【Q&A Question 316】November 30, 2017
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【Q&A Question 316】November 30, 2017: How to determine if a pump is under vacuum? After the pump becomes evacuated, issues such as large fluctuations in outlet pressure, significant pump vibration, noises inside the pump, abnormal sounds in the pipelines, and voltage fluctuations occur. These symptoms can be used to determine whether the pump has experienced evacuation. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 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 (Source: Haichuan Chemical Industry Forum)
Fluctuations in outlet pressure, abnormal noises, low current
Unstable flow rate, abnormal sound, pump vibration, etc
When the pump is evacuated, the pressure is very low, the flow rate becomes zero, the current decreases, and the pump vibrates significantly
The outlet pressure fluctuates significantly, the pump body vibrates greatly, and the flow rate varies considerably
1. Pressure and flow fluctuations, abnormal noises； 2. Current fluctuations ； 3. Over time, the temperature of the pump body will increase.
1. Pressure and flow fluctuations, abnormal noises； 2. Current fluctuations ； 3. Over time, the temperature of the pump body will increase. Methods for determining pump evacuation: Evacuation may occur under the following conditions – significant fluctuations in the instrument’s flow indication or a flow indication of zero ； The pressure current indication shows large fluctuations or no indication at all ； The pump outlet pressure drops or reads zero ； The pump vibrates significantly and produces noise ； There are abnormal noises inside the pipeline.
The pump body vibrates heavily； The outlet pressure gauge experiences large fluctuations ； Large fluctuations in export volume
The instrument flow indication fluctuates significantly or shows zero； The pressure current indication shows large fluctuations or no indication at all ； The pump outlet pressure drops or reads zero ； The pump vibrates significantly and produces noise ； There are abnormal noises inside the pipeline.
1. The flow rate at the pump outlet fluctuates greatly, and may even show zero. 2. The pump vibrates more intensely during operation, generating noise. 3. The motor current experiences fluctuations and decreases
(1) The outlet pressure fluctuates significantly. (2) The pump vibration is high. (3) The pump makes noise. (4) There are unusual noises inside the pipeline. (5) Leakage is caused by axial movement due to insufficient pressure. (6) Low liquid level in the tower and tank containers. (7) The instrument readings fluctuate. (8) Pressure, current fluctuations, or no indication.