Thanks for all of the replies. The rings are going to be part of a support for a store display system. I can't go into more detail at this time of what the display is for. The 10" rings have to be round as there will be another piece that will fit into them but the tolerances do not have to be perfect as I left my self some big wiggle room. I did price out having a bigger fab shop either roll the rings for me or bandsaw cut the schd 40 pipe for me either way it would cost about $120.00 and I would have to pass that cost on to the customer, making my bid much less competitive. I think I will use the suggestions that most of you made about forming the rings from flat stock. I am going to take the risk of making a jig for this job because if the store likes my work it might lead to them purchasing more of these displays for me.
I may be jumping the gun but last night I drew up full scale prints for this job on my shop floor for the layout. Now lets hope I get the job. As more money comes into my shop I will be looking at a bandsaw and a boss pedestal ring roller. My blacksmith & fabrication shop is part time for me at this time but I am right on the edge of being able to make it my full time job.
