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heating pipe near boiler hammering
hi..I get a lot of hammering sound coming from this section of the steam pipe (see attached photo). This is a one pipe heat steam system by the way. the return line has an 90 angle that is facing up, even though the return line has a pitch towards the boiler, i think that 90 angle facing up is preventing the water from flowing towards the boiler and that's causing the hammering sound....Please advise if my theory is correct.