What would be a major consequence of allowing the refrigeration system of a low pressure fixed CO2 fire extinguishing system to remain inoperable?

Correct Answer: Option D — The entire charge may eventually be lost due to CO2 boil-off venting through the relief valve.

Low-pressure CO2 receivers rely on refrigeration units to maintain internal storage temperatures near 0°F and pressures around 300 psi. Inoperable refrigeration leads to ambient heat absorption, vapor pressure increase, and continuous venting through safety relief valves until the entire charge is depleted.