For all loading operations, the terminal must supply the vessel with a means in which the vessel's designated person-in-charge may stop the flow of oil to the vessel, insuring immediate shutdown in the event of a hose rupture, tank overflow, etc. Which of the following choices will accomplish this task as required by 33 CFR?

Correct Answer: Option D — a pneumatically or mechanically operated device

33 CFR 154.550 mandates that a means of communication between the vessel and facility must be capable of stopping the flow of oil. A pneumatically or mechanically operated device provides a reliable, direct method for the Person-in-Charge to trigger an emergency shutdown of the transfer pump.