When H2S has been encountered on a MODU, or is anticipated, monitoring devices must sound an alarm (which differs from the lower concentration alarm) or otherwise warn employees when concentration of H2S reaches or exceeds how many parts per million?
• Hydrogen sulfide (H2S) exposure limits on offshore drilling units (MODUs) • Difference between a low-level warning alarm and a high-level evacuation/emergency alarm • Relevant requirements in 46 CFR and offshore safety standards for toxic gas monitoring
• Think about which concentration would represent a serious, immediate danger that requires urgent action, not just increased awareness. • Consider typical occupational exposure limits: which range is used for brief, emergency exposure rather than an 8‑hour workday limit? • Ask yourself: at what level would regulations likely require an alarm that clearly signals workers to take protective measures or evacuate?
• Compare the answer choices with known short‑term exposure or ceiling limits for H2S in industrial safety references. • Distinguish between a continuous monitoring/awareness level and a critical alarm level that triggers strong action. • Verify in current regulations (46 CFR or related offshore standards) what level is tied to emergency alarms on MODUs handling H2S.
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