Will small changes in the temperature of the pumped medium affect pump vibration?
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Gas separation unit propylene tower reflux and product pump media: Propylene pumping temperature: 46.1 Density: 0.4738 viscosity at this temperature: 0.08 rated suction pressure: 1.85 lift: 140 normal traffic: 1837.4 Rated flow: 2300 1100 (minimum flow) From the DCS, the temperature change of the medium after air cooling is very small, basically within 1°. The vibration of the pump occasionally exceeds the standard of 3.5-4mm/s, and the time is only ten minutes, and it is normal again. What are the common causes of this phenomenon? Pump mechanical problems are basically eliminated. Could you please help me to answer this question?
This post was last edited by bfdlwolf on 2019-7-29 21:29 Is propylene vaporizing? Although the temperature change is small, the saturated vapor pressure of propylene is very large and it is easy to vaporize, causing cavitation in the pump.
Are there any changes in inlet pressure, outlet pressure, and flow rate?
Take a look at the traffic to see if there is any leakage. Or high gas content in the medium can also cause cavitation. If this happens frequently, the pump will be easily damaged.
I have never played with acrylic, so I don’t know what type of pump you are using. It looks like a centrifugal pump. Your traffic trend line should be generated by technology. It is recommended to enlarge this trend line to view other simultaneous changes in time. In addition, whether the pressure and temperature are within the range of NPSH?
In small cases, cavitation occurs once every once in a while.
This temperature is exactly the saturated vapor pressure. It is very likely to vaporize at 1C.
The inlet pressure, outlet pressure and flow rate basically remain unchanged.
The saturated vapor pressure of propylene at 49°C is 2.0144Mpa. How do you control the top pressure of your tower to be so low?
Small changes will not affect vibration unless the operating conditions are particularly critical and such changes cause cavitation problems.
What are the common causes of cavitation in the small cases you mentioned?