I live in the desert outside Palm Desert in a rural flat area (everything is sand). I am adding a generator and a propane tank behind my house (15' from back of house). I am doing my own concrete for both slabs that will hold the generator and the propane tank. I want to prepare and terminate the pipe connecting the slabs (like I show in the picture below).
I know from my generator doc that for a 20' run I need a 3/4' pipe so at least I have that. Can someone help me with anything else I need to so? That is, are their specific corner pipe specs I need? I live in earthquake country so am wondering if the pipe should be something besides copper, or is copper good enough because it bends a little. I was planning on mounting it right through the concrete so the connection is clean.
Any tips are appreciated. I do plan on having a plumber come later when I get the tank and generator (along with the electrician), but I want to have the pad and the pipe ready now.