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Steam condensate return humming/vibrating
I have a 1.6mbtu steam system that has a condensate return system that is humming very loudly in certain units. Building is an older brick structure. Stand up cast iron radiators. Steam rises up to attic and drops down to each unit, enters radiators through a standard angle stop. Each radiator has a mepco steam trap. the resonance/vibrating is happening on a couple stacks and appears to be coming from the condensate return system. We've replaced a few angle stops and steam traps and that appeared to have stopped the issue. Day later we are getting the same vibration/resonance. Any help would be appreciated.