BS 848-7-2003 Fans for general purposes - Specifications for balancing and vibration《通用风扇 平衡和振动规范》.pdf

1、BRITISH STANDARD BS 848-7:2003 BS ISO 14694:2003 Fans for general purposes Part 7: Specifications for balancing and vibration ICS 21.120.40; 23.120 Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS 848-7:2003 This British Standard was published under the a

2、uthority of the Standards Policy and Strategy Committee on 14 May 2003 BSI 14 May 2003 ISBN 0 580 41702 6 National foreword This British Standard reproduces verbatim ISO 14694:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Commi

3、ttee MCE/17, Industrial fans, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Cat

4、alogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its c

5、orrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests

6、informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 39 and a back cover. The BSI copyright date displayed in this do

7、cument indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO 14694:2003(E)INTERNATIONAL ADNATSDR ISO 14964 tide tsriFino -300251-30 Indus

8、trial fans Specifications for balance quality and vibration levels Ventilateurs industriels Spcifications pour lquilibrage et les niveaux de vibration Referecne unbmer OSI 49641:002)E(3 OSI 3002INTERNATIONAL STANDARD ISO 14694 First edition 2003-03-15 udnI snaf lairts icepSitacifons rof cnalabq euti

9、lay dna viitarbl noevesl tneVlietaurs dniustriels cpSifcitasnoi ruop qliubilrte ega sel vineaux v edirbitano BS8487:2003Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSIIS:49641 O3002(E) ii BS8487:2003Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:0

10、0 2007, Uncontrolled Copy, (c) BSIIS:49641 O3002(E) iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 2 3 Terms and definitions. 2 4 Symbols and units 7 5 Purpose of the test 8 6 Balance and vibration application categories (BV categories) 9 7 Balancing . 10 7.1 General.

11、 10 7.2 Balance quality grade . 10 7.3 Calculation of permissible residual unbalance 10 8 Fan vibration 11 8.1 Measurement requirements . 11 8.2 Fan support system 15 8.3 Fan vibration limits for tests in manufacturers work-shop . 15 8.4 Fan vibration limits for operation in situ 15 9 Other rotating

12、 components 16 10 Instruments and calibration. 17 10.1 Instruments 17 10.2 Calibration 17 11 Documentation 17 11.1 Balance. 17 11.2 Fan vibration 17 11.3 Certificates. 18 Annex A (informative) Relationship of vibration displacement, velocity and acceleration for sinusoidal motion . 20 Annex B (infor

13、mative) Assembly practices for balancing in a balancing machine. 22 Annex C (informative) Sources of vibrations. 24 Annex D (informative) Equation of vibration . 30 Annex E (informative) Vibration and supports 32 Annex F (informative) Out of balance and bearing reactions 33 Annex G (informative) Con

14、dition monitoring and diagnostic guidelines . 36 Annex H (informative) Suggested relaxation of specified grades and levels 37 Bibliography . 38 BS8487:2003Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSIIS:49641 O3002(E) iv Foreword ISO (the International O

15、rganization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been estab

16、lished has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardizat

17、ion. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting

18、. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such p

19、atent rights. ISO 14694 was prepared by Technical Committee ISO/TC 117, Industrial fans. BS8487:2003Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSIIS:49641 O3002(E) vIntroduction ISO 14694 is a part of a series of standards covering important aspects of fa

20、ns which affect their design, manufacture and use. This series includes ISO 5801, ISO 5802, ISO 12499, ISO 13347, ISO 13348, ISO 13349, ISO 13350, ISO 13351, ISO 14695 and CEN/BTS 2/AH 17. This International Standard addresses the needs of both users and manufacturers of fan equipment for a technica

21、lly accurate but uncomplicated set of information on the subjects of balance precision and vibration levels. Vibration is recognized as an important parameter in the description of the performance of fans. It gives an indication of how well the fan has been designed and constructed and can forewarn

22、of possible operational problems. These problems may be associated with inadequacies of support structures and machine deterioration, etc. Although alternative standards exist which deal with vibration of machines generally (e.g. ISO 10816), they currently have limitations because of their universal

23、 nature, when considering a specific family of machines such as fans, with installed powers below 300 kW. Vibration measurements may therefore be required for a variety of reasons of which the following are the most important: a) design/development evaluations; b) in situ testing; c) as information

24、for a condition-monitoring or machinery health programme (ISO 14695:2003, Annex C gives recommended measuring positions for machinery health measurement); d) to inform the designer of supporting structures, foundations, ducting systems, etc., of the residual vibration which will be transmitted by th

25、e fan into the structure; e) as a quality assessment at the final inspection stage. NOTE All the information which can be obtained from tests conducted in accordance with this International Standard (see Clause 10 of ISO 14695:2003) is neither necessary nor appropriate for quality-grading purposes.

26、Whilst an open inlet/open outlet test may be useful as a quality guide, this International Standard recognizes that the vibration of a fan will be dependent upon the aerodynamic duty specified, which determines the rotational speed and position on the fan. This International Standard should be read

27、in conjunction with ISO 10816-1, ISO 10816-3 and ISO 14695 which describe the methods to be used and the positions of the transducers. When information is required on vibration transmitted to ducting connections or foundations, then this is especially important. The gradings included are such as are

28、 generally recommended for commercially available fans. It is important to remember that vibration testing can be extremely expensive, sometimes considerably in excess of the fans initial cost. Only when the functioning of the installation may be affected should discrete frequency or band limitation

29、s be imposed. The number of test points should also be limited according to the usage envisaged. Readings at the fan bearings are of most importance and for normal quality gradings should be sufficient. BS8487:2003Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c

30、) BSI3002:7848SBLicensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSIINTERNATIONAL STANDARD ISO 14694:2003(E)1Industrial fans Specifications for balance quality and vibration levels 1 Scope This International Standard gives specifications for vibration and balan

31、ce limits of fans for all applications except those designed solely for air circulation, for example, ceiling fans and table fans. However, it is limited to fans of all types installed with a power of less than 300 kW or to a commercially available standard electric motor with a maximum power of 355

32、 kW (following an R20 series). For fans of greater power than this, the applicable limits are those given in ISO 10816-3. Where the fans in an installation have varying powers both above and below 300 kW, and have been the subject of a single contract, then the manufacturer and purchaser shall agree

33、 on the appropriate standard to be used. This should normally be based on the majority of units. Vibration data may be required for a variety of purposes as detailed in Clause 5. The International Standard recognizes that vibrational measurements may be recorded as velocity, acceleration or displace

34、ment either in absolute units or in decibels above a given reference level. The magnitude of vibration measurements may be affected by assembly practices at balancing machines (see Annex B). The preferred parameter is, however, the velocity, in millimeters per second (mm/s). As the conventions vary

35、in different parts of the world, both r.m.s. (root mean square) and peak-to-peak or peak values are given. It should also be remembered that a fan and its parts may be considered as a spring-mass system. An understanding of this fact helps to resolve most vibrational problems (see Annex D). Account

36、has also been taken of the fact that factory tests are usually conducted with the fan unconnected to a ducting system, such that its aerodynamic duty may be considerably different from that during normal operation. It may also be supported on temporary foundations of different mass and stiffness to

37、those used in situ. Accordingly, such tests are specified with vibration measured “filter-in”. In situ tests are specified “filter-out” and as such represent a measure of overall vibration severity. This International Standard covers fan equipment with rigid rotors, generally found in: commercial he

38、ating, ventilating and air conditioning, industrial processes, mine/tunnel ventilation and power-generation applications. Other applications are not specifically excluded. Excluded are installations which involve severe forces, impacts or extreme temperatures. Any or all portions of this Internation

39、al Standard, or modifications thereof, are subject to agreement between the parties concerned. Fan-equipment foundations and installation practices are beyond the scope of this International Standard. Foundation design and fan installation are not normally the responsibilities of the fan manufacture

40、r. It is fully expected that the foundations upon which the fan is mounted will provide the support and stability necessary to meet the vibration criteria of the fan as it is delivered from the factory. Other factors, such as impeller cleanliness, aerodynamic conditions, background vibration, operat

41、ion at speeds other than those agreed upon, and maintenance of the fan, affect the fan-vibration levels but are beyond the scope of this International Standard. This International Standard is intended to cover only the balance or vibration of the fan and does not take into account the effect of fan

42、vibration on personnel, equipment or processes. BS8487:2003 Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled Copy, (c) BSIIS:49641 O3002(E) 2 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer

43、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 254, Belt drives Pulleys Quality, finish and balance ISO 1940-1:1986, Mechanical vibration Balance quality requirements of rigid rotors Part 1: Determi

44、nation of permissible residual unbalance ISO 1940-1: 1) , Mechanical vibration Balance quality requirements of rigid rotors Part 1: Specification and verification of balance tolerances ISO 4863:1984, Resilient shaft couplings Information to be supplied by users and manufacturers ISO 5348:1998, Mecha

45、nical vibration and shock Mechanical mounting of accelerometers ISO 5801:1997, Industrial Fans Performance testing using standardized airways ISO 7919-1, Mechanical vibration of non-reciprocating machines Measurements on rotating shafts and evaluation criteria Part 1: General guidelines ISO 10816-3:

46、1998, Mechanical vibration Evaluation of machine vibration by measurements on non-rotating parts Part 3: Industrial machines with nominal power above 15 kW and nominal speeds between 120 r/min and 15 000 r/min when measured in situ ISO 13348: 2) , Industrial fans Specification of technical data and

47、verification of performance ISO 14695:2003, Industrial fans Method of measurement of fan vibration 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 vibration severity generic term that designates a value, or set of values, such as a maximum va

48、lue, average or r.m.s. value, or other parameter that is descriptive of the vibration NOTE 1 The vibration severity may refer to instantaneous values or to average values. NOTE 2 Adapted from ISO 2041:1990, definition 2.42. 3.2 axis of rotation instantaneous line about which a body rotates NOTE 1 If

49、 the bearing are anisotropic, there is no stationary axis of rotation. NOTE 2 In the case of rigid bearings, the axis of rotation is the shaft axis, but if the bearings are not rigid, this axis of rotation is not necessarily the shaft axis. NOTE 3 Adapted from ISO 1925:2001, definition 1.4. 1) To be published. (Revision of ISO 1940-1:1986) 2) To be published. BS8487:2003 Licensed Copy: Wang Bin, na, Thu Jun 07 00:58:44 GMT+00:00 2007, Uncontrolled