【Daily Question: Pump Equipment】Fill-in-the-blank question, June 12, 2019

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This post was last edited by 3983596_FPPZ on 2019-6-12 at 15:31. Rules for answering questions and managing the post: 1. If all answers to a question are incorrect, participants who engage actively will receive 2 Wealth points; replies that are not answers will not be rewarded； 2. In the answer section, a correct answer earns 5 wealth points ； A reward of 8 wealth for all correct answers ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. The vertical distance from the center line of the pump inlet to the water tank is 5 meters. The loss in the suction pipe is 0.2 meters, and the combined loss due to the inlet valve and elbow is 0.3 meters. Under standard atmospheric pressure and normal temperature conditions, for the pump to be able to operate properly, its NPSHR must not be greater than ( ) meters. 2. The impeller diameter of the centrifugal pump is 310 mm, and its rotational speed is 2950 RPM; therefore, the linear velocity at the outer diameter of the impeller is ( ) m/s. Answer: 1, 10.3-0.2-0.3-5-0.5=4.3 ； 2、2950*0.31*3.14159/60=47.88