INFLUENCE OF TEMPERATURE ON NITROGEN INFLATION PRESSURE IN HYDRAULIC ACCUMULATORS
GENERALITY
In order for it to work, each hydraulic accumulator must have inside the bag or membrane or part of the cylinder in the accumulators with piston inflated to a pressure determined by the formulas performed for the various applications. The inflation pressure must be determined in order to avoid the complete discharge of the accumulator during the work cycle. generally this is set at 90% of the minimum operating pressure and in no case less than 1/5 of the maximum circuit pressure. Commercial hydraulic nitrogen is used in all hydraulic accumulators for their pre-charge. Why use nitrogen: Nitrogen is an inert non-flammable gas with a good sealing capacity on the gaskets and therefore a good duration of the preload. Low cost. Can other inert gases be used? in theory yes, but they have the drawback of a poor duration of the preload value.
IT IS STRICTLY FORBIDDEN TO USE AIR OR OXYGEN. EXPLOSION HAZARD !!
USES WITH DIFFERENTIATED OIL REQUESTS
In hydraulic accumulators, the change in temperature that occurs in the system is a factor to be taken into account for the duration of the accumulator itself and its operation. if the system is subjected to a temperature variation, it is necessary to take it into account for the correct calculation of the preload. In the calculations there is the value P1 which corresponds to the value maximum precharge pressure at maximum working temperature. It is therefore necessary to make a change in the inflation pressure according to the temperature at which the pre-charge is carried out. Generally the inflation temperature at 20 ° is considered, the pre-charge pressure P0 at 20 ° C will be P0 = 0.9 P1 x 273 + 20 = 293/273 + Maximum working temperature
REDUCTION OF FAST APPROACHING TIMES
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The hydraulic accumulators is an essential component for the optimum operation of a hydrauliccircuit. In hydraulic circuits, theaccumulator enables:
Energy Storage: saves energy withoutloss and redistributes when required therefore reducing installed power.
Pressure compensation: absorbs pressure spikesfrom pumps or other components to control pressure and flow-rates in ahydraulic circuit.
VolumeControl: absorbs fluid volume variations induced by temperaturechanges in a closed hydraulic circuit and maintains a rated pressure.
MaintainsFluid Flow Rate: an accumulator can maintain the fluid flowrate in case of pump failure and can also be used as a mobile fluid reserveunder pressure.
Emergency EnergyStorage: in case of failure of the main energy source, an accumulator canprovide sufficient energy to complete an operation or to realize a fullhydraulic cycle.
Preventsmixing of fluids: Transfer of energy from a fluid to anotherfluid without any risk of mixing.
Shock absorber: suppresses shocks andvibrations in hydraulic systems of lifting vehicles (e.g. Forklift trucks) andmaintains real suspension of the load on a gas spring.
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COMER ACCUMULATOR SERVICE CENTER
From 2019 COMER is officially the Parker / olaer Accumulators service center. Comer has all the appropriate equipment and large spare parts warehouse to perform checks on the preloads, internal bag replacements and interventions in general on the whole range of accumulators in production both Parker and Olaer.