SIST EN 730-1:2003

SLOVENSKI STANDARD
SIST EN 730-1:2003
01-maj-2003
1DGRPHãþD
SIST EN 730:1997
Oprema za plamensko varjenje - Varnostne naprave - 1. del: Z vgrajeno varovalko
proti povratnemu udaru
Gas welding equipment - Safety devices - Part 1: Incorporating a flame (flashback)
arrestor
Gasschweißgeräte - Sicherheitseinrichtungen - Teil 1: Mit integrierter Flammensperre
Matériel de soudage aux gaz - Dispositifs de sécurité - Partie 1: Avec arret de flamme
Ta slovenski standard je istoveten z: EN 730-1:2002
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 730-1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 730-1:2003

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SIST EN 730-1:2003
EUROPEAN STANDARD
EN 730-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2002
ICS 25.160.30
English version
Gas welding equipment - Safety devices - Part 1: Incorporating a
flame (flashback) arrestor
Matériel de soudage aux gaz - Dispositifs de sécurité - Gasschweißgeräte - Sicherheitseinrichtungen - Teil 1: Mit
Partie 1: Avec arrêt de flamme integrierter Flammensperre
This European Standard was approved by CEN on 8 August 2002.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 730-1:2002 E
worldwide for CEN national Members.

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SIST EN 730-1:2003
EN 730-1:2002 (E)
Contents
page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions.4
4 Design and materials.7
4.1 Connection .7
4.2 Materials.7
5 Requirements .7
5.1 General.7
5.2 Gas tightness .9
5.3 Pressure resistance.9
5.4 Flame arrestor .9
5.5 Flame arrestor with non-return valve .9
5.6 Flame arrestor with temperature sensitive cut-off valve.9
5.7 Flame arrestor with pressure-sensitive cut-off valve .9
5.8 Other multifunctional safety devices.10
6 Methods for type testing .10
6.1 General.10
6.2 Accuracy of pressure and flow measurements.10
6.3 Test gases.10
6.4 Gas tightness test.10
6.5 Pressure resistance test .10
6.6 Non-return valve test .11
6.7 Flame arrestor test.11
6.8 Temperature-sensitive cut-off valve test.13
6.9 Pressure-sensitive cut-off valve test .14
6.10 Internal leakage test for cut-off valves .14
7 Further tests .14
8 Manufacturer’s instructions.14
9 Marking .15
Annex A (informative)  Gas flow measurement.17
A.1 General.17
A.2 Procedure .17
Annex B (informative)  Third party testing information.19
B.1 General.19
B.2 Samples and documentation.19
Annex C (informative)  Production tests.20
C.1 General.20
C.2 Production flashback test.20
2

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SIST EN 730-1:2003
EN 730-1:2002 (E)
Foreword
This document EN 730-1:2002 has been prepared by Technical Committee CEN/TC 121 "Welding", the secretariat
of which is held by DS.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by April 2003, and conflicting national standards shall be withdrawn at the latest by
April 2003.
This European Standard “Gas welding equipment – Safety devices” consists of the following Parts:
Part 1: Incorporating a flame (flashback) arrestor.


 Part 2: Not incorporating a flame (flashback) arrestor.
This Part and EN 730-2 supersedes EN 730:1995.
Annexes A, B and C are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,
Sweden, Switzerland and the United Kingdom.
3

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SIST EN 730-1:2003
EN 730-1:2002 (E)
1 Scope
This Part of this European Standard 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.
This standard does not specify the location of these devices in the gas system.
This standard does not include requirements for safety devices which do not incorporate a flame arrestor which are
covered by EN 730-2.
This standard does not cover the use of safety devices incorporating flame arrestors for applications with premixed
oxy/fuel or air/fuel gas supply systems, for example downstream of gas mixers or a generator to produce
hydrogen/oxygen mixture by electrolytic decomposition of water.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 560, Gas welding equipment — Hose connections for equipment for welding, cutting and allied processes.
EN 561, Gas welding equipment — Quick-action coupling with shut-off valves for welding, cutting and allied
processes.
EN 730-2, Gas welding equipment — Safety devices — Part 2: Not incorporating a flame (flashback) arrester.
EN 29090, Gas tightness of equipment for gas welding and allied processes (ISO 9090:1989).
EN 29539, Materials for equipment used in gas welding, cutting and allied processes (ISO 9539:1988).
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications.
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
flame arrestor
device which quenches a flame front
EXAMPLE The good thermal conductivity, high porosity and small pore size (larger surface) of sintered metal elements
lead to flame quenching.
4

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SIST EN 730-1:2003
EN 730-1:2002 (E)
Key
1 Normal direction of gas flow
2 E.g. sintered metal element
3Flame
Figure 1 — Flame arrestor (example)
3.2
maximum operating pressure
maximum pressure to which the equipment may be subjected in service
3.3
multifunctional safety device
device which incorporates two or more of the safety functions
EXAMPLE Flame arrestor with non-return valve and cut-off valve.
NOTE The temperature sensitive cut-off valve is normally used in combination with a flame arrestor as its purpose is to cut-
off the gas flow before the temperature at the flame arrestor reaches a point where flame transmission across the flame arrestor
takes place. It is normal for pressure and or temperature cut-off valves only to be used in combination with flame arrestors. Due
to the burning characteristics of hydrogen it is recommended all flame arrestors for hydrogen incorporate a temperature
sensitive cut-off valve.
3.4
non-return valve
device which prevents passage of gas in the direction opposite to flow
EXAMPLE Valve is held open by energy in gas stream and closes when downstream pressure is approximately equal to
or greater than that in normal direction of flow.
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SIST EN 730-1:2003
EN 730-1:2002 (E)
Key
1 Normal direction of gas flow
Figure 2 — Non-return valve (example)
3.5
pressure-sensitive cut-off valve
device which stops the gas flow in the event of a back-pressure wave from the downstream side
EXAMPLE Valve is held open, e.g. by a spring; it is actuated by a pressure wave from down-stream and is then
automatically held closed by a special device.
Key
1 Normal direction of gas flow
2 Back-pressure wave
Figure 3 — Pressure-sensitive cut-off valve (example)
3.6
temperature-sensitive cut-off valve
device which stops the gas flow when a predetermined temperature is exceeded
EXAMPLE Valve is held open, e.g. by a fusible metal, and actuated by sustained temperature rise.
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SIST EN 730-1:2003
EN 730-1:2002 (E)
Key
1 Normal direction of gas flow
2 E.g. fusible metal
Figure 4 — Temperature-sensitive cut-off valve (example)
3.7
safety device
device for welding equipment which averts risk in case of misuse or malfunction of the down-stream gas welding
equipment
4 Design and materials
4.1 Connection
Threaded connections up to G1 shall be in accordance with EN 560. Quick release connections shall be in
accordance with EN 561.
4.2 Materials
Materials used for safety devices shall conform to the requirements laid down in EN 29539.
5 Requirements
5.1 General
Requirements for each safety device vary depending upon the device and combination of functions in the device. A
summary of the requirements and test sequence is given in Table 1.
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SIST EN 730-1:2003
EN 730-1:2002 (E)
Table 1 — Summary of requirements and test sequence for the most commonly available safety devices
Safety device Require- Tests (in test order) Number of Total number of
function(s) ments devices required devices required
(Clause No)
for each test
(Clause
No)
Flame arrestor 5.2.1 6.4  External gas tightness 5 6
a
5.3 6.5  Pressure resistance 1
5.4 6.7  Flashback resistance
5
Flame arrestor + non- 5.2.1 6.4  External gas tightness 5 6
a
return valve 5.2.2 6.5  Pressure resistance 1
5.3 6.6  Reverse flow 5
5.5 6.7  Flashback resistance 5
6.6  Reverse flow 5
Flame arrestor + 5.2.1 6.4  External gas tightness 5 7
a
temperature sensitive 5.2.2 6.5  Pressure resistance 1
cut-off valve 5.3 6.7  Flashback resistance 5
a
5.6 6.8  Temperature cut-off 1
6.10 Internal leakage
5
Flame arrestor + non- 5.2.1 6.4  External gas tightness 5 7
a
return valve + 5.2.2 6.5  Pressure resistance
1
temperature-sensitive 5.3 6.6  Reverse flow 5
cut-off valve 5.5 6.7  Flashback resistance
5
5.6 6.6  Reverse flow 5
a
6.8  Temperature cut-off
1
6.10 Internal leakage 5
Flame arrestor + non- 5.2.1 6.4  External gas tightness 5 6
a
return valve + 5.2.2 6.5  Pressure resistance 1
pressure-sensitive 5.3 6.6  Reverse flow
5
cut-off valve 5.5 6.
...