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Sizing black pipe for radiator runs? Recommendation?

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Jack M
Jack M Member Posts: 239
edited March 2016 in Strictly Steam
When adding a radiator run (one pipe) off an existing main is there a recommended pipe diameter? Some of the longer existing radiator runs are 1-1/4" but most are 1-1/2". The "newer" pipes are all 1-1/4" (1.37 OD) while the older ones (1920's) are all 1-1/2" (1.9" OD).
How do you decide which size pipe to use when adding a new radiator run? Does it matter? Is the pipe diameter based on the radiator's EDR?

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