The importance of Rotterdam Port as oil & gas terminal cannot be overemphasized. All major oil & gas trading companies use the storage facilities at Rotterdam round the year. That also makes it an extremely difficult to access easily. Here is list of credible and reputed oil tanking companies :
https://amanattankstorage.com/
https://www.odfjell.com/terminals/rotterdam-netherlands/
https://www.lbctt.com/locations/lbc-rotterdam/
https://www.stolt-nielsen.com/en/#
https://www.rubis-terminal.com/
https://www.serviceterminal.com/
http://www.vestaterminals.com/