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I have a 1 pipe steam system with f&t traps and main vents at the end of 3 loops. The system has a condensate pump. The system works ok. There is some trouble with getting heat to a couple of the radiators, and some water being spit out of a first floor radiator. I have several questions.
1) we had another radiator added to the end of the loop with the spitting radiator. It is closest to the trap and I believe the water is not being drained fast enough to prevent it being carried to the radiator air vent. What is the best way to solve this? Change the diameter of the return pipe?
2) main vents with f&t seem redundant. The f&t I would expect to do some venting. Would it be better to install riser vents just before the highest furthest radiator in that loop? Is there a valve that could be installed to replace the radiator shutoff valve that would accommodate a riser vent?
3) my boiler is an American boiler Vintage 1960. It seems to be working fine. Replace? I have no one close. Already looked on this website. I think I’m going to have to tackle it myself.