【Daily Question: Pump Equipment】Fill-in-the-blank question, 3/9/2019

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This post was last edited by 3983596_FPPZ on 2019-3-10 at 14:08. Rules for the bk14.jpg fill-in-the-blank questions: 1. If both answers are incorrect, +2 wealth for active participation; if one answer is correct and the other is incorrect, +5 wealth; if both answers are correct, +8 wealth. 2. If only one answer is provided, unless it is clear which question’s answer it is, a correct answer earns +5 wealth points, while an incorrect answer earns +2 wealth points; in all other cases, it is counted as active participation and awards +2 wealth points. 3. Rewards for answers are available once per person only. 4. Each reply allows scoring for only one person. 5. The answer and its explanation will be visible after responding. 6. The reward is valid for 48 hours; no reward will be given after that period. Studying* and winning awards again; come by here every day. 1. The inner diameter of the pipeline is 250 mm (10 inches), and the volumetric flow rate is 420 m3/h. What is the average flow velocity in the pipeline? ( ) m/s. 2. The diameter at the interface of the mechanical seal friction pairs is 80 mm, and the pump’s rotation speed is 2900 RPM. What is the linear velocity at that interface? ( ) m/s. Answers: (This type of calculation is encountered frequently; please look up relevant information to understand the method of calculation.) 1. 2.38 2. 12.15