TFM-04 Fire Extinguisher License – A (FEL-A) Practice Test

DOT containers must be tested at least every how many years before recharging?

1 year 3 years 5 years 10 years

Correct Answer:

5 years

Explanation:

Hydrostatic testing checks the cylinder’s ability to safely handle pressure after years of use. For DOT containers used on portable extinguishers, the standard requalification interval is five years. This test subjects the cylinder to a higher-than-service pressure to look for hidden flaws like cracks or corrosion, and only a cylinder that passes is considered safe to recharge. If it fails, the container must be retired or repaired according to regulations. Other intervals aren’t the typical requalification period for these DOT containers, so five years is the best answer.

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