🔍 Key Concepts

• MODU (Mobile Offshore Drilling Unit) operating environment and blowout risks • How diesel engines can be affected by explosive or gas‑saturated atmospheres • Different methods of stopping a diesel engine: air, fuel, speed, or water injection

💭 Think About

• If a blowout releases gas into the engine room or intake area, how might that affect a diesel engine’s speed and controllability? • Which type of shutdown will still be effective if the engine begins to run on combustible vapors in the intake air instead of just its own fuel supply? • Think about which device is specifically intended to protect against an engine running away (overspeed) due to external fuel sources.

✅ Before You Answer

• Identify which option would still work even if the normal fuel system is no longer controlling the engine • Determine which device is commonly associated with runaway diesel protection in gas‑rich atmospheres, such as offshore installations • Eliminate any options that mainly affect normal fuel metering rather than stopping an engine fed by flammable intake gases