This house has like 1 1/4" gas pipe sleeved from next to the panel to the garage. The garage is fed by a 2 pole 30amp cutler-hammer breaker. I have never seen a piece of gas pipe floated 6 feet off the ground to feed a garage. I thought you would get a kick out of it.
I worked on a house like this and consulted the AHJ. Our feeling was that if it's under 10' between support it's code compliant, if it's over 10' it's not. I would have had to tear up some concrete to go underground. I suppose you'd have to also consider the height of the pipe.
Unless I'm mistaken (and I probably am), I believe that the implication is that the pipe is a standard "black iron" gas pipe used as a conduit to feed a detached garage/subpanel. Or maybe not, who knows?
(note the nice asbestos siding on the wall in the second pic. I wish they still made stuff that looks like that.)