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| I need 150 CFM at 6 psi at my tank, but my tank is 300 ft away from my blower. What size blower do I need? |
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| A lot depends on your pipe sizes. Airflow through pipe is subject to friction losses just like water. For example, friction loss of 150 CFM flowing through 300' of 3" pipe is around .054" of H20 per foot. This amounts to a loss of 16.2" H2O over 300'. This is equivalent to 0.60 psi of backpressure, which isn't much. However, if you use 2" pipe, the friction loss is around .34" of H2O per foot. This amounts to 102" H2O over 300' or 3.7 psi of backpressure, which is significant. |
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| The extra cost of using larger diameter pipe will be far less than the cost of operating a blower at 9.7 psi (6 + 3.7) versus 6.60 psi (6 + 0.60). To put this in perspective, if you were using an M-D 4005 or Roots 45 blower, operating at the higher pressure would require an additional 4 brake horsepower. USABlueBook can provide charts that show friction loss of air in tubing for different pipe sizes for different airflow rates. |
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