I need direction on a portable brine line

[dcasto]

We need to pump brine into several disposal wells over a long time period, say 4 years. We need to move the lines every 3 to 6 months. The brine is saturated but has never been in contact with air so O2 should be in ppm range. The pressure is 300 psig. I've look at fiber glass, polyethylene and steel. Each has a problem with pressure rating, UV, cost, welding, ect. I was wondering about aluminum or aluminum alloys. Would they work in brine? We'd like to have lenghts of pipe with quick fittings so we could move them easily without cranes and such. The sizes range from 3" to 8".

Any thoughts or help.

Thanks