Quote:
Originally Posted by 908/930
Do you have a magnet handy? Steel will be obvious.
1 1/2 pipe is 1.9 Dia, if it is tube it is probably 2"Dia. Aluminum usually has what it is printed on the side.
I would bring the threaded rod as close to the beam as it can get, should work either way.
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This. It sure looks like aluminum, but could also be stainless steel - but doesn't look like black pipe (painted) or galvanized. I assume you want to replace the current mast with the dipoles on it with the 6-8' longer pipe (not adding new pipe to existing). 1.9" OD is 1-1/2" IPS pipe size as stated above. Heavier wall thickness (Sch 10 to Sch 40 to Sch 80) will obviously give you more strength. I did have the bending formulas for pipe in a spreadsheet (replacing a steel roll cage with aluminum or titanium!) but cant find it right now - will keep looking! Galvanized pipe is more easily obtained, but aluminum shouldn't be an issue for what looks like a industrial/commercial installation. Specs might even be visible on the existing piece.