- If hot work is to be undertaken on the open deck, cargo and slop tanks within a radius of at least 30 metres around the working area must be cleaned and hydrocarbon vapour content reduced to less than 1% by volume and inerted.
- All other cargo tanks in the cargo area must be inerted with openings closed.
- Adjacent ballast tanks, and compartments other than cargo tanks, should be checked to ensure they are gas-free and safe for hot work. If found to be contaminated by hydrocarbon liquid or vapours they should be cleaned and gas freed.
- On a vessel without an inert gas system all cargo tanks except those containing slops, must be cleaned and freed of hydrocarbon vapour to less than 1% LFL.
- Tanks containing slops should be kept closed and be beyond 30 metres from the work area.
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