oSIST prEN 3-8:2014

SLOVENSKI STANDARD
oSIST prEN 3-8:2014
01-februar-2014
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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
Höchstdruck 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 pour les extincteurs conformes à 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
ICS:
13.220.10 Gašenje požara Fire-fighting
oSIST prEN 3-8:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 3-8:2014

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oSIST prEN 3-8:2014

EUROPEAN STANDARD
DRAFT
prEN 3-8
NORME EUROPÉENNE

EUROPÄISCHE NORM

December 2013
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 la Tragbare Feuerlöscher - Teil 8: Anforderungen an die
construction, la résistance à la pression et les essais konstruktive Ausführung, Druckfestigkeit und mechanischen
mécaniques pour les extincteurs conformes à l'EN 3-7 dont Prüfungen für tragbare Feuerlöscher mit einem
la pression maximale admissible est inférieure ou égale à Höchstdruck kleiner gleich 30 bar, welche die
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
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3-8:2013 E
worldwide for CEN national Members.

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Contents
Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Symbols and abbreviations .7
5 Materials .7
6 Design method – Bodies .8
6.1 General .8
6.2 Calculation .8
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
7.3 Crushing Test – low temperature (bodies only) . 10
7.4 Pressure test (test pressure PT) – bodies, fittings and assemblies . 11
7.5 Macroscopic examination of the body . 11
7.6 Overfill pressure test (for water based media cartridge operated extinguishers only) . 11
7.7 Plastics components (subject to pressure) except hoses, and nozzles. 12
7.8 Resistance to impact . 12
8 Manufacturing, Inspection and testing during production. 12
8.1 Requirements . 12
8.2 Pressure Testing . 13
8.3 Burst & Crushing test . 14
8.4 Final inspection . 15
9 Marking . 16
9.1 General . 16
9.2 Body . 16
9.3 Extinguisher . 16
10 Propellant Gas Cartridges . 16
Annex A (informative) Classification of the different parts of an extinguisher subject to internal

pressure . 17
Annex B (normative) Pressures and temperatures . 18
Annex C (normative) Impact test — Resistance to impact by falling weight . 19
C.1 General . 19
C.2 Apparatus . 19
C.3 Procedure . 19
Annex D (normative) Specification for plastics components (except hoses and nozzles) . 20
D.1 General . 20
D.2 Requirements for plastics components subject to pressure . 20
Annex E (normative) Propellant gas cartridges volume less than 0,12 l . 24
E.1 Refillable cartridge. 24
E.2 Non-refillable cartridges . 25
E.3 Marking . 25
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Annex F (normative) Overfill pressure test . 26
Annex G (normative) Mechanical strength test (crushing test) . 27
G.1 General . 27
G.2 Long bodies . 27
G.3 Short bodies . 28
Annex H (normative) Materials – Quality control documents . 29
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC . 30

Table 1 . 13
Table 2 — Number of bodies to be sampled . 14
Table 3 — Batch sampling plan following failure. 14
Table 4 — Batch sampling plan following failure. 15
Table A.1 — Classification . 17
Table D.1 — Schedule of Testing for Pressure bearing Components . 20
Table D.2 — Drop height for hammer test . 22
Table H.1 . 29
Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC . 30


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Foreword
This document (prEN 3-8:2013) 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
2
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.
List of major changes:
The following sections have been revised:
 scope;
 materials;
 permanent joining;
 relationship with the ESR’s;
 relationship and titles to EN 3 series.
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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 metallic gas cartridge of a volume less than 0,12 l (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 287-1:2011, Qualification test of welders — Fusion welding — Part 1: Steels
EN 1320:1996, Destructive tests on welds in metallic materials — Fracture test
EN 1418:1997, Welding personnel — Approval testing of welding operators for fusion welding and resistance
weld setters for fully mechanized and automatic welding of metallic materials
1)
EN 10204:2004 , Metallic products — Types of inspection documents
EN ISO 4892-2:2006, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
(ISO 4892-2:2009)
EN ISO 9606-2:2004, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium
alloys (ISO 9606-2:2004)
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 15614-12:2004, Specification and qualification of welding procedures for metallic materials —
Welding procedure test — Part 12: Spot, seam and projection welding (ISO 15614-12:2004)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 3-7:2004+A2007 and the following
apply.
NOTE Schemes illustrating the different pressures and temperatures is given in Annex B.

1) This standard is also applicable to non-metallic products (see EN 10204:2004, 1.2).
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3.1
maximum 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
PS
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
P
r
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 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
T
max
maximum operating temperature declared by the manufacturer equal to or less than TS
max
3.6
minimum operating temperature
T
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 with a capacity less
than 0,5 l
Note 1 to entry: In the ADR these are classified as cylinders (definition 1.2).
3.9
fittings
pressure accessories which include operating devices, filling caps and hose assemblies
5
Note 1 to entry: 1 bar = 10 Pa = 0,1 MPa.
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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) - in bar
r
D Nominal external diameter of the 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
B
P (T ) Pressure at maximum operating temperature, in bar
max
T Maximum operating temperature declared by the manufacturer, in ºC
max
T Minimum operating temperature declared by the manufacturer, in ºC
min
S Minimum wall thickness, in mm
TS Minimum allowable temperature, in ºC
min
TS Maximum allowable temperature, in ºC
max
2
R Ultimate tensile strength*, in MPa (N/mm )
m
*(as denoted on the material certificate received from the raw material supplier)
2
R Ultimate tensile strength*, in MPa (N/mm )
mf
*(guaranteed by the manufacturer after all manufacturing processes have been carried out on
the final product)
5 Materials
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 Clause 14.1 Resistance to external corrosion and additionally for water based media EN 3-7+A1
Clause 14.2 Resistance to extinguishing medium of extinguishers using water based media.
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;
 the relevant required material properties after processing.
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The materials used for non-pressure bearing parts and accessories of extinguishers shall be compatible with
the materials used for the pressure bearing parts.
Plastic components shall fulfil the clauses of Annex D except hoses and nozzles.
For the materials, used in the type testing and type approval, inspection documents in accordance with
Annex H shall be provided.
Particular attention shall be given to incompatibilities produced for example by:
 galvanic corrosion;
 stress corrosion;
 electrolytic corrosion.
6 Design method – Bodies
NOTE For requirements for Gas Cartridges see Annex E.
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 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.
6.2 Calculation
6.2.1 Bodies – Requirements for the body
The body shall have a measured wall thickness which is equal to or greater than the wall thickness calculated
using the following formula:
(2,7× PS)× D
S=
20R + (2,7× PS)
mf
6.2.2 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.
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The shape of the base of the 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
NOTE For requirements for Gas Cartridges see Annex E.
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 of the body.
7.2.2 Bodies
7.2.2.1 Conditions
A minimum of three specimens shall be used.
Tests shall be carried out at TS (+0, - 2) °C.
min
A burst of the body, under hydraulic pressure, shall be carried out using an installation which permits a regular
increase of pressure at not more than 2 bar/s until the body bursts and also permits the variation of pressure
to be recorded as a function of time.
7.2.2.2 Requirements
1) In all tests P shall be greater than 2,7 x PS;
r
2) the burst test shall not cause the body to fragment;
3) 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;
4) the break shall not show any obvious defects in the material;
5) the break shall not originate in the body marking area or weld;
NOTE 1 The heat affected zone is not considered to be in or part of the weld.
NOTE 2 Should the fracture cross the weld from its point of origin it shall not be considered a failure.
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6) the burst pressure test are carried out at the specified pressures, in the event that a sealing “O” ring or
washer moves out of its housing before burst pressure is reached, this shall not be caused by
deformation of the valve or the neck ring, then a fitting shall be devised to enable the burst test to be
completed.
7.2.3 Fittings
7.2.3.1 Conditions
A minimum of three specimens shall be used.
Tests shall be carried out at TS (+0, -4) °C.
min
A burst of the body, under hydraulic pressure, shall be carried out using an installation which permits a regular
increase of pressure at not more than 2 bar/s until the fitting bursts and also permits the variation of pressure
to be recorded as a function of time.
7.2.3.2 Requirements
The bursting pressure P shall:
r
1) not be less than 2,7 times the maximum allowable pressure P ;
s
2) the burst test shall not cause the fitting to fragment;
3) the break shall not show any obvious defects in the material;
4) the break shall not originate in the marking area.
7.3 Crushing Test – low temperature (bodies only)
7.3.1 General
The mechanical strength test shall be carried out in the form of a crushing test used to confirm the ductility of
the body.
7.3.2 Conditions
A minimum of three specimens shall be used.
Tests shall be carried out at TS (+0, -4) °C in accordance with Annex G.
min
All the bodies used for the tests shall bear all normal markings indicated in Clause 9 and shall be in their
finished state (e.g. painted).
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7.3.3 Requirements
Following the crushing test, the body shall be subjected to the test pressure PT for 30 s During the pressure
test the body shall not have any cracks or leaks.
7.4 Pressure test (test pressure PT) – bodies, fittings and assemblies
7.4.1 Test conditions
Bodies, fittings and assemblies shall be submitted to the pressure test (at 20 ± 3 °C ) which shall be carried
out using apparatus that permits a regular increase of pressure at a maximum of 2 bar/s up to the moment the
test pressure is reached.
Five samples of bodies and fittings and one assembly (see clause 3.4) shall be tested.
7.4.2 Requirements – Bodies
The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS.
The test pressure shall be maintained for a minimum of 30 s and the body shall remain tight.
After the test, the volume of the body shall not have any permanent increase of more than 1 %.
7.4.3 Requirements – Fittings
The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS.
The test pressure shall be maintained for a minimum of 30s and the fittings shall remain tight and show no
defects. e.g. cracks, splits or ejection of parts
7.4.4 Requirements – Assembly
The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS The test pressure
shall be maintained for a minimum of 30 s and the assembly shall remain tight and show no defects. e.g.
cracks, splits or ejection of parts.
7.5 Macroscopic examination of the body
7.5.1 Conditions
On five bodies each weld subject to pressure shall be examined.
7.5.2 Requirements
The macroscopic examination of a transverse section of the weld, in accordance with EN 1320, shall show
complete fusion over the area treated with a preparation acid and any defects shall be revealed.
If there is any doubt, a microscopic examination of the suspect area shall be carried out.
7.6 Overfill pressure test (for water based media cartridge operated extinguishers only)
7.6.1 General
To ensure the extinguishers will remain safe even in case of overfilling, the extinguishers shall be tested in
accordance with Annex F.
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7.6.2 Conditions
The extinguisher shall be conditioned at T (-0, +4°C) for 24 h.
max
Two assemblies shall be tested.
7.6.3 Requirements
No component shall be ejected.
7.7 Plastics components (subject to pressure) except hoses, and nozzles
Plastics components shall comply with the requirements of Annex D.
7.8 Resistance to impact
7.8.1 Conditions
TS (-0, +4°C) and TS (+0, -4°C) claimed by the manufacturer shal
...