Table for calculating volume of air per linear foot in various pipe sizes

SteamworkS

Anyone have a chart showing the amount of cubic feet of air per linear foot of pipe for various pipe sizes? I'm specifically looking for 1-1/4" and 1" IPS, but would love a chart for other sizes as well. Sizing my radiator vents using the master venting principles outlined in Gerry Gill's and Steve Pajek's article. Thanks.

SteamworkS

Sorry, I didn't look at the last page on Gerry and Steve's article. So I have all the values EXCEPT the amount of air per linear foot in a 1" pipe. Thanks

KC_Jones

1 1/4" and larger is already in Gerry and Steve's balancing steam (pg 14) which it sounds like you already have. For 1" pipe it would be .006 cu/ft per linear foot of pipe.

SteamworkS

Thanks KC.

JStar

If you don't have the charts handy, I've found a reliable rule-of-thumb to be 0.1 ft3 of air for every 10 feet of 1" or 1-1/4" radiator run-out. I usually remember it as 0.1 per floor.