Fits inside a roboport logistic area so you can tile these and your factory will build them without needing to have supplies on you.
The Refinery will start cracking Light/Heavy oil when their quantities exceed 10k and you have more of them stored than the cracked liquid.
You will start making solid fuel out of light oil when it hits 23500 units, and out of gas when it hits 24k (making solid fuel out of light oil is the most efficient) - there are no plants dedicated to making solid fuel off heavy oil because it is better to crack it into light oil then process that into solid fuel.
Result is that you will always have at least 10k of any byproduct for anything you want, above that the refinery will try to keep products leveled and when a byproduct gets close to full it gets transformed into solid fuel (or cracked and then transformed into solid fuel in the case of heavy oil). Refinery will keep working until its tanks and 6 provider chests are full.
Perfect ratio is 25:3:21 (refineries:heavy to light:light to gas) - this uses a good enough approximation of 8:1:7 (you can crack byproducts slightly faster than produce). Both solid fuel plants can also work a little bit faster than what you can produce of raw materials.
Also includes 5 tanks of storage for each byproduct, 4 for crude oil and 2 for checking water pressure (if they are empty you need to provide it with more water)
Refineries placed next to eachother will supply themselves with electricity and necessary products as well as link their byproducts to the same pipe network (you supply 1 you supply them all). Roboport has 1 extra tile of logistic area on top and sides so you can create walkways between your refineries.