What is the primary purpose of lockout/tagout procedures before servicing shipboard machinery?

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Lockout/tagout procedures focus on safety by ensuring that equipment cannot start up or release stored energy while it’s being serviced. The idea is to isolate every energy source—electrical, hydraulic, pneumatic, mechanical, and others—then physically secure the control with a lock and affix a tag to indicate maintenance is in progress. Before work begins, the system is verified to be at zero energy, and it remains in that safe state until the lock and tag are removed after the work is finished. This prevents unexpected energization and the sudden release of stored energy, which could cause serious injury to personnel. On a ship, where machinery often involves multiple energy systems and cramped spaces, this safety step is essential for protecting the crew. Other choices don’t address the core safety purpose of stopping energization and stored-energy release during maintenance.