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Posted by Kevin on November 11, 2011 at 13:26:37:
Background:
I have a 112-year-old, 6-unit building with a young Weil-Mclain LGB-8 (series 2) steam boiler serving approximately 45 single-pipe radiators throughout the building. Of these radiators, approximately 10 are currently disconnected due to renovations. All pipes are original, as are 95% of the radiators. I recently replaced the four main vents near the boiler, and I have replaced at least 12 of vents on various radiators. I have also replaced at least 12 radiator valves. Within the last week, I drained the low-water cut-off valve for the first time in a month.
Problem:
There are 1-2 large (12-fin) original radiators in each unit. Most, if not all, of these radiators will sound as-if they are filling with water (I hear a sloshing sound), and at some point during the cycle, their vents will rattle and spit water. None of the other, smaller radiators have this problem--nor any other symptoms. I checked the pitch of one of these large radiators last night and it was appropriately pitched backwards towards the source.