Question 55Safety & Environmental - Assistant Engineer

The correct answer is C) Hydrogen sulfide. When pumping sour crude oil, which contains hydrogen sulfide (H2S), it is crucial to test for the presence of this toxic gas before entering the cargo pump room to repair a leaking pump. Hydrogen sulfide is a highly flammable and poisonous gas that can be present in sour crude oil, and it must be detected and mitigated before any work is performed in the confined space of the cargo pump room. The other options (A, B, and D) are not the primary gases of concern when working with sour crude oil. Benzene, carbon monoxide, and tetraethyl lead are not the specific hazards that must be tested for in this scenario.