sizing steam pipe

George Berkeley

I forgot to ask, how large are the 3 radiators you installed new to this system? (Each on a 1" riser)

Mark_11

I recently had a 2nd story addition (2 bedrooms and a bath)put on my home. The 2nd floor doesn't get as warm as 1st. I have one pipe steam system. The plumber put 3 new radiators in, however I'm not so sure of his piping method. Out of a 1" tee in the main, he ran 1" copper then tee'd to 3-1" uninsulated risers to 2nd floor. Could this posibly have the volume needed for 3 radiators in a 420 sq. ft. addition?
Anyhelp would be appreciated. Thanks

[Deleted User]

A 1\" undripped

riser is rated for 45 sq. ft (10,800 btus).

If I understand you, there are 3 - 1" risers off of 1 - 1" connection to the main. If that 1st piece of 1" is horizontal, the numbers change to 28 sq. ft. (6,700 btus)available to feed 3 - 1" risers.

Mark_11

Thanks for responding Ron. Yes the first piece of 1" is horizontal for about one foot to first tee, then horizontal another 12 feet to second tee, then horizontal another 10 feet to last verticle riser. I don't know how much radiation I have or how much I need but 28 sq.ft doesn't sound like much.

Mark_11

waiting

for wetheads to return.

George Berkeley

Pipe size

The numbers read that with this system that 2nd floor will always be under heated. You are volume starved at the header. Let alone the impact at the boiler size.

Steamhead

Branch steam line

I'd go with a 2-inch black steel pipe to supply those 1-inch risers. Also provide a place to install a vent at the end of the new 2-inch pipe. Vent the pipe with a Gorton #1 or Hoffman #75.

Copper on steam lines is always a bad idea.

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Mark_11

i'm not sure

how radiators are measured, however 2 are brand new 'modern types' 1 is 4 section the other 12 sections, the 3rd radiator is a very old one about 7" deep, 27" high about 12 sections