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Curious about the length of the main and placement of the vent
I am curious Of a couple of aspects to the length of our main steam pipes. When we moved in a year ago there was an ancient Arcoliner steam boiler heating the house. The main formed a nearly square layout and is around 60 feet. I noticed that most of the homes in our street are steam heat also. Upon checking a neighbor’s setup, the length of the main was much smaller. I also noticed their vent is on the return end near the boiler where as ours is opposite of the boiler/ halfway along the main. I’m not sure why a main vent would be anywhere else but the end by the boiler. Also, is there an reason why a main would be tighter loop? The houses both date from the late 1920’s. They would have been oil fired boilers right? We recently had our boiler replace and the oil tank removed. I wondered if the Arcoliner was the original boiler or perhaps there was a coal fired boiler. Just wondering if anyone has some guesses and to what the dead guy was thinking how original installed our steam system.