Question 1

A shipper gives you a certificate showing moisture below the TML, but the cargo on the barges is visibly wet after heavy monsoon rain. What does the West guidance say you should do?

Accepted Answer

Stop loading if there is wet cargo or free water, and get satisfactory evidence moisture remains below the TML before resuming The Club tells masters to monitor cargo and weather continuously, stop loading immediately if wet cargo, free water or doubtful documents appear, and re-verify after heavy rain. The master has overriding responsibility and commercial pressure must never override safety.

Question 2

The yacht is loading additional stores and fuel before a long passage, raising the displacement significantly. What effect does this have on stability that you, as OOW, should be aware of?

Accepted Answer

Increased displacement generally raises the centre of gravity if weight is added high up, and free surface effects in partially-filled tanks can reduce the effective metacentric height (GM) Adding weight changes the vessel's centre of gravity depending on where it is stowed, and partially-filled tanks create free surface effects that reduce GM. OOWs should understand these basic stability principles even on smaller vessels without a dedicated loading computer.

Question 3

During a survey, watertight door seals in a transverse bulkhead below the waterline are found to be perished and not closing properly. As Master, what is the significance of this for the vessel's damage stability?

Accepted Answer

Significant — a failed watertight closure compromises the subdivision the vessel's damage stability calculations rely on, potentially allowing progressive flooding between compartments in the event of damage Damage stability calculations assume watertight subdivision functions as designed. A bulkhead door that cannot seal properly defeats that subdivision, allowing flooding to spread beyond the single compartment the design assumed — this must be rectified before further operation.