Maritime Questions › Enclosed Space Entry

A vessel is mid-ocean, several days from the nearest port, when an enclosed space casualty occurs. Beyond shipboard first aid, what additional resource should be used to support ongoing casualty management?

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. Telemedical Assistance Service (TMAS) for remote doctor guidance, alongside considering deviation/diversion if the casualty's condition warrants it

B. Only the ship's medical guide should be consulted, with no outside contact

C. No additional resource is available or required once the casualty is stable

D. Wait until the next scheduled port call regardless of the casualty's condition

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

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

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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