Multiple-choice questions (9 points for correct answers, 3 points for participation)
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In the statement about purge replacement, which one is incorrect? ( ) (A) When purging a pressure vessel after it is taken out of service, different purging media should be selected based on its production process and conditions. (B) Subsequent procedures cannot be carried out until the purging process for the pressure vessel after it is taken out of service is completed. (C) In winter, it may not be necessary to deal with certain exposed equipment and pipeline areas where water cannot be completely drained. (D) During winter shutdowns, water vapor lines must be purged using compressed air to remove any accumulated water. C
C) In winter, certain outdoor equipment and pipe corners from which water cannot be completely drained may not be treated
(C) In winter, certain outdoor equipment and pipeline dead zones from which water cannot be completely drained may not require treatment