Pump, Compressor & Rotating Equipment Assembly worked example

Vibration Balance Margin with measured achieved balance quality or vibration limit of 63 units: a worked example

This worked example runs the vibration balance margin numbers for a tougher week than the baseline: measured achieved balance quality or vibration limit of 63 units instead of the typical 125 units. Vibration Balance Margin quantifies how much headroom a balanced rotor or assembled machine has above its acceptance limit, as both an absolute margin and a percent of a reference baseline.

The inputs for this scenario

  • Measured achieved balance quality or vibration limit: 63 units (the input this scenario stresses; the baseline uses 125)
  • Required balance grade or acceptance limit: 100 units (held at the documented default)
  • Reference balance/vibration baseline: 100 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Vibration Balance Margin margin = available value - required value.
  • Margin works out to -37 % at these inputs, and this is the headline figure for the scenario.
  • Absolute margin works out to -37 value at these inputs.
  • Available amount works out to 63 value at these inputs.
  • Required amount works out to 100 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where measured achieved balance quality or vibration limit sits at 125 units and the headline result is 25 %, this scenario comes in 248% below the baseline at -37 %.
  • Use it at final balance or vibration acceptance to judge how much room a rotor or machine has above its spec limit. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Margin: -37 % (headline result)
  • Absolute margin: -37 value
  • Available amount: 63 value
  • Required amount: 100 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Vibration Balance Margin calculator, set measured achieved balance quality or vibration limit to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.