Hydrogen sulfide in explosive concentrations has been detected on the drill floor and the abandon rig signal has been sounded. Which of the following would be the safest way to evacuate?
• Windward vs. leeward sides relative to wind direction and gas movement • Behavior of hydrogen sulfide gas (heavier or lighter than air, how it disperses) • Purpose and location of survival capsules and liferafts on an offshore rig
• If a toxic, potentially explosive gas is present on the rig, in which direction will the wind carry that gas? • Which side of the rig (windward or leeward) will generally have cleaner air when a gas cloud is present? • In an emergency evacuation, is it safer to launch into or away from the path of the gas cloud?
• Identify which side of the rig is upwind (windward) and which is downwind (leeward). • Consider that hydrogen sulfide is heavier than air and tends to collect and move with the wind near the surface. • Verify which option(s) focus on using only the downwind/leeward evacuation resources, away from the gas cloud.
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