What ventilation requirement applies specifically to hot work carried out inside an enclosed or confined space?

A. Natural ventilation through the access hatch alone is always sufficient

B. Ventilation is not required if the worker wears a respirator

C. Ventilation requirements only apply to spaces below the waterline

D. Adequate mechanical/forced ventilation must be provided and maintained throughout, to remove welding fumes, heat, and any flammable vapour, in addition to all standard enclosed space entry precautions

A. Any task lasting longer than 30 minutes

B. Only welding using electric arc equipment

C. Any work involving an open flame, welding, burning, grinding, or any process that produces sufficient heat or sparks to act as a source of ignition for flammable materials, gases, or vapours

D. Only work carried out inside a cargo tank

A. A clear radius of at least 10 metres (or as defined by the risk assessment for the specific task and materials), with all combustibles removed or adequately shielded

B. No clearance is needed if a fire extinguisher is present

C. Clearance is only relevant for work carried out in an engine room

D. 1 metre is always sufficient regardless of the work type