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Some questions about replacing part of a steam main
This is a 4 story apartment building. 1 basement level and then 3 floors above that. The boiler is in the basement. The steam main goes into a pit and the pit is about 6 feet deep where there is a condensate tank. There are tunnels (about 3 or 4 feet high below the basement level) that follow the steam main.
I need to replace the steam main from the green dot back to the condensate tank. This is about 60 feet. At the green dot the main reduces from 4 inches to 3 inches (so replace everything starting after that reducer). 12 feet past that there is a 1-1/2 riser as shown in the picture. I think it feeds 8 small radiators of about 9 EDR each or 72 EDR total. There is another 1-1/2 riser near the end, but the radiators on that riser have been taken out. The main reduces after each riser but doesn't go below 1-1/4 until in the pit just before the condensate tank where it reduces to 1", goes through a strainer, reduces to 3/4 and goes through the F&T trap and then into the condensate tank. There is also the condensate return line that comes into the condensate tank. I think it's 1-1/2 inches
My plan was to immediately reduce to 2 inches until I get to the 1-1/2 riser. Then reduce to 1-1/2 until I'm about 10' from the condensate tank, and then 1-1/4.
The F&T trap is in the pit just before the condensate tank. There doesn't seem to be any vents.
Can I do this?
Also, in the picture there is a 1-1/2 riser, a 3/4 line that feeds a radiator, but I don't know what that other pipe is with a 90 and a plug? This is a two pipe system, the condensate return line isn't shown in the picture, but it's there.
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