Class 4 (4th Engineer) SC&S 📅 Jun 2024

Exam Question

A vessel about to complete loading in a summer zone is expected to enter a winter zone after steaming from the loading port for 10 days. On passage, fuel consumption is expected to be 30 tonnes per day and water consumption 15 tonnes per day. The ship is at present floating in water of density 1.013 tonnes/m3 at a draft of 9.0m. (16)

Summer load draft: 9.475m

FWA: 203mm

TPC: 30 tonnes/cm

Find

(a) The maximum permissible draft on completion of loading.

(b) The amount of cargo which the vessel can load.

(Note: A vessel passing from a summer zone to a winter zone, or from a tropical zone to summer zone, must arrive at the zone boundary at the draft appropriate to that zone).

Reference Answer

### Principle
The governing principle for this calculation is derived from the International Convention on Load Lines, 1966. Regulation 10 states that a vessel transiting between zones must be loaded such that it arrives at the boundary of the new zone at a draft not exceeding the maximum permissible draft for that zone.
Therefore, the calculation must work backward from the required arrival condition (Winter draft at the zone boundary) to determine the maximum permissible departure draft from the loading port. This departure draft must account for all weight changes during the voyage (fuel and water consumption) and the difference in water density between the salt water for which load lines are calculated and the dock water at the loading port.
### Solution

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