Ethylene Plant Knowledge (Technology) Questions 12.15

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This post was last edited by lijianhuai on 2013-2-4 at 15:16. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the petrochemical technology exchange area! At the same time, I hope other moderators will also participate in this activity, taking turns to come up with questions and discuss various sets of devices! Let’s work together to promote the development of the petrochemical technology exchange zone! The maximum score for this activity is 20 Wealth points. Friendly votes and repeated voting are not allowed; please be careful when posting. Posts that are edited will not be counted as valid votes! Those who have different opinions on the suggested answers can post discussions the next day, and those who provide solutions or their own opinions regarding the daily question will receive appropriate rewards! The focus is on participation, and there are prizes for it! To prevent the answers of some members from affecting others, please hide your posts when answering questions. Thank you for your cooperation. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Thank you all for your participation! Learn more*, communicate more, gain more! 1. Instruments used to implement alarm and interlock protection systems generally do not use ( ). A. Programmable Logic Controller (PLC) B. Emergency Stop System (ESD) C. Logical control modules and digital I/O components in DCS D. Relay components 2. In the composition of interlock circuits, what belongs to the input part is ( ). A. Control panel switch B. Relay contacts C. Solenoid valve D. Electric actuator 3. To ensure the safe operation of the important equipment in the ethylene plant, (　　) measures are adopted. A. Interlock protection B. DCS control C. Optical and acoustic signal alarms D. Flammable gas alarm 4. Interlock circuits are installed in ethylene plants to ensure (　　). A. Personnel safety B. Equipment safety and stable operation C. Controllability of operations D. Safe operation of critical equipment. 5. When designing piping systems, the design pressure and temperature for pipes and fittings are determined based on the operating conditions under (　　). A. Incorrect operation B. Accident condition C. Startup and normal operation status D. Normal status 6. When designing piping systems, the choice of pipe material is determined based on (　　) conditions. A. Ambient temperature B. Properties of the medium C. Design pressure D. Design temperature 7. Regarding the principles for purging ethylene plants, which of the following statements is incorrect? (　　) A. During purging, the control valve in the system can be used as the valve for regulating the purging process. B. When purging the connections between the piping and the system equipment, any debris should be blown into the container, after which manual cleaning is required. C. For purging high-pressure steam pipelines, a testing procedure should be carried out to verify that the purging has been done properly. D. When the diameter of the process piping is greater than 500 mm, manual cleaning is necessary. 8. Regarding the principles of purging in ethylene plants, which of the following statements are correct? (　　) A. For the purging of pipes and systems, a flow diagram for the purging process of the system’s pipes should be prepared in advance. B. When purging the inlet of safety valves connected to pipes, those safety valves must be disconnected from the pipes, and blind flanges should be installed at those connections. C. A specific cleaning plan should be developed for towers, tanks, containers, etc. D. All instrument components installed on the pipes to be purged should be removed to prevent damage. 9. When using a gas-based purging method, the flow velocity of the purging gas should not be less than (　　)m/s. A.20 B.40 C.60 D.80 10. Regarding the use of the through-blowing method for purging process pipelines, which of the following statements is correct? A. Allow all pipes to discharge simultaneously B. Purge the main pipe first, then the branch pipes C. There is no order for purging D. Purge the branch pipes first, then the main pipe. Answers: (C), 2 (A), 3 (A), 4 (ABD), 5 (C), 6 (BCD), 7 (A), 8 (ABCD), 9 (A), 10 (B)