A technician fills a DOT recovery cylinder with recovered R-22. To prevent a dangerous hydrostatic rupture, the cylinder must not be filled beyond what fraction of its capacity?
a.90% by volume
b.100% by weight
c.80% by weight
d.95% by weight
Explanation
A recovery cylinder must never be filled beyond 80% of its rated capacity by weight to leave room for liquid to expand as temperature rises. Overfilling can create extreme hydrostatic pressure and burst the cylinder. A scale should be used to weigh the charge and stop at the 80% limit.
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