ISO INTERNATIONAL STANDARD 24473 First edition 2008-04-15 Fire tests Open calorimetry Measurement of the rate of production of heat and combustion products for fires of up to 40 Mw Essais au feu - Calorimétrie ouverte - Mesurage de la vitesse de production de chaleur et de produits de combustion dans le cas de feux ayant un débit thermique inférieur ou égal a 40 Mw Reference number ISO 24473:2008(E) ISO @ ISO 2008 by IHS under lic ted without license from IHS Not for Resale ISO 24473:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. . In accepts no liability in this area. Adobe isatrademarkof AdobeSystems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure thatthe file is suitableforuse by IsO member bodies. In the COPYRIGHT PROTECTED DOCUMENT ISO2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ ISO2008-All rights reserved T by IHS unde mitted without license from IHS Not for Resale ISO 24473:2008(E) Contents Page 1 Scope 2 Normative references . 1 3 Terms and definitions .... 2 4 Principle .... 2 5 Hood and exhaust duct ... 3 5.1 Requirements of the hood/duct and extraction system 3 5.2 Laboratory requirements ... 3 6 Instrumentation of the exhaust duct .... 3 6.1 General .. 3 6.2 Volume flow rate ... 3 6.3 Gas temperature 4 6.4 Gas analysis 4 6.5 Optical density ..... 5 7 Additional equipment and procedures 5 7.1 Weigh platform 5 7.2 Heat flux measurements 5 7.3 Data recorder 6 7.4 Timing device 6 8 Heat and smoke release measurement 6 9 Experimental arrangements 6 10 Ignitionsources 6 10.1 General .. 6 10.2 Calibration of gas burners 11 System performance 11.1 HRR measurement confirmation 7 11.2 Systemresponse 8 11.3Precision 8 12 Reliability of data 8 13 Preparation of test specimens 14 Testing ... 9 14.1 Initial conditions. 9 14.2 Procedure . 9 15Testreport 10 Annex A (informative) Design of the hood and exhaust system .... 11 AnnexB(informative)Instrumentationoftheexhaustduct 16 Annex C (informative) Procedure for checking the stability of the oxygen analyser 18 Annex D (informative) Light measuring systems 19 AnnexE(informative)Calculations 21 Annex F (informative) Ignition sources 25 ili Not for Resale