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.
Passengers 55 and older by their departure date can qualify for special rates. You must confirm your age with a government-issued ID (we recommend a passport or driver's license) at the pier before boarding the ship. Most cruise lines qualify seniors as 55 and older. Exceptions to this are: Costa Cruises, Crystal Cruises, Disney Cruise Line, Holland America Line, Princess Cruises.