I have a 230' foot long steam main with only one 1" H style F&T trap at the end. There is 85' of 6" main, 65' of 4", 60' of 3" and 20' of 2". How do I figure the condensate load to size that trap? The pipes are insulated w/1" of Fiberglas. Could someone steer me to a site with a chart for that sort of thing?
I'll be looking in the mean time, but you guys probably already know where to find it.
But I'm pretty sure this is in The Lost Art of Steam Heating. You have to look at the weight of the pipe and the difference in temperature between ambient and steam temperature. Once the pipe is hot there's very little condensate.
Gosh, thanks Dan for your reply! I have "The Lost Art..." and refer to it a lot. It is so packed with information that I have trouble digesting it all. Read, re-read, re-re-read. Then again later. "Two-Pipe Steam" is where I'm going to dwell for now. That's what I have: two-pipe, pumped condensate dry returns (at all seven systems, I think).
Specifically for today's problem, a Hoffman 3/4" inline F&T with a #75 vent on the outlet side will be more than enough to drain that main line.