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Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 41973-2022: Industrial fans - Specifications for balance quality and vibration levels Status: Valid
Basic dataStandard ID: GB/T 41973-2022 (GB/T41973-2022)Description (Translated English): Industrial fans - Specifications for balance quality and vibration levels Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J72 Classification of International Standard: 23.120 Word Count Estimation: 42,421 Date of Issue: 2022-10-14 Date of Implementation: 2022-10-12 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 41973-2022: Industrial fans - Specifications for balance quality and vibration levels---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Industrial fans -- Specifications for balance quality and vibration levels ICS 23.120 CCSJ72 National Standards of People's Republic of China Specification for Balance Quality and Vibration Levels for Industrial Fans (ISO 14694.2003, IDT) Published on 2022-10-12 2022-10-12 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Symbols and Units 6 5 Test purpose 7 6 Application Classification of Balance and Vibration (BV Category) 8 7 Balance 9 7.1 Overview 9 7.2 Balance quality level 9 7.3 Calculation of allowable residual unbalance 9 8 Fan Vibration 10 8.1 Measurement requirements 10 8.2 Fan support system 13 8.3 Manufacturer's Factory Tested Fan Vibration Limits 13 8.4 Fan Vibration Limits in Field Operation 14 9 Other rotating parts 15 10 Instrumentation and Calibration 16 10.1 Instrumentation 16 10.2 Calibration 16 11 records 16 11.1 Balance 16 11.2 Fan Vibration 16 11.3 Certificate 17 Appendix A (Informative) Relationship between Vibration Displacement, Velocity and Acceleration for Sinusoidal Motion 19 Appendix B (Informative) Assembly Guidelines for Balancing on a Balancing Machine 21 Appendix C (Informative) Vibration Sources 22 Appendix D (Informative) Vibration Equation 28 Appendix E (Informative) Vibration and Support 30 Appendix F (Informative) Unbalance and Bearing Reaction 31 Appendix G (Informative) Condition Monitoring and Diagnostic Guidelines 33 Appendix H (Informative) Recommendations for Class and Level Tolerance as Specified 34 Reference 35 Figure 1 Three-axis direction signal collection position of horizontally installed axial flow fan 11 Fig. 2 Signal collection position of three-axis direction of single-width single-suction (SWSI) centrifugal fan 12 Figure 3 Signal collection position 12 of the three-axis direction of the double-width double-suction (DWDI) centrifugal fan Fig. 4 The three-axis direction signal collection position of the vertically installed axial flow fan 13 Figure 5 Example of Balance and Vibration Report Format 17 Figure A.1 Relationship between vibration displacement, velocity and acceleration for sinusoidal motion 19 Figure F.1 Balance quality level and allowable eccentricity 31 Figure F.2 Dynamic Balance Correction Example 32 Table 1 Ventilator application classification8 Table 2 Balance Quality Level 9 Table 3 Percentage of the total available clearance in the bearing on each axis10 Table 4 Manufacturer's factory tested vibration level limits14 Table 5 Inertial vibration limits for field testing15 Table C.1 Informative data 24 forewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document is identical to ISO 14694.2003 "Specification for Balance Quality and Vibration Level of Industrial Fans". The following minimal editorial changes have been made to this document. ---Chapter 2 List. Delete the ISO 7919-1 that is not quoted in the text, and change ISO 4863.1984 to ISO 4863.1984 according to the citation form in the text ISO 4863, ISO 5348.1998 changed to ISO 5348, ISO 5801.1997 changed to ISO 5801, ISO 13348.2007 changed for ISO 13348; --- Incorporated the amendments to ISO 14694.2003/Amd.1.2010, and the outer margins of the clauses involved use vertical Double lines (‖) are marked. Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Fan Standardization Technical Committee (SAC/TC187). This document is drafted by. Zhejiang Jindun Fan Co., Ltd., Shenyang Blower Research Institute (Co., Ltd.), Anshan Gangfeng Fan Co., Ltd. Responsible company, Guangdong Fanshida Agricultural and Animal Husbandry Fan Co., Ltd., Hunan Liancheng Rail Equipment Co., Ltd., Ningfeng Technology (Ningbo) Co., Ltd., Suzhou Dingyu Energy Saving Equipment Co., Ltd., Wuxi Houde Automation Instrument Co., Ltd., Zhejiang Mingxin Fan Co., Ltd., Zhejiang Pengxiang HVAC Equipment Co., Ltd., Zhejiang Sanxin Technology Co., Ltd., Zhejiang Shuangyang Fan Co., Ltd., Shenyang Blower Group Co., Ltd., Shaoxing Shang Yu ventilator Co., Ltd., Weihai Kleitfeld Fan Co., Ltd. The main drafters of this document. Luo Jianping, Yang Shuhua, Yan Longyin, Gu Zhongli, Hou Zhiquan, Xu Menglei, Wang Bin, Xu Zhiqiang, Zhu Jihong, Lu Miaojun, Pan Xuguang, Ruan Miaoying, Li Yuhong, Xu Lanhuan, Wang Xin.IntroductionThis document is one of a series of standards covering important aspects affecting the design, manufacture and use of ventilators. This series of documents includes ISO 5801, ISO 5802, ISO 12499, ISO 13347, ISO 13348, ISO 13349, ISO 13350, ISO 13351, ISO 14695 and CEN/BTS2/AH17. This document addresses the needs of users and manufacturers of ventilator equipment, and provides technically accurate but complex full profile. In the description of fan performance, vibration is recognized as an important parameter, which expresses the degree to which the fan is designed and constructed. It can provide early warning of possible operating failures, which may be related to insufficient supporting structures, deterioration of equipment conditions, etc. Although there are other standards on general mechanical vibration issues (eg ISO 10816), in the face of problems such as small installed capacity When it is used for a specific type of machinery such as a 300kW fan, there are currently limitations due to its generalized characteristics. Vibration measurements are important for the following reasons. a) design/development evaluation; b) Field testing; c) For condition monitoring or machinery health planning (Appendix C in ISO 14695.2003 gives recommended measuring points for machinery health) information; d) Inform the designers of supporting structures, foundations, piping systems, etc., the amount of residual vibration transmitted by the fan to the structure; e) In the final inspection stage as a quality assessment indicator. NOTE. All information that can be obtained from tests carried out in accordance with this document (see ISO 14695.2003, Chapter 10) is neither necessary nor necessary for use in quality assessment. Not suitable. This document considers that while the open inlet/open outlet test can be used as a quality guide, the vibration of the ventilator will depend on the specified pneumatic The aerodynamic conditions determine the speed and position of the fan. This document, in conjunction with the two standards ISO 10816-3 and ISO 14695, describes the method used and the location of the sensors. This is especially important when providing information on the transmission of vibrations to connecting pipes or foundations. The included grades are generally recommended for commercially available with a purchased ventilator. It is worth noting that vibration testing can be very expensive, sometimes far exceeding the initial investment in a ventilator, only if the unit functions When affected, discrete frequencies or frequency bands will be applied, and the number of measuring points should also be limited according to the application. The readings are the most important and sufficient to reflect the usual quality level. Specification for Balance Quality and Vibration Levels for Industrial Fans1 ScopeThis 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.2 Normative referencesThe 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) ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 41973-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 41973-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 41973-2022_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 41973-2022_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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