Regulations & Safety第 72 / 240 题
A technician notices a disposable refrigerant cylinder labeled 'DOT-39.' What does this designation mean for handling?
a.It must be hydrostatically retested every 5 years
b.It may be refilled up to five times
c.It is a single-use, non-refillable cylinder that must never be refilled
d.It can be pressurized higher than a refillable cylinder
解析
A DOT-39 cylinder is a single-use, non-refillable container, so it must never be refilled with recovered or virgin refrigerant. It is not requalified like a refillable DOT cylinder and refilling it is both dangerous and illegal. After the refrigerant heel is recovered, the empty cylinder should be disposed of according to local rules.
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