Maritime Questions › Enclosed Space Entry

Under SOLAS XI-1/7 as reinforced by MSC.581(110) para 7.3, what is the minimum number of sets of portable gas detection equipment a ship must carry, and when must this increase?

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. At least two sets as a baseline; ships carrying cargoes capable of generating hazardous vapour that require regular enclosed-space entry must carry two additional sets

B. One set is sufficient provided it is recalibrated weekly

C. Four sets minimum on all vessels regardless of cargo type

D. The number is left entirely to the company's own risk assessment with no SOLAS minimum

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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