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Pipe banging while the last radiator gets hot. Vent or Slope issue?
My friends mother has a Columbia Steam boiler in the basement of her 3 floor townhouse and her bedroom radiator on the 2nd floor is the last radiator in the house that gets hot. All the 3rd floor radiator get hot quickly but the boiler has to be on for at least 20 minutes before the bedroom radiator gets hot. The pipe that goes to the bedroom radiator is visible on the first floor(see pics) and you can feel it slowly get hot from the bottom to the top as it bangs loudly and slowly gets into the bedroom radiator.
I've only been able to see one vent on the entire system and all the radiator vents seem to close when they get hot. Most of the vents are #11's.
The pipe that goes to the problem radiator travels from the boiler to the ceiling to the back of the basement. The pipe is up in the ceiling behind the drywall. I'm not sure if this pipe needs a vent somewhere and it's possible that the pipe isn't sloped properly but I can tell unless I cut open the ceiling drywall.
I put my hand on the banging vertical pipe and it goes up on the 1st floor and it felt like there was a metal snake rattling inside the pipe, very strange and I don't know if this is normal.
I drained the boiler and a lot of sediment came out. The LWCO seems to work because it called the auto water feed and filled the boiler to half way up the site glass.
The gauge on the boiler also seems to stay at zero.
I've attached some pictures and I labelled the banging pipe and vent.
Any idea what my first step should be to fix this problem?