A hydraulic accumulator is pre-charged with nitrogen to 1000 psi. The hydraulic system is then pressurised to its operating pressure of 3000 psi. What is the indicated pressure on the nitrogen side of the accumulator?
Refer to figure.
An accumulator is fitted to store hydraulic fluid under pressure, dampen pressure fluctuations, allow for thermal expansion and provide an emergency supply of fluid to the system in the event of a pump failure.
The gas side of the accumulator is charged to a predetermined pressure with air or nitrogen. As the accumulator is fitted and the hydraulic pressure in the system builds up, the gas in the accumulator will be compressed until fluid and gas pressures equalize at normal system pressure. That is why the accumulator gauge will read 3000 psi, the same as the hydraulic system is pressurized to.
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