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Flooding problem! - Two pipe air vent system
Beautiful old building in Marblehead MA with 2-pipe air vent steam system.Complaint by customer flooding system water coming out of 2nd floor radiator vents and packing nuts.
System has worked without problems until past 2 years when flooding has gotten worse.
I was there last week to checks things out. They had drained system back to normal level and with several eyewitness accounts (no two stories were the same)I had to try and do some investigating with little to go by. It seemed like the pump controller could be the culprit.(Recently had the float assembly replaced) the system had flooded after that repair. I dropped the level of the boiler through a drain and watched the function of the pump controller and it seemed to be working bringing the pump and off and the level of the boiler gong up and down as it should. I had no solution at this time. I told the customer to keep an eye on it when and let me know.
I've have sketched out and attached a simplified drawing of piping and components.
Last call from customer described the following scenario:
No call for heat. Possibly ran 4 or 5 days before.(No one is sure)
Water 2nd floor spitting water out vents
Water 2nd floor dripping from packing nuts on steam hand valves
Boiler level above sight glass
Receiver tank level above sight glass
Receiver pump running
Condensate pump on running.
No water coming out of either condensate or receiver vent pipes.
Customer shut off condensate pump switch:
Water pouring out of condensate vent pipe
Receiver pump stops pumping.
Looking for help.