probably a steam trap releasing , wouldnt worry about it unless it persists,


"Ray" wrote:
Sorry to be such a pest, but I have another question about our aging steam
aradiator system in our six-unit apartment building. Last night, an hour or
9so after the weekly flushing of the systerm, we heard a very loud knock in
4the pipes. As if someone had hit the pipe with a sledgehammer.PIs this
dangerous? What should I do? Was the knock, which we heard only .once,
probably tied in with the flushing?