ISO INTERNATIONAL STANDARD 13577-2 Second edition 2023-12 Industrial furnaces and associated processing equipment Safety - Part 2: Combustion and fuel handling systems Fours industriels et équipements associés - Sécurité - Partie 2: Equipement de combustion et de manutention des combustibles Reference number ISO 13577-2:2023(E) ISO @ IS0 2023 IS0 13577-2:2023(E) COPYRIGHT PROTECTED DOCUMENT @IS02023 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 orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS0 2023 - All rights reserved IS0 13577-2:2023(E) Contents Page Foreword vi Introduction .vii 1 Scope. .1 2 Normative references. .2 3 Terms and definitions .4 4 Safety requirements, measures and verification means 4 4.1 General 4 4.1.1 Safety obiectivesandbasicreguirements 4 4.1.2 Over-temperature protection 5 4.1.3 Accumulation of hazardous fluids 6 4.1.4 Seismic protection. 6 4.1.5 Regional requirements 6 4.2 Fuel pipework 6 4.2.1 General 6 4.2.2 Connections 6 4.2.3 Unconnected pipework 8 4.2.4 Galvanic cells 8 4.2.5 Flexible tubing and couplings 8 4.2.6 Marking. 4.2.7 Soundness/tightness 8 4.2.8 Condensate drains on gas pipework 10 4.2.9 Fuel pipe heating 10 4.2.10 Purgepoints 10 4.2.11 Pressure relief devices 10 4.2.12 Blow-off and breather pipes or conduits 10 4.2.13 Equipment supplied with different fuels 11 4.2.14 Bypass. 11 4.2.15 Isolationofrequiredsafetydevices 11 4.3 Required safety devices for gaseous fuels. 11 4.3.1 Manual isolating valve.. 11 4.3.2 Filter/strainer 11 4.3.3 Gas pressure regulator 12 4.3.4 Low gas pressure protection. .12 4.3.5 High gas pressure protection. 13 4.3.6 Automatic shut-off valves. 13 4.3.7 Valve proving 14 4.3.8 Individual manual shut-off valves for burners 15 4.3.9 Flame arrestor. 15 4.4 Gas pressure boosters. 15 4.5 Required safety devices for liquid fuels 16 4.5.1 Manual isolating valve.. 16 4.5.2 Filter/strainer 16 4.5.3 Pressure relief valve. 16 4.5.4 Liquid fuel pressure regulator. 16 4.5.5 Pressure regulation of auxiliary fluids 16 4.5.6 Liquid fuel and auxiliary fluid pressure protection 16 4.5.7 Liquid fuel temperature protection 16 4.5.8 Automatic shut-off valves. .17 4.5.9 Automatic shut-off valves for multiple burners. 17 4.5.10 Individualmanualshut-offvalvesformultipleburners 17 4.6 Combustion air and fuel/air ratio. 18 4.6.1 Combustion air system 18 4.6.2 Air flow and pressure sensing devices 18 @IS02023-Allrightsreserved ii IS0 13577-2:2023(E) 4.6.3 Air/fuelratio 19 4.7 Supply of pre-mixed fuel gas/air 19 4.7.1 Mixture pipework 19 4.7.2 Air and gas supply to the mixture circuit. 19 4.8 Liquid fuel atomisation 20 4.9 Burners. .20 4.9.1 Main burners 20 4.9.2 Radiant tube burner systems. 20 4.9.3 Ignition device/pilot burner 20 4.9.4 Permanent pilots 21 4.9.5 Burner capacity control 21 4.9.6 Flue gas venting. 21 4.9.7 Purge of residual fuel. 21 4.10 Automatic burner control systems 21 4.10.1 General 21 4.10.2 Low-temperature equipment! 22 4.10.3 High-temperature equipment 22 4.10.4 Automatic burner control systems for burners operating in the open air 23 4.10.5 Flame supervision for line-burners 23 4.11 Start-up of the heating system and burner ignition. 23 4.11.1 Pre-purging of the combustion chamber 23 4.11.2 Start-up of the fuel supply 25 4.11.3 Start fuel flow rate. 25 4.11.4 Ignition 25 4.11.5 Maximum safety times for gas-fired natural draught burners 25 4.11.6 Maximum safety times for forced and induced draught gas-fired burners 26 4.11.7 Maximum safety times for liquid fuel fired burners 27 4.11.8 Flame failure on start-up. 28 4.11.9 Flame failure during operation 28 4.12 Multiple fuels. 29 4.12.1