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.
Young adults, particularly those 18 to 21 years old, sometimes run into difficulty with travel in the United States. Booking a hotel room may be particularly challenging, since many hotels set a minimum age requirement for guests.t is virtually impossible to rent a hotel room in the United States if you are under 18, the legal age of majority in all states. The two basic reasons for this are liability and contract enforcement.