turbine approach (varies by farm geometry): CTV approaches first turbine, master conducts dynamic-pushing approach to the turbine’s transition piece. Lead industrial personnel steps from CTV bow to the turbine’s boat landing.
• Personnel transfer (5 to 10 minutes per turbine): all industrial personnel transfer to the turbine, with the CTV holding station.
• Work period (typically 4 to 8 hours): industrial personnel work on the turbine; the CTV may move to other turbines or return to a designated holding position.
• Recovery and transit (afternoon): CTV returns to retrieve personnel, conducts the reverse transfer, and transits home.
• Return to port (around 1700 to 1900).

The daily operation is highly weather-dependent: wind, wave, and visibility limits are defined for each transfer method, and the operations manager monitors forecast conditions to decide whether to dispatch.

Multi-day SOV operations

A typical multi-day SOV operation:

• Mobilisation: SOV departs port with industrial personnel embarked, transits to the wind farm (typically 4 to 12 hours).
• On-site arrival: SOV anchors or stations on dynamic positioning at the wind farm. Industrial personnel begin daily turbine transfers via W2W gangway.
• Daily turbine transfer cycle: each day, industrial personnel transfer to assigned turbines for work, returning to the SOV at end of shift. Multiple turbines per day per team.
• Onboard time: industrial personnel live on the SOV for the operation duration (typically 7 to 21 days), with cabin accommodation, meals, recreation facilities.
• Demobilisation: SOV returns to port at end of operation, industrial personnel disembark, replacement personnel embark for the next operation.

The SOV operational pattern is closer to oil and gas platform supply rotation than to passenger ship voyages.

Weather restrictions

Each transfer method has defined weather restrictions:

• CTV push-on transfer: typically maximum 1.5 metre significant wave height.
• W2W gangway: typically maximum 2.5 to 3 metre significant wave height.
• Helicopter transfer: typically maximum 30 to 35 knot wind, with visibility restrictions.

When weather exceeds the transfer-method limits, operations are typically suspended; industrial personnel either remain on the vessel (if SOV) or are transported back to port (if CTV operation suspended).

Documentation

Every ship covered by Chapter XV carries on board:

• Industrial Personnel Vessel Safety Certificate: the primary certificate of compliance.
• IP Code Certificate: detailed compliance under the IP Code.
• Maximum personnel capacity: documented in the certificate and posted on board.
• Personnel transfer manual: detailing the transfer methods and operational procedures.
• Industrial personnel certificates: documenting survival-at-sea training (e.g. GWO BOSIET) for each person on board.
• Crew training records: STCW certificates plus IP-specific training.
• Voyage data records including personnel-on-board (POB) tracking.
• Emergency response procedures: integrated with the destination industrial site’s emergency response.

Related Calculators

• SOLAS XV - Industrial personnel capacity check Calculator
• SOLAS XV - W2W gangway operational limits Calculator
• SOLAS V/19, Carriage requirements Calculator
• SOLAS III/1, Application LSA Calculator

See also

• SOLAS Convention parent article
• SOLAS Chapter II-1: Construction, Subdivision, Stability, Machinery and Electrical Installations
• SOLAS Chapter II-2: Fire Protection, Detection and Extinction
• SOLAS Chapter III: Life-Saving Appliances and Arrangements
• SOLAS Chapter V: Safety of Navigation
• SOLAS Chapter X: Safety Measures for High-Speed Craft
• SOLAS Chapter XI-1: Special Measures to Enhance Maritime Safety
• STCW Convention
• MLC 2006
• ISM Code
• Polar Code (relevant for industrial-personnel ships in polar waters)

Additional calculators:

• Wind SOV (Service Operation Vessel) Fuel & CO₂ Calculator
• CTV (Crew Transfer Vessel) Fuel & CO₂ Calculator

Additional related wiki articles:

• FSS Code: International Code for Fire Safety Systems
• IGC Code: Construction of Gas Carriers
• LSA Code: International Life-Saving Appliance Code

References

• IMO, International Convention for the Safety of Life at Sea (SOLAS), 1974, as amended, Chapter XV.
• IMO Resolution MSC.521(106) (2022), Adoption of amendments to SOLAS introducing Chapter XV.
• IMO Resolution MSC.527(106) (2022), Adoption of the International Code of Safety for Ships Carrying Industrial Personnel (IP Code).
• IMO MSC.1/Circ.1640 and successor circulars on industrial personnel implementation guidance.
• GWO (Global Wind Organisation) Standard for Basic Safety Training (BST) and Basic Offshore Safety Induction and Emergency Training (BOSIET).
• Offshore Wind Industry Council annual reports.
• WindEurope industry reports.
• Esvagt and other operator publications on SOV and CSOV operations.