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.
All passengers must be 21 years old to drink alcohol and 18 to gamble in the casino. All passengers must be 21 years old, or have at least one person in the cabin over age 21. During certain times of the year, like Spring Break, passengers ages 21 to 24 must have one person at least 25 years old in the same cabin.