BS ISO BRITISHSTANDARD 18434-1:2008 Condition monitoring and diagnostics of machines Thermography - Part l: General procedures ICS 17.160 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO 18434-1:2008 National foreword This British Standard is the UK implementation of IS0 18434-1:2008. The UK participation in its preparation was entrusted by Technical Committee GME/21, Mechanical vibration, shock and condition monitoring, to SubcommitteeGME/21/7,Conditionmonitoring. A list of organizations represented on this committee can be obtained on request to its 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. This British Standard was Amendments/corrigenda issued since publication published under the authority of the Standards Policy and Date Comments Strategy Committee on 31March 2008 BSI 2008 ISBN9780580552212 BS ISO 18434-1:2008 ISO INTERNATIONAL STANDARD 18434-1 First edition 2008-03-01 Condition monitoring and diagnostics of machines Thermography - Part 1: General procedures Surveillance et diagnostic de I'etat des machines-Thermographie- Partie1:Proceduresgenerales Referencenumber ISO 18434-1:2008(E) ISO ii BSISO18434-1:2008 Contents Page Foreword. iv Introduction V 1 Scope 2 Normative references.. 3 Terms and definitions 4 Thermography techniques.. 5 Comparativethermography... 5.1 Types of comparativethermography.. 5.2 Comparative quantitative thermography 5.3 Comparative qualitative thermography.. 6 Non-contactthermometryusing infraredthermography cameras.. 7 Baseline measurements 8 Safety 6 Calibration 6 10 Datacollection. 6 11 Customer responsibilities... 12 Field measurements of reflected temperature and emissivity and attenuating media.. 13 Temperature severity assessment criteria.... 13.1 Establishingseverityassessmentcriteria. 13.2 Temperaturedifferencecriteria.... 13.3 Maximumpermissibletemperaturecriteria 14 Profile assessment criteria 15 Diagnosis and prognosis... 15.1 Surveyintervals 15.2 Imageinterpretation.. 15.3 Fault identification process... 10 16 Test report 17 Qualificationofpersonnel... AnnexA(normative)Field measurements ofreflectedapparenttemperatureand emissivity.. Annex B (informative)Example safety rules and guidelines.. AnnexC(informative)Casehistoryexamples 18 Bibliography.. .24 ili BSIS018434-1:2008 Foreword ISsO (the International Organization for Standardization) is a worldwide federation of national standards bodies InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization International Standards are drafted in accordance with the rules given in the ISO/lEC 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. Publication as an International Standard requires approval by at least 75%of the member bodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO18434-1waspreparedbyTechnicalCommitteeISO/TC108,Mechanicalvibration,shockand condition monitoring,SubcommitteeSC5,Conditionmonitoringanddiagnosticsofmachines. machines-Thermography: Part1:Generalprocedures Image interpretation and diagnostics is to form the subject of a future Part 2 iv BS ISO 18434-1:2008 Introduction for condition monitoring and diagnostics of machines. IRT can be used to identify and document anomalies for the purposes of condition monitoring of machines. These anomalies are usually caused by such mechanisms as operation, improper lubrication, misalignment, worn components or mechanical loading anomalies. IRT is based on measuring the distribution of radiant thermal energy (heat) emitted from a target surface, and converting this to a map of radiation intensity