2017-6-25 Purification Technology Edition: Daily Question

Thread Content

1. When a container that has stored or contained harmful gases or liquids is opened, it should ( ). (A) Enter immediately to start working. (B) Enter the equipment wearing a filtered gas mask. (C) Analyze the gases inside the tank; entry is permitted only if they are within acceptable limits. (D) Wait for half an hour for gas replacement before entering. 2. Which of the following is the incorrect procedure during shutdown for maintenance? ( ) (A) When maintenance personnel enter equipment that has been purged with N2, they must first blow it out with compressed air; entry is allowed only after the gas sample is found to be satisfactory. (B) During winter shutdowns, water vapor lines must be blown out with compressed air to remove any accumulated water. (C) In winter, for those outdoor equipment pipelines in hard-to-reach areas where water cannot be removed, the equipment must be disassembled to drain all the water. (D) During winter shutdowns, the water drainage valves on the water lines should be opened for drainage, while those on the steam lines do not need to be opened for drainage. CD Note: Answers must be submitted within three days! ! !