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 European Standard specifies the rules of design, type testing, fabrication and inspection control of portable fire extinguishers which comply with the requirements of EN 3 7; with metallic bodies as far as pressure risk is concerned.
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 European Standard also applies to the marking of metallic propellant gas cartridges (see Annex E).
This European Standard does not apply to carbon dioxide fire extinguishers.
NOTE   Annex A gives the classification of the different parts forming the portable fire extinguisher.

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

Diese Europäische Norm legt Regeln zur Bemessung, Typprüfung, Herstellung und Inspektionskontrolle tragbarer Feuerlöscher mit Metallgehäusen fest, die den Anforderungen nach EN 3 7 entsprechen, soweit die Gefährdung durch Druck betrachtet wird.
Der vorliegende 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 oxydierende Stoffe enthalten.
Diese Europäische Norm gilt auch für die Kennzeichnung von Treibgasbehältern aus Metall (siehe Anhang E).
Diese Europäische Norm gilt nicht für Kohlendioxid-Feuerlöscher.
ANMERKUNG   Anhang A enthält die Klassifizierung unterschiedlicher Teile, die den tragbaren Feuerlöscher bilden.

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

La présente Norme européenne définit les règles de conception, d'essais de type, de fabrication et d’inspection des extincteurs d’incendie portatifs conformes aux exigences de l'EN 3-7 dont le corps est en métal, en ce qui concerne les risques liés à la pression.
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 contiennent des fluides inexplosibles, ininflammables, non toxiques et non oxydants.
La présente Norme européenne s'applique également au marquage des cartouches de gaz métalliques (voir Annexe E).
La présente Norme européenne ne s'applique pas aux extincteurs à dioxyde de carbone.
NOTE   L'Annexe A donne la classification des différentes parties constitutives d'un extincteur portatif.

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 ustezajo zahtevam EN 3-7

General Information

Status
Not Published
Current Stage
4098 - Decision to abandon - Enquiry
Due Date
02-Jun-2016
Completion Date
12-Jun-2017

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SLOVENSKI STANDARD
oSIST prEN 3-8:2015
01-september-2015
3UHQRVQLJDVLOQLNLGHO=DKWHYH]DNRQVWUXNFLMRRGSRUQRVWSURWLWODNXLQ
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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: Anforderungen an die konstruktive Ausführung,
Druckfestigkeit und mechanischen Prüfungen für tragbare Feuerlöscher mit einem

maximal zulässigen Druck kleiner gleich 30 bar, welche die Anforderungen aus EN 3-7

erfüllen

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

la pression et les essais mécaniques des extincteurs conformes aux exigences de l'EN 3

-7 dont la pression maximale admissible est inférieure ou égale à 30 bar
Ta slovenski standard je istoveten z: prEN 3-8 rev
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 3-8:2015 en,fr,de

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

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oSIST prEN 3-8:2015
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oSIST prEN 3-8:2015
EUROPEAN STANDARD
DRAFT
prEN 3-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2015
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 pour Tragbare Feuerlöscher - Teil 8: Anforderungen an die

la construction, la résistance à la pression et les essais konstruktive Ausführung, Druckfestigkeit und mechanischen

mécaniques des extincteurs conformes aux exigences de Prüfungen für tragbare Feuerlöscher mit einem maximal

l'EN 3-7 dont la pression maximale admissible est inférieure zulässigen Druck kleiner gleich 30 bar, welche die

ou égale à 30 bar Anforderungen aus EN 3-7 erfüllen

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3-8:2015 E

worldwide for CEN national Members.
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oSIST prEN 3-8:2015
prEN 3-8:2015 (E)
Contents Page

Foreword ..............................................................................................................................................................4

1 Scope ......................................................................................................................................................5

2 Normative references ............................................................................................................................5

3 Terms and definitions ...........................................................................................................................6

4 Symbols and abbreviations ..................................................................................................................7

5 Materials .................................................................................................................................................7

5.1 General ....................................................................................................................................................7

5.2 Pressure bearing parts ..........................................................................................................................7

5.3 Non-pressure bearing parts ..................................................................................................................8

5.4 Plastic components ...............................................................................................................................8

5.5 Documentation .......................................................................................................................................8

6 Design method – Extinguisher Bodies ................................................................................................8

6.1 General ....................................................................................................................................................8

6.1.1 Design .....................................................................................................................................................8

6.1.2 Temperature range ................................................................................................................................8

6.1.3 Design of openings................................................................................................................................8

6.2 Calculation ..............................................................................................................................................8

6.2.1 Extinguisher Bodies – Requirements for the extinguisher body .....................................................8

6.2.2 Extinguisher Bodies – Requirements for the base ............................................................................9

6.3 Bodies – Required for use with plastic components .........................................................................9

7 Prototype Testing ..................................................................................................................................9

7.1 General ....................................................................................................................................................9

7.2 Burst Test – low temperature ...............................................................................................................9

7.2.1 General ....................................................................................................................................................9

7.2.2 Extinguisher Bodies ..............................................................................................................................9

7.2.3 Fittings (except pressure indicating devices – as defined in EN 3 part 7) ................................... 10

7.2.4 Pressure test – Pressure gauges and pressure indicators ............................................................ 10

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

7.3.1 General ................................................................................................................................................. 11

7.3.2 Conditions ........................................................................................................................................... 11

7.3.3 Requirements ...................................................................................................................................... 11

7.4 Pressure test (test pressure PT) – extinguisher bodies, fittings and assemblies ....................... 11

7.4.1 Test conditions ................................................................................................................................... 11

7.4.2 Requirements – Extinguisher Bodies ............................................................................................... 11

7.4.3 Requirements – Fittings ..................................................................................................................... 11

7.4.4 Requirements – Assembly ................................................................................................................. 12

7.5 Macroscopic examination of the extinguisher body ....................................................................... 12

7.5.1 Conditions ........................................................................................................................................... 12

7.5.2 Requirements ...................................................................................................................................... 12

7.6 Overfill pressure test (for water based media cartridge operated extinguishers only) .............. 12

7.6.1 General ................................................................................................................................................. 12

7.6.2 Conditions ........................................................................................................................................... 12

7.6.3 Requirements ...................................................................................................................................... 12

7.7 Plastics components (subject to pressure) except hoses, and nozzles....................................... 12

7.8 Resistance to impact .......................................................................................................................... 12

7.8.1 Conditions ........................................................................................................................................... 12

7.8.2 Requirements ...................................................................................................................................... 12

7.9 Pressure cycling test (for extinguisher bodies with P < 55 bar) ................................................... 12

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prEN 3-8:2015 (E)

7.9.1 General ................................................................................................................................................. 12

7.9.2 Conditions ............................................................................................................................................ 13

7.9.3 Requirements ....................................................................................................................................... 13

8 Manufacturing, Inspection and testing during production ............................................................. 13

8.1 Requirements ....................................................................................................................................... 13

8.1.1 General ................................................................................................................................................. 13

8.1.2 Welding procedures ............................................................................................................................ 13

8.1.3 Brazing procedures ............................................................................................................................. 13

8.1.4 Traceability ........................................................................................................................................... 13

8.2 Pressure Testing ................................................................................................................................. 14

8.2.1 Personnel ............................................................................................................................................. 14

8.2.2 Proof testing ........................................................................................................................................ 14

8.3 Burst and Crushing tests ................................................................................................................... 15

8.3.1 Extinguisher Bodies ............................................................................................................................ 15

8.3.2 Fittings – subject to pressure ............................................................................................................ 16

8.4 Final inspection ................................................................................................................................... 16

9 Marking ................................................................................................................................................. 17

9.1 General ................................................................................................................................................. 17

9.2 Extinguisher Body ............................................................................................................................... 17

9.3 Extinguisher ......................................................................................................................................... 17

9.4 Propellant Gas Cartridges .................................................................................................................. 17

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

pressure ............................................................................................................................................... 18

Annex B (normative) Pressures and temperatures ..................................................................................... 19

Annex C (normative) Impact test — Resistance to impact by falling weight ............................................ 20

Annex D (normative) Specification for plastics components (except hoses and nozzles) .................... 22

Annex E (normative) Propellant gas cartridges - Marking ......................................................................... 26

Annex F (normative) Overfill pressure test.................................................................................................. 27

Annex G (normative) Mechanical strength test (crushing test).................................................................. 28

Annex H (normative) Materials – Quality control documents .................................................................... 31

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

Requirements of EU Directive 97/23/EC ............................................................................................ 32

Table 1 — Number of extinguisher bodies to be sampled ........................................................................... 14

Table 2 — Batch sampling plan following failure.......................................................................................... 14

Table 3 — Number of fittings subject to pressure to be sampled ............................................................... 15

Table 4 — Batch sampling plan following failure.......................................................................................... 16

Table A.1 — Classification............................................................................................................................... 18

Table D.1 — Schedule of Testing for Pressure bearing Components ........................................................ 22

Table D.2 — Drop height for hammer test ..................................................................................................... 24

Table H.1 Inspection documents .................................................................................................................... 30

Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC ...................... 31

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oSIST prEN 3-8:2015
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Foreword

This document (prEN 3-8:2015) 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 97/23/EC, see informative Annex ZA, which is an integral part of this

document.
This document is included in a series of European Standards planned to cover:
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 less 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

Annexes B, C, D, E, F and G are normative; Annexes A and ZA are informative.
The following sections have been revised:
— scope;
— materials;
— design method;
— permanent joining;
— relationship with the ESR’s;
— relationship and titles to EN 3 series.
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oSIST prEN 3-8:2015
prEN 3-8:2015 (E)
1 Scope

This European Standard specifies the rules of design, type testing, fabrication and inspection control of

portable fire extinguishers which comply with the requirements of EN 3-7; with metallic bodies as far as

pressure risk is concerned.

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

This European Standard 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, in whole or in part, are normatively referenced in this document and are

indispensable for its application. 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 10204:2004 , Metallic products — Types of inspection documents

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

(ISO 4892-2:2013)

EN ISO 9017:2013, Destructive tests on welds in metallic materials — Fracture test (ISO 9017:2001)

EN ISO 9606-1:2013, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1:2012

including Cor 1:2012)

EN ISO 9606-2:2004, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium

alloys (ISO 9606-2:2004)

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)

EN ISO 15614-1:2004, 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 15614-1:2004)

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)

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

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oSIST prEN 3-8:2015
prEN 3-8:2015 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 3-7:2004+A1:2007 and the following

apply.

NOTE Schemes illustrating the different pressures and temperatures is given in Annex B.

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 ) and for cartridge operated extinguishers, the maximum pressure is the maximum pressure

max

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
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

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oSIST prEN 3-8:2015
prEN 3-8:2015 (E)
3.9
fittings

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

4 Symbols and abbreviations

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

PS Maximum allowable pressure in bar
Test pressure = 1,43 x PS in bar
P Bursting pressure (measured) - 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
Maximum operating temperature declared by the manufacturer, in °C
max
T Minimum operating temperature declared by the manufacturer, in °C
min
Minimum wall thickness, in mm
TS Minimum allowable temperature, in °C
min
TS Maximum allowable temperature, in °C
max
R 2)
Ultimate tensile strength , in MPa (N/mm )
5 Materials
5.1 General

The materials shall be suitable for the intended use. All materials used in the extinguisher assembly shall be

compatible with all other components including extinguishing media. Assemblies shall meet the requirements

of EN 3-7:2004+A1:2007, 14.1, Resistance to external corrosion, and additionally for water based media

EN 3-7:2004+A1:2007, 14.2, Resistance to extinguishing medium of extinguishers using water based media.

Particular attention shall be given to incompatibilities produced for example by:

— galvanic corrosion;
— stress corrosion.
5.2 Pressure bearing parts

The materials used for pressure bearing parts shall be defined in a detailed specification which forms an

integrated part of the design.
This specification shall contain at least detailed descriptions of:
— all raw materials used, including the normal production tolerances;

— all processes used, the process parameters and the normal admissible process tolerances;

Guaranteed by the manufacturer after all manufacturing processes have been carried out on the final product.

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prEN 3-8:2015 (E)
— the relevant required material properties after processing.
5.3 Non-pressure bearing parts

The materials used for non-pressure bearing parts and accessories of extinguishers shall be compatible with

the materials used for the pressure bearing parts.
5.4 Plastic components
Plastic components shall fulfil the clauses of Annex D except hoses and nozzles.
5.5 Documentation

For the materials, used in the type testing and type approval, inspection documents in accordance with

Annex H shall be provided.
6 Design method – Extinguisher Bodies
6.1 General
6.1.1 Design

The design shall be by calculation and verified by experimental data, see Clause 7.

6.1.2 Temperature range

The allowable temperature range declared for the extinguisher body shall be TS to TS where:

min max
— TS = − 30 °C or lower as declared by the manufacturer;
min
— TS = + 60 °C or higher as declared by the manufacturer.
max

Where this is the case, the temperatures and pressures used in this European Standard shall be amended to

reflect this new temperature range and the new parameters at these temperatures.
6.1.3 Design of openings

The main closure of the fill opening, intended to be removed during service or maintenance, shall be provided

with an automatic means of venting any pressure from the extinguisher.

The initial venting of any pressure shall occur when the means of securing the closure, or pressure retaining

part, is disengaged by not more than one third of the full engagement.
The minimum number of turns for the complete removal of the closure shall be 2¼.
The filling opening shall have a minimum diameter of:

i) 20 mm for extinguishers with a nominal charge of less than or equal to 3 kg or 3 l;

ii) 25 mm for extinguishers with a nominal charge of more than 3 kg or 3 l.
6.2 Calculation
6.2.1 Extinguisher Bodies – Requirements for the extinguisher body

The extinguisher body shall have a measured wall thickness which is equal to or greater than the wall

thickness calculated using the following formula:
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oSIST prEN 3-8:2015
prEN 3-8:2015 (E)
(2,7××PS) D
20R +×(2,7 PS)

NOTE R is measured on a specimen taken from the area where the burst is expected to occur. This position is

established by burst testing a minimum of three extinguisher bodies. The specimen to be measured is taken from an

unburst extinguisher body.
6.2.2 Extinguisher Bodies – Requirements for the base
The portable extinguisher shall be constructed so that it may be:
— free standing on a horizontal surface;
and / or
— fixed to a vertical surface.
The shape of the base of the extinguisher body is optional.

Bodies for extinguishers that may be free-standing shall either be fitted with a means to raise the pressure

retaining part of the body (base) by at least 5 mm above the horizontal surface or the thickness of metal in the

base of the body in contact with the horizontal surface shall be at least the minimum wall thickness

S + 0,5 mm as calculated in 6.2.1.
6.3 Bodies – Required for use with plastic components
The threads shall be of the form as specified in D.2.6.
7 Prototype Testing
7.1 General
The design verification shall be by prototype testing.

All the bodies and fittings used for the tests shall bear all normal markings indicated in Clause 9 and shall be

in their finished state (e.g. painted).
7.2 Burst Test – low temperature
7.2.1 General
The burst test shall be carried out to confirm the adequate strength.
7.2.2 Extinguisher Bodies
7.2.2.1 Conditions
A minimum of three specimens shall be used.

Tests shall be carried out at TS (- 4, +0) °C after being conditioned for a minimum of 12 h at this

min
temperature.

A burst of the extinguisher body, under hydraulic pressure, shall be carried out usin

...

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