Deck : Deck General - 1389/5076
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| Which statement about entering into a tank which has been sealed for a long time is TRUE? |
| A) The tank need not be tested for oxygen content if it is ventilated for more than 24 hours. |
| B) The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated. |
| C) If the oxygen content tests at less than 12% you should wear an approved gas mask. |
| D) The tank should be tested only once to ensure the oxygen content is at least 14% before entry. |
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