Maritime Questions › Enclosed Space Entry

What is the minimum crew configuration required for a planned enclosed space entry under COSWP guidance?

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. A single person may enter alone provided they carry a personal gas monitor

B. The standby person may leave the entrance briefly to fetch equipment without affecting the permit's validity

C. At least one entrant, a dedicated attendant/standby person stationed at the entrance who does not enter, and a means of two-way communication between them

D. Two entrants is always sufficient with no one required to remain outside

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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