Maritime Questions › Enclosed Space Entry

Are Emergency Escape Breathing Devices (EEBDs) an acceptable means of entering an enclosed space considered unsafe, provided the wearer intends only a brief inspection?

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. Yes, EEBDs may be used for entry as long as the space has previously been classified UNSAFE rather than unknown

B. Yes, provided the entry lasts under 10 minutes

C. Yes, but only if accompanied by a second EEBD-equipped attendant

D. No — para. 9.2 states EEBDs are not suitable for entry into enclosed spaces and must be used for escape purposes 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. 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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