Question 78Safety & Environmental - Assistant Engineer

The correct answer is B) When the terminal is equipped with a cathodic protection system. Insulating flanges are used in fueling hoses to electrically isolate sections of the hose, which helps prevent the flow of static electricity and stray currents. This is important when transferring flammable fuels, as static electricity buildup can create a fire or explosion hazard. When a terminal is equipped with a cathodic protection system, this system needs to be electrically isolated from the fueling system. An insulating flange accomplishes this isolation, allowing the cathodic protection to function properly without interfering with the fueling operation. The other answer choices are incorrect because: A) static electricity is always a concern when transferring flammable fuels, so an insulating flange is needed; C) LNG transfer would require insulating flanges, but this is not the specific reason given in the question; and D) a bonding cable alone does not eliminate the need for an insulating flange.