What is the primary safety objective of a purge line when performing maintenance on shipboard equipment in a gas-free environment?

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The main idea is to make the space safe to breathe before you open it for work. A purge line pushes out and dilutes any hazardous fumes or vapors trapped in the equipment or ducting, so the atmosphere becomes safe for workers to enter. By displacing contaminated air with purge gas (often inert gas), you lower the risk of inhalation of toxic or flammable gases and reduce ignition hazards when you access the equipment. While flooding with purge gas is part of the process, the essential objective is creating a breathable, nonhazardous environment prior to opening to air. Post-maintenance leak checks are important, but they come after the purge has established a safe atmosphere. Venting exhaust into the open atmosphere during purging could spread hazards, so the goal is to purge and contain contaminants, not simply vent them.