The image below is a schematic flow diagram of a typical oil refinery that depicts the various unit processes and the flow of intermediate product streams that occurs between the inlet crude oil feedstock and the final end products.
In order to check-in into a hotel, the person must be 21 years old.  If the person is younger than 21, then a parent or guardian can  give permission for them to check-in. 1 person found this useful.
If you are under 25, rental rules and surcharges listed below will apply, and you will be required to use a valid, acceptable credit card (debit cards are not permitted) for your rental in that city. Cities not listed require renters to be a minimum of 25 years of age. For non-U.S. cities, please review the rental terms and conditions available on Step 4 of the online reservation process or call us at 800-472-3325.