Abstract
Asecond compact accumulator is in use because a leakage occurred in the largewelded bellows of the original accumulatorin 2010. However, the present accumulator has the drawbacks, includinga lower pressure tolerance and large hysteresis duringexpansion and contraction, which can decrease the number of cycles to failure.In response, we developed new welded bellows with a pressuretolerance of 2.0MPa and a hysteresis-free accumulator with a levelness accuracy of less than 1°.This accumulator has been confirmed through its commissioning to meet design requirements.
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