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10 Most Frequently Asked Questions: Questions
   Q. Why Turblex? It costs more than a multi-stage or PD blower.
   Q. Why single-stage rather than multi-stage?
   Q. How do I decide which type unit to purchase: single-stage, multi-stage, or positive displacement blower?
   Q. What are, and why do you use dual vanes?
   Q. Why does Turblex promote aeration systems (or process) control?
   Q. What is surge?
   Q. What type of inlet air filter should I use?
   Q. How much power can I save using Turblex?
   Q. How much maintenance does a Turblex blower require?
   Q. What is manufactured at Turblex and what is manufactured at HV-Turbo?

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10 Most Frequently Asked Questions: Answers
   Q.    Why Turblex? It costs more than a multi-stage or PD blower.
   A.    1. Turblex is most efficient. No other compressor produces compressed air at lower power costs. These savings will pay for the difference generally in 2-4 years.

2. Maximum turndown ﾖ internal variable vanes can alter discharge capacity from 100% to 45%, or lower.

3. Low maintenance/long lasting ﾖ pressure oil lubricated bearings and overall superior quality minimizes maintenance and extends operating life.

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   Q.    Why single-stage rather than multi-stage?
   A.    1. Multi-stage has much higher operating (power) costs.

2. Multi-stage only turns-down from about 100% to 75%.

3. Maximum multi-stage discharge pressure is 12-13 psig.

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   Q.    How do I decide which type unit to purchase: single-stage, multi-stage, or positive displacement blower?
   A.    Each type has quite different first cost and very different efficiencies. A life cycle analysis must therefore be conducted, evaluating first cost and operating costs over a 20-year life cycle. And, operating costs must be evaluated at average conditions, not maximum temperatures.

Click HERE for relevant technical paper #56

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   Q.    What are, and why do you use dual vanes?
   A.    Turblex uses variable diffuser vanes (VD) on the discharge side of the impeller to vary air volume from 100% to 45% of capacity. Variable inlet guide vanes (IGV) controlled by a matrix in the local control panelﾒs PLC, optimize inlet air flow rotation to obtain maximum efficiency. The IGVﾒs matrix reacts to ambient temperature, differential pressure, and machine capacity, the three variables that affect efficiency.

Click HERE for relevant technical paper #48

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   Q.    Why does Turblex promote aeration systems (or process) control?
   A.    We have found an overall aeration or process systems efficiency savings up to 10% if proper controls are used. Also, automation reduces manpower and optimizes the process.

Click HERE for relevant technical paper #88

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   Q.    What is surge?
   A.    Similar to hydraulic pump cavitation, it is the rapid backward movement of a specific volume of air through the compressor in 0.2 to 0.4 seconds, repeating this pulsing until the problem is cleared or the unit shuts down. Centrifugal compressors are built to surge hundreds of times, but repeated surging will eventually cause mechanical damage. Surging is most often caused by exceeding the design discharge pressure.
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   Q.    What type of inlet air filter should I use?
   A.    The compressor per se requires only coarse air filtration, most commonly, 93% removal of 10 micron particles. It is the fine bubble wastewater aeration diffusers or industrial process that requires cleaner air. Most fine bubble aeration manufacturers recommend two-stage filters.
first stage ﾖ 93% removal of 10 micron
second stage ﾖ 99.5% removal of 2 micron

Click HERE for relevant technical paper #42

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   Q.    How much power can I save using Turblex?
   A.    Operating installations, upgrades, and retrofits indicate the following:

Converting from positive displacement blower to Turblex saves 30-35%.

Converting from multi-stage to Turblex saves 20%-30%.

Click HERE for relevant technical paper #46

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   Q.    How much maintenance does a Turblex blower require?
   A.    1. Air filter change depends on the air quality, but typically:

Primary ﾖ 6-12 weeks

Secondary ﾖ 18-24 months

3. Change oil filter every 1-2 years

4. Check oil chemistry quarterly; change-out every 5-6 years (after the first 500-hour oil change)

5. Turblex recommends an inspection of the air-end of one unit after 18,000 hours run time to determine internal cleanliness.

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   Q.    What is manufactured at Turblex and what is manufactured at HV-Turbo?
   A.    HV-Turbo manufactures the air end/gearbox that constitutes about 25% (cost) of the overall package. Air-end performance tests are conducted in Helsingor, Denmark, at the H-V Turbo plant. Turblex engineers, designs, and assembles the overall mechanical and instrumentation package to North American engineering standards.
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