Class 4 (4th Engineer) SC&S 📅 Apr 2025

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.

Summer load draft	9.475m
FWA	203mm
TPC	30 tonnes/cm

(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 of Calculation
The governing principle, as stated in the question, is that a vessel must arrive at a new load line zone boundary at a draft not exceeding the maximum permissible draft for that zone. In this case, the vessel is transiting from a Summer Zone to a Winter Zone. Therefore, upon arrival at the Winter Zone boundary, its draft must be equal to or less than the Winter Load Draft.
The calculation proceeds by working backward from this arrival condition. The required arrival draft (Winter Draft) is determined first. Then, an allowance is made for the fuel and water that will be consumed during the 10-day passage, which will lighten the vessel and reduce its draft. This establishes the maximum permissible draft the vessel can have upon departure from the loading port, expressed in Salt Water (SW). Finally, this departure draft is adjusted for the actual density of the water at the loading port (Dock Water) to find the maximum observable draft on the ship's side upon completion of loading.
### Part (a): Maximum Permissible Draft on Completion of Loading

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