ISOStandardsBlogPart 7

Disclaimer: The author is not trying to present himself as an authority on all available CM standards. This blog post is simply an attempt to help those who may be unaware that such guidance exists or of the extent of such standards.


We previously discussed a series of international standards pertaining to condition monitoring of industrial equipment with vibration analysis in, Condition Monitoring & Vibration Classification Standards Awareness: Part 6 ISO 10816-7:2009. This is number 7 in a series of blogs describing a certain family of international standards. The current standard described in this blog is concerned with classifying the vibration of compressors mounted on rigid foundations. The scope (quoted below) is perhaps even more narrow than that of most of the others, and does not offer itself as a condition monitoring tool, but appears to be aimed at helping to identify and avoid fatigue risk for the machine and its related environment.

This standard is titled:

ISO 20816-8:2018

Mechanical vibration — Measurement and evaluation of machine vibration


Part 8: Reciprocating Compressor Systems

The scope of this standard is quoted below from the preview page (quotation in bold):


This document establishes procedures and guidelines for the measurement and classification of mechanical vibration of reciprocating compressor systems. The vibration values are defined primarily to classify the vibration of the compressor system and to avoid fatigue problems with parts in the reciprocating compressor system, i.e. foundation, compressor, dampers, piping and auxiliary equipment mounted on the compressor system. Shaft vibration is not considered.

This document applies to reciprocating compressors mounted on rigid foundations with typical rotational speed ratings in the range 120 r/min up to and including 1 800 r/min. The general evaluation criteria which are presented relate to operational measurements. The criteria are also used to ensure that machine vibration does not adversely affect the equipment directly mounted on the machine, e.g. pulsation dampers and the pipe system.

NOTE The general guidelines presented in this document can also be applied to reciprocating compressors outside the specified speed range but different evaluation criteria might be appropriate in this case.

The machinery driving the reciprocating compressor, however, is evaluated in accordance with the appropriate part of ISO 10816ISO 20816 or other relevant standards and classification for the intended duty. Drivers are not included in this document.

It is recognized that the evaluation criteria might only have limited application when considering the effects of internal machine components, e.g. problems associated with valves, pistons and piston rings might be unlikely to be detected in the measurements. Identification of such problems can require investigative diagnostic techniques which are outside the scope of this document.

Examples of reciprocating compressor systems covered by this document are

  • horizontal, vertical, V-, W- and L-type compressor systems,
  • constant and variable speed compressors,
  • compressors driven by electric motors, gas and diesel engines, steam turbines, with or without a gearbox, flexible or rigid coupling, and
  • dry running and lubricated reciprocating compressors.

This document does not apply to hyper compressors. The guidelines are not intended for condition monitoring purposes. Noise is also outside the scope of this document

To read the ISO’s preview of this standard, click here.

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by Mike Fitch CRL