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.
I believe it is 18, some places 21. They will check your ID when you check in and you will also have to give them a credit card at the time of check in for incidentals (ie room service, pay per view etc.) loves2shop Â· 9 years ago. 0. Thumbs up.