CHIEF ENGINEER Unit 15 Periodical Dry Docking Q3 Answer

  1. With reference to the periodical dry-docking of a vessel:
    (a) list FIVE precautions that should be undertaken before the vessel enters the dock;(5)
    (b) list FIVE inspections/precautions that should be undertaken before re-flooding the dock.(5)

(a) Five precautions before the vessel enters the dock (5 marks)

  1. Trim and stability adjusted – vessel trimmed slightly by stern, stability verified within safe limits.
  2. Tanks and bilges prepared – ballast, fuel, and water levels reduced or distributed as per dockmaster’s instructions.
  3. Sea suctions, overboard valves, and stern tube glands checked – ensure all are shut and in good condition.
  4. Loose gear secured – deck cargo, stores, and equipment properly lashed to prevent movement.
  5. Fire and emergency equipment available – fire pumps and hoses ready, crew briefed for docking operations.

(b) Five inspections/precautions before re-flooding the dock (5 marks)

  1. All underwater work completed – inspection of hull plating, rudder, propeller, sea chests, and fittings finished.
  2. All openings closed – sea chests, sea valves, manholes, and drain plugs refitted and tested tight.
  3. Dock blocks and shores checked – ensure no tools, equipment, or debris remain under vessel.
  4. Safety of personnel ensured – dock workers and ship’s crew clear of underwater areas before flooding.
  5. Communication established with dockmaster – coordinated flooding procedure agreed and emergency plan in place.