Maritime Questions › Enclosed Space Entry

SOLAS III/19 requires enclosed space entry and rescue drills to be conducted at what minimum frequency?

Q: Under MSC.581(110), what is the maximum acceptable CO2 reading (by volume) before an enclosed space can be considered safe for entry?

Less than 0.5% by volume (5,000 ppm) Para. 7.4 sets the CO2 exposure limit at below 0.5% by volume (5,000 ppm) before entry; if this is not achieved, the space remains unsafe. CO2 is now explicitly addressed as a major asphyxiation hazard alongside oxygen depletion.

A. Only before the first entry of a new crew member

B. At least once every two months, with every crew member with enclosed space entry or rescue duties participating in a drill at least once every two months

C. There is no SOLAS requirement for drills, only for equipment

D. Once per year

Under MSC.581(110), what is the maximum acceptable CO2 reading (by volume) before an enclosed space can be considered safe for entry?

A. Less than 0.5% by volume (5,000 ppm)

B. Less than 2% by volume

C. Less than 21% by volume

D. There is no specific CO2 limit, only an oxygen limit

Under the revised recommendations, is single-person entry into an enclosed space ever permitted?

A. Yes, provided the person carries a personal gas detector

B. No — the company must ensure single-person entry into an enclosed space is not permitted

C. Yes, for spaces that have previously tested safe within the last 24 hours

D. Yes, but only for spaces below 5 metres in depth

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