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GB/T 41973-2022Industrial fans - Specifications for balance quality and vibration levels (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 12, 2022

Implementation date

October 12, 2022

Scope

GB/T 41973-2022 (Industrial fans - Specifications for balance quality and vibration levels) is available as an English-translated PDF.

GB/T 41973-2022 is the Chinese standard "Industrial fans - Specifications for balance quality and vibration levels".

Its scope clause reads: This document provides specifications for vibration and balance limits for ventilators for all purposes, except those specifically designed for air circulation, Such as ceiling fans and table fans, but limited to the installed capacity of less than 300kW of all types of fans or the maximum power that can be purchased in the market is 355kW motors (following the R20 series), for fans with a power exceeding this value, the applicable limits are given in ISO 10816-3; when installed When the power of the fan used varies around 300kW and is an item under a single contract, the manufacturer and the purchaser shall The consensus is usually based on the majority opinion of the participating units.

Vibration data may be required for different purposes, see Chapter 5 for details.

If customer is willing to accept lower quality balance vibration level see appendix Record H. This document recognizes that vibration measurements can be recorded as velocity, acceleration or displacement in absolute units or decibels based on a reference value; Dynamically measured values will be affected by the actual installation on the balancing machine (see Appendix B), however the preferred parameter is speed in mm per second (mm/s), given the root mean square (rms) and peak-to-peak or peak values given different customs around the world; it is also advisable to remember that fans and their Components can be viewed as spring-mass systems, an understanding of which helps to solve most vibration problems (see Appendix D).

At the same time, it has been taken into account that the ventilator is often not connected to the ductwork during the factory tests, so that compared with normal operation, the aerodynamic conditions There are significant differences; in addition, temporary foundation supports can also be used, the quality and stiffness of which are also different from those used in the field.

Accordingly, such tests Specified to measure vibration in a "narrow band"; field tests specified a "broad band", which represents a measure of overall vibration severity.

This document covers ventilator equipment with rigid rotors, commonly found in. commercial heating, ventilation and air conditioning, industrial process, mining/tunneling Wind and power generation fields, other fields are not specifically excluded; do not include severe force, shock or extreme temperature applications, for this document The adoption of any part or all of its amendments shall be determined by consultation between the parties involved.

The foundation and actual installation of the ventilator equipment is not within the scope of this document.

The foundation design and the installation of the ventilator are generally not It is assumed by the manufacturer that the foundation used to install the ventilator can provide the required support and stability to meet the ventilation requirements delivered by the factory.

Machine vibration evaluation criteria. Other factors, such as impeller cleanliness, aerodynamic conditions, background vibrations, operating speeds different from those intended, and fan maintenance, can affect vibration levels of the ventilator, but are not within the scope of this document.

This document is intended to cover only the balance and vibration of fans and does not consider the impact of vibration on people, equipment or processes.

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Document preview — GB/T 41973-2022

National Standard of the People's Republic of China

ICS: 23.120
Classification: J 72

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Symbols and Units
5 Test purpose
6 Application Classification of Balance and Vibration (BV Category)
7 Balance
7.1 Overview
7.2 Balance quality level
7.3 Calculation of allowable residual unbalance
8 Fan Vibration
8.1 Measurement requirements
8.2 Fan support system
8.3 Manufacturer's Factory Tested Fan Vibration Limits
8.4 Fan Vibration Limits in Field Operation
9 Other rotating parts
10 Instrumentation and Calibration
10.1 Instrumentation
10.2 Calibration
11 records
11.1 Balance
11.2 Fan Vibration
11.3 Certificate
Appendix A (Informative) Relationship between Vibration Displacement, Velocity and Acceleration for Sinusoidal Motion
Appendix B (Informative) Assembly Guidelines for Balancing on a Balancing Machine
Appendix C (Informative) Vibration Sources
Appendix D (Informative) Vibration Equation
Appendix E (Informative) Vibration and Support
Appendix F (Informative) Unbalance and Bearing Reaction
Appendix G (Informative) Condition Monitoring and Diagnostic Guidelines
Appendix H (Informative) Recommendations for Class and Level Tolerance as Specified

1 Scope

This document provides specifications for vibration and balance limits for ventilators for all purposes, except those specifically designed for air circulation,

Such as ceiling fans and table fans, but limited to the installed capacity of less than 300kW of all types of fans or the maximum power that can be purchased in the market is

355kW motors (following the R20 series), for fans with a power exceeding this value, the applicable limits are given in ISO 10816-3; when installed

When the power of the fan used varies around 300kW and is an item under a single contract, the manufacturer and the purchaser shall

The consensus is usually based on the majority opinion of the participating units.

Vibration data may be required for different purposes, see Chapter 5 for details. If customer is willing to accept lower quality balance vibration level see appendix

Record H.

This document recognizes that vibration measurements can be recorded as velocity, acceleration or displacement in absolute units or decibels based on a reference value;

Dynamically measured values will be affected by the actual installation on the balancing machine (see Appendix B), however the preferred parameter is speed in mm per second (mm/s), given the root mean square (rms) and peak-to-peak or peak values given different customs around the world; it is also advisable to remember that fans and their

Components can be viewed as spring-mass systems, an understanding of which helps to solve most vibration problems (see Appendix D).

There are significant differences; in addition, temporary foundation supports can also be used, the quality and stiffness of which are also different from those used in the field. Accordingly, such tests

Specified to measure vibration in a "narrow band"; field tests specified a "broad band", which represents a measure of overall vibration severity.

This document covers ventilator equipment with rigid rotors, commonly found in. commercial heating, ventilation and air conditioning, industrial process, mining/tunneling

Wind and power generation fields, other fields are not specifically excluded; do not include severe force, shock or extreme temperature applications, for this document

The adoption of any part or all of its amendments shall be determined by consultation between the parties involved.

The foundation and actual installation of the ventilator equipment is not within the scope of this document. The foundation design and the installation of the ventilator are generally not

It is assumed by the manufacturer that the foundation used to install the ventilator can provide the required support and stability to meet the ventilation requirements delivered by the factory.

Machine vibration evaluation criteria.

Other factors, such as impeller cleanliness, aerodynamic conditions, background vibrations, operating speeds different from those intended, and fan maintenance, can affect vibration levels of the ventilator, but are not within the scope of this document.

This document is intended to cover only the balance and vibration of fans and does not consider the impact of vibration on people, equipment or processes.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 9239.1-2006 Mechanical vibration constant state (rigid) rotor balance quality requirements - Part 1.Specifications and balance tolerance

Inspection (ISO 1940-1.2003, IDT)

ISO 254 Belt drive pulley quality, finish and balance (Beltdrives-Puleys-Quality,finishandbal- ance)

GB/T 13277.1 | GB/T 4976 | GB/T 33625 | GB/T 17774 | GB/T 10893 | […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 71 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 9239.1-2006Mechanical vibration—Rotor balancing—Part 1:Introduction

ISO 1940 · ISO 254

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