🔍 Key Concepts

• Difference between storing energy vs. creating pressure in a hydraulic system • Typical components in a hydraulic starting system (pump, reservoir, cylinder, energy‑storage device) • What device uses compressed gas and hydraulic fluid together to hold pressure

💭 Think About

• Which component’s main job is to hold pressure over time so it is instantly available for starting, rather than just supplying fluid volume? • Think about a fire main or steering gear: what is the name of the unit that keeps hydraulic pressure available even when the pump is not running? • Look at each option: which one usually just stores fluid, which one creates pressure, and which one is known as an energy‑storage device in hydraulic systems?

✅ Before You Answer

• Identify which choice is commonly defined as a hydraulic energy‑storage device in marine engineering texts • Eliminate any option whose normal function is mainly to move or contain fluid but not to store pressurized energy • Recall that in many shipboard hydraulic systems, the device often has a gas charge (usually nitrogen) on one side and hydraulic fluid on the other side, separated by a bladder, piston, or diaphragm