[Time-Limited Quick Response Contest, Round 2] 06 (Correct answer +15 Wealth Points) [Completed]
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Purpose: 1. To increase the popularity of this section. 2. Learn *professional knowledge in a relaxed atmosphere and exchange professional English. Rules: 1. Answer by replying, translating the English in parentheses into Chinese. 2. Editing the post twice after replying is strictly prohibited; any such attempt will result in the post being considered invalid. 3. The first person to answer correctly gets +15 wealth. 4. Scope of questions: Common standards and experience manuals for the process and piping specialties. Note: 1. Users who answer 5 questions correctly in total will receive a +50 wealth reward. Topic for this issue: 06. The rotor of one- and two-stage pumps shall be designed so that its first dry-bending critical speed is at least 20% above the pump’s maximum continuous operating speed. Correct answer: First dry-bending critical speed. Winner: Du Shuqiang. This post was last edited by niulijun117 on 2009-4-17 at 13:00
I’ll give it a try too: the critical velocity for the first dry bend
The (first-order rigid bending speed) of the rotors of stage 1 and stage 2 pumps must be at least 120% of the pump’s maximum operating speed.
first dry-bending critical speed Critical speed for first-order rigid bending
The first dry-bending critical speed refers to the critical rotational speed for rigid bending. The rotors of single-stage and two-stage pumps must be designed such that their first dry-bending critical speed is at least 20% higher than the pump’s maximum continuous operating speed. The design values for the motors of these pumps should ensure that their first dry-bending critical speed is at least 20% above the pump’s highest possible continuous operating speed.
The rotor of single-stage and two-stage pumps shall be designed so that its first dry-bending critical speed is at least 20% above the pump’s maximum continuous operating speed. The impeller of single-stage or two-stage pumps should be designed such that its first dry-bending critical speed is at least 20% higher than the pump’s maximum continuous operating speed
(Critical speed for first-order rigid bending)
Try: First critical speed (rigid)
The rotational speeds of the primary and secondary motors of the pump (the critical speed for first-order rigid bending) must be at least 20% higher than the maximum operating speed of the pump.
The motor rotors of the primary and secondary pumps are designed such that their (maximum speed) is at least 20% above the pump’s maximum operating speed.
The impellers of the primary and secondary pumps are designed such that their (maximum speed) should be at least 20% above the rated speed of that pump.
The maximum speed for a single-stage or two-stage pump design is 20% of the normal operating speed (the first critical speed)