Portable fire extinguishers - Part 8: Requirements for the construction, pressure resistance and mechanical tests for extinguishers with a maximum allowable pressure equal to or lower than 30 bar, which comply with the requirements of EN 3-7

This document specifies, as far as the pressure risk is concerned, the rules of design, type testing, fabrication and inspection control of portable fire extinguishers with a metallic body which comply with the requirements of EN 3-7:2004+A1:2007.
This part of EN 3 applies to portable fire extinguishers of which the maximum allowable pressure PS is lower than or equal to 30 bar and containing non-explosive, non-flammable, non-toxic and non-oxidising fluids.
This document also applies to the marking of metallic propellant gas cartridges (see Annex E).
This document does not apply to carbon dioxide fire extinguishers.

Tragbare Feuerlöscher - Teil 8: Anforderungen an die konstruktive Ausführung, Druckfestigkeit und mechanischen Prüfungen für tragbare Feuerlöscher mit einem Höchstdruck kleiner gleich 30 bar, welche die Anforderungen aus EN 3-7 erfüllen

Dieses Dokument legt hinsichtlich der Gefährdung durch Druck die Regeln zur Bemessung, Typprüfung, Herstellung und Inspektionskontrolle tragbarer Feuerlöscher mit Metallbehälten fest, die den Anforderungen nach EN 3-7:2004+A1:2007 entsprechen.
Dieser Teil von EN 3 gilt für tragbare Feuerlöscher, bei denen der maximal zulässige Druck PS kleiner als oder gleich 30 bar ist und die nicht explosive, nicht entzündbare, nicht toxische und nicht oxidierende Fluide enthalten.
Dieses Dokument gilt auch für die Kennzeichnung von Treibgasbehältern aus Metall (siehe Anhang E).
Dieses Dokument gilt nicht für Kohlendioxid-Feuerlöscher.

Extincteurs d’incendie portatifs - Partie 8 : Exigences pour la construction, la résistance à la pression et les essais mécaniques pour extincteurs dont la pression maximale admissible est inférieure ou égale à 30 bar et qui sont conformes aux exigences de l’EN 3-7

Le présent document spécifie, en ce qui concerne les risques liés à la pression, les règles de conception, d’essai de type, de fabrication et d’inspection des extincteurs d’incendie portatifs dont le corps est en métal et qui sont conformes aux exigences de l’EN 3-7:2004+A1:2007.
La présente partie de l’EN 3 s’applique aux extincteurs d’incendie portatifs dont la pression maximale admissible PS est inférieure ou égale à 30 bar et qui renferment des fluides inexplosibles, ininflammables, non toxiques et non oxydants.
Le présent document s’applique également au marquage des cartouches de gaz propulseur métalliques (voir Annexe E).
Le présent document ne s’applique pas aux extincteurs à dioxyde de carbone.

Prenosni gasilniki - 8. del: Zahteve za konstrukcijo, odpornost proti tlaku in mehanski preskusi za gasilnike z največjim dovoljenim tlakom, enakim ali nižjim od 30 bar, ki ustrezajo zahtevam EN 3-7

General Information

Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
18-Aug-2021
Completion Date
18-Aug-2021

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SLOVENSKI STANDARD
oSIST prEN 3-8:2020
01-julij-2020
Prenosni gasilniki - 8. del: Zahteve za konstrukcijo, odpornost proti tlaku in
mehanski preskusi za gasilnike z največjim dovoljenim tlakom, enakim ali nižjim
od 30 bar, ki ustrezajo zahtevam EN 3-7

Portable fire extinguishers - Part 8: Requirements for the construction, pressure

resistance and mechanical tests for extinguishers with a maximum allowable pressure

equal to or lower than 30 bar, which comply with the requirements of EN 3-7

Tragbare Feuerlöscher - Teil 8: Zusätzliche Anforderungen zu EN 3-7 an die konstruktive

Ausführung, Druckfestigkeit, mechanische Prüfungen für tragbare Feuerlöscher mit
einem maximal zulässigen Druck kleiner gleich 30 bar

Extincteurs d’incendie portatifs - Partie 8 : Exigences pour la construction, la résistance à

la pression et les essais mécaniques pour extincteurs dont la pression maximale

admissible est inférieure ou égale à 30 bar et qui sont conformes aux exigences de l’EN

3-7
Ta slovenski standard je istoveten z: prEN 3-8:2020
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 3-8:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 3-8:2020
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oSIST prEN 3-8:2020
DRAFT
EUROPEAN STANDARD
prEN 3-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 13.220.20 Will supersede EN 3-8:2006
English Version
Portable fire extinguishers - Part 8: Requirements for the
construction, pressure resistance and mechanical tests for
extinguishers with a maximum allowable pressure equal
to or lower than 30 bar, which comply with the
requirements of EN 3-7

Extincteurs d'incendie portatifs - Partie 8 : Exigences Tragbare Feuerlöscher - Teil 8: Zusätzliche

pour la construction, la résistance à la pression et les Anforderungen zu EN 3-7 an die konstruktive

essais mécaniques pour extincteurs dont la pression Ausführung, Druckfestigkeit, mechanische Prüfungen

maximale admissible est inférieure ou égale à 30 bar et für tragbare Feuerlöscher mit einem maximal

qui sont conformes aux exigences de l'EN 3-7 zulässigen Druck kleiner gleich 30 bar

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 70.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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 CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3-8:2020:2020 E

worldwide for CEN national Members.
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oSIST prEN 3-8:2020
prEN 1869:2020 (E)
Contents Page

European foreword ............................................................................................................................................ 5

Introduction .......................................................................................................................................................... 6

1 Scope .......................................................................................................................................................... 7

2 Normative references .......................................................................................................................... 7

3 Terms and definitions ......................................................................................................................... 8

4 Symbols and abbreviations ............................................................................................................... 9

5 Design ........................................................................................................................................................ 9

5.1 Design Parameters ............................................................................................................................... 9

5.2 General.................................................................................................................................................... 10

5.3 Bodies ...................................................................................................................................................... 10

5.3.1 General Test Conditions ................................................................................................................... 10

5.3.2 Burst test ................................................................................................................................................ 10

5.3.3 Crushing Test – low temperature (extinguisher bodies only) ............................................ 11

5.3.4 Macroscopic examination of the extinguisher body .............................................................. 11

5.3.5 Requirements for the base .............................................................................................................. 11

5.3.6 Required for use with plastic components ................................................................................ 12

5.4 Fittings (except pressure gauge, as defined in EN 3-7) ......................................................... 12

5.4.1 Conditions .............................................................................................................................................. 12

5.4.2 Requirements ....................................................................................................................................... 12

5.5 Pressure gauge ..................................................................................................................................... 12

5.5.1 Test conditions .................................................................................................................................... 12

5.5.2 Requirements ....................................................................................................................................... 12

5.6 Pressure test (test pressure PT) – extinguisher bodies, fittings and assemblies ........ 13

5.6.1 Test conditions .................................................................................................................................... 13

5.6.2 Requirements – Extinguisher Bodies .......................................................................................... 13

5.6.3 Requirements – Fittings ................................................................................................................... 13

5.6.4 Requirements – Assembly ............................................................................................................... 13

5.7 Overfill pressure test (for water based media cartridge operated extinguishers

only) ......................................................................................................................................................... 13

5.7.1 General.................................................................................................................................................... 13

5.7.2 Conditions .............................................................................................................................................. 13

5.7.3 Requirements ....................................................................................................................................... 13

5.8 Plastics components (subject to pressure) except hoses, and nozzles ........................... 13

5.9 Resistance to impact .......................................................................................................................... 13

5.9.1 Conditions .............................................................................................................................................. 13

5.9.2 Requirements ....................................................................................................................................... 13

5.10 Resistance to Corrosion .................................................................................................................... 14

5.10.1 External corrosion .............................................................................................................................. 14

5.10.2 Resistance to media ........................................................................................................................... 14

5.10.3 Material compatibility ...................................................................................................................... 14

5.11 Filling opening ..................................................................................................................................... 14

5.12 Safety device ......................................................................................................................................... 14

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6 Marking .................................................................................................................................................. 14

6.1 General ................................................................................................................................................... 14

6.2 Extinguisher Body .............................................................................................................................. 14

6.3 Extinguisher assembly ...................................................................................................................... 14

7 Manufacturing, Inspection and testing during production ................................................. 15

7.1 General requirements ....................................................................................................................... 15

7.2 Permanent joining .............................................................................................................................. 15

7.2.1 Introduction ......................................................................................................................................... 15

7.2.2 Welding procedures .......................................................................................................................... 15

7.2.3 Brazing procedures ............................................................................................................................ 15

7.3 Traceability ........................................................................................................................................... 16

7.3.1 Pressure retaining parts .................................................................................................................. 16

7.3.2 Operating devices, filling caps and hose assemblies ............................................................. 16

7.4 Pressure Testing ................................................................................................................................. 16

7.4.1 Personnel ............................................................................................................................................... 16

7.4.2 Proof testing ......................................................................................................................................... 16

7.5 Burst and Crushing tests .................................................................................................................. 16

7.5.1 Extinguisher Bodies ........................................................................................................................... 16

7.5.2 Fittings – subject to pressure ......................................................................................................... 17

7.6 Final Assessment ................................................................................................................................ 18

7.6.1 Test Pressure Verification ............................................................................................................... 18

7.6.2 Final Inspection ................................................................................................................................... 18

8 Materials ................................................................................................................................................ 18

8.1 General ................................................................................................................................................... 18

8.2 Pressure bearing parts ..................................................................................................................... 18

8.3 Non-pressure bearing parts ............................................................................................................ 19

8.4 Plastic Components ............................................................................................................................ 19

8.5 Documentation .................................................................................................................................... 19

9 Propellant Gas Cartridges ................................................................................................................ 19

Annex A (normative) Classification of the different parts of an extinguisher subject to

internal pressure ................................................................................................................................ 20

Annex B (normative) Pressures and temperatures ............................................................................ 21

B.1 The scheme given in Table B.1 illustrate the definitions of pressure given in

Clause 4 .................................................................................................................................................. 21

B.2 The scheme given in Table B.2 illustrate the definitions of temperature given in

Clause 4 and in 6.1.2 .......................................................................................................................... 21

Annex C (normative) Impact test — Resistance to impact by falling weight .............................. 22

C.1 General ................................................................................................................................................... 22

C.2 Apparatus .............................................................................................................................................. 22

C.3 Procedure .............................................................................................................................................. 22

Annex D (normative) Specification for plastics components (except hoses and nozzles) .... 24

D.1 General ................................................................................................................................................... 24

D.2 Requirements for plastics components subject to pressure .............................................. 24

D.2.1 General ................................................................................................................................................... 24

D.2.2 Burst under pressure ........................................................................................................................ 24

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prEN 3-8:2020 (E)

D.2.3 Temperature conditioning at TS ........................................................................................... 25

max

D.2.4 Ageing test – Xenon arc ..................................................................................................................... 25

D.2.5 Impact test after ageing at 20 °C .................................................................................................... 25

D.2.6 Plastic/metal thread design ............................................................................................................ 26

Annex E (normative) Propellant gas cartridges - Marking ............................................................... 28

Annex F (normative) Overfill pressure test ............................................................................................ 29

Annex G (normative) Mechanical strength test (crushing test) ...................................................... 30

G.1 General.................................................................................................................................................... 30

G.2 Long bodies ........................................................................................................................................... 30

G.3 Short bodies .......................................................................................................................................... 31

Annex H (normative) Materials – Quality control documents ......................................................... 33

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2014/68/EU aimed to be covered ............................................ 34

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oSIST prEN 3-8:2020
prEN 3-8:2020 (E)
European foreword

This document (prEN 3-8:2020) has been prepared by Technical Committee CEN/TC 70 “Manual means

of fire fighting equipment”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3-8:2006.

This document has been prepared under a Mandate given to CEN by the European Commission and the

European Free Trade Association and supports essential requirements of EU Directive(s).

For relationship with EU Directive 2014/68/EC, see informative Annex ZA, which is an integral part of

this document.
This document is included in a series of documents covering:
a) classification of fires (EN 2);
b) mobile fire extinguishers (series EN 1866).

EN 3 consists of the following parts, under the general title “Portable fire extinguishers”:

— Part 7: Characteristics, performance requirements and test methods;

— Part 8: Requirements for the construction; pressure resistance and mechanical tests for

extinguishers with a maximum allowable pressure equal to or lower than 30 bar, which comply with

the requirements of EN 3-7;

— Part 9: Requirements for the assembly, construction and pressure resistance of CO extinguishers

which comply with the requirements of EN 3-7;

— Part 10: Provisions for evaluating the conformity of a portable fire extinguisher to EN 3-7.

List of major changes:
The following sections have been revised:
— scope;
— materials;
— design;
— permanent joining;
— relationship with the ESR’s;
— relationship and titles to EN 3 series.
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oSIST prEN 3-8:2020
prEN 3-8:2020 (E)
Introduction
This document is a product standard.

This document is of relevance, in particular, to the following stakeholder groups representing the market

players with regard to pressure equipment safety:
— pressure equipment manufacturers (small, medium and large enterprises);

— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.)

— pressure equipment users/employers (small, medium and large enterprises);
— service providers, e.g. for maintenance (small, medium and large enterprises);

The above-mentioned stakeholder groups have been given the possibility to participate at the drafting

process of this document.
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oSIST prEN 3-8:2020
prEN 3-8:2020 (E)
1 Scope

This document specifies as far as the pressure risk is concerned, the rules of design, type testing,

fabrication and inspection control of portable fire extinguishers with a metallic body which comply with

the requirements of EN 3-7:2004+A1:2007.

This part of EN 3 applies to portable fire extinguishers of which the maximum allowable pressure PS is

lower than or equal to 30 bar and containing non-explosive, non-flammable, non-toxic and non-oxidising

fluids.

This document also applies to the marking of metallic propellant gas cartridges (see Annex E).

This document does not apply to carbon dioxide fire extinguishers.

NOTE Annex A gives the classification of the different parts forming the portable fire extinguisher.

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.

EN 3-7:2004+A1:2007, Portable fire extinguishers - Part 7: Characteristics, performance requirements and

test methods

EN ISO 9017:2018, Destructive tests on welds in metallic materials — Fracture test (ISO 9017:2017)

1 )
EN 10204:2004, , Metallic products — Types of inspection documents
EN 13134:2000, Brazing - Procedure approval

EN ISO 4892-2:2013, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps

(ISO 4892-2:2013)

EN ISO 15614-1:2017, Specification and qualification of welding procedures for metallic materials —

Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys

(ISO 15614-1:2017)

EN ISO 15614-2:2005, Specification and qualification of welding procedures for metallic materials -

Welding procedure test - Part 2: Arc welding of aluminium and its alloys (ISO 15614-2:2005)

EN ISO 15614-12:2014, Specification and qualification of welding procedures for metallic materials —

Welding procedure test — Part 12: Spot, seam and projection welding (ISO 15614-12:2014)

EN ISO 13585:2012, Brazing - Qualification test of brazers and brazing operators (ISO 13585:2012)

EN ISO 14732:2013, Welding personnel - Qualification testing of welding operators and weld setters for

mechanized and automatic welding of metallic materials (ISO 14732:2013)
ISO 14555:2017, Welding — Arc stud welding of metallic materials

This standard is also applicable to non-metallic products (see EN 10204:2004, 1.2).

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oSIST prEN 3-8:2020
prEN 3-8:2020 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
pressure at maximum operating temperature
(pressure experimentally measured)
P (T )
max

pressure measured in the extinguisher after stabilisation during at least 24 h at maximum operating

temperature (T ). For cartridge operated extinguishers, the maximum pressure is the maximum

max

pressure recorded for 0,5 s during a period of three minutes, excluding the first second after release of

the propellant gas
3.2
maximum allowable pressure
(maximum declared pressure)

maximum pressure for which the equipment is designed, as specified by the manufacturer and which is

in any case greater than or equal to P (T )
max

Note 1 to entry: The value of PS for components should be equal to or greater than the value of PS for the

extinguisher assembly.
3.3
bursting pressure
maximum pressure measured during a bursting test
3.4
portable fire extinguisher assembly

assembly of parts to comprise the pressure retaining part of a fire extinguisher which can include a

extinguisher body, operating device, filling cap, closure and may include a propellant gas cartridge, hose

and other components under pressure, if fitted
3.5
maximum operating temperature
max

maximum operating temperature declared by the manufacturer equal to or less than TS

max
3.6
minimum operating temperature
min

minimum operating temperature declared by the manufacturer equal to or higher than TS

min
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prEN 3-8:2020 (E)
3.7
portable fire extinguisher

fire extinguisher which is designed to be carried and operated by hand and which in working order has a

mass of not more than 20 kg
3.8
propellant gas cartridge

refillable or non-refillable pressure receptacle made of metal containing a propellant gas

3.9
fittings

pressure accessories which include operating devices, filling caps and hose assemblies

3.10
allowable temperature

The maximum / minimum temperatures for which the equipment is designed as declared by the

manufacturer
4 Symbols and abbreviations

For the purposes of this document, the following symbols and abbreviations apply.

PS Maximum allowable pressure in bar
PT Test pressure ≥ 1,43 x PS in bar
P Bursting pressure (measured) ≥ 2,7 x PS in bar

D Nominal external diameter of the extinguisher body, or the largest external value of the

perpendicular section to the axis, in mm
D Diameter of the mandrel used during the crushing test in mm
P (T ) Pressure at maximum operating temperature, in bar
max
T Maximum operating temperature declared by the manufacturer, in °C
max
T Minimum operating temperature declared by the manufacturer, in °C
min
S Minimum wall thickness, declared by the manufacturer in mm
TS Minimum allowable temperature, in °C
min
TS Maximum allowable temperature, in °C
max
5 Design
5.1 Design Parameters
The following parameters shall be declared by the manufacturer
— PS of the extinguisher;
— PT of the extinguisher;
— Material characteristics;
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prEN 3-8:2020 (E)
— Specification of manufacturing process;

— Temperature range (see Figure B.2). The allowable temperature range declared for the extinguisher

body shall be TS to TS ;
min max
where:
— TS = −30 °C or lower (as declared by the manufacturer);
min
— TS = +60 °C or higher (as declared by the manufacturer).
max
— Extinguishing media and propellant.
5.2 General

The verification of the product design shall be by prototype testing against 5.3 to 5.9.

The samples used for these tests shall be manufactured using the same materials, processes and

equipment as for the intended production.

The minimum wall thickness (S) required for the body to achieve all the requirements of this standard

shall be declared by the manufacturer.
5.3 Bodies
5.3.1 General Test Conditions
Three specimens shall be tested.

All the bodies and fittings used for the tests shall bear all normal markings indicated in Clause 6 and shall

be in their finished state (e.g. painted).
5.3.2 Burst test
5.3.2.1 Test Conditions
Burst test is performed at 20 ° ± 5 °C.

A burst of the extinguisher body, under hydraulic pressure, shall be carried out at (20 ± 5) °C using an

installation which permits a regular increase of pressure at not more than 2 bar/s until burst occurs and

permits the variation of pressure to be recorded as a function of time.
5.3.2.2 Requirements
— in all tests P shall be greater than 2,7 x PS with a minimum of 20 bar;
— the burst test shall not cause the extinguisher body to fragment;

— the main break shall show no signs of brittleness, for example the edges of the break shall not be

radial, but shall be inclined relative to a diametrical plane and shall have a reduction in area over

their entire thickness and shall occur in the cylindrical (parallel) portion of the extinguisher body;

— the break shall not show any obvious defects in the material;
— the break shall not originate in the extinguisher body marking area or weld;
NOTE The heat affected zone is not considered to be in or part of the weld.
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Should the fracture cross the weld from its point of origin it shall not be considered a failure.

— the burst pressure test shall be carried ou
...

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