We have a number of oil flooded screw machines in plant air service running at about 125 psig. In general, they all run very well and have been trouble free. They are package units that came in complete, so installation was relatively simple. There is a certain about of routine maintenance required for the filters, coolers and coalescers. However, it seems to me to be a small price to pay. The oldest of these machines has probably been running for about 15 years with no major repairs.
We do not have any oil lubricated sliding vane machines in air service. But the ones we have in other services are much more trouble. We tend to see wear on the vanes which requires a rather intensive PM program. We have to remove and measure the vanes for wear and replace them frequently. This has improved since we changed to Kevlar vanes. We tend to see wear in the bores of the cases (wash-boarding) that cannot be fully repaired. After some number of years, the vibration and vane wear caused by the worn cases requires us to completely replace the case. Our sliding vanes machines were not purchased as package units, so the installation was quite complex. We have a circulating glycol system for cooling, an oil injection system for lubrication of the compressors and bearings. We have gearboxes to achieve the needed speed which required another circulating oil system for the gearbox and motor.
The flooded screw machines are much quieter than the vane machines. The building that houses our largest pair of sliding vane compressors is one of only two areas in the plant that requires double hearing protection (plugs plus muffs). The noise level is too high for ear plugs alone.
Given my experience, I would much prefer the flooded screw option for air service rather than the sliding vane machine. I am not sure I know what you refer to as VRU, so I can&#;t comment on that service.
Johnny Pellin
Link to NAILI
History and Advantages of Vane Compressors
(Article copied from Linkedin)
The vane compressor is also called the rotary vane compressor or the sliding vane compressor.
The vane compressor was invented by Charles Barnes of Canada. He applied for a patent on June 16, .
The vane compressor is one of the most widely used products in the world today. They serve all walks of life.
The vane compressor uses centrifugal motion to generate compressed air.
The vane compressor, also known as the rotary vane air compressor, uses centrifugal motion to generate compressed air instead of using the reciprocating motion of a piston pump.
A compressor consists of a cylindrical rotor eccentrically placed in the casing.
This kind of casing has an air inlet and an air outlet also called an air inlet and an air outlet. The air inlet of the case is larger than the air outlet. There is a drum in the center of the rotor.
This drum rotates eccentrically with respect to the housing. This rotor has several radial slots. Each radial slot is equipped with a blade, which is spring-loaded. These blades are made of steel or synthetic fiber materials. If the compressor is oil-lubricated, there will be a thin layer of oil between the blades and the casing.
The space between adjacent blades forms a pocket with a decreasing volume from a fixed air inlet to a fixed air outlet.
The greater the number of vanes, the smaller the pressure difference between adjacent spaces around the rotor, the less air will leak.
The high-pressure ratio requires a large number of blades (20-30).
Advantages of vane compressor:
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1) It creates a very good suction vacuum.
2) The vane compressor is suitable for continuous air supply.
3) The vane compressor can achieve high-pressure and high-power compression.
4) The vane compressor has a longer life.
5) They are very suitable for medium pressure applications.
Some applications of vane compressors are:
1) Used in agricultural operations, agricultural equipment, material fabrication, transportation, etc.
2) It is used for the operation of the paint pump in the automobile body painting workshop.
3) Used for tire inflation in tires and wheel factories.
4) For dry cleaning.
5) Used for air knife operation, cutting, and peeling.
6) It is used in welding operations and air-operated metal and woodworking tools.
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