Question 1275 Deck General

The correct answer is B) automatically operated hinged closure. The U.S. Coast Guard regulations specify that an automatically operated hinged closure is an acceptable means of closure for ballast and fuel oil tank vents. This type of closure automatically opens and closes the vent based on the pressure inside the tank, preventing the unintentional release of vapors or the entry of water. The other options are not acceptable per the regulations. A manually operated ball check valve would require manual intervention, while a permanently installed canvas hood or corrosion-resistant wire screen may not provide the same level of automatic and reliable closure as the hinged closure.