🔍 Key Concepts

• How cargo tank valves are operated on modern tank vessels • Advantages and disadvantages of hydraulic, electric, steam, and diesel systems for valve control • Safety and reliability requirements for power systems in potentially explosive cargo tank areas

💭 Think About

• Which of these power systems can be located safely away from the cargo tank area while still operating valves remotely? • Which system is generally preferred in hazardous or explosive atmospheres where electrical sparking must be minimized? • Think about which systems give smooth, controllable movement and are common on other remotely operated shipboard equipment (like steering gear or hatch covers).

✅ Before You Answer

• Eliminate any options that would create obvious ignition hazards near flammable cargo vapors. • Consider which systems would be impractical or bulky for operating many valves across multiple tanks. • Recall from your tank vessel operations study which type of power is most often mentioned with remote-operated cargo valves.