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I'm very new to steam heat (just moved from the south), but am learning the various pieces, but I discovered a set of surge canisters on one steam leg main of my system. This particular leg is having trouble heating all the radiators, but wanted to get some background on why it's even there in the first place. I will say, this main crosses a door way, and makes a 90 degree up and another 90 degree over to clear the door height before retuning to its original height, then into the surge canisters about 15ft away, and then onto the F&T trap at the end. Thanks.