ICS 21.120.40                         MED 28

Reaffirmed 2019

(Superseding IS/ISO 1940-2 : 1997)

NATIONAL FOREWORD

This Indian Standard (Part 14) which is identical with ISO 21940-14 : 2012 ‘Mechanical vibration - Rrotor balancing - Part 14: Procedures for assessing balance errors’ 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 1940-2 : 1997 ‘Mechanical vibration - Balance quality requirements for rotors : Part 2 Balance errors’. After publication of this standard, it shall be treated as withdrawn.

The balance quality of a rotor is assessed in accordance with the requirements of ISO 1940-1 or ISO 11342 by measurements taken on the rotor. These measurements might contain errors which can originate from a number of sources. Where those errors are significant, they should be taken into account when defining the required balance quality of the rotor.

Under the general title ‘Mechanical vibration Rotor balancing’, the standard is in ten parts, other parts are following:

Part 1 Introduction

Part 2 Vocabulary

Part 11 Procedures and tolerances for rotors with the rigid behavior

Part 12 Procedures and tolerances for rotors with flexible behavior

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

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 convection

The text of ISO Standard has been 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 while in Indian Standards, the current practice is to use a point (.) as the decimal marker.