How “Vaneslip” Affects Pump Performance
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Vooner Liquid Ring Conical Port Vacuum Pumps
How “Vaneslip” Affects Liquid Ring Vacuum Pump Performance
The liquid inside the pump helps to create a seal. The impeller uses centrifugal force to create a ring of liquid around the edges of the offset vanes. This sealant liquid is highly effective but can create some corrosion issues. The most common liquid is water (sometimes called water ring vacuum pumps), but these can be created to work with any liquid type.
The portion of the discharge gas that is not discharged out of the pump but leaks past the seal clearance between the vane of the rotor and the seal segment of the cone is called “Vaneslip.” Vaneslip allows high-pressure gas to enter the inlet section and, therefore, robs space for new inlet air to enter the pump, thereby reducing the flow of vacuum gas being removed from the process.
With cast iron pumps in operation, the iron oxide (rust) that forms on the rotor and cone surfaces is physically worn away with use, increasing the clearance between the rotary vanes and the seal segment of the cone.
This decreases the seal, which then allows the high-pressure gas of the discharge segment to enter the vacuum inlet section of the pump.
Vooner FloGard stainless pumps have blades that rotate without losing pressure from corrosion, offering greater efficiency.
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Vooner FloGard has over 30 years of experience with corrosion and erosion-resistant vacuum pump applications, including patented vacuum pump designs and vacuum system engineering capabilities. In addition, Vooner is an original equipment manufacturer for complete vacuum systems for slurry dewatering, evaporation, pneumatic conveying, condenser exhauster, and felt cleaning in paper mills.
