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.
Some hotels (including hotels located in New York, Cancun, Puerto Adventuras, Mount Washington and others) make exceptions to this age. For these hotels a âchildâ is any person who is 12 years of age or younger.