i used to work for kirby. They got a good program, start out in a 2 week basic deckhand course, teach you safety and how to tie up the barges ect. then you work as a deckhand and after x amount of months you go to there basic tankerman class, learn how to load/dis, back to the boat to get 10 loads and dis w a tankerman, then back to class for their final prep. All classes are paid for and you also get your daily wage while in class.
other companies down there:
maryland marine
blessy
higgman
cenak
theres a bunch, search google
Shake if you get experience on boats first and then go shore tankerman you can always go back to boats. Gives you more options I worked for SGS after I had my tankerman endorsement.I decided to go back to work on the boats. Just about all companys that have chemical barges pay for schooling.