What is the danger of carrying out hot work on one side of a bulkhead, deck, or pipe without checking what is on the other side?

A. This is only a concern for pipework, not bulkheads or decks

B. There is no risk as long as the visible side is confirmed safe

C. Conducted heat is never sufficient to ignite anything on the far side of structural steel

D. Heat conducts through steel; the unseen side may contain flammable cargo, fuel, insulation, or coatings that can ignite or be damaged even though no direct flame touches it

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