Large Yacht Code — Fire & Damage Control Practice Questions

A. STRUCTURAL FIRE PROTECTION SCALING UNDER THE CODE: For yachts at or above 500GT, structural fire protection requirements are derived from SOLAS passenger ship rules applicable to ships carrying fewer than 36 passengers — meaning more extensive fire-resisting bulkhead/deck divisions, stricter fire integrity ratings, and more comprehensive main vertical/horizontal zone subdivision. Below 500GT, the Code applies a proportionately reduced standard reflecting the smaller scale of the vessel and lower absolute fire risk exposure, while still requiring proper compartmentation and insulation standards (e.g. A-class/B-class divisions appropriate to the space). PRACTICAL EFFECT: a 600GT yacht crossing the 500GT line must meet the more demanding passenger-ship-derived standard in full, while a 480GT yacht just under the line is not required to meet that same level — this is precisely why GT, not just length or layout similarity, drives a real difference in required fire protection between two superficially similar vessels. CREW IMPLICATION: an officer transferring between a sub-500GT and a 500GT+ yacht should not assume the same fire safety standard or zone layout applies — review the specific vessel's fire control plan and CCC rather than relying on experience from a similarly-sized yacht under a different tonnage band.

B. Tonnage has no bearing on structural fire protection standards under the Code; all coded yachts above 24m regardless of GT must meet an identical fixed standard.

C. Fire protection standards are set entirely by the yacht's classification society on a vessel-by-vessel basis with no reference to GT thresholds in the Code itself.

D. The 500GT threshold only affects manning requirements, not fire protection — fire safety standards are governed solely by passenger numbers under the Code.

A. A-CLASS / B-CLASS FIRE INSULATION STANDARDS — MACHINERY SPACES: Under the Code's structural fire protection requirements, decks and boundaries enclosing machinery spaces must be insulated to reach a defined fire-resistance standard for a defined period: A-30 means the division must remain effective as a fire/smoke barrier and limit temperature rise on the unexposed side for at least 30 minutes under standard fire test conditions, required for vessels in UNRESTRICTED SERVICE (i.e. capable of extended ocean passages, away from immediate rescue/shore-based fire support). B-15 is a lower fire-resistance class (15 minutes) permitted for vessels operating only in SHORT RANGE NAVIGATION (a more limited area, generally closer to shore/assistance), reflecting the reduced risk exposure and faster potential access to external assistance. WHY THE DIFFERENCE EXISTS: the Code's structural fire protection requirements are calibrated to the realistic time a crew may need to contain and fight a fire before either bringing it under control or reaching a point where external assistance/evacuation becomes practical — a vessel restricted to coastal/short-range operation can rely on a shorter self-sufficiency window than one on an unrestricted ocean passage far from any assistance. PRACTICAL POINT FOR CREW: the vessel's actual service notation (unrestricted vs short range) is not just an operational limitation — it is tied directly to the fire insulation standard the vessel was built and surveyed to, so operating outside the certificated service notation can mean operating with fire protection inadequate for that profile.

B. A-30 and B-15 refer to the colour-coding of fire extinguishers required in machinery spaces, not to structural insulation standards.

C. A-30 applies to short range navigation vessels and B-15 applies to unrestricted service vessels — the reverse of the higher standard being for greater self-sufficiency.

D. These classifications are obsolete terminology from LY1 and no longer appear in any current edition of the Code.

A. WINDOW CONSTRUCTION IN FIRE-RATED BOUNDARIES — WHAT TO CHECK: Where windows are fitted within a structural fire boundary (e.g. adjacent to galley, machinery space casings, or main vertical zone bulkheads), the Code requires the window construction itself to meet the relevant fire-resistance standard for that boundary — ordinary glazing does not maintain the fire integrity of an otherwise-rated bulkhead/deck. Before any refit proposal proceeds: (1) Confirm whether the boundary in question is fire-rated under the vessel's approved fire control plan — not all interior glazing is in a rated boundary, but glazing near galleys, machinery spaces and escape routes very often is; (2) If rated, confirm the proposed replacement glazing has been tested and certified to the equivalent fire-resistance standard (not just "fire-resistant glass" marketing language — specific test certification is required); (3) Larger panoramic glazing changes the boundary's structural behaviour and may also affect escape route width/sightlines, which the surveyor will assess; (4) Any change to a fire-rated boundary is a Code-relevant alteration that should be reviewed by the classification society/flag state BEFORE installation, not retrospectively — installing non-compliant glazing in a rated boundary and only discovering it at next survey risks a deficiency, remedial cost, and potential CCC implications. NEVER ASSUME aesthetic/structural glazing suppliers have accounted for marine fire-rating requirements without independent confirmation.

B. Window material in fire-rated boundaries is purely an aesthetic/owner preference matter and has no bearing on the Code's structural fire protection requirements.

C. Fire-rated boundary requirements only apply to bulkheads and decks; windows and other glazed openings are entirely excluded from structural fire protection requirements under the Code.

D. Any double-glazed window automatically satisfies fire-rated boundary requirements regardless of certification, since double glazing is assumed to provide adequate fire resistance.