Tankers are ships used for liquid cargo transport inside of specialized storage spaces called tanks. A design and production of tankers is a long-lasting process made up of many obstacles. Insight into the construction of the tanker shows huge system complexity which enable tanker’s safe running. Therefore, ship’s constructions are separated on variety of smaller sub-systems, in order to explain different tanker’s characteristics more easily. Nowadays, they are present throughout all the parts of the world, their usage acquires variety of forms, hence it is necessary to maximize the efficiency of these systems throughout the production. Plenty of external factors, negatively affect the ship’s voyage. International rules and criteria have been set to follow up on when developing tankers, in order to prevent accidents and undesirable consequences. In the thesis, different sub-systems, parts, of which the complex tanker’s system is consisted off, are being cited, as well as the most important information about those sub-systems. Thesis ends with an example of tanker Seawise Giant, internationally recognized as the largest tanker ever produced.