(Superseding IS/ISO 11342 : 1998)

Reaffirmed 2021

NATIONAL FOREWORD

This Indian Standard (Part 12) which is identical with ISO 21940-12 : 2016 ‘Mechanical vibration - Rotor balancing - Part 12: Procedures and tolerances for rotors with flexible behaviour’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Mechanical Vibration and Shock Sectional Committee and approval of the Mechanical Engineering Division Council.

This standard will supersedes IS/ISO 11342 : 1998 ‘Mechanical vibration - Methods and criteria for the mechanical balancing of flexible rotors’. After the publication of this standard IS/ISO 11342 : 1998 shall be treated as withdrawn.

ISO 21940 consist of the following parts, under the general title ‘Mechanical vibration - Rotor balancing’:

Part 11 Procedures and tolerances for rotors with rigid behaviour

Part 13 Criteria and safeguards for in-situ balancing for medium and large rotors

Part 14 Procedures for assessing balance errors

Part 21 Description and evaluation of balancing machines

Part 23 Enclosures and other protective measures for the measuring station of balancing machines

Part 31 Susceptibility and sensitivity of machines to unbalance

Part 32 Shaft and fitment key convention

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions and terminologies are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.