Process Design: 【Question of the Day】April 25, 2011 (Monday)

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This post was last edited by jintchinssen on 2011-4-25 08:35. Multiple-choice question: For vane pumps, backflow of the liquid can lead to the following _____ situations; in such cases, a check valve should be installed on the pump’s outlet pipe: A. The liquid temperature rises by more than 90°C above the normal operating temperature. B. The combined temperature and pressure of the output fluid exceed the design parameters of the pump casing. C. The impeller will be damaged due to reversal. D. Various variations that are not tolerable in the manufacturing process. Note: (1) We hope that all friends who are interested will participate: handshake. The first 50 people to answer the questions will receive a reward. Thank you all for your support ； (2) Please reply with the answer hidden; otherwise it will be invalid. Hidden method: http://bbs.hcbbs.com/thread-492556-1-1.html 9 }( V' P7 I1 L! M# T (3) Please do not edit after replying: L. This question will be closed when the new Daily Question is released. The answer is: ABCD. This question is from HG/T 20570-95.18—2.0.9.3 Check valves