Maritime Questions › Enclosed Space Entry

The revised recommendations introduce specific new sub-sections addressing hazards from certain cargo types. Which of the following groups of cargoes is specifically highlighted (para. 10.3.3) as having caused fatalities through fire, explosion or asphyxiation in enclosed spaces?

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. Coal, wood products/chips/pellets, metal sulfide concentrates, ferrous materials, seed cake cargoes, scrap metal, and certain grain/timber cargoes

B. Only liquefied gases carried under the IGC Code

C. Only IMDG Code Class 1 explosives

D. Refrigerated cargoes carried in reefer containers only

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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