They can be distinguished by the number of derricks for working cargo, by the superstructure, which is larger than that of the normal cargo vessel, and by the number of lifeboats.
Ziyokohlulwa nangenani lezilenge lokusebenzela imithwalo ethuthwayo kwisakhiwo esikhulu esona sikhulu kunezikhephe eziqhelekileyo zokuthutha imithwalo, nangena kwizikhephe zokuhlangula.