| abstract |
An object of the present invention is to appropriately manage the life of an accumulator and to extend the life of the accumulator. In a gas supply system 2, in order to determine the lifetime of the pressure accumulators 61 to 63 based on the number of acquired stress amplitudes of the pressure accumulators 61 to 63, a control unit 10 includes an acquisition unit 10a, a classification unit 10b, And a determination unit 10c. The acquisition unit 10a obtains the pressure accumulators 61 to 61 from the differential pressure between the first pressure when the first valve member 81 on the gas storage side is closed and the second pressure when the second valve member 82 on the gas outlet side is closed. A stress amplitude of 63 is obtained. The classification unit 10b classifies the stress amplitude into a plurality of groups. The determination unit 10c counts the number of acquired stress amplitudes ni for each group, then divides the number of acquired stress amplitudes ni by a predetermined number of fracture repetitions Ni, and calculates the sum of ni / Ni for each group obtained above. The degree of fatigue Σni / Ni is obtained. When the value of the degree of fatigue Σni / Ni is equal to or greater than a predetermined threshold, the determination unit 10c determines that the lifetime of the pressure accumulator is reached. [Selection] Figure 1 |