Solving the oil emulsification problem in rotary vane vacuum pumps used in vacuum systems
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Roots vacuum pumps: What are the reasons for oil emulsification? Feel free to discuss and share your insights
Oil emulsification is caused, firstly, by poor sealing that leads to the mixing of oil and air; secondly, it is caused by high temperatures in the pump body
This post was last edited by CHANGBAISHI on 2018-9-11 09:26. There’s no need for analysis here – it’s simply a case of a leak in the cooler (an internal leak). Stop the system, remove the end caps of the oil cooler, inflate the oil side (the shell side), and use soapy water to detect leaks in the tubes at both ends. For the tubes with leaks, secure their ends with bolts and weld them shut. It is recommended to take images of the equipment from three or four different angles next time, so as to show its full appearance and facilitate discussion. Oh, drain all the oil inside the machine; it’s best to disassemble it and remove all the moisture (that’s ideal).
I want to get involved in the buying and selling of vacuum units; the quality of the oil is poor, and it tends to emulsify at high temperatures； If water enters the fuel tank, emulsification occurs; a failure to increase the oil level indicates the presence of water vapor. Water returns from the water ring vacuum pump, and if the oil and water levels are always full, it means there is a leak in the cooling water
The main reason for oil emulsification in our equipment is the water ring pump; after it stops operating, it is not possible to eliminate the vacuum in the system. There is no solenoid valve at the inlet of the water ring pump – a valve that would open when the pump stops running and close when it starts running – and as a result, water from the water ring pump flows back into the chamber of the Roots vacuum pump. Do you think this is likely?
The problem stems from the design of the Roots pump; every type of pump is designed taking into account specific process conditions. The Roots pump you are using is not suitable for your process requirements. It may be inexpensive at the time of purchase, but it actually increases the operating costs significantly! In this situation, even if you frequently change the lubricant, it is still impossible to prevent rapid damage to the bearings and gears! Cirrots pumps can ensure that such issues do not occur within 2 years under these operating conditions – a 2-year warranty on the entire unit! Feel free to contact me!
Main reasons: 1. Poor quality of lubricating oil, with high water content. 2. The rotary vane pump with the email and bearing integrated is a bit outdated. 3. There is a high amount of water vapor in the gas being drawn.
wx_Changcun977977 posted on 2018-9-12 06:56. The main reason for oil emulsification in our equipment is the water ring pump; after the pump stops operating, it’s not possible to eliminate the vacuum, and there is no solenoid valve at the inlet of the water ring pump. The situation you described does occur as well, but if water flows back into the Roots pump, then the water and oil in the pump chamber should mix together, and this should be visible through the viewing window. However, the oil level in the window doesn’t increase much, which is likely due to temperature factors. Another possibility is that the piston rings of the Roots pump are not sealing properly.
Your situation has little to do with the water drawn back in when the water ring pump stops, as there is very little water in the window, and the piping can absorb it. The most likely cause is a quality issue with the rotary pump produced by that manufacturer, which fails to seal out the moisture inside the system. It is recommended to switch to another manufacturer; don’t go for the cheapest option, as it can be very troublesome to use.