試題詳解

28. A non-inert cargo tank washing was carried out under both the source of ignition and flammability of the tank atmosphere are control. In what level of hydrocarbon vapor concentration you must stop the tank washing operation?
(A) More than 50% LFL (Lower Flammable Limit).
(B) More than 35% LFL (Lower Flammable Limit).
(C) More than 10% LFL (Lower Flammable Limit).
(D) More than 1% LFL (Lower Flammable Limit).