Abnormal noise from the outlet buffer tank of the vertical compressor

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During the commissioning of one of the company’s reciprocating compressors (vertical type), nitrogen was first used (20 kilograms) to pressurize the system and check for leaks; no abnormalities were detected, with everything such as the buffer tanks outside the compressor unit and the pipelines functioning normally. After hydrogen was introduced (with an exhaust pressure of 20 kilograms), unusual noises started to be heard from the buffer tank located behind the compressor unit. The noise resembled that of air flow pulses, and there was some vibration in the pipelines and buffer tanks, though it wasn’t severe. The vibration of the compressor unit itself was normal. Could anyone tell me what might be causing this? How to solve it! It was determined that there is no resonance (no disruption of the mechanical and meteorological balance, nor any abnormal noises), it is not a air hammer, and there is no liquid present (exit pressure: 20 kilograms, temperature: 60 degrees)