【Daily Question: Pump Equipment】Fill-in-the-blank and True/False Questions, June 3, 2019
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bk14.jpg Rules for answering questions and management: 1. If all answers to a question are incorrect, participants will receive 2 wealth points as a reward; no rewards will be given for responses that are not answers； 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. Fill in the blank: On a given installation, when the pump flow rate increases, then the installation’s net positive suction head will ( ) ； 2. Judgment: Rigid couplings do not compensate for the positional errors between the two shafts nor do they provide vibration damping ( ). Answer: 1. Reduce ； 2. Correct
Question 1: Unchanged. Question 2: Correct
https://bbs.hcbbs.com/thread-627696-1-1.html This is a discussion on Haichuan; so, whether to increase or decrease it – does the original poster have an explanation with a clear answer?
This post was last edited by 3983596_FPPZ on 2019-6-3 08:24. What is mentioned here is the net positive suction head available for the device (also known as effective NPSHA; the higher this value, the better). The net positive suction head required by the pump is also referred to as necessary NPSH, and the lower this value, the better). This value decreases as the flow rate increases, and the intersection point of this curve with the pump’s performance curve represents the operating point of the pump. Please refer to relevant materials on this topic rather than looking for answers on forums; pay attention to the differences between concepts and names.