Life-saving appliances are the equipment nobody wants to use and everybody must be able to trust. On ships trading internationally, the framework is set by SOLAS Chapter III and the International Life-Saving Appliance (LSA) Code, which together define what must be carried, how it must perform and how it must be looked after. This guide explains those requirements and the practical checks buyers should make when specifying life jackets, life buoys, immersion suits or rescue boats.
What SOLAS Chapter III and the LSA Code require
SOLAS Chapter III covers life-saving appliances and arrangements, including requirements for lifeboats, rescue boats and life jackets according to ship type. The technical rules sit in the LSA Code, which is mandatory under regulation 34: all life-saving appliances and arrangements must comply with its applicable requirements, according to the IMO’s summary of the SOLAS Convention.
Flag states implement the convention through their own regulations and approval schemes. In the United States, 46 CFR Part 199 sets out lifesaving systems for inspected vessels and ties equipment to Coast Guard approval series and IMO instruments. The practical consequence is that a product’s paperwork matters as much as its physical design: approval numbers, markings and certificates have to match what the flag state and the ship’s safety certificate require.
Life jackets: approval, buoyancy and visibility
Under the US rules, each vessel must carry life jackets approved under approval series 160.155 or 160.176, with one for each person on board, additional child-size jackets equal to at least 10 percent of the passenger count, and extra jackets for watchkeepers and remotely located survival-craft stations. Each jacket must carry a light, a whistle and Type I retro-reflective material, and stowage positions must be marked (46 CFR 199.70).
Performance standards sit alongside those carriage rules. ISO 12402-2:2020 specifies safety requirements for life jackets at performance level 275, intended for adults, children or infants in offshore use under severe conditions or when protective clothing is worn or additional loads are carried (ISO 12402-2:2020). A buyer comparing a “SOLAS life jacket” with a “275 N life jacket” should confirm which approval route the vessel actually needs, because the two descriptions are not automatically interchangeable.
Life buoys: quick release, lights and lines
Life buoys must be approved under approval series 160.150, capable of being rapidly cast loose, and never permanently secured. They must be distributed so that they are readily available on each side of the vessel, with at least one near the stern. At least one buoy on each side needs a buoyant lifeline that is at least twice the stowage height above the waterline or 30 meters long, whichever is greater, non-kinking, at least 8 mm in diameter and rated to a breaking strength of at least 5 kN. At least half the buoys must carry self-igniting lights, and at least two must carry self-activating smoke signals and lights; each buoy is marked with the vessel’s name and port (46 CFR 199.70).
These details are where quotations often go wrong. A specification that says only “SOLAS lifebuoy” leaves the buyer to assume the lifeline, light and smoke-signal configuration, so it is worth writing the required configuration into the inquiry itself.
Immersion suits: buoyancy and thermal protection
Vessels other than those operating on routes between 32° north and 32° south must carry immersion suits, or anti-exposure suits, for every person assigned to the rescue boat crew and the marine evacuation system crew; the suits also need lights and whistles (46 CFR 199.70). The US performance rule requires adjusted buoyancy of at least 100 N for adult and oversize adult suits and at least 50 N for child suits, with no more than 5 percent loss after 24 hours’ submersion in fresh water. The wearer must float in a stable position with the head tilted between 30 and 80 degrees above the horizontal and the mouth and nose at least 120 mm above the surface, with auxiliary buoyancy permitted if needed (46 CFR 160.171-11).
Suits are also classified by use. ISO 15027-1:2026 sets performance and safety requirements for constant-wear suits and suit systems that reduce cold shock and delay the onset of hypothermia, while abandonment suits are covered by ISO 15027-2 (ISO 15027-1:2026). A constant-wear suit and an abandonment suit are different products, and the order should say which one the vessel’s risk assessment calls for.
Rescue boats: performance standards, not just hull shape
SOLAS Chapter III includes rescue boats among the appliances it regulates (IMO). In the US approval route, 46 CFR 160.156-7 requires rescue boats and fast rescue boats to meet IMO LSA Code chapter V, the IMO Revised recommendation on testing part 1/7, 46 CFR part 159 and subpart 160.156. The boat must be operable by people wearing immersion suits, give the operator the specified all-round visibility, use steel, aluminum or fiber-reinforced plastic (FRP) for major rigid structure, and use accepted buoyancy foam of 32 ±8 kg/m³ with all required voids filled (46 CFR 160.156-7).
The implication for buyers is direct: a recreational or commercial RIB built to a general small-craft standard is not automatically a SOLAS rescue boat, even when the dimensions look similar. The approval route, not the shape of the tubes, decides the category.
What buyers should verify before ordering
| Check | What to ask for |
|---|---|
| Approval | The approval certificate and approval series number for the flag state, plus the marking that will appear on the product. |
| Standard | The edition and part of the standard being applied (for example ISO 12402-2:2020 or ISO 15027-1:2026), not just a trade description. |
| Configuration | Lifeline, light, smoke signal, whistle and retro-reflective material as required for the stowage position. |
| Traceability | Serial or batch numbers linking the item to its test records and certificate. |
| Documentation | Maintenance instructions, spare-parts list and a log format the crew can actually use. |
The documentation point is not administrative decoration. US rules require the manufacturer’s onboard maintenance instructions to include checklists, maintenance and repair instructions, a periodic maintenance schedule, a lubrication diagram, a list of replaceable parts, sources of spare parts and a log for inspection and maintenance records, and require each appliance to be in working order before the vessel leaves port (46 CFR 199.190).
Where to start
Buyers can review the safety equipment category to compare product types, and look at example craft such as FRP rigid rescue boats and inflatable rescue boats when a tender or rescue-boat requirement is being scoped. Sending a detailed inquiry with the flag state, vessel type, stowage position and required standard is usually the fastest way to get a comparable quotation.
The safest approach is to treat approval, performance standard and maintenance support as one package. A life-saving appliance is only compliant if it can be shown to be compliant, and only useful if it is ready when it is needed.
Sources
- IMO — International Convention for the Safety of Life at Sea (SOLAS), 1974
- 46 CFR Part 199 — Lifesaving Systems for Certain Inspected Vessels
- 46 CFR 199.70 — Personal lifesaving appliances
- 46 CFR 199.190 — Operational readiness, maintenance, and inspection of lifesaving equipment
- 46 CFR 160.171-11 — Immersion suits, performance
- 46 CFR 160.156-7 — Design, construction and performance of rescue boats and fast rescue boats
- ISO 12402-2:2020 — Lifejackets, performance level 275 (abstract)
- ISO 15027-1:2026 — Constant wear suits and suit systems (abstract)
