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The King Of All Crossover Traps!
This is the Roland Park Condominium in north Baltimore, built in the 1920s. The first pic is the impressive front view. Look thru the archway and you can see the rear section of the building in the distance.
This system is currently a vacuum-return setup with mostly Trane traps, but was originally a Kreibel. We found and identified some of the old hardware. The boiler room is in the rear- currently housing two Weil-McLain 10-88s, and the original Smith Twin Tubular coal-converted unit that is abandoned in place. The original boiler also heated a garage in the rear of the building, but those lines have been disconnected since we now have automotive antifreeze.
We started working on this system a few months ago. Today's job was to vent the steam main- some 270 feet of 10-inch pipe running to the front of the building thru a tunnel-like hallway.