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

This European Standard specifies the rules of design, type testing, fabrication and inspection control of portable fire extinguishers manufactured with metallic bodies as far as pressure risk is concerned.
This part 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) and gives guidance for sound engineering practice for metallic gas cartridges equal to or greater than 0,12 l and less than 0,5 l, see Annex F.
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: 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

Diese Europäische Norm legt Regeln zur Bemessung, Typprüfung, Herstellung und Inspektionskontrolle
tragbarer Feuerlöscher mit Metallgehäusen fest, soweit die Gefährdung durch Druck betrachtet wird.
Der vorliegende Teil gilt für tragbare Feuerlöscher, bei denen der zulässige Höchstdruck PS kleiner als oder
gleich 30 bar ist, und die nicht explosive, nicht entzündbare, nicht toxische und nicht oxydierende Flüssigkeiten
enthalten.
Diese Europäische Norm gilt auch für Gasbehälter aus Metall mit einem Volumen kleiner 0,12 l, siehe
Anhang E und sie enthält eine Anleitung zur Herstellung von Gasbehältern aus Metall gleich oder größer
0,12 l und kleiner als 0,5 l entsprechend guter Ingenieurspraxis, siehe Anhang F.
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 additionnelles à l'EN 3-7 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

La présente Norme européenne définit les règles de conception, d'essai de type, de fabrication et d’inspection des
extincteurs d’incendie portatifs dont le corps est en métal, en ce qui concerne les risques liés à la pression.
La présente partie s'applique aux extincteurs d’incendie portatifs dont la pression maximale admissible PS est
inférieure ou égale à 30 bar et renfermant des fluides inexplosibles, ininflammables, non toxiques et non oxydants.
La présente Norme européenne s'applique également aux cartouches de gaz métalliques dont le volume est
inférieur à 0,12 l, voir l’Annexe E, et donne des lignes directrices relatives aux règles de l’art applicables aux
cartouches de gaz métalliques de volume supérieur ou égal à 0,12 l et inférieur à 0,5 l, voir l’Annexe F.
La présente Norme européenne ne s'applique pas aux extincteurs à dioxyde de carbone.
NOTE 1 L'Annexe A donne la classification des différentes parties constitutives d'un extincteur d’incendie portatif.

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

General Information

Status
Withdrawn
Publication Date
05-Dec-2006
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
18-Aug-2021

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Portable fire extinguishers - Part 8: Additional requirements to EN 3-7 for the construction, resistance to pressure and mechanical tests for extinguishers with a maximum allowable pressure equal to or lower than 30 barExtincteurs d'incendie portatifs - Partie 8: Exigences additionnelles a l'EN 3-7 pour la construction, la résistance a la pression et les essais mécaniques pour extincteurs dont la pression maximale admissible est inférieure ou égale a 30 barTragbare 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 barTa slovenski standard je istoveten z:EN 3-8:2006SIST EN 3-8:2007en13.220.10Gašenje požaraFire-fightingICS:SLOVENSKI

STANDARDSIST EN 3-8:200701-marec-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3-8December 2006ICS 13.220.10 English VersionPortable fire extinguishers - Part 8: Additional requirements toEN 3-7 for the construction, resistance to pressure andmechanical tests for extinguishers with a maximum allowablepressure equal to or lower than 30 barExtincteurs d'incendie portatifs - Partie 8: Exigencesadditionnelles à l'EN 3-7 pour la construction, la résistanceà la pression et les essais mécaniques pour extincteursdont la pression maximale admissible est inférieure ouégale à 30 barTragbare Feuerlöscher - Teil 8: Zusätzliche Anforderungenzu EN 3-7 an die konstruktive Ausführung, Druckfestigkeit,mechanische Prüfungen für tragbare Feuerlöscher miteinem maximal zulässigen Druck kleiner gleich 30 barThis European Standard was approved by CEN on 2 November 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3-8:2006: E

EN 3-8:2006 (E) 2 Contents Page Foreword......................................................................................................................................................................4 1 Scope..............................................................................................................................................................5 2 Normative references....................................................................................................................................5 3 Terms and definitions...................................................................................................................................6 4 Symbols and abbreviations..........................................................................................................................6 5 Materials.........................................................................................................................................................7 5.1 Materials for bodies.......................................................................................................................................7 5.2 Materials for the bodies of operating devices and filling caps.................................................................7 5.3 Materials for other components...................................................................................................................7 6 Experimental design method and prototype testing..................................................................................7 6.1 General............................................................................................................................................................7 6.2 Experimental design......................................................................................................................................8 6.3 Prototype testing...........................................................................................................................................9 6.4 Overfill pressure test (for water based media cartridge operated extinguishers only).......................13 6.5 Resistance to impact...................................................................................................................................13 7 Manufacturing..............................................................................................................................................13 7.1 General requirements..................................................................................................................................13 7.2 Welded and brazed parts............................................................................................................................13 7.3 Traceability...................................................................................................................................................14 8 Inspection and testing during production................................................................................................14 8.1 Final examination.........................................................................................................................................14 8.2 Burst test......................................................................................................................................................15 9 Marking.........................................................................................................................................................16 9.1 General..........................................................................................................................................................16 9.2 Body..............................................................................................................................................................16 9.3 Extinguisher.................................................................................................................................................16 Annex A (informative)

Classification of the different parts of an extinguisher subject to internal pressure........................................................................................................................................................17 Annex B (normative)

Pressures...............................................................................................................................18 Annex C (normative)

Impact test.............................................................................................................................19 C.1 Resistance to impact by falling weight).....................................................................................................19 Annex D (normative)

Specification for plastics components

(except hoses, pistols 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 Annex F (informative)

Propellant gas cartridges volume equal to or greater than 0,12 l but less than 0,5 l......................................................................................................................................................................26 F.1 Construction.................................................................................................................................................26 F.2 Pressure test................................................................................................................................................26 F.3 Marking.........................................................................................................................................................26

EN 3-8:2006 (E) 3 Annex G (normative)

Overfill pressure test............................................................................................................28 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC.............................................................................................................................29

Figure 1 — Crushing test for long bodies..............................................................................................................10 Figure 2 — Crushing test for short bodies............................................................................................................11 Table 1 — Number of bodies to be sampled..........................................................................................................15 Table 2 — Batch sampling plan following failure..................................................................................................16 Table A.1 — Classification.......................................................................................................................................17 Figure B.1 — Scheme of pressure..........................................................................................................................18 Table D.1 — Drop height for hammer test..............................................................................................................22 Figure D.1 — Example of thread profile.................................................................................................................23 Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC..............................29

EN 3-8:2006 (E) 4 Foreword This document (EN 3-8:2006) has been prepared by Technical Committee CEN/TC 70 "Manual means of fire fighting equipment", the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2007, and conflicting national standards shall be withdrawn at the latest by June 2007. 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 97/23/EC. 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 (EN 1866) EN 3 consists of the following parts, under the general title "Portable fire extinguishers"  Part 11): Description, duration of operation, class A and B fire test  Part 21): Tightness, dielectric test, tamping test, special provisions  Part 3: Construction, resistance to pressure, mechanical tests  Part 41): Charges, minimum required fire  Part 51): Specification and supplementary tests  Part 6: Provisions for the attestation of conformity of portable fire extinguishers in accordance with EN 3 part 1 to part 5  Part 7: Characteristics, performance requirements and test methods  Part 82): Additional requirements to EN 3-7 for the construction, resistance to pressure and mechanical tests for extinguishers with a maximum allowable pressure equal to or lower than 30 bar  Part 92): Additional requirements to EN 3-7 for pressure resistance of CO2 extinguishers  Part 103): Provisions for evaluating the

conformity of a portable fire extinguisher to EN 3 part 7 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

1) Withdrawn and replaced by EN 3-7. 2) EN 3-8 and 3-9 update and amend EN 3-3. On publication of these EN 3-3 will be withdrawn. 3) In preparation. EN 3-10 updates and amends EN 3-6. On publication of EN 3-10 EN 3-6 will be withdrawn.

EN 3-8:2006 (E) 5 1 Scope This European Standard specifies the rules of design, type testing, fabrication and inspection control of portable fire extinguishers manufactured with metallic bodies as far as pressure risk is concerned. This part 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) and gives guidance for sound engineering practice for metallic gas cartridges equal to or greater than 0,12 l and less than 0,5 l, see Annex F. 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 referenced documents are indispensable for the application 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, Portable fire extinguishers — Part 7: Characteristics, performance requirements and test methods EN 287-1:2004, 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 EN 10204:20044), Metallic products — Types of inspection documents EN 13133:2000, Brazing — Brazer approval EN 13134:2000, Brazing — Procedure approval EN ISO 4892-2:1999, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps (ISO 4892-2:2006) 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)

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

EN 3-8:2006 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 3-7:2004 and the following apply. NOTE A scheme illustrating the different pressures is given in Annex B. 3.1 maximum pressure at maximum operating temperature, P (Tmax) (pressure experimentally measured) pressure measured in the extinguisher after stabilisation during at least 24 h at maximum operating temperature (Tmax) and for cartridge operated extinguishers, the maximum pressure is the maximum 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, PS (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 (Tmax) NOTE 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 Pr 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 Tmax maximum operating temperature declared by the manufacturer equal to or less than TSmax 3.6 minimum operating temperature Tmin minimum operating temperature declared by the manufacturer equal to or higher than TSmin 3.7 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 In the ADR these are classified as cylinders (definition 1.2). 3.8 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 PT Test pressure in bar

EN 3-8:2006 (E) 7 Pr Bursting pressure in bar D Nominal external diameter of the body, or the largest external value of the perpendicular section to the axis, in mm DN Diameter in mm for circular products submitted to pressure or the diameter in mm of the equivalent flow section for non circular parts DB Diameter of the mandrel used during the crushing test in mm P (Tmax) Pressure at maximum operating temperature, in bar Tmax Maximum operating temperature declared by the manufacturer, in ºC Tmin Minimum operating temperature declared by the manufacturer, in ºC S Minimum wall thickness in mm TSmin Minimum allowable temperature in ºC TSmax Maximum allowable temperature in ºC 5 Materials 5.1 Materials for bodies An inspection certificate based on specific inspection in accordance with EN 10204 is required. 5.2 Materials for the bodies of operating devices and filling caps The body material (metallic or plastics) of any operating device and filling cap shall be compatible with other products and shall have an appropriate certificate such as EN 10204:2004 test report 2.2. 5.3 Materials for other components The materials used for other parts of extinguishers shall be suitable for the intended use and be compatible with the materials used for the pressure parts. In the case of plastic materials, components shall comply with the requirements of Annex D. 6 Experimental design method and prototype testing 6.1 General The minimum allowable temperature range declared of the body TSmin to TSmax shall be – 30 ºC to + 60 ºC.

A wider temperature range may be declared by the manufacturer.

Where this is the case, the temperatures and pressures used in this European Standard shall be amended to reflect this new temperature range.

EN 3-8:2006 (E) 8 6.2 Experimental design 6.2.1 Bodies – Minimum wall thickness 6.2.1.1 General In no case shall the value of the wall thickness be below that given by the equations below. 6.2.1.2 Metallic bodies except austenitic steel bodies The body shall have a measured wall thickness greater than the minimum wall thickness calculated using the following equation: KDS+=300 where K is a coefficient with a value of: 0,45 for D ≤ 80 mm; 0,50 for D > 80 mm and ≤ 100 mm; 0,70 for D > 100 mm. 6.2.1.3 Austenitic steel bodies For austenitic steel bodies, the wall thickness measured shall be greater than the minimum wall thickness calculated using the following equation: 30600,+=DS This is subject to an absolute minimum thickness of 0,64 mm, including all tolerances. 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. 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 at least 5 mm above the horizontal surface or the thickness of metal in the pressure retaining part of the body in contact with the horizontal surface shall be at least 1,5 times the minimum wall thickness(es) (see 6.2.1). All parts less than 5 mm from the horizontal surface which are under pressure, shall be at 1,5 times the minimum wall thickness(es) (see 6.2.1). 6.2.3 Bodies – Requirements for use with plastics components The threads shall be of the form as specified in D.2.6.

EN 3-8:2006 (E) 9 6.3 Prototype testing 6.3.1 General Tests shall be carried out at (20 ± 5) °C) in accordance with 6.3.2 and 6.3.3. The number of specimens tested shall be at least:  for 6.3.2:

5 specimens;  for 6.3.3:

5 specimens. The tests described in 6.3.2 and 6.3.3 shall be carried out on a minimum of 10 bodies and fittings. 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). Fittings include operating devices, filling caps and hose assemblies. The fittings need not be tested as part of the complete extinguisher but the test equipment connection and blanking features shall replicate the adjacent components. 6.3.2 Burst test under pressure 6.3.2.1 Test conditions The burst test 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. 6.3.2.2 Requirements – Bodies The bursting pressure Pr shall not be less than 2,7 times the maximum allowable pressure PS subject to a minimum of 55 bar. The burst test shall not cause the 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 diametral plane and shall have a reduction in area over their entire thickness. The break shall not show any obvious defects in the material. The break shall not originate in the body marking area or weld. 6.3.2.3 Requirements – Fittings The bursting pressure Pr shall not be less than 2,7 times the maximum allowable pressure PS. The burst test shall not cause the fitting to fragment. The break shall not show any obvious defects in the material. The break shall not originate in the marking area.

EN 3-8:2006 (E) 10 6.3.3 Mechanical strength test (crushing test) 6.3.3.1 General The mechanical strength test shall be carried out in the form of a crushing test used to confirm the ductility of the body. In carrying out the test the mandrel shall be positioned as stated, but such as to minimise the risk of damage to connection points which allow pressurisation of the body. Damage to these points does not constitute failure and alternative means of pressurising the body may be established. A closure shall be fitted prior to the test. Any connection shall not add to the strength of the body during the test. The length of the body is the maximum distance between the ends of the pressure envelope, excluding any skirt or connection. 6.3.3.2 Long bodies The method following shall be used when the length of the body is greater than 1,5 D. The body shall be crushed perpendicularly to its longitudinal axis and approximately in the middle of the body by means of a non-deformable cylindrical mandrel of diameter DB = (D ± 20) mm and of a length sufficient for each end to overlap the crushed body (see Figure 1).

Key D nominal external diameter of the body DB diameter of the mandrel Figure 1 — Crushing test for long bodies

The body shall be crushed to (10 ± 1) % of its external diameter. The duration of the movement of the mandrel shall be within a period of 30 s to 60 s. For bodies with a longitudinal weld, the weld seam shall be at 90° to the support line. For bodies with a transverse weld, the crushing shall be carried out at an angle of 45° to the weld. Following the crushing test, the body shall be subjected to the test pressure PT. The body shall not have any cracks or leaks.

EN 3-8:2006 (E) 11 6.3.3.3 Short bodies The following method shall be used when the body length is equal to or less than 1,5 D. The body is crushed perpendicularly to its longitudinal axis and its mid-point using two 25 mm thick mandrels. The mandrels shall be radiused for a half cylinder R = 12,5 mm and be of sufficient length to extend beyond the sides of the crushed body. Crushing shall be made to the dimensions shown in Figure 2. The duration of the movement of the mandrel shall be within a period of 30 s to 60 s. For bodies having a longitudinal weld, the weld seam shall be at 90° to the mandrels. For bodies having a transverse weld or welds within the zone of deformation, the mandrels shall be at an angle least likely to result in test failure and within 45° to 90° of the longitudinal axis of the body. Following the crushing test, the body shall be subjected to the test pressure PT. The body shall not have any cracks or leaks. Dimensions in millimetres

Key R (12,5 ± 1) mm D/3 ± 1 % D = distance between mandrels at completion of crushing D actual outside diameter of cylinder Figure 2 — Crushing test for short bodies 6.3.4 Pressure test (test pressure PT) – Bodies, fittings and assemblies 6.3.4.1 Test conditions Bodies, fittings and assemblies 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 up to the moment the test pressure is reached. Five samples of bodies and fittings and one assembly shall be tested.

EN 3-8:2006 (E) 12 6.3.4.2 Requirements – Bodies The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS with a minimum of 20 bar. 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 increase by more than 1 %. 6.3.4.3 Requirements – Fittings The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS with a minimum of 20 bar. The test pressure shall be maintained for a minimum of 30 s and the fittings shall remain tight and show no dangerous defect. 6.3.4.4 Requirements – Assembly The test pressure PT shall not be less than 1,43 times the maximum allowable pressure PS with a minimum of

20 bar. The test pressure shall be maintained for a minimum of 30 s and the assembly shall remain tight and show no dangerous defect. 6.3.5 Pressure test – Pressure gauges and pressure indicators 6.3.5.1 Test conditions Five 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 2,5 times P (Tmax) is reached. Maintain this pressure for 30 s. 6.3.5.2 Requirements When tested at a temperature of (20 ± 5) °C, the sample shall not leak at a pressure less than 2,5 times P (Tmax). Failure shall occur at a pressure greater than 2,5 times P (Tmax) and when the gauge fails there shall be no ejection of any components. NOTE This test should be considered to be a destructive test. 6.3.6 Macroscopic examination of the body On five bodies each weld subject to pressure shall be examined, 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. 6.3.7 Plastics components Plastics components shall comply with the requirements of Annex D.

EN 3-8:2006 (E) 13 6.4 Overfill pressure test (for water based media cartridge operated extinguishers only) To make sure the extinguishers will remain safe even in case of overfilling, the extinguishers shall be tested in accordance with Annex G and shall not eject any components in a dangerous manner.

This test shall be performed on two samples. 6.5 Resistance to impact 6.5.1 Test conditions TSmax and TSmin claimed by the manufacturer shall be used for the tests in 6.5.2 and Annex C. 6.5.2 Requirements When tested in accordance with Annex C, extinguishers shall not show evidence of bursting, breakage or ejection of components. Non-dangerous leaks are acceptable. 7 Manufacturing 7.1 General requirements

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