Your examiner asks: "Explain Type A, B-60 and B-100 damage stability standards for tankers, and what the numbers mean."

A. These relate to the subdivision/damage survival standard applied based on tanker size and cargo carried, broadly correlating to the deadweight/length thresholds in MARPOL Annex I — Type A applies to the largest crude/product tankers, with B-60 and B-100 representing alternative standards permitted for somewhat smaller or differently-arranged tankers; the numbers broadly relate to the assumed extent of side damage (as a function of breadth) the standard requires the vessel to survive, with B-100 generally representing a more demanding standard than B-60 for the size category it applies to.

B. Type A, B-60 and B-100 are purely classification society notations with no MARPOL or SOLAS regulatory basis.

C. These standards apply identically regardless of tanker size, cargo type or MARPOL Annex I deadweight thresholds.

D. B-60 and B-100 refer to the percentage of cargo that may be carried in single-skin tanks, unrelated to damage stability.

A. Report it immediately to the bridge/Master — do not wait to "confirm" the problem alone — note the apparent quantity/rate of ingress if safely observable, avoid taking any action (e.g. opening further compartments to investigate) that could inadvertently worsen flooding or compromise watertight integrity elsewhere, and stand by for instructions while keeping the area under observation if it is safe to do so.

B. Attempt to fully diagnose and resolve the source of ingress alone before reporting, to avoid raising a false alarm.

C. No report is necessary unless the water level visibly rises during the time you happen to be observing it.

D. Open adjacent compartments immediately to inspect for similar flooding, before reporting the initial finding.

A. Damage stability standards scale with vessel size, type and the consequence of loss — larger vessels and those carrying passengers represent a greater potential loss of life and asset value if lost, and (generally) have more internal volume/length available to provide additional subdivision, so regulations require them to survive a more demanding flooding scenario (e.g. two or more compartments) rather than the less demanding standard that might apply to a smaller vessel.

B. Vessel size has no bearing on the number of compartments a damage stability standard requires the vessel to survive; the same fixed number applies to every ship regardless of size or passenger status.

C. Smaller vessels are required to survive more simultaneously flooded compartments than larger ones, since they have less reserve buoyancy.

D. Passenger-carrying status has no bearing on damage stability standards; only cargo-carrying capacity is relevant.