After a bulk carrier completes loading in a Brazilian iron ore port, you are tasked with carrying out a pre-departure inspection of the cargo holds. Describe where to look and what defects you are specifically looking for.

A. CARGO HOLD PRE-DEPARTURE INSPECTION — KEY AREAS AND DEFECTS: TANK TOP AND INNER BOTTOM: (a) Cracks or indentations in tank top plating from grab or bulldozer damage; (b) Paint condition — loss of protective coating accelerates corrosion; (c) Drainage — tank top drain plugs in place and secured; (d) Bilge strum boxes — clear and accessible. TRANSVERSE BULKHEADS AND FRAMES: (a) Bracket toes (lower connections of web frames to tank top) — most common fatigue crack location in bulk carriers; (b) Corrugated bulkhead lower stools — check for cracking at the stool shelf plate connection; (c) Pitting corrosion on transverse bulkheads. HATCH COAMINGS AND HATCH COVER SUPPORT PADS: (a) Distortion of coamings from grabbing; (b) Rubber seal condition and compression — damaged seals = weathertightness failure; (c) Drain channels clear of debris. LONGITUDINAL STRUCTURE: (a) Side shell frames and brackets — look for buckling in upper wing tanks; (b) Hoppers — corrosion pitting (most severe in lower hopper knuckle, hidden area). REPORTING: defects found → log in ship's Defect Reporting system → notify master → notify DPA → classification society notification if structural (IACS UR S18 criteria).

B. Inspect only the hatch covers for watertightness. Internal hold structure is inspected by classification society surveyors and is not the OOW's responsibility.

C. Walk around the hatch perimeter and check the cargo surface is level. Structural inspection requires special climbing equipment and is done only in dry dock.

D. Check the hold ventilation fans and lighting. Structural checks are the chief mate's responsibility and should not be conducted by the OOW.

A. HATCH COVER WEATHERTIGHTNESS TESTING — THREE METHODS: (1) CHALK AND STRAIGHT EDGE TEST: apply chalk to the seating/compression bar around the hatch coaming; close the hatch and then open it — check where chalk has transferred to the rubber seal. Chalk marks show contact; gaps without chalk marks indicate poor seal compression. Fast and simple. (2) HOSE TEST (WATER SPRAY): aim a fire hose jet at the hatch cover perimeter seals from a standardised distance — typically 1 metre at 30 psi. An observer checks inside the hold for any water ingress. This is the standard weathertightness test required under SOLAS (MSC/Circ.860). Record locations of any leaks. (3) ULTRASONIC TEST: an ultrasonic transmitter is placed inside the closed hold and a detector is used outside along the seal. The detector signals increased ultrasonic transmission at any gap — more sensitive than hose test and detects minor leaks. IICL and IACS recommend ultrasonic testing for ore carriers and container ships where full water testing is impractical. AFTER TESTING: any failed seals → replace rubber or adjust cleat compression before departure. Document test in the ship's records. P&I Club surveyors may witness testing for cargo claims protection. Hatch cover hydraulic rams and hinges → check for hydraulic leaks and proper operation.

B. Paint the hatch cover seals with red lead paint and close the hatch. Any areas where paint smears onto the coaming indicate a good seal. Areas without smearing are leaking.

C. Weathertightness testing is only required for chemical tankers. Bulk carrier hatch covers need only a visual inspection before sea passage.

D. Test by closing all hatches and flooding the deck with a fire hose over the entire top surface. If no water appears in the holds after 30 minutes, the hatches are watertight.

A. BALLAST TANK ENTRY AND INSPECTION — SAFE PROCEDURE: ENCLOSED SPACE PRECAUTIONS FIRST: double bottom ballast tanks are enclosed spaces. Mandatory process: (1) Confirm tank is empty and vented for minimum 24 hours (or forced ventilated); (2) Test atmosphere: O2 18.5-23.5%, HC <1% LFL, toxic gases (H2S, CO) below TLV; (3) Obtain permit to work; (4) Post observer/standby at tank entrance; (5) Wear appropriate PPE and carry personal gas detector; (6) Establish communication and rescue plan. STRUCTURAL DEFECTS TO LOOK FOR: (a) CORROSION PITTING: especially at the bottom of the tank floor plating — measure pitting depth with pit gauge; (b) CRACKS: in welds along longitudinals, transverses, and where floors meet shell frames; (c) COATING BREAKDOWN: bare metal areas accelerate pitting; (d) ANODE CONDITION: zinc or aluminium sacrificial anodes — if more than 75% consumed, flag for replacement; (e) WELD CRACKING: at intersections (connections between floors and longitudinals are highest stress points); (f) STIFFENER BUCKLING: longitudinal stiffeners buckling under compressive loads; (g) SUCTION PIPE AND VALVE CONNECTIONS: check for cracks at pipe penetrations. REPORTING: record all findings in tank inspection report form → chief mate → DPA → class society if structural crack found.

B. Descend into the tank immediately after deballasting while it is still accessible from the open manhole. The 3-hour wait since deballasting is sufficient for ventilation.

C. Ballast tank inspections can only be conducted by class surveyors at the dry dock — crew entry is not permitted and is not part of OOW duties.

D. Look only at the tank coating. Structural cracks require specialist equipment to detect and should only be reported if visible without close inspection.