AS/NZS 60079.4:2000 A S / N Z S 6 0 0 7 9 . 4
IEC 60079-4:1975 IEC 60079-4:1975/Amd.1:1995 IEC 60079-4A:1970
Australian/New Zealand Standard™ . m o c . l a b o l g i a s . e r o t s o f n i / / : p t t h t a n o i s r e v l l u f e h t s s e c c A . e l p m a s e g a p 7 e e r f a s i s i h T
Electrical apparatus for explosive gas atmospheres Part 4: Method of test for ignition temperature
AS/NZS 60079.4:2000
This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL/14, Electrical Equipment in Hazardous Areas. It was approved on behalf of the Council of Standards Australia on 15 March 2000 and on behalf of the Council of Standards Ne w Zealand on 20 March 2000. I t was publ ished on 26 April 2000.
The following interests are represented on Committee EL/14:
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Association of Consulting Engineers Australia Auckland Regional Chamber of Commerce Australian Association of Certification Bodies Australian Chamber of Commerce and Industry Australian Coal Association Australian Electrical and Electronic Manufacturers Association Australian Gas Association Australian Industry Group Australian Institute of Petroleum Australian Institute of Refrigeration Air Conditioning and Heating Department of Mineral Resources, N.S.W. Department of Mines and Energy, Qld Electricity Supply Association of Australia Institute of Electrical Inspectors Institute of Instrumentation and Control Australia Institution of Engineers Australia Ministry of Commerce New Zealand National Electrical and Communications Association Association New Zealand Association of Marine, Aviation and Power Engineers New Zealand Employers and Manufacturers Manufacturers Association New Zealand Hazardous Areas Electrical Coordinating Committee Regulatory authorities (electrical) WorkCover New South Wales
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This Standard was issued in draft form for comment as DR 99149 .
AS/NZS 60079.4:2000
Australian/New Zealand Standard™ . m o c . l a b o l g i a s . e r o t s o f n i / / : p t t h t a n o i s r e v l l u f e h t s s e c c A . e l p m a s e g a p 7 e e r f a s i s i h T
Electrical apparatus for explosive gas atmospheres Part 4: Method of test for ignition temperature
Originated as AS 1896—1976. Jointly revised and redesi gnated as AS/NZS 60079.4:2000.
COPYRIGHT © St and ard s Au st ral ia /S ta nd ard s Ne w Z eal and All rights are reserved. No part of this work may be r eproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher. Jointly published by Standards Aus tralia International Ltd, PO Box 1055, Strathfield, NSW 2135 and Standards New Zealand, Private B ag 2439, Wellington 6020 ISBN 0 7337 3343 3
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PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL/14, Electrical Equipment in Hazardous Areas, to supersede AS 1896—1976, Method Meth od of test te st for ignition temperature of gases and vapours . This Standard is identical with and has been r eproduced from IEC 60079-4:1975, Electrical apparatus for explosi expl osive ve gas atmosph atmo spheres eres,, Part 4: Method of test for ignition temperature , its Amendment 1:1995, and IEC 60079-4A:1970, First supplement to Publication 60079-4 (1966). A footnote is inc luded on pa ge 5 to highlight t he changes outli ned in Amendment No. 1 t o IEC 60079-4:1975.
. m o c . l a b o l g i a s . e r o t s o f n i / / : p t t h t a n o i s r e v l l u f e h t s s e c c A . e l p m a s e g a p 7 e e r f a s i s i h T
One footnote was added to the first supplement to Publication 79-4 (1996), to provide updated information on the marked values. The objective of this Standard is to set out a method of test for use in the determination of the ignition temperature of a chemically pure vapour or gas in air, at atmospheric pressure. A more compr ehensive list of up dated ignition t emperatures is given in IEC 60079-20:1996, Electri Ele ctri cal apparat app aratus us for explos exp losive ive gas ga s atmosph atm osph eres, ere s, Part 20: Data for flammabl flam mabl e gases gase s and an d vapo urs, relating to the use of electrical apparatus . In the case of discrepancy, the ignition temperature values in IEC 60079-20:1996 take preference over those included in this Standard (see first supplement to Publication 79-4:1966). In January 1997, the IEC commenced numbering its Standards from 60000 by adding 60000 to the number of each existing Standard. This coordinates IEC numbering with ISO numbering. During the transition period an IEC Standard might be identified by its new number or its old number (for example, IEC 60050 or IEC 50). As this Standard is reproduced from an International Standard a full point should be substituted for a comma when referring to a decimal mar ker. The term ‘informative’ has been used in this Standard to define the application of the annex to which it applies. An ‘informative’ annex is only f or information and guidance.
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CONTENTS Page
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Scope............ Scope....................... ...................... ..................... ..................... ...................... ...................... ..................... ..................... ...................... ............. .. 1
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Defini De finitio tions. ns............ ..................... ..................... ...................... ...................... ...................... ..................... ..................... ...................... .................. ....... 1
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Outline Outline of me metho thod d ..................... ................................ ..................... ..................... ...................... ...................... ..................... ................... ......... 1
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Appar Apparatu atus s ..................... ............................... ..................... ...................... ...................... ..................... ..................... ...................... .................... ......... 1
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Proced Procedur ure e ..................... ............................... ..................... ...................... ...................... ..................... ..................... ...................... .................... ......... 3
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Ignitio Ign ition n tem tempe pera ratur ture.................... e.............................. ..................... ...................... ...................... ...................... ..................... ................. ....... 3
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Valid Va lidity ity of resul results ts ...................... ................................. ..................... ..................... ...................... ...................... ..................... ................... ......... 4
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Data....... Da ta........... ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ...... .. 4
Annex Annex A - Furnaces Furnaces ............ .............. ............. .............. ............. .............. ............. .... 5 Figures........... Figures..................... ..................... ...................... ...................... ..................... ..................... ...................... ...................... ..................... .................. ........ 6 First First suppleme supplement nt to Publicati Publication on 79-4 (1966)............. (1966)............. ............. .............. .............. .........14
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NOTES
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STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND ___ ___ ______ ___ Australian/New Zealand Standard Electrical apparatus for explosive gas atmospheres Part 4: Method of test fo r ignition temperature ___ ___ ______ ___ 1 Scope
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This method of test is intended for use in the determination of the ignition temperature of a chemically pure vapour or gas in air at atmospheric pressure.
2 Definitions For the purpose of this standard, the following definitions apply: 2.1 Ignition temperature temperature The lowest temperature at which ignition occurs when the method prescribed in this standard is f ollowed. ollowed. 2.2 Ignition A reaction in the test flask which is evidenced by a clearly perceptible flame and/or explosion, and for which the ignition lag does not exceed 5 min. 2.3 Ignition lag The period which elapses between the instant of completed injection of the sample and ignition.
3 Outline of method A known volume of the product to be tested is injected into a heated open 200 ml Erlenmeyer flask containing air. The contents of the flask are observed in a darkened room until ignition occurs. The test is repeated with different flask temperatures and different sample volumes. The lowest flask temperature at which ignition occurs is taken to be the ignition temperature of the combustible in air at atmospheric pressure.
4 Apparatus The test apparatus is described in the following sub-clauses: 4.1 Test flask The test flask shall be a 200 ml Erlenmeyer flask of borosilicate glass. A chemically clean flask shall be used for tests on each product and for the final series of tests.
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. m o c . l a b o l g i a s . e r o t s o f n i / / : p t t h t a n o i s r e v l l u f e h t s s e c c A . e l p m a s e g a p 7 e e r f a s i s i h T
AS/NZS 60079.4:2000, Electrical apparatus for explosive gas atmospheres Method of test for ignition temperature
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