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1、BS ISO 7919-3:2009 ICS 17.160 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Mechanical vibration Evaluation of machine vibration by measurements on rotating shafts Part 3: Coupled industrial machines Licensed CopyChinese University of Hong Kong, 11/04/2009 0
2、8:55, Uncontrolled Copy, (c) BSI This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2009 BSI 2009 ISBN 978 0 580 64742 0 Amendments/corrigenda issued since publication DateComments BS ISO 7919-3:2009 National foreword This British Stand
3、ard is the UK implementation of ISO 7919-3:2009. It supersedes BS ISO 7919-3:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee GME/21/5, Vibration of machines. A list of organizations represented on this committee can be obtained on request to its
4、secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Unc
5、ontrolled Copy, (c) BSI BS ISO 7919-3:2009 Reference number ISO 7919-3:2009(E) ISO 2009 INTERNATIONAL STANDARD ISO 7919-3 Second edition 2009-02-01 Mechanical vibration Evaluation of machine vibration by measurements on rotating shafts Part 3: Coupled industrial machines Vibrations mcaniques valuati
6、on des vibrations des machines par mesurages sur les arbres tournants Partie 3: Machines industrielles couples Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 ISO 7919-3:2009(E) PDF disclaimer This PDF file may contain embedded typefaces.
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9、for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless
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11、right office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reserved Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 I
12、SO 7919-3:2009(E) ISO 2009 All rights reserved iii Foreword ISO (the International Organization 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. Eac
13、h member body interested in a subject for which a technical committee has been established 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 Internation
14、al Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 Standard
15、s adopted by the technical committees are circulated to the member bodies for voting. 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 o
16、f patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7919-3 was prepared by Technical Committee ISO/TC 108, Mechanical vibration, shock and condition monitoring, Subcommittee SC 2, Measurement and evaluation of mechanical vibration and shock as applie
17、d to machines, vehicles and structures. This second edition cancels and replaces the first edition (ISO 7919-3:1996), of which it constitutes a minor revision. It also incorporates the Technical Corrigendum ISO 7919-3:1996/Cor.1:2007. ISO 7919 consists of the following parts, under the general title
18、 Mechanical vibration Evaluation of machine vibration by measurements on rotating shafts: Part 1: General guidelines Part 2: Land-based steam turbines and generators in excess of 50 MW with normal operating speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min Part 3: Coupled industrial ma
19、chines Part 4: Gas turbine sets with fluid-film bearings Part 5: Machine sets in hydraulic power generating and pumping plants Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 ISO 7919-3:2009(E) iv ISO 2009 All rights reserved Introduction
20、 This part of ISO 7919 specifies guidelines for measuring transverse shaft vibration on coupled industrial machines. Evaluation criteria, based on previous experience, are given for use as guidelines for assessing the vibratory conditions of such machines. A general description of the principles tha
21、t are generally applicable for the measurement and evaluation of shaft vibration of non-reciprocating machines is outlined in ISO 7919-1. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 INTERNATIONAL STANDARD ISO 7919-3:2009(E) ISO 2009 A
22、ll rights reserved 1 Mechanical vibration Evaluation of machine vibration by measurements on rotating shafts Part 3: Coupled industrial machines 1 Scope This part of ISO 7919 gives guidelines for applying evaluation criteria of shaft vibration under normal operating conditions, measured at or close
23、to the bearings of coupled industrial machines. These guidelines are presented in terms of both steady running vibration and any amplitude changes which can occur in these steady values. The numerical values specified are not intended to serve as the only basis for vibration evaluation since, in gen
24、eral, the vibratory condition of a machine is assessed by consideration of both the shaft vibration and the associated structural vibration. This part of ISO 7919 applies to coupled industrial machines with fluid-film bearings, having maximum continuous rated speeds in the range 1 000 r/min to 30 00
25、0 r/min and not limited by size and power, comprising steam turbines, turbocompressors, turbogenerators, turbofans, electric drives and associated gears, where relevant, and rotodynamic pumps (turbo pumps). The information relating to pumps provided in this part of ISO 7919 complements that given in
26、 ISO 10816-7. In particular, the conditions for in-situ operation, performing acceptance tests and the influence of bearing clearance given in ISO 10816-7 shall be taken into account when evaluating the shaft vibration of pumps This part of ISO 7919 is neither applicable to land-based steam turbine-
27、generator sets for power stations with outputs greater than 50 MW (see ISO 7919-2), nor machine sets in hydraulic power generating and pumping plants with outputs of 1 MW or greater (see ISO 7919-5). 2 Normative references The following referenced documents are indispensable for the application of t
28、his document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7919-1, Mechanical vibration of non-reciprocating machines Measurements on rotating shafts and evaluation criteria Part 1:
29、 General guidelines Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 ISO 7919-3:2009(E) 2 ISO 2009 All rights reserved 3 Measurement procedures The measurement procedures to be followed and the instrumentation which shall be used are speci
30、fied in ISO 7919-1. In industrial machines, shaft vibration relative to the bearing is normally measured. Therefore, unless stated otherwise, this part of ISO 7919 always refers to relative vibration displacement. In view of the relatively high rotational speeds involved with industrial machines, me
31、asuring methods using non-contacting transducers are most common and are generally preferred on rotor elements with operating speeds of 3 000 r/min and above. For monitoring purposes the measuring system shall be capable of covering overall vibration up to a frequency equivalent to 2,5 times the max
32、imum service speed. However, it should be noted that for diagnostic purposes it might be desirable to cover a wider frequency range. 4 Evaluation criteria The criteria for vibration magnitude, changes in vibration magnitude and operational limits are given in Annex A. The vibration magnitude is the
33、higher value of the peak-to-peak displacement measured in two selected orthogonal measurement directions. The values presented are the result of experience with machinery of this type and, if due regard is paid to them, acceptable operation can be expected. If only one measuring direction is used, c
34、are should be taken to ensure that it provides adequate information (see ISO 7919-1). The criteria are presented for the specified steady-state operating conditions at the rated speed and load ranges. They apply for normal slow changes in load but do not apply when different conditions exist or duri
35、ng transient changes, for example during start-up and shut-down and when passing through resonance ranges. In these cases alternative criteria are necessary. It should be noted that overall judgement of the vibratory state of a machine is often made on the basis of both shaft relative vibration as d
36、efined above and of measurements made on non-rotating parts (see ISO 10816-3)2. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 ISO 7919-3:2009(E) ISO 2009 All rights reserved 3 Annex A (normative) Evaluation criteria for relative shaft v
37、ibration of coupled industrial machines under specified operating conditions A.1 General Two evaluation criteria are used to assess the relative shaft vibration of coupled industrial machines, measured at or close to the bearings. One criterion considers the magnitude of the observed broad-band rela
38、tive shaft vibration; the second considers changes in magnitude, irrespective of whether they are increases or decreases. Caution should be exercised when using the criteria presented in Annex A to ensure that no contact occurs between the rotating shaft and stationary parts. Therefore, in certain c
39、ases the shaft displacement limits given in this part of ISO 7919 may exceed the available clearance. In such cases the evaluation zone limits should be adjusted accordingly. A.2 Criterion I: Vibration magnitude at rated speed under steady operating conditions This criterion is concerned with defini
40、ng limits for shaft vibration magnitude consistent with acceptable dynamic loads on the bearings, adequate margins on the radial clearance envelope of the machine, and acceptable vibration transmission into the support structure and foundation. The maximum shaft vibration magnitude observed at each
41、bearing is assessed against four evaluation zones established from international experience. A.2.1 Evaluation zones The following typical evaluation zones are defined to permit a qualitative assessment of the shaft vibration of a given machine and to provide guidelines on possible actions. Zone A: T
42、he vibration of newly commissioned machines normally falls within this zone. Zone B: Machines with vibration within this zone are normally considered acceptable for unrestricted long- term operation. Zone C: Machines with vibration within this zone are normally considered unsatisfactory for long-ter
43、m continuous operation. Generally, the machine may be operated for a limited period in this condition until a suitable opportunity arises for remedial action. Zone D: Vibration values within this zone are normally considered to be of sufficient severity to cause damage to the machine. Licensed CopyC
44、hinese University of Hong Kong, 11/04/2009 08:55, Uncontrolled Copy, (c) BSI BS ISO 7919-3:2009 ISO 7919-3:2009(E) 4 ISO 2009 All rights reserved A.2.2 Evaluation zone limits In accordance with present accumulated experience of shaft vibration measurements in this field, the recommended values for t
45、he zone boundaries are inversely proportional to the square root of the maximum operating speed of the shaft, n (in revolutions per minute). The recommended values illustrated in Figure A.1 are derived from Equation (A.1), Equation (A.2) and Equation (A.3): Zone A/B boundary limit, in micrometres (p
46、 p) 4 800mSn = (A.1) Zone B/C boundary limit, in micrometres (p p) 9 000mSn = (A.2) Zone C/D boundary limit, in micrometres (p p) 13 200mSn = (A.3) NOTE For a definition of S(pp), see ISO 7919-1. These values are not intended to serve as acceptance specifications, which shall be subject to agreement
47、 between the machine manufacturer and the customer. However, they provide guidelines for ensuring that gross deficiencies or unrealistic requirements are avoided. In certain cases, there can be specific features associated with a particular machine, which would require different zone boundary values
48、 (lower or higher) to be used. For example, with a tilting pad bearing it might be necessary to specify alternative vibration values, whilst in the case of an elliptical bearing different vibration criteria can apply for the directions of maximum and minimum bearing clearance. In particular, it shou
49、ld be recognized that the allowable vibration can be related to the journal diameter since, generally, running clearances will be greater for larger diameter bearings. Consequently different values can apply for measurements taken at different bearings on the same rotor line. In such cases, it is normally necessary to explain the reasons for this and, in particular, to confirm that the machine will not be endangered by operating with higher vibration values. Higher values of vibration can be permi