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generic question about knocking radiators
I'm a homeowner and I've been given two stories about knocking radiators and I'd like to know which is true (or if both are true).
Basically, I'm trying to find out if my boiler is sending live steam or not as well as figuring out the following:
FIRST STORY: knocking occurs only with live steam and it happens because when the down-running condensate hits the up-going live steam, some of the condensate turns to steam and thus there is over-pressure in the pipe and thus knocking. This makes sense to me, but then I was told the second story:
SECOND STORY: knocking occurs in ANY radiator (live steam or not) when the condensate pools and then has to be knocked free by the steam pressure, so knocking can be fixed by tilting the radiator to avoid pooling (I have seen knocking decreased significantly by tilting a radiator, so I know there is truth to the last part of this)
Thanks for any help.