Maintenance & Reliability

Vibration Severity (ISO 10816/20816)

Historical ISO 10816-style zone comparison only.

This selection changes review context only. Formulas and example inputs stay unchanged. Check the model assumptions and applicability for the actual process.

Identify the actual asset, process, work boundary, source documents, units and assumptions. Confirm that the selected model or template applies before using its results.

1 Inputs

Minimum: 0

2 Results

Evaluation zone
Zone B
Measured
3.5 mm/s
A/B boundary
2.3 mm/s
B/C boundary
4.5 mm/s
C/D boundary
7.1 mm/s
v RMS ↔ A/B, B/C, C/D
Historical ISO 10816-style zone comparison only. Applicable limits depend on the current machine-specific standard, support, speed and measurement position. Do not derive alarm settings or operating permission from this result; review trends with a qualified specialist.

Worked example

Example values are illustrative. Replace them with your measured data.

InputValue
Measured RMS velocity3.5 mm/s
Machine class (ISO 10816-3)Group 2 (15–300 kW) — flexible support

Evaluation zone: Zone B

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In one line

Historical ISO 10816-style zone comparison only. Applicable limits depend on the current machine-specific standard, support, speed and measurement position. Do not derive alarm settings or operating permission from this result; review trends with a qualified specialist.

Worked example

EXAMPLE

Illustrative values (the calculator defaults), not data from a real site.

Inputs
Measured RMS velocity3.5 mm/s
Machine class (ISO 10816-3)Group 2 (15–300 kW) — flexible support
Results
Evaluation zoneZone B
Measured3.5 mm/s
A/B boundary2.3 mm/s
B/C boundary4.5 mm/s
C/D (alarm)7.1 mm/s

Frequently asked questions

What vibration level is considered too high?

It depends on the machine's size and mounting. As a rough guide for a medium-sized machine, 15–300 kW, on a flexible mount: readings up to about 2.3 mm/s are typical of a newly commissioned machine, 2.3–4.5 mm/s is acceptable for long-term operation, 4.5–7.1 mm/s is unsatisfactory and needs a corrective-action plan, and above 7.1 mm/s risks damage.

Should I use RMS or peak velocity?

ISO 10816/20816 evaluation zones are defined specifically on broadband RMS velocity, so make sure your reading matches — most handheld vibration meters report RMS directly, but double-check your instrument's setting before comparing against these zone limits.

Which machine class should I select if I'm not sure of my equipment's power rating?

Check the motor or machine nameplate for its rated power in kW, and consider how it's mounted, bolted rigidly to a heavy structure versus mounted on a lighter, more flexible frame or springs — both drive which boundary set applies.

What typically causes a jump into Zone C or D?

Common causes include rotor imbalance, shaft misalignment, mechanical looseness, and bearing defects. A single overall RMS reading tells you severity but not cause — a frequency-spectrum (FFT) analysis is usually needed to pinpoint which of these is responsible.

How often should I measure vibration on a given machine?

Frequency should scale with the asset's criticality and how fast its condition can change — critical machines are often monitored continuously or weekly, while less critical equipment might be checked monthly or quarterly as part of a route-based program. Trending the reading over time is generally more valuable than any single measurement.

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