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Return line in two pipe steam system
I've been trying to get rid of the water hammer noise in our 2 pipe steam system. I fixed a previous major remodel in the large kitchen where the radiators were moved and reconnected by a plumber with only hot water experience, so none of the pipes had proper slope. Now there is a residual occasional hammer on the other part of the house connected with a long sloped steam pipe. However the return line has no slope at all, and I'm wondering if it is needed for a return line. Also, about 50 feet from the boiler there is a strange pipe assembly connecting the steam and return lines (see picture). Could this be causing any water noise?
Thanks for any help for our c 1900 home.