Question 1183 Deck General

The correct answer is D) 100 millimeters of water pressure. According to Coast Guard regulations, during loading, discharging, and when the cargo tanks have been properly filled, each inert gas system must be capable of maintaining a minimum gas pressure of 100 millimeters of water pressure. This requirement ensures there is sufficient positive pressure in the cargo tanks to prevent the ingress of air and maintain an inert atmosphere, which is essential for safety during cargo operations. The other answer choices are incorrect as they do not align with the specific regulatory requirement of 100 millimeters of water pressure for inert gas systems on vessels.