A hydro-pneumatic accumulator must be filled with dry inert gas, such as nitrogen gas, while no fluid is in the chamber. The pre-charge level of the gas medium is an essential parameter for the gas accumulator since the pre-charge pressure, along with the accumulator volume, determines the maximum amount of hydraulic energy that can be stored in it. In general, a gas accumulator is pre-charged to a certain percentage of the minimum system pressure, depending upon the type of accumulator and application, and usually as per the manufacturer’s recommendation.
For energy storage applications, the pre-charge pressure can typically be 80 to 90% of the system’s minimum working (operating) pressure.
The pre-charge pressure for a pulsation compensator or a shock absorber can be 65 to 80 per cent of the minimum operating pressure.
Joji Parambath
Director
Fluidsys Training Centre Pvt Ltd
Bangalore, India
Amazon Author Page URL:
https://www.amazon.com/author/joji
Textbook on ‘Hydraulic Accumulators and Circuits in the SI Units’ (2nd Edition)
By Joji Parambath
The textbook presents information on the classification, constructional features, working and essential terms and definitions, sizing, and safety and maintenance aspects of hydraulic accumulators. The book uses the SI system of units.
Textbook on ‘Accumulators in Hydraulic Systems in the English Units’
By Joji Parambath
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