【Daily Question: Pump Equipment】Short Answer Question, 2019.2.12
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This post was last edited by 3983596_FPPZ on 2019-2-12 at 19:07. Rules for short-answer questions: 1. If the answer is incorrect, +2 wealth will be given for active participation; if the answer is somewhat reasonable but not specific enough, +5 wealth will be given; if the answer is correct, +8 wealth will be given. 2. Rewards for answers are available once per person only. 3. Each reply allows scoring for only one person. 4. The answer and its explanation will be visible after responding. 5. 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. Why can’t high-speed pumps be started with the outlet valve closed? Answer: When a high-speed pump is operating at high speed, the rotor spins very fast. When the outlet valve is closed, the liquid cannot flow out, and the medium being transported circulates back and forth inside the pump. This causes the temperature to rise rapidly, and under such conditions the medium is prone to vaporization, leading to cavitation or a reduction in flow rate, which can result in damage to the pump!
In high-speed pumps, due to the very high rotation speed of the impeller, when the valve is closed to start the pump, the liquid cannot flow out and the temperature rises rapidly; under such conditions, the fluid is highly prone to vaporization, which can lead to damage to the pump
When operating at high speeds and the outlet valve is closed, the medium being transported stirs back and forth inside, causing the temperature to rise rapidly. Under such conditions, the medium is very prone to vaporization, leading to cavitation or a reduction in flow rate
When the high-speed pump is started, the pressure rises too rapidly in an instant
In high-speed pumps, due to the very high rotation speed of the impeller, when the valve is closed to start the pump, the liquid cannot flow out and the temperature rises rapidly; under such conditions, the fluid is highly prone to vaporization, which can lead to damage to the pump
In high-speed pumps, due to the very high rotation speed of the impeller, when the valve is closed to start the pump, the liquid cannot flow out and the temperature rises rapidly; under such conditions, the fluid is highly prone to vaporization, which can lead to damage to the pump.
This post was last edited by Frozen Desert on 2019-2-12 at 11:16, as high-speed centrifugal pumps cannot operate at their minimum stable flow rate. At this time, unstable operating conditions can cause severe vibration in the high-speed shaft, and in serious cases, it may damage the mechanical seal. If water cannot flow out, high temperatures are likely to occur
In high-speed pumps, due to the very high speed of the impeller, when the valve is closed to start the pump, the liquid cannot flow out, and the temperature rises rapidly. Under such conditions, the fluid is highly prone to vaporization, which can lead to damage to the pump!
In high-speed pumps, due to the very high speed of the impeller, when the valve is closed to start the pump, the liquid cannot flow out, and the temperature rises rapidly. Under such conditions, the fluid is highly prone to vaporization, which can lead to damage to the pump! An excessively high oil level in the gearbox affects heat dissipation.
As the impeller rotates at high speed, the medium is stirred back and forth inside, causing the temperature to rise rapidly; under such conditions, the medium is very prone to vaporization, leading to cavitation or a reduction in flow rate
High-speed pumps, due to their very high impeller speeds, experience pressure buildup when starting with the valve closed! Prone to accidents