BS EN ISO 5175-1 (2017) FBA's

BS EN ISO 5175-1:2017

BSI Standards Publication

Gas welding equipment - Safety devices Part 1: Devices incorporating a lame (lashback) arrestor

BRITISH STANDARD

BS EN ISO 5175-1:2017

National foreword This Briti British sh Standard Standa rd is the t he UK implementation of EN E N ISO 5175‑ 5175‑1:201 1:2017 7. It is identical to ISO I SO 5175‑ 5175‑1:201 1:2017 7. It supersedes BS EN 730‑1:2002, 730‑1:2002, which wh ich is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/18, Gas welding and cutting appliances. A list of organizations represented represented on this committee can be obtained on request to its secretary. secretar y. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 0 580 92470 5 ICS 25.160.30 Compliance with a British Standard c annot confer immunity from Compliance legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2017. Amendments/corrigenda issued since si nce publication Date

Text affected a ffected

EUROPEAN STANDARD

EN ISO 5175-1

NORME EUROPÉENNE EUROPÄISCHE NORM

November 2017

ICS 25.160.30

Supersedes EN 730‑1:2002

English Version

Gas welding equipment ‑ Safety devices ‑ Part 1: Devices incorporating a flame (flashback) arrestor (ISO 5175‑1:2017) Matériel de soudage au gaz ‑ Dispositifs de sécurité ‑ Partie 1: Dispositifs avec arrêt de lamme (ISO 5175‑1:2017)

Gasschweißgeräte ‑ Sicherheitseinr ichtungen ‑ Teil 1: Mit integrierter Flammensperre (ISO 5175‑1:2017)

This European Standard was approved by CEN on 20 November 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulat ions which stipulate the condit ions for giving this European Standard the status of a national standard without any alteration. Up‑to‑date lists and bibliographical references concerning such national st andards may be obtained on application to the CEN‑CENELEC Management Centre or to any CEN member. This European Standard exists in three oficial versions (English, French, German). A version in any other language made by translation under the responsibilit y of a CEN member into its own langu age and notiied to the CEN‑CENELEC Management Centre has the same status as the oficial versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungar y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN

All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

Ref. No. EN ISO 5175‑1:2017: E

BS EN ISO 5175-1:2017 EN ISO 5175-1:2017 (E)

European foreword This document (EN ISO 5175‑1:2017) has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” the secretariat of which is held by DIN. 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 May 2018, and conlicting national standards shall be withdrawn at the latest by May 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 730‑1:2002. According to the CEN‑CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice

The text of ISO 5175‑1:2017 has been approved by CEN as EN ISO 5175‑1:2017 without any modiication.

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Contents

Page

Foreword ........................................................................................................................................................................................................................................iv 1

Scope .................................................................................................................................................................................................................................1

2

Normative references ...................................................................................................................................................................................... 1

3

Terms and deinitions ..................................................................................................................................................................................... 1

4

Design and materials ....................................................................................................................................................................................... 4 4.1 Connection .................................................................................................................................................................................................. 4 4.2 Materials ....................................................................................................................................................................................................... 4

5

Requirements ..........................................................................................................................................................................................................4 5.1 General ........................................................................................................................................................................................................... 4 5.2 Gas tightness ............................................................................................................................................................................................. 5 5.2.1 External gas tightness ................................................................................................................................................. 5 5.2.2 Internal gas tightness................................................................................................................................................... 5 5.3 Pressure resistance ............................................................................................................................................................................. 5 5.4 Flame arrestor ......................................................................................................................................................................................... 6 5.5 Flame arrestor with non‑return valve ................................................................................................................................ 6 5.6 Flame arrestor with temperature‑sensitive cut‑off valve .................................................................................. 6 5.7 Flame arrestor with pressure‑sensitive cut‑off valve ............................................................................................ 6 5.8 Other multifunctional safety devices ................................................................................................................................... 6

6

Methods for type testing. .............................................................................................................................................................................. 6 6.1 General ........................................................................................................................................................................................................... 6 6.2 Accuracy of pressure and low measurements ........................................................................................................... 6 6.3 Test gases ..................................................................................................................................................................................................... 7 6.4 Gas tightness test .................................................................................................................................................................................. 7 6.5 Pressure resistance test .................................................................................................................................................................. 7 6.6 Non‑return valve test . ........................................................................................................................................................................ 7 6.6.1 General......................................................................................................................................................................................7 6.6.2 Tests with reverse low of gas............................................................................................................................... 7 6.7 Flame arrestor test .............................................................................................................................................................................. 7 6.8 Temperature‑sensitive cut‑off valve test .......................................................................................................................... 8 6.9 Pressure‑sensitive cut‑off valve test ..................................................................................................................................... 9 6.10 Internal leakage test for cut‑off valves ............................................................................................................................ 10

7

Further tests. ..........................................................................................................................................................................................................10

8

Manufacturer’s instructions. .................................................................................................................................................................10

9

Marking .......................................................................................................................................................................................................................10

Annex A (informative) Gas low measurement .......................................................................................................................................12 Annex B (informative) Third party testing information ...............................................................................................................14 Annex C (informative) Production tests .........................................................................................................................................................15

© ISO 2017 – All rights reserved

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non‑governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identiied during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO speciic terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html . This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 8, Equipment for gas welding, cutting and allied processes . This irst edition of ISO 5175‑1, together with ISO 5175‑2, cancels and replaces ISO 5175:1987, which has been technically revised. It also incorporates the Amendment ISO 5175:1987/Amd 1:2015. A list of all parts in the ISO 5175 series can be found on the ISO website. Requests for oficial interpretations of any aspect of this document should be directed to the Secretariat of ISO/TC 44/SC 8 via your national standards body. A complete listing of these bodies can be found at www.iso.org.

iv


BS EN ISO 5175-1:2017 INTERNATIONAL STANDARD

ISO 5175-1:2017(E)

Gas welding equipment — Safety devices — Part 1: Devices incorporating a lame (lashback) arrestor 1 Scope This document speciies the general requirements and tests for safety devices for fuel gases and oxygen or compressed air incorporating a lame (lashback) arrestor used downstream of manifold, cylinder and/or pipeline outlet regulators, and upstream of blowpipes for welding, cutting and allied processes. This document does not specify the location of these devices in the gas system. This document is not applicable to safety devices not incorporating a lame arrestor, covered by ISO 5175‑2. This document does not apply to the use of safety devices incorporating lame 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. 2

Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 554, Standard atmospheres for conditioning and/or testing — Speciications ISO 5175‑2, Gas welding equipment — Safety devices — Part 2: Not incorporating a lame (lashback) arrestor

ISO 7289, Gas welding equipment — Quick-action couplings with shut-off valves for welding, cutting and allied processes

ISO 9090, Gas tightness of equipment for gas welding and allied processes ISO 9539, Gas welding equipment — Materials for equipment used in gas welding, cutting and allied processes ISO 10225, Gas welding equipment — Marking for equipment used for gas welding, cutting and allied processes

ISO 15296, Gas welding equipment —Vocabulary EN 560, Gas welding equipment — Hose connections for equipment for welding, cutting and allied processes 3

Terms and deinitions

For the purposes of this document, the terms and deinitions given in ISO 15296 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at http://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ © ISO 2017 – All rights reserved

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

3.1 lame arrestor

device which arrests a lame front EXAMPLE The good thermal conductivity, high porosity and small pore size (larger surface) of sintered metal elements lead to lame quenching. An example is given in Figure 1.

Key 1 2

3

normal direction of gas low e.g. sintered metal element lame 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 that incorporates two or more of the safety functions EXAMPLE

Flame arrestor (3.1) with non-return valve (3.4) and cut‑off valve.

Note 1 to entry: The temperature-sensitive cut-off valve (3.6) is normally used in combination with a lame arrestor as its purpose is to cut‑off the gas low before the temperature at the lame arrestor reaches a point where lame transmission across the  lame arrestor takes place. It is normal for pressure and or temperature cut‑ off valves only to be used in combination with lame arrestors. Due to the burning characteristics of hydrogen, it is recommended that all  lame arrestors for hydrogen incorporate a temperature‑sensitive cut‑off valve. 3.4 non-return valve

device that prevents passage of gas in the direction opposite to the intended low 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  low. An example is given in Figure 2.

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Key 1

normal direction of gas low Figure 2 — Non-return valve (example)

3.5 pressure-sensitive cut-off valve

device that stops the gas low when the downstream pressure is higher than the upstream pressure by more than a predetermined value EXAMPLE Valve is held open, e.g. by a spring; it is actuated by a pressure wave from downstream and is then automatically held closed by a special device. An example is given in Figure 3.

Key 1 2

normal direction of gas low back‑pressure wave Figure 3 — Pressure-sensitive cut-off valve (example)

3.6 temperature-sensitive cut-off valve

device which stops the gas low when a predetermined temperature is exceeded EXAMPLE

Valve is held open, e.g. by a fusible metal, and actuated by sustained temperature rise. An example

is given in Figure 4.


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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Key 1 2

normal direction of gas low e.g. fusible metal Figure 4 — Temperature-sensitive cut-off valve (example)

3.7 safety device

device which prevents the damage resulting from misuse or malfunction of gas equipment and gas installations 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 ISO 7289. 4.2 Materials

Materials used for safety devices shall conform to the requirements laid down in ISO 9539. 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. Table 1 — Summary of requirements and test sequence for the most commonly available safety devices Safety device function(s)

Flame arrestor Flame arrestor + non‑ return valve

a

4

Requirements (Subclause no.)

5.2.1 5.3 5.4 5.2.1 5.2.2 5.3 5.5

Tests (in test order) (Subclause no.)

6.4 External gas tightness 6.5 Pressure resistance 6.7 Flashback resistance 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse low 6.7 Flashback resistance 6.6 Reverse low

Number of devices required for each test

Total number of devices required

5 1a 5

6

5 1a 5 5 5

6

Use a new device for this test. Do not use for any other test.


BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Safety device function(s)

Requirements (Subclause no.)

Flame arrestor + temperature‑sensitive cut‑off valve

5.2.1 5.2.2 5.3 5.6

Flame arrestor + non‑ return valve + temperature‑sensitive cut‑off valve

5.2.1 5.2.2 5.3 5.5 5.6

Flame arrestor + non‑return valve + pressure‑sensitive cut‑ off valve

5.2.1 5.2.2 5.3 5.5 5.7

Flame arrestor + non‑return valve + temperature‑sensitive cut‑off valve + pressure‑sensitive cut‑off valve

5.2.1 5.2.2 5.3 5.5 5.6 5.7

a

Tests (in test order) (Subclause no.)

6.4 External gas tightness 6.5 Pressure resistance 6.7 Flashback resistance 6.8 Temperature cut‑off 6.10 Internal leakage 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse low 6.7 Flashback resistance 6.6 Reverse low 6.8 Temperature cut‑off 6.10 Internal leakage 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse low 6.7 Flashback resistance 6.9 Pressure cut‑off 6.10 Internal leakage 6.4 External gas tightness 6.5 Pressure resistance 6.6 Reverse low 6.7 Flashback resistance 6.8 Temperature cut‑off 6.9 Pressure cut‑off 6.10 Internal leakage

Number of devices required for each test

Total number of devices required

5 1a 5 1a 5

7

5 1a 5 5 5 1a 5

7

5 1a 5 5 5 5

6

5 1a 5 5 1a 5 5

7

Use a new device for this test. Do not use for any other test.

NOTE In the following subclauses, the terms “upstream” and “downstream” refer to the normal direction of gas low in the device.

5.2 5.2.1

Gas tightness External gas tightness

The general requirements on external gas tightness and the test procedures shall be in accordance with ISO 9090. 5.2.2

Internal gas tightness

Where internal gas tightness is required in this document, the leakage rate shall not exceed 50 cm 3/h for devices with a connection internal bore (diameter) less than 11 mm or 0,41 d 2 for larger diameters (see 6.6 and/or 6.10 for tests). NOTE The value 0,41 d 2 is the low in cm 3/h where d is the internal bore (diameter) in mm of the largest connection of the device.

5.3

Pressure resistance

The housings of the safety devices shall resist a pressure equal to ten times the maximum operating pressure, with the test pressure in all cases not less than 6 MPa (60 bar). NOTE

1 bar = 0,1 MPa = 105 Pa. 1 Pa = 1 N/m 2. All pressures are gauge pressure.

When the device is tested in accordance with 6.5, no permanent deformation of the pressure retaining components shall occur after a test duration of at least 5 min.


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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

5.4

Flame arrestor

Flame arrestors shall quench lashbacks when tested in accordance with 6.7. 5.5

Flame arrestor with non-return valve

Flame arrestor with non‑return valve shall quench lashbacks when tested in accordance with 6.7 and shall not allow the reverse low of gases when tested in accordance with 6.6 both before and after the lashback test in 6.7. 5.6

Flame arrestor with temperature-sensitive cut-off valve

Flame arrestor with temperature‑sensitive cut‑off valve shall quench lashbacks when tested in accordance with 6.7 and shall stop the gas low before the upstream gas is ignited when tested in accordance with 6.8. It shall not be possible to reset the temperature‑sensitive cut‑off valve. If the temperature‑sensitive cut‑off valve operates before the ifth lashback in the test in 6.7 and the lame is not transmitted upstream, the unit shall be considered to meet the lashback test requirement, but the test in 6.8 shall still be carried out on a new unit. 5.7

Flame arrestor with pressure-sensitive cut-off valve

Flame arrestor with pressure‑sensitive cut‑off valve shall quench lashbacks when tested in accordance with 6.7 and the pressure‑sensitive cut‑off function shall activate at each lashback. The pressure‑ sensitive cut‑off valve shall remain closed until it is manually reset. The pressure‑sensitive cut‑off valve shall be reset after each lashback during the test in 6.7. Flame arrestor with pressure‑sensitive cut‑off valve shall also stop the gas low when tested in accordance with 6.9, both before and after completing the  lashback test in 6.7. 5.8

Other multifunctional safety devices

Multifunctional safety devices not included in Table 1, but incorporating functions described in this document or in ISO 5175‑2, shall be tested according to the relevant requirements. Functions in this document shall be tested before the functions in ISO 5175‑2. 6 Methods for type testing 6.1

General

The test methods in this clause are not intended as production inspection tests, but are to be applied to sample devices to be tested for compliance with this document. Tests shall be carried out on new devices with all safety functions operational as designed. Third party conformity testing is not a requirement of this document. See Annex B for information relating to third party conformity test ing if required. 6.2

Accuracy of pressure and low measurements

The allowable total error of the measured values are as follows: — low:

±10 %;

— pressure: ±3 %.

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

All lows and pressures shall be expressed in standard atmospheric conditions in accordance with ISO 554. All pressure values are given as gauge pressure, expressed in bars. 6.3

Test gases

Unless otherwise stated, tests shall be carried out at ambient pressure conditions and at (20 ± 5) °C with air or nitrogen free from oil and grease. Air is considered as oil‑free if it comprises — a mass fraction of oil vapour of less than 5 × 10−6, and — less than 1 mg/m3 of suspended droplets. In all cases, tests shall be carried out with dry gas with a maximum moisture content corresponding to a dew point of 0 °C. Safety devices for hydrogen shall be tested with hydrogen or helium for the gas tightness test only. 6.4

Gas tightness test

Conformity with the requirements of 5.2.1 shall be checked on ive samples in accordance with ISO 9090. 6.5

Pressure resistance test

Conformity with the requirements of 5.3 shall be checked by means of a hydraulic pressure test on one sample. No other tests shall be carried out on the sample either before or after this test nor shall the sample tested be used for any other purposes. 6.6 6.6.1

Non-return valve test General

Conformity with the requirements of 5.5 shall be checked on ive samples as follows. Before proceeding with this test, pass the test gas through the device in the normal direction of low for 5 s to operate the valve. Connect the downstream side of the device under test to a gas source, with the upstream side at atmospheric pressure and connected to a leak detection device. Proceed to pressurize in the reverse direction according to 6.6.2. For the tests, the samples shall be installed in the most disadvantageous position (gravity acting to open the valve). 6.6.2

Tests with reverse low of gas

Pressurize the device in the reverse direction as follows: a) increase the back‑pressure at a rate of 600 Pa/min (6 mbar/min) up to 3 000 Pa (30 mbar); b) increase the back‑pressure within 1 s from 0 to maximum operating pressure. The maximum reverse low during the period of reverse pressure application and for 1 min afterwards shall meet the requirements of 5.2.2. When the device incorporates a pressure‑sensitive cut‑off valve, it is acceptable for the valve to operate during the non‑return valve test. 6.7

Flame arrestor test

A diagram of the test equipment is shown in Figure 5.


7

BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

The gas mixture and pressure for testing lame arrestors depend on the gas application and the maximum operating pressure speciied by the manufacturer (see Table 2). Five lame arrestors shall each be subjected to ive lashbacks with a static mixture of fuel gas and oxygen given in Table 2. Between two lashbacks, a suficient delay is required to return the initial conditions. Each lame arrestor shall prevent the upstream gas igniting for all ive  lashbacks. WARNING — All precaution shall be taken to protect personnel from the effect of ire and explosion.

Dimensions in metres

Key

5

lame detector inlet pressure, p1 sample outlet pressure, p2 steel tube

6

ignition

1 2

3 4

Pressure gauges: class 1,0 at least. a

For connections up to G 3/8 LH (left‑hand thread): internal diameter, d i = 10 mm. For connections larger than G 3/8 LH (left‑hand thread): d i shall be equal to the nominal outlet bore, the steel tube shall be straight. Figure 5 — Test equipment for testing eficiency of  lame arrestors

Table 2 — Gas applications concerning test pressures and test mixtures Gas application

Test pressure

Test mixture volume fraction in percentage % of fuel gas in ox ygen

0,15 MPa (1,5 bar)

32 % to 35 % Acetylene

maximum operating pressure maximum operating pressure maximum operating pressure

13 % to 15 % Propane 40 % to 50 % Hydrogen 80 % to 90 % of stochiometric mixture

Acetylene Oxygen Air

LPG Hydrogen Other fuel gases

6.8

Temperature-sensitive cut-off valve test

A diagram of the test equipment is shown in Figure 6.

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Dimensions in metres

Key 1 2

3 4 5

6 a

fuel gas lame detector sample steel tube needle vale oxygen Internal diameter of tube shall be equal to internal diameter of the outlet of the device. Figure 6 — Test equipment for testing temperature-sensitive cut-off valves

This test is to be carried out on one new unit. The fuel gas used for the test shall be as given in Table 3. Adjust the fuel gas valve so that the lame at the outlet side of the steel tube is stable. Slowly open the oxygen valve until the lame retreats into the tube and device. The cut‑off valve shall automatically cut off the gas low before the upstream gas is ignited. After the cut‑off valve has closed, the device shall be tested in accordance with 6.10 to test for internal leakage. When the device incorporates a pressure‑sensitive cut‑off valve which operates during the test, the pressure‑sensitive cut‑off valve shall be disabled and the test repeated. Table 3 — Test gas for the temperature-sensitive cut-off valve test Gas application

Fuel test gas in oxygen

Acetylene Hydrogen LPG Hydrogen LPG Acetylene Hydrogen LPG

Acetylene

Hydrogen Acetylene Hydrogen Propane

For other fuel gases, the test shall be conducted with t he fuel gas.

6.9

Pressure-sensitive cut-off valve test

The requirements speciied in 5.7 shall be checked on ive samples as follows. Connect the downstream side of the device under test to a gas source, with the upstream side open to the atmosphere. Progressively increase the downstream pressure to check that the device is actuated by a pressure less than or equal to 0,12 MPa (1,2 bar). After the cut‑off valve has closed, the device shall be tested in accordance with 6.10 to test for internal leakage.


9

BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

6.10 Internal leakage test for cut-off valves

With the device under test in the tripped condition, connect the upstream side to a gas source at the maximum operating pressure, with the downstream side open to atmosphere. Check that internal leaks at the device outlet meet the requirement of 5.2.2. 7 Further tests A further test concerning the lame arrestor function is given in Annex C and should be performed. 8 Manufacturer’s instructions When distributed, the safety device shall be accompanied by the manufacturer’s instructions which shall contain, as a minimum, the following information: a) the function of the safety device; b) operational and performance data (maximum working pressure, gas low characteristics; see Annex A); c) permissible types of gas; d) an explanation of the abbreviations marked on the device; e) instruction for installation of equipment [The method of installing these devices (e.g. types selected, order of installation, etc) varies with operating conditions. It is essential to follow the manufacturer’s instructions regarding installation and operation to ensure that the overall pressure drop due to the combination is as low as possible.]; f) procedures to be carried out prior to operation; g) procedures for safe operation; h) instructions in case of malfunction; i)

recommendations for inspection, testing and maintenance;

j)

explanation of the marking.

9 Marking All marking shall be legible and durable. The following information shall be included: a) reference to this document (i.e. ISO 5175‑1); b) the name or trade mark of the manufacturer and/or distributor; c) the model designation or code number relating to the manufacturer’s installation instructions; d) the direction of normal gas low (arrow); e) the name of the gas or its abbreviation; f)

the maximum operating pressure, p max , expressed in bar;

g) the indication of the safety functions incorporated in the device as shown below. Abbreviations for the safety functions shall be marked as follows: — lame arrestor

10

FA


BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

— non‑return valve

NV

— pressure‑sensitive cut‑off valve

PV

— temperature‑sensitive cut‑off valve

TV

The appropriate letters shall be enclosed in a square as in the following examples: lame arrestor only

FA

lame arrestor + non‑return valve

FA NV

lame arrestor + non‑return valve + pressure‑sensitive cut‑off valve

FA NV PV

lame arrestor + non‑return valve + pressure‑sensitive cut‑off valve + temperature‑sensitive cut‑off valve

FA NV PV TV

If the full name of the gas cannot be marked, the letter codes according to ISO 10225 shall be used for marking of equipment. If in addition, a colour coding is used, red shall be used for fuel gases, blue for oxygen, black for compressed air.


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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Annex A

(informative) Gas low measurement

A.1

General

The gas low characteristics for each safety device (single or multifunction) can be measured by means of a performance test using the circuit shown in Figure A.1. The results can be reported graphically; a typical example is shown in Figure A.2. A.2

Procedure

With the device discharging directly to the atmosphere, the upstream pressure should progressively be increased to the maximum operating pressure, p max , and the gas low rate should be measured at different intermediate pressures. The same test should be repeated with upstream pressures equal to 0,25 p max , 0,5 p max and 0,75 p max , and the gas low rate for different pressure drops, Δ p, should be measured. The average of the results obtained from 5 samples shall be considered to be the nominal value. The low rates of the 5 samples should not diverge by more than ±10 %.

Key 1 2

3 4

inlet pressure, p1 outlet pressure, p2 sample low meter Pressure gauges: class 1,0 at least. Pressure drop, Δ p = p1 – p2. Figure A.1 — Typical example of circuit for gas low measurement

12


BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

r a b ,

p  , p o r d e r u s s e r p

x . a m

. a x 5 p . m x 7 m a 0 p 0, 5 p , 5 0 2 0,

flow rate, q v, m³/h

Figure A.2 — Typical example of gas low characteristics


13

BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Annex B

(informative) Third party testing information

B.1

General

Third party testing is not a requirement of this document. Third party testing is used when either the manufacturer or user desire independent veriication of the product. The following is given for guidance only but can vary according to the third party involved. B.2

Samples and documentation

Recommended for third party conformity testing: a) suficient samples to enable the device to be tested (see Table 1); b) two copies of all detail drawings; c) three copies of the general drawing with a list of spare parts; d) a statement by the manufacturer indicating the nature of the materials and their compatibility with the gases.

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BS EN ISO 5175-1:2017 ISO 5175-1:2017(E)

Annex C

(informative) Production tests

C.1

General

The following test should be carried out after manufacture on all safety devices conforming to this document. C.2

Production lashback test

A single lashback test should be carried out on each device. Conditions for the gas mixture for all devices should be as given for acetylene in Table 2 and the equipment used, conforming to the requirements of Figure 5. Devices which do not quench the lashback during this test should be rejected.


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BS EN ISO 5175-1 (2017) FBA's

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