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.
Guests under the age of 21 are not permitted onboard unless: 1  Traveling in the same stateroom with an individual 21 years or older. 2  Traveling with family groups booking multiple staterooms, the minimum age for each stateroom is 16 years of age, provided they are traveling with a parent or legal guardian.