I like #33 but it looks too much like we're a pipe supply house. Can you show insulation coming off the pipe. It will also tie the old logo to the new one nicely. I'd also like to see the 'E' like the others.
My wife thinks it looks like a peeling banana. Can we try different colors? I'm not in love with yellow/orange. Asbestos insulation is usually white/cream in color. Maybe a background so the insulation can be white and the pipe gray with the letters being something other than yellow/orange.