Prize-winning Quiz on Coal Chemical Engineering Knowledge 15

1. The nameplate of a certain valve reads Z417-25C. This valve is a (B) valve. A: A gate valve with a nominal pressure of 25 MPa; B: A gate valve with a nominal pressure of 2.5 MPa; C: A globe valve with a nominal pressure of 25 MPa; D: A check valve with a nominal pressure of 2.5 MPa. 2. The best way to determine whether a centrifugal pump is running in reverse is (C). A: Check the outlet pressure after starting it; B: Stop it after starting and observe; C: Start the motor intermittently and then observe. 3. Which of the following statements is incorrect? (B). A: 1 standard atmosphere = 760 mmHg; B: 1 standard atmosphere = 1 engineering atmosphere; C: 1 engineering atmosphere = 10 mH2O; D: 1 engineering atmosphere = 735.6 mmHg. 4. The pipe fitting used to change the direction of a pipeline is called an elbow, and the main types include (A). A: 90°, 60°, 45° elbows; B: 90°, 120°, 45°, 30° elbows; C: 90°, 180°, 30°, 45° elbows; 5. Eight things that are necessary when entering a container: First, it is necessary to apply for permission, obtain the required certificates, and get approval. 　　II. Safety isolation must be implemented. 　　III. The power supply must be disconnected, and safety lighting must be used. 　　IV. Replacement and ventilation must be carried out. 　　V. Safety analysis must be conducted within the specified time frame. 　　VI. Required protective equipment must be worn. 　　VII. Someone must be stationed outside the device for monitoring and to remain at their post. 　　VIII. There must be emergency rescue measures in place. This post was last edited by LZ Gas Station on 2009-4-15 20:26]

1.b, 2.b, 3.b, 4.a 5. Eight requirements for entering the container: 1. An application must be submitted and approved； 2. Safety isolation must be implemented ； 3. Replacement and ventilation must be carried out ； 4. Safety analysis must be conducted within the specified time frame ； 5. Required protective equipment must be worn ； 6. There must be someone monitoring outside the device ； 7. Supervisors must remain at their posts ； 8. Rescue equipment and measures must be available.

Eight essential requirements for entering a container using BCBB: 1. An application must be submitted, permits obtained, and approval granted. 2. Safety isolation must be implemented. 3. Purging and ventilation must take place. 4. A safety analysis must be conducted within the specified time frame. 5. Appropriate protective equipment must be worn. 6. There must be someone outside the container to monitor the situation. 7. The monitoring personnel must remain at their posts. 8. Emergency equipment and procedures must be available.

BCDA must apply, obtain the necessary permits, and get approval. Safety isolation is required; replacement and ventilation must be carried out. Safety analyses must be conducted according to specified time frames. Required protective equipment must be worn. There must be someone outside the device to supervise, and this supervisor must remain at their post. Emergency equipment and measures must also be available.

For my views on the daily question, please see: http://bbs.hcbbs.com/thread-444650-1-1.html. I hope the original poster will share their thoughts. Thank you!