Irrespective of the size of the tankers, the main criteria adopted during design and construction are with regard to:
Prevention of Hazards from the cargo and cargo vapour.
Prevention of Pollution hazard.
Prevention of fire hazard.
Each of the above objectives are achieved only when a tanker is constructed as well as operated in accordance with well established rules and regulations.
Most of the rules regarding design and construction are as per SOLAS and MARPOL regulations and also classification societies have their rules which normally are in line with the IMO rules.