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 younger than minimum check-in age must have parent or legal guardian present and staying in same room. The credit card being used as the method of payment must be presented at check-in at the property. Should the cardholder not be present at check-in, the hotel must have a photocopy of the credit card and an authorization form on file from the cardholder prior to check-in. For more details, please contact the office using the information on the reservation confirmation received after booking.