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water hammer or clanking in one pipe steam system
from experience... it doesn't have to be a long piece of pipe pitched the wrong way to make an awful racket. Look at all the pipes... also, the sound telegraphs throughout the system, making it harder to find. Check the level on all the horizontal (more or less!) runs -- every single one -- and get them pitched right. Bet it'll stop making noises.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch