Hydraulic accumulator capacity: definition State how the capacity of a hydraulic accumulator is specified in design and selection. Choose the correct definition.

Concept

• A hydraulic accumulator stores energy in the form of pressurised fluid (via weight, spring, or gas precharge).

Definition
Its capacity is specified as the maximum energy that can be stored and made available between two pressure limits.For a gas-charged accumulator, energy ≈ ∫ p dV over the usable pressure range; for a weight-loaded type, ≈ average pressure × volume change.

Common pitfall
Equating capacity with volume only. Volume matters, but capacity is fundamentally the energy deliverable.

Final Answer
Maximum amount of energy stored.