[Q&A Question 230] 2017.08.18
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【Q&A Question 230】August 18, 2017: What are the main factors that affect the performance curve of centrifugal pumps? The reference answers can be seen after responding; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The influence of the physical properties of liquids on the characteristic curves, including the effects of viscosity and density; in addition, the rotation speed of the centrifugal pump and the symmetry of the impeller diameter also have an impact. Scoring criteria: 2 points for incorrect answers, 3–8 points for *incomplete* answers, 10 points for correct answers with detailed explanations, and 15–20 points for correct answers with additional *complementary* information. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Saving” Campaign (Phase 2 is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
The characteristic curves of the heart pump refer to He～qV, η～qV, Pa～qV. The main factors affecting these curves are liquid density, viscosity, rotational speed, impeller shape, and diameter.
The main factors include liquid density, viscosity, rotational speed, impeller shape, and diameter. 1. Method of changing the pump’s characteristic curve: a. Change the pump’s speed. b. Cut the outer circumference of the impeller ； Change the impeller diameter. 2. Change the pipeline characteristic curve ； The most common method is to adjust the opening degree of the centrifugal pump outlet valve. When the valve is closed, the local resistance in the pipeline increases, the characteristic curve of the pipeline becomes steeper, the operating point shifts to the left, and the flow rate decreases.
The main factors include liquid density, viscosity, rotational speed, impeller shape, and diameter.
The characteristic curves of centrifugal pumps refer to He～qV, η～qV, Pa～qV. The main factors affecting these curves are liquid density, viscosity, rotational speed, impeller shape, and diameter.
Physical properties of liquids, centrifugal pump speed, etc
The main factors affecting these curves are liquid density, viscosity, rotational speed, impeller shape, and diameter.
The influence of the physical properties of liquids on the characteristic curves includes the effects of viscosity and density; in addition, the speed of the centrifugal pump and the symmetry of the impeller diameter also have an impact.
The main factors include liquid density, viscosity, rotational speed, impeller shape, and diameter
(1) Viscosity of the liquid to be transported: As viscosity increases, energy loss increases, while head, flow rate, and efficiency decrease; shaft power increases as well. (2) Density of the liquid to be transported. 3. Rotational speed of the centrifugal pump and size of the impeller