oSIST prEN 3-8:2015

SLOVENSKI STANDARD
01-september-2015
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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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

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
r
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

prEN 3-8:2015 (E)
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.
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
1)
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)

1)
This standard is also applicable to non-metallic products (see EN 10204:2004, 1.2).
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)
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
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
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
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
2)
PT
Test pressure = 1,43 x PS in bar
P Bursting pressure (measured) - in bar
r
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
B
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, in mm
TS Minimum allowable temperature, in °C
min
TS Maximum allowable temperature, in °C
max
R 2)
mf
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;

2)
Guaranteed by the manufacturer after all manufacturing processes have been carried out on the final product.
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:
prEN 3-8:2015 (E)
(2,7××PS) D
S=
20R +×(2,7 PS)
mf
NOTE R is measured on a specimen taken from the area where the burst is expected to occur. This position is
mf
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 using an installation which
permits a regular increase of pressure at not more than 2 bar/s until burst occurs and also permits the
variation of pressure to be recorded as a function of time.
prEN 3-8:2015 (E)
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 extinguisher 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 and shall occur in the cylindrical (parallel) portion of the extinguisher body;
4) the break shall not show any obvious defects in the material;
5) 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.
Should the fracture cross the weld from its point of origin it shall not be considered a failure.
6) the burst pressure tests 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 (except pressure indicating devices – as defined in EN 3-7)
7.2.3.1 Conditions
A minimum of three specimens shall be used.
Tests shall be carried out at TS (+0, −4) °C after being conditioned for a minimum of 12 h at this
min
temperature.
A burst of the fitting, 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
1) The bursting pressure P shall not be less than 2,7 times the maximum allowable pressure PS;
r
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.
7.2.4 Pressure test – Pressure gauges and pressure indicators
7.2.4.1 Test conditions
Three samples shall be submitted to the pressure test which shall be carried out using apparatus that permits
a regular increase of pressure at a maximum of 2 bar/s until 2,7 times P (T ) is reached. Maintain this
max
pressure for 30 s.
The samples shall be tested at a temperature of (20 ± 5) °C.
prEN 3-8:2015 (E)
7.2.4.2 Requirements
The samples:
1) shall not leak at a pressure less than PT;
2) shall not fail at a pressure less than 2,7 times P (T ) and when failure occurs there shall be no ejection
max
of any components.
This test should be considered to be a destructive test.
7.3 Crushing Test – low temperature (extinguishe
...