Regulations & SafetyQuestion 57 of 240
DOT-approved refillable refrigerant cylinders generally must undergo hydrostatic testing (requalification) at what interval?
a.They never need retesting
b.Every 6 months
c.Every 20 years
d.Every 5 years
Explanation
Refillable DOT cylinders generally must be hydrostatically tested, or requalified, every 5 years to confirm they can safely hold pressure, and the test date is stamped on the cylinder. Testing every 6 months is unnecessary, 20 years is far too long, and cylinders do require periodic retesting. A cylinder past its test date should not be filled or transported until requalified.
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