Regarding the issue of periodic vibration in the water ring pump used for hydrogen extraction

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In the sodium chlorate off-gas treatment section, there are two XE520 water ring pumps, A and B, connected in parallel to draw hydrogen from the electrolysis system. Pump A experiences periodic vibrations; each vibration lasts for about 1 minute on average, with a minimum duration of 20 seconds. The interval between two consecutive vibrations is around 1 minute. During these vibrations, the motor current of pump A increases while the outlet pressure decreases. Meanwhile, pump B does not experience any vibrations, and its motor current decreases when pump A is vibrating When the outlet pressure drops and the vibration of pump A stops, its motor current decreases; the outlet pressure then rises until it stabilizes. The motor current of pump B also increases, and the outlet pressure rises until it stabilizes. I would appreciate some advice from experts! What methods can be used to eliminate the periodic vibration in water ring pump A? I’m begging for an answer!