A DOT-approved refrigerant recovery cylinder must be periodically retested for safety. What is the standard hydrostatic retest interval for these cylinders?
a.Every 5 years
b.Every 2 years
c.They never require retesting
d.Every 12 months
解析
DOT refrigerant recovery cylinders must be hydrostatically retested every 5 years to confirm they can safely hold pressure. A cylinder past its test date should not be filled until it is retested. This helps prevent ruptures from corrosion or fatigue over time.
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