Towing vessel fire protection regulations require that all fuel tank vent pipes comply with all of the following provisions EXCEPT that the vent __________.

Correct Answer: Option A — must have a positive-acting shut-off valve to prevent water from entering the tank in heavy weather

Fuel tank vent pipes must connect to the highest point of the tank, discharge on a weather deck through a 180-degree U-bend, and be fitted with 30x30 mesh flame screens. Installing shut-off valves on vents is dangerous and strictly prohibited.