A、immediately above the level of the oil
B、at the top of the tank
C、in the vent riser
D、one meter from the deck
更多“Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.”相关的问题
A、A.The tank is safe to enter B、B.The tank is especially dangerous to enter C、C.Carbon monoxide is present D、D.Water vapor present when the tank was sealed has oxidized
A、Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned B、The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank C、The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue D、Steam cleaning and water washing are both capable of generating electrostatic charges within a tank
A、Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned B、The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank C、The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue D、Steam cleaning and water washing are both capable of generating electrostatic charges within a tank
A、from side to side in the tanks of the vessel B、from fore to aft in the tanks of a vessel C、in and out of a vessel that is holed in a wing tank D、in and out of a vessel that is holed in a peak tank
A、secure all sources of fresh air to the tank B、begin transferring the fuel to other tanks C、top off the tank to force out all vapors D、station someone at the fixed CO2 release controls
A、press up a slack double bottom tank on the port side B、fill an empty centerline double bottom tank C、pump out a slack marine portable tank located on the portside amidships D、jettison the anchors and anchor cables
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