FAQ: Frequently Asked Questions about Aerzen India, products and services

What type of oil should my Aerzen blower or compressor use? (30k - pdf format)
What is the diffrerence between a blower and a compressor?
What are the typical operating pressure and vacuum limits of positive displacement blowers / vacuum pumps and oil-free screw compressors?
How do oil-free screw compressors differ from typical (oil-injected) compressors?
What is the functional difference between a two lobe and three lobe Aerzen blower?
What is the typical flow configuration of Aerzen blowers?
What components are found on a typical functional blower package?
Can a pressure blower package be converted into a vacuum pump package at a later date?

What is the difference between a blower and a compressor?: Blowers displace the medium (air or gas) and operate against back-pressure created in a given process. Compressors, however, feature built-in compression, which becomes more efficient around pressures of 1 bar (15 psig). Pressure vessel certification is a legal requirement in most jurisdictions around the world. Read more about the differences

What are the typical operating pressure and vacuum limits of positive displacement blowers / vacuum pumps and oil-free screw compressors?: Standard blowers operate up to pressures of 1 bar (15 psig) gauge and -500 mbar vacuum (15"Hg), oil-free single stage compressors up to 3.5 bar (50 psig) gauge. Compressors can go down to a vacuum of -850 mbar (25"Hg). Aerzen produces specialized high vacuum and pressure booster machines for non-standard applications

How do oil-free screw compressors differ from typical (oil-injected) compressors?: Oil-free screw compressors are limited in the pressure which can be achieved in a single stage due to temperature, as there is no oil to cool the screws. Therefore, compression is limited to 3.5 bar vs. the typical plant air pressure of approx. 10 bar. To reach higher pressures, oil-free compressors can be multi-staged using intercoolers.

What is the functional difference between a two lobe and three lobe Aerzen blower?: Aerzen three lobe blowers incorporate pulsation cancellation technology (reducing piping sound and vibrations) and offer a wider flow range than conventional two lobe machines. Note: the mere use of three lobe rotors (w/out pulsation control technology) offered by many manufacturers does not effectively reduce pulsations.

What is the typical flow configuration of Aerzen blowers?: We favor vertical flow across the blower (top to bottom) as it optimizes lubrication, limits vibration and avoids internal contamination. In the completed turnkey package, the discharge connection to plant piping ends up being horizontal. Specialized blowers can be set up for either vertical or horizontal flow configuration.

What components are found on a typical functional blower package?: For an answer, view Blower Package Components.

Can a pressure blower package be converted into a vacuum pump package at a later date?: Yes, most components can be re-used, limiting the modification to certain devices only.