The safety discs on carbon dioxide cylinders are set to release at 2,700 psi. Under normal circumstances this pressure will be reached at a temperature of __________.

Correct Answer: Option D — 135°F

Per 46 CFR and DOT regulations governing compressed gas cylinders, safety relief discs on CO2 cylinders are engineered to rupture at 2,700 psi, a pressure attained when internal temperatures reach 135°F due to liquid expansion.