ISO INTERNATIONAL 5175-1 STANDARD Second edition 2017-09 Gas welding equipment Safety devices - Part 1: Devices incorporating a flame (flashback) arrestor Materiel de soudage au gaz-Dispositifs de sécurité- Partie1:Dispositifs avecarretdeflamme Reference number IS0 5175-1:2017(E) Tso @IS02017 IS0 5175-1:2017(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2017, Published in Switzerland or by anymeans, electronic ormechanical, 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii IS0 2017-Allrights reserved IS0 5175-1:2017(E) Contents Page Foreword iv 1 Scope 1 2 Normativereferences 1 3 Terms and definitions 4 .4 Design and materials 4.1 Connection.. 4 4.2 Materials. 4 5 Requirements .4 5.1 General 4 5.2 Gastightness 5 5.3 Pressure resistance 6 5.4 Flame arrestor. 6 5.5 Flamearrestorwithnon-returnvalve 6 5.6 Flame arrestor with temperature-sensitive cut-offvalve 6 5.7 Flame arrestor with pressure-sensitive cut-off valve. 6 5.8 Othermultifunctional safetydevices. 6 Methods for type testing. 6 6 6.1 General 6 6.2 Accuracy ofpressureand flowmeasurements 7 6.3 Test gases.. 7 6.4 Gas tightness test 7 6.5 Pressureresistancetest 7 6.6 Non-return valve test. 7 6.7 Flame arrestor test 8 6.8 Temperature-sensitive cut-off valve test 9 6.9 Pressure-sensitive cut-off valve test. .10 6.10 Internal leakage test for cut-off valves. .10 7 Furthertests. .10 Manufacturer's instructions 10 9 Marking .11 AnnexA (informative) Gas flow measurement .12 Annex B (informative) Third party testing information .14 AnnexC(informative)Productiontests .15 @ IS0 2017 - All rights reserved iii