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CHAPTER ACCUMULATORS 15.0 TABLE OF CONTENTS 15.1 INTRODUCTION 1 15.2 FAILURE MODES 3 15.3 FAILURE RATE MODEL 4 15.3.1 Seals 5 15.3.2 Springs 5 15.3.3 Piston and Cylinder 5 15.3.4 Valves 6 15.3.5 Structural Considerations 6 15.4 THIN WALL CYLINDERS 7 15.5 THICK WALL CYLINDERS 10 15.6 FAILURE RATE CALCULATIONS 11 15.7 REFERENCES 13 15.1 INTRODUCTION A hydraulic accumulator is a device designed to store energy. In a hydraulic system, fluid is pumped into the accumulator through a one-way valve. The accumulator holds the energy under pressure using a spring, compressed gas or raised weight which is used to exert a force against an incompressible fluid. The accumulator also has an output valve that is opened upon demand to supply fluid to other components of the system. An accumulator is used to store energy in such applications as: Fluid supply System pressure surge damping and shock suppression Stabilization of pressure fluctuations Leakage and thermal expansion compensation Emergency and standby power source An accumulator is also used to smooth out the delivery flow of pumps. The pump may deliver the required power to the system in a pulsating flow which can produce Accumulators 15-1 Revision B

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