Reaffirmed 2019

NATIONAL FOREWORD

This Indian Standard (Part 13) which is identical with ISO 21940-13 : 2012 ‘Mechanical vibration - Rotor balancing - Part 13 :Criteria and safeguards for the in-situ balancing for medium and large rotors’ 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.

The Indian Standard supersedes IS/ISO 20806 : 2004 ‘Mechanical Vibration - Criteria safeguards for the in-situ balancing of medium and large rotors’.

Under the general title ‘Mechanical Vibration - Rotor Balancing’ standard is in ten parts.

Other parts are as follows:

Part 1 Introduction

Part 2 Vocabulary

Part 11 Procedures and tolerances for rotors with rigid behaviour

Part 12 Procedures and tolerances for rotors with flexible behaviour

Part 14 Procedures for assessing balance errors

Part 21 Description and evaluation of balancing machines

Part 23 Enclosures and other protective measures for balancing machines

Part 31 Susceptibility and sensitivity of machines to unbalance

Part 32 Shaft and fitment key convention

The text of ISO Standard is to be approved as suitable for publication as an Indian Standard without deviations. Certain conventions 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 in the International Standards, while in Indian Standards the current practice is to use a point (.) as the decimal marker.