H bracket for an electric hoist
I am building an “H” shaped bracket to support an electric hoist. The bracket will be mounted between two “Z” beams that run lengthwise supporting the roof. I am making this out of black pipe and fittings. The sides of the H will each consist of a 24” piece of pipe connecting to a 36” piece of pipe with a Tee fitting. The two Tees will be joined with an 18” piece of pipe, making the “H”.
The four corners will each have a floor flange screwed on. The flanges will be bolted to the “Z” beams. In case it matters, the roof has a 4/12 pitch thus the bracket will be so tilted.
The maximum weight that will ever be supported by this bracket (including hoist and load) would be under 475 pounds. My question is what is the smallest black pipe I can use to make this work safely? The bracket for the hoist could be mounted on a pipe with an OD of up to 1 ½ inches but I was figuring on using ½ inch (or even ⅜ inch) pipe if that is strong enough.
I’m not an engineer or student and have been unable to find any info about the strength of black pipe. Also, I wonder, if I found it, would there be a weakening where the connections are?
Thanks for any help anyone can provide.