ISO 5175-1:2017
Gas welding equipment — Safety devices — Part 1: Devices incorporating a flame (flashback) arrestor
ISO 5175-1:2017 specifies the general requirements and tests for safety devices for fuel gases and oxygen or compressed air incorporating a flame (flashback) arrestor used downstream of manifold, cylinder and/or pipeline outlet regulators, and upstream of blowpipes for welding, cutting and allied processes.
ISO 5175-1:2017 does not specify the location of these devices in the gas system.
ISO 5175-1:2017 is not applicable to safety devices not incorporating a flame arrestor, covered by ISO 5175‑2.
ISO 5175-1:2017 does not apply to the use of safety devices incorporating flame arrestors for applications with premixed oxy/fuel or air/fuel gas supply systems, e.g. downstream of gas mixers or a generator to produce hydrogen/oxygen mixture by electrolytic decomposition of water.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Design and materials
4.1 Connection
4.2 Materials
5 Requirements
5.1 General
5.2 Gas tightness
5.3 Pressure resistance
5.4 Flame arrestor
5.5 Flame arrestor with non-return valve
5.6 Flame arrestor with temperature-sensitive cut-off valve
5.7 Flame arrestor with pressure-sensitive cut-off valve
5.8 Other multifunctional safety devices
6 Methods for type testing
6.1 General
6.2 Accuracy of pressure and flow measurements
6.3 Test gases
6.4 Gas tightness test
6.5 Pressure resistance test
6.6 Non-return valve test
6.7 Flame arrestor test
6.8 Temperature-sensitive cut-off valve test
6.9 Pressure-sensitive cut-off valve test
6.10 Internal leakage test for cut-off valves
7 Further tests
8 Manufacturer’s instructions
9 Marking
Annex A (informative) Gas flow measurement
Annex B (informative) Third party testing information
Annex C (informative) Production tests
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Design and materials
4.1 Connection
4.2 Materials
5 Requirements
5.1 General
5.2 Gas tightness
5.3 Pressure resistance
5.4 Flame arrestor
5.5 Flame arrestor with non-return valve
5.6 Flame arrestor with temperature-sensitive cut-off valve
5.7 Flame arrestor with pressure-sensitive cut-off valve
5.8 Other multifunctional safety devices
6 Methods for type testing
6.1 General
6.2 Accuracy of pressure and flow measurements
6.3 Test gases
6.4 Gas tightness test
6.5 Pressure resistance test
6.6 Non-return valve test
6.7 Flame arrestor test
6.8 Temperature-sensitive cut-off valve test
6.9 Pressure-sensitive cut-off valve test
6.10 Internal leakage test for cut-off valves
7 Further tests
8 Manufacturer’s instructions
9 Marking
Annex A (informative) Gas flow measurement
Annex B (informative) Third party testing information
Annex C (informative) Production tests