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One or Two pipe? Nice Radiator
Just inspected a vacant house with no utilities connected. The basement end of the steam system looks like a one pipe system with a pressuretrol, a converted snowman coal to oil boiler, and wet returns and individual main vents. But as shown in the photo there are two rather small pipes to each radiator. Does the low return valve operate as an orifice?
Note that there are no air vents on the radiators, and no noted extra traps, etc in the basement.
And does anyone in the NYC area need a ton or two of coal, remaining from an oil conversion many decades old?