Pump, Compressor & Rotating Equipment Assembly worked example

Vibration Balance Margin with measured achieved balance quality or vibration limit of 310 units: a worked example

This scenario runs the vibration balance margin calculation on the strong side: measured achieved balance quality or vibration limit of 310 units, with every other input held at its documented default. Use it when vibration balance margin in pump, compressor and rotating equipment assembly needs a clean margin number for a pump, compressor and rotating equipment assembly go / no-go review.

The inputs for this scenario

  • Measured achieved balance quality or vibration limit: 310 units (raised for this scenario; the documented default is 125)
  • Required balance grade or acceptance limit: 100 units (unchanged)
  • Reference balance/vibration baseline: 100 units (unchanged)

Working through the calculation

  • Applying the documented formula (Vibration Balance Margin margin = available value - required value) to the inputs above produces each figure below.
  • At this operating point the engine returns 210 % for margin, the number this scenario is built around.
  • At this operating point the engine returns 210 value for absolute margin.
  • At this operating point the engine returns 310 value for available amount.
  • At this operating point the engine returns 100 value for required amount.

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 740% above the baseline at 210 %.
  • Use it at final balance or vibration acceptance to judge how much room a rotor or machine has above its spec limit. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Margin: 210 % (headline result)
  • Absolute margin: 210 value
  • Available amount: 310 value
  • Required amount: 100 value

Run it with your numbers

  • Every input above is editable in the live Vibration Balance Margin calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.