Recovery & Recycling第 217 / 240 题

How often must a refillable recovery cylinder undergo a hydrostatic test to remain legal for use?

a.Every five years
b.Every year
c.Every ten years
d.Only once when new

解析

A refillable DOT recovery cylinder must be hydrostatically tested every five years, and the test date is stamped on the cylinder. Using a cylinder past its test date is unsafe and not permitted. Always confirm the test date before filling.

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