Source-controlled comparison, not an embedded ISO chart

Controlled Vibration Velocity Boundary Comparison Record

Compare one documented vibration velocity value with three boundaries transcribed from your applicable licensed or approved source. No ISO limits are built in, no machine class is inferred and no alarm, maintenance or shutdown action is generated.

No hard-coded ISO thresholdsExact source record requiredEquality rule declaredNo operating decision

The former chart was not a valid ISO 10816-3 / 20816 implementationIts Class I included machines at or below 15 kW even though the official ISO 10816-3 scope begins above 15 kW. ISO 10816-3:2009 is withdrawn, and the public ISO 20816-3:2022 record does not validate the old class mapping or its twelve embedded boundaries.

Current lifecycle at this reviewISO 20816-1:2016 and ISO 20816-3:2022 remain the current published Parts 1 and 3, both at stage 90.92. Edition 2 FDIS replacements are under development at stage 50.00 and are not current published requirements. Recheck after publication.

Machine and measurement identity

These fields prevent a detached scalar from being treated as an overall machine decision.

Case / report ID

Asset / machine ID

Machine set, coupling, bearings, support and relevant configuration

Rated power and relevant rating basis

Operating speed / range

Operating state, load, process and baseline/change context

Measurement part, location and direction

Quantity, unit and amplitude convention

Frequency band, filters and processing

Instrument, calibration and uncertainty record

Exact source and entered boundaries

Document designation, edition/year and controlled copy ID

Source status

Comparison purpose

Exact clause, table, annex and page plus source-defined machine group

Measured vibration velocity in the declared unit

Exact-boundary convention from the source

Entered A/B boundaryNo default is provided.

Entered B/C boundary

Entered C/D boundary

Accountable reviewer / procedure reference

Evidence gates

The arithmetic can be displayed with incomplete gates, but it is not a reviewed controlled-source comparison until all eight are documented.

Machine scope matches. Machine type, coupling, power, speed, bearing, support and excluded/special configuration checks were performed against the exact source. Source status and controlled copy verified. Current/approved status, edition, amendments and replacement lifecycle are recorded. Boundaries transcribed and independently checked. Exact clause/table/page, group and all three numbers were double-checked from the legal source. Measurement definition matches. Quantity, unit, RMS/peak convention, band, filters, location, direction and operating state match the criterion. Boundary ownership is documented. The source rule for a value exactly equal to A/B, B/C or C/D is recorded. Magnitude and change context reviewed. Baseline/change criteria and applicable manufacturer/operator limits were considered outside this scalar comparison. Measurement quality is adequate. Instrument calibration, mounting, repeatability, uncertainty and external vibration influence are acceptable. Decision procedure is separate. Alarm, maintenance, load and shutdown actions come from approved plant/manufacturer logic and accountable review, not this letter band.

Not compared

Entered-criteria letter band–

Measured vibration velocity–

Entered boundary sequence–

Equality convention–

Comparison rule and strict boundary

This is a general ordered-threshold comparison, not a formula or table issued by ISO.

Required: 0 < T_AB < T_BC < T_CD, all in exactly the same documented unit and convention as X

If equality enters the higher band: A when X < T_AB; B when T_AB <= X < T_BC; C when T_BC <= X < T_CD; D when X >= T_CD

If equality remains in the lower band: A when X <= T_AB; B when T_AB < X <= T_BC; C when T_BC < X <= T_CD; D when X > T_CD

A letter is not an operating instructionThe result is only the band produced by the entered numbers and declared equality rule. It does not establish ISO applicability, overall machine condition, a diagnosis, alarm setpoint, maintenance priority, load reduction or shutdown action.

For a dedicated current-scope evidence package before applying ISO 20816-3, use the Industrial Machinery Vibration Evaluation Evidence Worksheet.

Verified lifecycle and evidence boundary

ID	Vir	Verified public fact	Boundary on this page
S1	ISO 20816-3:2022, Edition 1	Current published Part 3, stage 90.92. Public scope: coupled industrial machinery above 15 kW, 120 to 30 000 r/min; steady values and changes; covered/excluded configurations; machine-generated vibration.	Public record does not expose the former class-I/II/III/IV mapping or twelve numerical boundaries.
S2	ISO/FDIS 20816-3, Edition 2	Under development at stage 50.00 and intended to replace the 2022 edition.	Not a current published requirement; no draft table is reproduced.
S3	ISO 10816-3:2009, Edition 2	Withdrawn in 2022 and revised by ISO 20816-3:2022. Its official scope began above 15 kW and ended at 15 000 r/min.	Cannot validate a current chart or a <=15 kW Class I.
S4	ISO 20816-1:2016, Edition 1	Current published Part 1, stage 90.92. Public scope covers defined methods/limitations, magnitude and change, operational monitoring, acceptance and operational-limit guidance.	Does not make one scalar plus a legacy class a complete machine decision.
S5	ISO/FDIS 20816-1, Edition 2	Under development at stage 50.00 and intended to replace the 2016 edition.	Not yet current; future lifecycle recheck required.
S6	ISO 10816-1:1995, Edition 1	Withdrawn in 2016 and revised by ISO 20816-1:2016; it had replaced ISO 2372 and ISO 3945.	Historical lifecycle only; protected tables are not reproduced.
S7	ISO 2372:1974, Edition 1	Withdrawn in 1995 and revised by ISO 10816-1:1995.	Historical lifecycle only, not current ISO 20816-3 evidence.
S8	Brüel & Kjær, Measuring Vibration, BR 0094-11	Its historical quick-look severity illustration is described as extracted from ISO 2372/2373 and old national recommendations; it separately says frequency analysis is necessary for diagnostic use.	Historical context, not proof of the former web table or automatic actions.

NEEDS_LICENSED_SOURCEExact current numerical criteria, group/support definitions, measurement band and convention, steady-value and change rules, boundary inclusivity and operational-limit guidance require the legally available complete applicable document. No clause, table or limit is guessed here.

Corrections made in this audit

The mislabeled four-class chart was removed

The old Class I through IV model included a <=15 kW class while claiming ISO 10816-3, whose official scope begins above 15 kW. The twelve boundaries are no longer embedded or presented as current ISO 20816 values.

Withdrawn and draft documents are separated from current standards

ISO 10816-1 and ISO 10816-3 are withdrawn. Current ISO 20816-1:2016 and ISO 20816-3:2022 remain published while Edition 2 FDIS replacements are still under development.

Automatic alarm and shutdown language was removed

A scalar band cannot replace plant protection logic, manufacturer limits, change criteria, diagnostics and accountable engineering review.

Measurement and source identity are now explicit

The worksheet records machine/configuration, operating state, location/direction, quantity/unit/convention, frequency processing, instrument/uncertainty and the exact controlled source location.

Boundary equality is no longer hidden

The old code used strict less-than comparisons without documenting which band owns an exact threshold. The replacement requires the rule to be declared from the source.

Unsafe defaults and implicit persistence were removed

No values, classes or limits are prefilled. Automatic calculation, local history, clipboard export and dynamic HTML generation were removed; changed inputs make a result stale.