I inherited a situation where steam was brought to the third floor by a pipe connecting off the steam-feed to a second floor radiator.
When steam begins in the system, there is a period of loud banging in this pipe to the third floor.
The radiators are properly pitched for condensate to drain back in the one-pipe system. There is no such banging in other pipes, only in this pipe that was used to add a steam radiator to the third floor.
Any solutions? Is this a problem due to wrong size pipe-diameter to the third floor? How can problem be corrected? Thanks.