Leandro,
I am sorry not to respond sooner - most are custom built to fit the layout - Plastruct makes the parts - you can decide on the level of detail - they look good with a minimum of valves, piping, tanks and such -
I think OGR forum member Alan Graziano has built a few for some customers - try a search on the forum
A tank farm and a distribution platform may provide the look that you want without the expense of a refinery
I will look for some ideas for you -