Storage and Transportation Operations (11.11)
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When there are two or more water cut valves connected in series for an oil tank, when closing the valves at the end of the water cutting process, it is necessary to ( ). A. Close all the valves simultaneously; B. Close the last valve first; C. Close them one by one starting from the base of the tank; D. It is sufficient to close any one of them.
Choose C: close them in sequence, starting from the root valve.
C. Close them in sequence starting from the tank base;
C. Close them in sequence starting from the tank base;
C. Close them in sequence starting from the tank base;