A balancing act: Knowing and using the correct rotor specifications - Trade Press Articles - EASA | The Electro•Mechanical Authority
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A balancing act: Knowing and using the correct rotor specifications

  • November 2013
  • Number of views: 5686
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Gene Vogel
EASA Pump & Vibration Specialist

A customer specifies that the rotor is to be balanced to 4W/N. Is that the 4W/N Military specification, or the 4W/N API specification?It could make a big difference. And, how do they compare to the ISO 1940/1 specification (G2.5, G1, etc.)? Fortunately, for symmetrical rotors, comparing the various standards is only a matter of a bit of easy algebra. For non-symmetrical rotors, the process gets a little more difficult because each of the specifications handles these cases differently. The other good news is that there are on-line references that provide graphic and tabulated comparisons.

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