A very common question asked by people in the fluid power industry is: How often should pre-charge maintenance be done for hydraulic accumulators. Typically, nitrogen gas is used as the medium for pre-charge due to the fact that its properties are close to those of an inert gas but it is not a true inert gas. There is an inherent problem with loss of pre-charge gas pressure, primarily due to permeation of nitrogen gas through a rubber bladder or a diaphragm membrane into the system fluid. This loss of pressure must be replenished to ensure optimum performance of the accumulator and avoid any premature failure of the accumulator. The maintenance interval of pre-charge pressure depends on several factors that should be considered.
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