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Loud noise possibly Air Vent on Hoffman Differential loop
We have a customer complaining of loud noises coming from Steam Heating System. A brief description of system Weil Mclain EGH 85 gas fired steam boiler installed about 20 yrs ago, two pipe system with mostly C.I. Radiators and two pieces of baseboard each with radiator traps, Hoffman differential loop with Hoffman #75 vent installed on the top of the loop, pressure is controlled with a vaporstat set at 10oz. with a 6oz. differential, boiler installed so water line match's original water line, water line is stable throughout cycle and no makeup water was added during 45 minutes of operation, burner cycles on vaporstat properly. I was present when noise was heard but could not get to repeat. Sounded like the Hoffman steam vent was rattling or pounding. Unfortunately I was not close by when noise happened.
Steam vent seems to be working well venting air no steam or water venting. Suggestions?