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Requirements vary by operation, so the first compliance question is not "what does OSHA require" but "which part of OSHA governs this site". A facility doing more than one of these is governed by more than one.
Each class has a different control, and each is named in the article. Three of the four are addressed by installed infrastructure rather than by procedure.
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In a plant, a fall ends on the floor. In a marine environment it can end in open water, a cargo hold, confined machinery, or an active operational zone — and emergency response is harder to reach in all four.
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Because these are high-risk environments, OSHA expects proactive and well-documented programmes that demonstrate consistent hazard mitigation — not a response assembled after an incident.
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