ISO/PAS 24499:2024

FINAL
PUBLICLY ISO/DPAS
DRAFT
AVAILABLE 24499
SPECIFICATION
ISO/TC 86/SC 8
Method of test for burning velocity
Secretariat: ANSI
measurement of A2L flammable gases
Voting begins on:
2023-12-21
Méthode d'essai pour mesurer la vitesse d'inflammabilité des gaz
inflammables A2L
Voting terminates on:
2024-02-15
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/DPAS 24499:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/DPAS 24499:2023(E)
FINAL
PUBLICLY ISO/DPAS
DRAFT
AVAILABLE 24499
SPECIFICATION
ISO/TC 86/SC 8
Method of test for burning velocity
Secretariat: ANSI
measurement of A2L flammable gases
Voting begins on:
Méthode d'essai pour mesurer la vitesse d'inflammabilité des gaz
inflammables A2L
Voting terminates on:
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/DPAS 24499:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/DPAS 24499:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test Method . 2
4.1 General . 2
4.2 Principle of the test method . 2
5 Measurements .4
5.1 General . 4
5.2 Flame propagation velocity . 4
5.3 Flame front area .
...

ISO/DPAS 24499
ISO/TC 86/SC 8
ISO/CD PAS 24499(en)
Secretariat:  ANSI
Date: 2023-12-03
Method of test for burning velocity measurement of A2L
flammable gases
Méthode d'essai pour mesurer la vitesse d'inflammabilité des gaz inflammables A2L
© ISO 2023 – All rights reserved

---------------------- Page: 1 ----------------------
ISO/CD PASDPAS 24499:2023(:(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/CD PASDPAS 24499:2023(:(E)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test Method . 2
4.1 General . 2
4.2 Principle of the test method . 3
5 Measurements . 4
5.1 General . 4
5.2 Flame propagation velocity . 4
5.3 Flame front area . 5
5.4 Cross-sectional area of the flame base . 5
6 Test method . 5
6.1 General . 5
6.2 Gas handling and mixtures preparation . 7
6.3 The test tube . 7
6.3.1 General . 7
6.3.2 Dimensions . 9
6.3.3 Position . 9
6.3.4 Tube ends .
...