SIST EN 3-7:2004
(Main)Portable fire extinguishers - Part 7: Characteristics, performance requirements and test methods
Portable fire extinguishers - Part 7: Characteristics, performance requirements and test methods
This standard specifies characteristics, performance requirements and test methods for portable fire extinguishers. Extinguishers for use on calls D fires (fires involving flammable metals) are outside the scope of this standard. Note: the extinction of a metal fire presents a situation so specific (in terms of the metal itself, its form, the configuration of the fire, etc) that it is not possible to define a representative standard fire for the purpose of testing. The efficiency of extinguishers on class D fires need to be established on a case by case basis.
Tragbare Feuerlöscher - Teil 7: Eigenschaften, Löschleistung, Anforderungen und Prüfungen
Die vorliegende Norm legt die Eigenschaften, Leistungsanforderungen und Prüfverfahren für tragbare Feuerlöscher fest.
) In Vorbereitung. EN 3-8 und EN 3-9 aktualisieren und ändern EN 3-3. Bei Veröffentlichung von EN 3-8 und EN 3-9 wird EN 3-3 zurückgezogen.
) EN 3-10 aktualisiert und ändert EN 3-6. Bei Veröffentlichung von EN 3-10 wird EN 3-6 zurückgezogen.
Eine Angabe zur Eignung eines Feuerlöschers für den Einsatz bei Gasbränden (Brandklasse C) liegt im Ermessen des Herstellers und gilt nur für Pulver-Feuerlöscher. Dieses gilt nur, wenn sie die Mindestanforderungen an das Löschvermögen für die Brand-klasse B oder Brandklasse A und B erreichen.
Die Eignung von Feuerlöschern für die Brandklasse D (Brände von Metallen) liegt nur im Hinblick auf die Prüfobjekte außerhalb des Anwendungsbereiches dieser Norm. Alle anderen Anforderungen dieser Norm an Pulver-Feuerlöscher gelten auch für Feuerlöscher, die die Eignung für die Brandklasse D beanspruchen.
ANMERKUNG Das Ablöschen eines Metallbrandes stellt eine derartige Besonderheit dar (in Bezug auf das Metall selbst, seine Form, die Brandentwicklung usw.), dass es nicht möglich ist, ein repräsentatives Prüfobjekt festzulegen. Das Löschver-mögen für ein Prüfobjekt der Brandklasse D muss Gegenstand von besonderen Falluntersuchungen sein.
Extincteurs d'incendie portatifs - Partie 7: Caractéristiques, performances et méthodes d'essai
La présente norme spécifie les caractéristiques, les exigences de performance et les méthodes d'essai relatives aux extincteurs d'incendie portatifs.
La mention de l'utilisation possible d'un extincteur pour des foyers gazeux (feux de classe C) est laissée a la discrétion du fabricant, mais n'est possible que pour des extincteurs a poudre qui ont obtenu des foyers-types sur feux de classe B ou sur feux de classe A et de classe B.
L'aptitude des extincteurs a etre utilisés sur les feux de classe D (feux impliquant des métaux inflammables) ne fait pas partie du domaine d'application de cette norme en ce qui concerne les essais sur feu. En revanche, les extincteurs déclarés utilisables sur les feux de classe D sont couverts pour tous les autres aspects par les exigences de la présente norme pour les extincteurs a poudre.
NOTE L'extinction d'un feu de métaux présente une situation spécifique (en termes du métal lui-meme, de sa forme, de la configuration du feu, etc.) au point qu'il n'est pas possible de définir un feu type représentatif pour les besoins de l'essai. L'efficacité des extincteurs sur les feux de la classe D doit etre évaluée au cas par cas.
Prenosni gasilniki – 7. del: Lastnosti, zahteve za obnašanje v uporabi in preskusne metode
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Portable fire extinguishers - Part 7: Characteristics, performance requirements and test methodsPrenosni gasilniki – 7. del: Lastnosti, zahteve za obnašanje v uporabi in preskusne metodeExtincteurs d'incendie portatifs - Partie 7: Caractéristiques, performances et méthodes d'essaiTragbare Feuerlöscher - Teil 7: Eigenschaften, Löschleistung, Anforderungen und PrüfungenTa slovenski standard je istoveten z:EN 3-7:2004SIST EN 3-7:2004en13.220.10ICS:SIST EN 3-5:1997SIST EN 3-5:1997/AC:1997SIST EN 3-4:1997SIST EN 3-1:1996SIST EN 3-2:19971DGRPHãþDSLOVENSKI
STANDARDSIST EN 3-7:200401-april-2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3-7January 2004ICS 13.220.10English versionPortable fire extinguishers - Part 7: Characteristics, performancerequirements and test methodsExtincteurs d'incendie portatifs - Partie 7: Caractéristiques,performances et méthodes d'essaiTragbare Feuerlöscher - Teil 7: Eigenschaften,Löschleistung, Anforderungen und PrüfungenThis European Standard was approved by CEN on 5 March 2003.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, 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© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3-7:2004: E
EN 3-7:2004 (E)2ContentsForeword.41Scope.52Normative references.53Terms and definitions.54General.74.1Description of a portable fire extinguisher.74.2Control of discharge.84.3Operating position.84.4Hose assembly.84.5Propellants.84.6Stored pressure extinguishers.85Testing of portable fire extinguishers.86Nominal charges, filling tolerances and minimum fire performance.96.1Nominal charges.96.2Filling tolerances.96.3Design of the filling opening.96.4Minimum fire ratings.97Duration of operation, residual charge and operating temperatures.127.1Duration of operation.127.2Residual charge.137.3Commencement of discharge.137.4Effective range of operating temperature.138Retention of propellant.148.1Verification.148.2Acceptance levels.148.3Production leak tests.149Dielectric test for water based extinguishers.159.1General.159.2Required performance.1510Requirements for components.1510.1General.1510.2Operation and emission control mechanisms/devices.1510.3Safety devices.1610.4Filter for water based portable fire extinguishers.1610.5Hose and coupling systems.1610.6Control valve.1611Means of pressure indication.1711.1Pressure gauge.1711.2Pressure indicator.1812Horns for carbon dioxide portable fire extinguishers.1813Portable fire extinguisher mounting bracket.1914Resistance to corrosion.1914.1Resistance to external corrosion.1914.2Resistance to extinguishing medium of extinguishers using water based media.1915Fire performance.20
EN 3-7:2004 (E)315.1General.2015.2Class A fire rating.2015.3Class B fire rating.2016Portable fire extinguisher identification.2016.1Colour.2016.2Marking.2017Maintenance.24Annex A (normative)
Duration of operation, residual charge tests.25Annex B (normative)
Range of operating temperature.26Annex C (normative)
Dielectric test.27Annex D (normative)
Operation and emission control mechanisms/devices.29Annex E (normative)
Test for performance of the hose.30Annex F (normative)
Control valve test.31Annex G (normative)
Tests on the horn.32Annex H (normative)
Resistance to corrosion.33Annex I (normative)
Fire tests.34Annex J (normative)
Measurement of moisture content of wood.42Annex K (normative)
Compaction procedure.43Bibliography.45
EN 3-7:2004 (E)4ForewordThis document (EN 3-7:2004) has been prepared by Technical Committee CEN/TC 70 “Manual means offirefighting 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 orby endorsement, at the latest by July 2004, and conflicting national standards shall be withdrawn at the latest byJuly 2004.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.This document will supersede EN 3-1:1996, EN 3-2:1996, EN 3-4:1996 and EN 3-5:1996.EN 3 consists of the following parts, under the general title "Portable fire extinguishers":¾ Part 1: Description, duration of operation, class A and B fire test¾ Part 2: Tightness, dielectric test, tamping test, special provisions¾ Part 3: Construction, resistance to pressure, mechanical tests¾ Part 4: Charges, minimum required fire¾ Part 5: Specification and supplementary tests¾ Part 6: Provisions for the attestation of conformity of portable fire extinguishers in accordance with EN 3-1 toEN 3-5¾ Part 71): Characteristics, performance requirements and test methods¾ Part 82): Construction resistance to pressure and mechanical tests for extinguishers with a maximum allowablepressure equal or lower than 30 bar¾ Part 92): Additional requirements for CO2 extinguishers¾ Part 103): Provisions for the attestation of conformity for portable fire extinguishersAnnexes A, B, C, D, E, F, G, H, I, J, and K, are normative.This document includes a Bibliography.
1)In preparation. EN 3-7 updates and amends EN 3-1, EN 3-2, EN 3-4 and EN 3-5. On publication of EN 3-7 these will bewithdrawn.2)In preparation. EN 3-8 and 3-9 update and amend EN 3-3. On publication of these, EN 3-3 will be withdrawn.3)EN 3-10 updates and amends EN 3-6. On publication of EN 3-10, EN 3-6 will be withdrawn.
EN 3-7:2004 (E)51 ScopeThis standard specifies the characteristics, performance requirements and test methods for portable fireextinguishers.Reference to the suitability of an extinguisher for use on gaseous fires (class C fires) are at the manufacturer’sdiscretion, but are applied only to powder type extinguishers which have gained a class B or class A and class Brating.Suitability of extinguishers for use on class D fires (fires involving flammable metals) is outside the scope of thisstandard in respect of test fires. However, extinguishers claiming class D suitability are covered in all other respectsby the requirements in this standard for powder extinguishers.NOTEThe extinction of a metal fire presents a situation so specific (in terms of the metal itself, its form, the configuration ofthe fire etc.) that it is not possible to define a representative standard fire for the purposes of testing. The efficiency ofextinguishers on class D fires needs to be established on a case by case basis.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 2, Classification of fires.ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests.ISO 657-1, Hot-rolled steel sections — Part 1: Equal-leg angles — Dimensions.ISO 4470, Sawn timber — Determination of the average moisture content of a lot.Farbregister RAL-841-GL.3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1fire extinguisherappliance containing an extinguishing medium which can be expelled by the action of internal pressure and bedirected on to a fireNOTEThis pressure can be stored pressure or pressure produced by the release of an auxiliary gas from a cartridge.3.2portable fire extinguisherfire extinguisher which is designed to be carried and operated by hand and which in working order has a mass ofnot more than 20 kgNOTEThroughout this standard it is referred to as an "extinguisher"
EN 3-7:2004 (E)63.3clean agentelectrically non-conducting, volatile, or gaseous fire extinguishing medium that does not leave a residue uponevaporationNOTEExamples are fluorocarbons (FCs), perfluorocarbons (PFCs) and fluoroiodocarbons (FICs).3.4halonagent that contains as primary components one or more organic compounds containing one or more of theelements fluorine, chlorine, bromine, or iodine3.5bodyshell of the extinguisher not fitted with its accessories but fitted with all its welded/brazed parts3.6extinguishing mediumsubstance contained in the extinguisher which causes extinction of a fire3.7chargemass or volume of the extinguishing medium contained in the extinguisher, expressed as a volume (in litres) forwater based extinguishers and as a mass (in kilograms) for other extinguishers3.8water based extinguisherextinguisher containing water or water with additiveNOTEThis includes foam extinguishers.3.9powder extinguisherextinguisher containing fire extinguishing powder3.10carbon dioxide extinguisherextinguisher containing carbon dioxide3.11halon extinguisherextinguisher containing halon3.12clean agent extinguisherextinguisher containing a clean agent3.13duration of operationtime during which the extinguishing medium is discharged, without any interruption in the discharge and with thevalve fully opened not including discharge of the residual propellant gas3.14residual chargemass of medium remaining after continuous complete discharge including all propellant gas
EN 3-7:2004 (E)73.15maximum 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(which is ³ 60 °C) and for cartridge operated extinguishers, the maximum pressure is the maximum pressurerecorded for 0,5 s during a period of three minutes, excluding the first second after release of the propellant gas.3.16Tmaxmaximum operating temperature declared by the manufacturer (see 7.4.1)3.17Tminminimum operating temperature declared by the manufacturer (see 7.4.1)4 General4.1 Description of a portable fire extinguisher4.1.1A portable fire extinguisher is described by the type of extinguishing medium it contains. At present, thereare:¾ water based, including foam, extinguishers (see Note 1);¾ powder type extinguishers;¾ carbon dioxide type extinguishers;¾ halon type extinguishers (see Note 2);¾ clean agent extinguishers.NOTE 1Water based extinguishers can be produced with or without a low freeze depressant.Water based extinguishers, including foam, containing different proportions of low freeze depressant shall betreated as separate and distinct models for the purposes of testing the range of operating temperatures (see 7.4.2)and electrical conductivity (see clause 9), and fire rating tests. All other requirements relating to the design andconstruction of water based extinguishers are applicable to all models irrespective of content.NOTE 2Attention is drawn to European Council Regulation 2037/2000 concerning the use of halons.4.1.2A portable fire extinguisher consists of the following components:a) body (see 3.5);b) body fittings, which are fixed to or screwed onto the body, and include at least the following:¾ control device(s) (see 4.2, 4.3 and 10.1);¾ hose assembly (see 4.4) and/or horns and/or nozzles;¾ head assembly. This also constitutes the main closure (see 6.3);¾ operating device (see 4.3).
EN 3-7:2004 (E)8NOTEThe head assembly, operating device and control device(s) can be separate or may be incorporated in a single unit.c) media (see 4.1.1):4.2 Control of dischargePortable fire extinguishers shall be fitted with a self-closing control valve to enable the discharge to be interruptedtemporarily (see 10.6).4.3 Operating positionExtinguishers shall operate without being turned over to an inverted position. The operating device of anextinguisher shall be located on the top of the extinguisher. A control device at the end of the hose shall bepermitted. Hand wheel controls of the valve on external propellant cartridges shall be located on the top 60 % ofthe extinguisher body.4.4 Hose assemblyExtinguishers having a mass of extinguishing medium greater than 3 kg, or a volume of extinguishing mediumgreater than 3 l shall be provided with a discharge hose.The length of the flexible section of the hose assembly shall be 400 mm or greater.When an extinguisher having a mass of extinguishing medium less than or equal to 3 kg, or a volume ofextinguishing medium less than or equal to 3 l is fitted with a discharge hose, the hose assembly shall have aminimum overall length of 250 mm.4.5 PropellantsOnly propellants listed in Table 1 or mixtures thereof, shall be used. The maximum water content shall be asspecified in Table 1, except when used in stored pressure water based extinguishers. Tracers may be added to thepropellant to facilitate leakage detection, but the tracer need not be indicated in the marking.Table 1 — Permitted propellantsMaximum water contentPropellantmass fraction, %Air0,006Argon0,006Carbon dioxide0,015Helium0,006Nitrogen0,0064.6 Stored pressure extinguishersStored pressure extinguishers, except carbon dioxide, shall have a means of checking the presence of pressure,see clause 8 and clause 11.5 Testing of portable fire extinguishersExtinguishers for testing shall be stored for at least 24 h at a temperature of (20 ± 5) °C before the tests are carriedout and shall be maintained within this temperature range until tested. Tests shall be carried out within 5 min of itsremoval from storage.
EN 3-7:2004 (E)9Powder extinguishers shall be subjected to the compaction procedure given in Annex K before the storage periodpreceding the duration of operation test and the control valve test, and before the fire performance test. Waterbased extinguishers shall be subjected to the compaction procedure according to Annex K only before the storageperiod preceding the duration of operation test.6 Nominal charges, filling tolerances and minimum fire performance6.1 Nominal chargesNominal charges of portable fire extinguishers shall be equal to one of the values given in Tables 3 to 8 accordingto the nature of the extinguishing medium.6.2 Filling tolerancesThe actual charge of the extinguisher shall be equal to the nominal charge within the tolerances given in Table 2.Table 2 — Filling tolerancesExtinguishing mediumRelative tolerance%Powder1 kg± 52 kg± 3³ 3 kg± 2All other media0- 56.3 Design of the filling openingThe filling opening, except for portable carbon dioxide fire extinguishers, shall have a minimum diameter of:¾ 20 mm for extinguishers with a charge of less than or equal to 3 kg or 3 l;¾ 25 mm for extinguishers with a charge of more than 3 kg or 3 l.6.4 Minimum fire ratings6.4.1 GeneralFire classes are defined in EN 2.The minimum fire ratings are specified in Tables 3 to 8, according to the type of extinguishing medium and thecharge.Fire performance shall be tested in accordance with clause 15, and the extinguisher shall attain a class A rating, aclass B rating or both as specified in the relevant table, in accordance with the rating claimed by the manufacturer.EXAMPLEA powder extinguisher for which the manufacturer wishes to claim class A and class B ratings achieves, for thesize with a 9 kg charge, a minimum fire rating of 27A and 144B.Clean agent extinguishers shall have a minimum fire rating of 5A and/or 21B for extinguishers with charges in therange 1 kg, 2 kg, 3 kg, 4 kg, 6 kg, 9 kg and 12 kg.
EN 3-7:2004 (E)106.4.2 Ratings for class A firesFire ratings of extinguishers for class A fires are given in Tables 3 and 4.NOTEThe numbers in the first column of each table refer to the size of the test fire (see Annex I).Table 3 — Fire ratings, minimum duration of operation and nominal chargesfor powder extinguishersMinimumduration ofoperationNominal permitted chargesFire ratingskg5A618A61, 213A91, 2, 3, 421A91, 2, 3, 4, 627A91, 2, 3, 4, 6, 934A121, 2, 3, 4, 6, 943A151, 2, 3, 4, 6, 9, 1255A151, 2, 3, 4, 6, 9, 12Table 4 — Fire ratings, minimum duration of operation and nominal charges for waterbased extinguishers, including foam extinguishersMinimumduration ofoperationNominal permitted chargesFire ratingsl5A62, 38A92, 3, 613A92, 3, 6, 921A92, 3, 6, 927A122, 3, 6, 934A152, 3, 6, 943A152, 3, 6, 955A152, 3, 6, 96.4.3 Ratings for class B firesMinimum fire ratings of extinguishers for class B fires are given in Tables 5, 6, 7 and 8.NOTEThe numbers in the first column of each table refer to the size of the test fire (see Annex I).
EN 3-7:2004 (E)11Table 5 — Fire ratings, minimum duration of operation and nominal chargesfor powder extinguishersMinimumduration ofoperationNominal permitted chargesFire ratingskg21B6134B61, 255B91, 2, 370B91, 2, 3, 489B91, 2, 3, 4113B121, 2, 3, 4, 6144B151, 2, 3, 4, 6, 9183B151, 2, 3, 4, 6, 9, 12233B151, 2, 3, 4, 6, 9, 12Table 6 — Fire ratings, minimum duration of operation and nominal charges for water basedextinguishers, including foam extinguishersMinimumduration ofoperationNominal permitted chargesFire ratingsl34B6255B92, 370B92, 389B92, 3113B122, 3, 6144B152, 3, 6183B152, 3, 6, 9233B152, 3, 6, 9
EN 3-7:2004 (E)12Table 7 — Fire ratings, minimum duration of operation and nominal charges for CO2 extinguishersMinimumduration ofoperationNominal permitted chargesFire ratingskg21B6234B6255B92, 570B92, 589B92, 5113B122, 5144B152, 5183B152, 5233B152, 5Table 8 — Fire ratings, minimum duration of operation and nominal charges for halon extinguishersMinimumduration ofoperationNominal permitted chargesFire ratingskg21B6134B61, 255B91, 2, 470B91, 2, 4, 689B91, 2, 4, 6113B121, 2, 4, 6144B151, 2, 4, 6183B151, 2, 4, 6233B151, 2, 4, 67 Duration of operation, residual charge and operating temperatures7.1 Duration of operation7.1.1 Minimum durationThe duration of operation shall be greater than or equal to the appropriate value given in Tables 3 to 8 when theportable fire extinguisher is tested according to Annex A after being subjected to the compaction procedure inaccordance with Annex K (see clause 5).7.1.2 Spread of measurementsWhen three extinguishers are tested in accordance with Annex A, after being subjected to the compactionprocedure in accordance with Annex K (see clause 5), the duration of operation of each extinguisher shall be within15 % of the average value.
EN 3-7:2004 (E)137.2 Residual chargeThe residual charge (see 3.14) of extinguishing medium shall not be more than 10 % of the nominal charge whenthe extinguisher is tested in accordance with Annex A after being subjected to the compaction procedure inaccordance with Annex K (see clause 5).7.3 Commencement of dischargeWhen tested in accordance with Annex A, after being subjected to the compaction procedure in accordance withAnnex K, all extinguishers shall operate within 4 s of the control valve being opened. When testing extinguisherspressurised by a separate action, the control valve shall be operated within 6 s after activation.7.4 Effective range of operating temperature7.4.1Tmax and Tmin claimed by the manufacturer shall be used for the tests in 7.4.2 and Annex B.7.4.2Extinguishers shall be able to operate between Tmax and Tmin:¾ Tmaxfor all extinguishers shall be 60 °C or higher;¾ Tminexcluding water based extinguisher, shall be - 20 °C, - 30 °C or lower;¾ Tminfor water based extinguishers shall be + 5 °C, 0 °C, - 5 °C, - 10 °C, - 15 °C, - 20 °C, - 25 °C,- 30 °C or lower. For water based extinguishers without any protection against freezing Tmin shallbe + 5 °C.When tested at Tmax and Tmin temperature limits, in accordance with Annex B, extinguishers shall conform to thefollowing requirements:¾ the discharge shall commence within 10 s of the opening of the control valve;¾ except for CO2 extinguishers, the duration of operation shall be not more than twice the value established at atemperature of 20 °C. CO2 extinguishers shall conform to 7.4.3;¾ the duration of operation shall be not less than 6 s;¾ the residual charge shall be not more than 15 % of the nominal charge for extinguishers containing BC typepowder, and not more than 10 % of the nominal charge for extinguishers containing other media.7.4.3The duration of operation of CO2 extinguishers shall be as follows.At Tmax the duration of operation shall be not more than the value established at a temperature of 20 °C.At the minimum operating temperature, Tmin, the duration of operation shall be not more than 2,5 times the valueestablished at 20 °C.
EN 3-7:2004 (E)148 Retention of propellant8.1 Verification8.1.1 GeneralAll extinguishers and propellant cartridges shall be designed in such a way as to permit their retention of propellantto be checked at regular intervals.8.1.2 WeighingThe following shall be capable of being checked by weight:¾ propellant cartridges;¾ CO2 extinguishers.8.1.3 Pressure measuring methods8.1.3.1It shall be possible to check the retention of pressure of a stored pressure extinguisher, with theexception of carbon dioxide extinguishers, as specified in 8.1.3.2, 8.1.3.3 or 8.1.3.4.8.1.3.2The extinguisher shall be fitted with a connection to enable the internal pressure to be checked directlyby an independent apparatus. Such a connection shall be fitted with a pressure retaining cap (see 8.1.3.1) andshall communicate directly to the contents under pressure. Such a pressure retaining cap can be a cap, pressuregauge or pressure indicator.8.1.3.3Alternatively, the extinguisher shall be fitted with a pressure gauge conforming to 11.1.8.1.3.4Alternatively the extinguisher shall be fitted with a pressure indicator which conforms to 11.2. Inaddition to this device the extinguisher shall also be fitted with a connection which conforms to 8.1.3.2 i
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