Here is a good app for your phone or tablet of the laws of all 50 states. Constantly updated.
CCW – Concealed Carry 50 State Guide by Workman Consulting
https://appsto.re/us/lViBA.i
Wheatland makes 20' EMT 20 Foot EMT & Rigid Electrical Conduit - Wheatland Tube and I believe others do as well.
To get a large radius circle you will have to do concentric bends. Multiple small degree bends spaced evenly.
Here is a site that should help. Segment Bends
Search concentric bends...