Overview
ISO 14886:2014 - Ships and marine technology - Large yachts - Structural fire protection for FRP yachts - defines requirements and an equivalency method for the structural fire protection of large fibre‑reinforced plastic (FRP) yachts. It applies to yachts 24 m and over carrying up to 12 passengers and is not applicable to SOLAS‑regulated vessels. The standard uses heat‑transfer principles (the Fourier Number) to assess whether a proposed insulated FRP sandwich laminate is equivalent to a fire‑tested model laminate approved under the IMO FTP Code.
Key Topics
- Scope and exclusions
- Applies to large FRP yachts (≥24 m, ≤12 passengers).
- Does not cover SOLAS vessels or details such as attachments, penetrations, doors, windows and hatches that may impair performance.
- Equivalency method
- Uses the Fourier Number (Fo) to compare heat flow through candidate insulation with a model, fire‑tested mineral‑wool insulated sandwich laminate.
- Equivalency criterion: Fo(candidate) ≤ Fo(model), and candidate skins/cores must be at least as thick/dense as the model.
- Fourier Number (as given in the standard): Fo = (k / (ρ · Cp)) × (t / x)
- where k = thermal conductivity, ρ = density, Cp = specific heat, t = fire exposure time, x = insulation thickness.
- Material and laminate requirements
- Insulation fitted on the fire‑exposed side; surfaces protected against splash of flammable liquids.
- Minimum skin thickness specified (skins not less than 3 mm).
- Heat deflection temperature (HDT) of model skins must be ≤ HDT of candidate skins (post‑cured status identified).
- Testing and performance
- References IMO FTP Code tests (Corner Room Test, ISO 9705) and IMO resolutions for fire‑resisting division classification (e.g., MSC.45(65)).
- Specifies thermal properties for the model mineral wool and test temperature ranges for Fire‑resisting Division 60 and 30.
- Includes provisions for resin ignition tests and adhesion/fastening performance at elevated temperatures.
- Documentation
- Annexes define the model, test procedures, specification items and reporting requirements for equivalency certificates.
Applications
- Used by naval architects, yacht designers, shipbuilders and composite engineers to demonstrate fire performance of insulated FRP sandwich constructions.
- Employed by classification societies, flag administrations and fire safety consultants to assess and approve non‑SOLAS large yachts.
- Guides insulation and laminate manufacturers in specifying materials and production testing to meet fire‑resistance equivalency.
Related Standards
- IMO FTP Code (Fire Test Procedures)
- ISO 9705 (Full‑scale room test for surface products)
- ISO 834‑1 (Fire‑resistance tests - Elements of building construction)
- Relevant IMO resolutions cited in the standard (e.g., MSC.45(65), A.754(18))
Keywords: ISO 14886:2014, structural fire protection, FRP yachts, large yachts, Fourier Number, fire‑resisting division, IMO FTP Code, insulation equivalency, resin ignition.