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CEN EN*3-3 94 3404589 0325287 b T BS EN 3-3:1996 BRITISH STANDARD Portable fire extinguishers Part Construction, resistance to pressure, mechanical tests The European Standard EN 33 : 1994 has the status of a British Standard NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale ``,`-`-`,,`,,`,`,,` - ICs 13.220.30 BS EN 3-3: 1996 Committees responsible for this British Standard "he preparation of this British Standard was entrusted to Technical Committee Fsw2,Fire extinguishers, upon which the following bodies were represented Association of Metropolitan Authorities British Compressed Gases Association British Fïre Protection Systems Association British Fïre SeMces' Association Chief and Assistant Chief Fïre Officers' Association Convention of Scottish Local Authorities Fire Brigades Union Fire Extinguishing Wes Association Home Office Institution of Fire Engineers London Fire and Civil Defence Authority Loss Prevention Council Society of Motor Manufacturers and M e r s Ltd M e s Union Congress ``,`-`-`,,`,,`,`,,` - This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 May 1996 O BSI 1996 Amd No Date Text afỵected The following BSI references relate to the work on this standard: Committee reference FSw2 Draft for comment 92/44838 DC ISBN O 080 26806 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale CEN EN*3-3 94 = 3404589 0325289 b m BS EN 3-3 : 1996 Contents Committees responsible National foreword Foreword Text of EN 3-3 Page Inside front cover u ``,`-`-`,,`,,`,`,,` - i BSI 1996 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale BS EN 3-3: 1996 National foreword This Britjsh Standard has been prepared by Technical Committee FSW2 and is the English ìanguage version of EN 3-3 : 1994 Portable fire extinguishers -Part : Construction, resistance to pressure, mechanical tests published by the European Committee for Standardization(CEN) EN 3-3 was produced as a result of international discussion in which the United Kingdom took an active part Together with BS EN 3,Part to Part 6, BS 7863 and BS 7867l) it supersedes BS 5423 : 1987 which wiü be withdrawn on January 1st 1997 The Parts of BS EN Portable fire extinguishers are as follows: Part Part Part Part Part Part Descrìption, duration of operation, class A and B fire test Tightness, dielectric test, tamping test, special provisions Construction, resistance to pressure, mechanical tests charges, minimum required fire Specification and Suyuplementaq tests m-Oviswnsf o r the attestation of conformity of portable fire extinguishers in accordcmce with EN Part to Part Cross-references Publication referred to EN 3-1 : 1996 EN 3-2 : 1996 EN3-4: 1996 EN : 1996 EN : 1995 IS0 4582 : 1980 Corresponding British Standard BS EN Portable fire extinguishers Part : 1996 Description, duration of operation, class A and B fire test Part : 1996 Tightness, dielectric test, tamping test, s p e d provisions Part : 1996 Charges, minimum required fire Part : 1996Specification and supplementa?y tests Part : 1996 Provisions for the attestation of conformity of portablefire extinguishers in accordance with EN Part to Part BS 2782 Methods of testing plastics Part ûptkal and colour properties, weathering Method 522A : 1981Deterrnination of changes in colour and variations in properties a & r q o s u r e to daylight under glass, natural weathering or artificial light ``,`-`-`,,`,,`,`,,` - Compliance with a British Standard does not of itself confer immunity from legal obligations ')In preparation Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS O BSI 1996 Not for Resale ~ ~ CEN EN*3-3 94 I I 3404589 0125291 290 W EN 3-3 EUROPFAN STANDARD NORMI3 EUR0PEE?E EuROP&CHE NORM March 1994 UDC: 614.845:620.1 Descriptors: Fire fighting, fire equipment, fire extinguishers, movable extinguishers, portable equipment, specifications, tests, setting-up conditions, mechanical tests, drop tesis, pressure tests, hydraulic pressure, non-destructive tests, equipment specifications English version Portable fire extin$uisheis - Construetion, resistance to pressure, mechanical tests Extincteurs d?incendie portatifs - Construction, résistance la pression, essais mécaniques ?íi-agbare Feuerlưscher - Konstmktive Ausíühmng, Druckfestigkeit, mechanische Prüfungen This European Standard was approved by CEN on 1994-01-27, CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Denmark, Fïnland, France, Germany, Greece, Iceland, Ireland, Italx Luxembourg, Netherlands, Norwax Portugal, Spain, Sweden, Switzerland and United Kingdom ``,`-`-`,,`,,`,`,,` - CEN European Committee for Standardization Comité Européen de Normaiisation Europäisches Komitee für Normung Centrai Secretariat: rue de Stassart 36, B-1050 Brussels O 1994 AU rights of reproduction and communication in any form and by any means reserved to CEN and its members Ref No EN 3-3 : 1994 E Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale Page EN 3-3: 1994 CEN EN*3-3 94 Contents Foreword ``,`-`-`,,`,,`,`,,` - This European Standard has been prepared by the Technical Committee CEN/TC 70 (secretariat Belgium) This European Standard is one Part of EN prepared by CENR% 70 The European Standard EN has the general title of Portable fire extinguishem and comprises the following different parts: Part Part Part Part Part Part 3404589 O325292 327 Description, dumtion of opemtion, class A and Bfire test lightness, d.ielectri.c test, tamping test, wprrnrisions construction, r e s i s t a m to p m m , mechanicd tests Chmges, minimum required fire Spenikation and supplernenta~tests pwvisions for the attestation of c o n f m i t y of píwt.uble fire extinguishem in accordance with E N : Part to Part Foreword Scope Normative references Definitions Symbols and abbreviations Welded steel bodies Tests Marlong Additional requirements Propellant gas cartridge 10 Aiumjnium bodies 11 Specincations for plastics components 12 Carbon dioxide portable extinguishers page 3 3 6 10 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 September 1994, and conflicting naüonal standards shall be withdrawn at the -1 by January 1997 According to the CEN/CENELEC Internai Regulations, the foliowing counlxies are bound to implement this European Stcmdard: Austria, Belgium, Denmark, France, G e r n , Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, P o w , Spain, Switzerland, United Kingdom Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS O BSI 1996 Not for Resale CEN EN*3-3 94 = 3404589 0325293 Ob3 = Page EN 3-3 : 1994 Scope Definitions This standard lays down technical specfications for extinguisher bodies and their accessories It applies to the bodies of extinguishers in which the service pressure does not exceed 25 bar and to propellant gas cartridges A specific clause gives requirements relative to carbon dioxide extinguishers' bodies For the purposes of this standard the following definitions apply This European Standard incorporates by dated or undated references, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard oniy when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies Descrption, duration of operation, class A and B fire test Tightness, dielectric test, tamping EN 3-2 test, special provisions Charges, minimum required fire EN 3-4 EN 3-5 Specification and s u p p k n w n t a ~tests Prowìsions for the attestation of EN 3-6 conformity of portable fire extinguishers in mcoràance with EN Part to Part IS0 4582 : 1980 Plastics - Determination of changes in colour and variations in properties a m exposure to daylight under glass, natuml weathering or artificial light IS0 26042 : Steel products f o r pressure 1975 purposes - Quality requirements Part II: Wrought seamless tubes Dir W525 Council directive of 17September 1984 on the approximation of the laws of the member states relating to seamless, steel gas cylinders Dir W526 Council directive of 17September 1984 on the approximation of the laws of the member states relating to seamless, unalloyed aluminium and aluminium d o y gas cylindws EN 3-1 ') bar = 3.2 service pressure Maximum operating pressure measured at 60 "C and 30 s after the release of the propellant inside the extinguisher body 3.3 bursting pressure Minimum plastic instability pressure obtained during a bursting test under pressure Symbols and abbreviations P, Ph Pr Re R, D & 0,l MPa O BSI 1996 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale S is the service pressure in bar'); is the test pressure in bar; is the bursting pressure in bar; is the proof stress given in N/mm2 or in MPa; is the tensile strength given in N / m or in MPa; is the nominal external diameter of the body, or the largest external measurement normal to the longitudinal axis in mm; is the diameter of the mandrel used during the crushing test in mm; is the calculated minimum wall thickness of the body in mm ``,`-`-`,,`,,`,`,,` - Normative references 3.1 body Shell of the extinguisher not fitted with its accessories but fitted with all its welded pasts Welded steel bodies 5.1 Materials 5.1.1 The material used in the construction of the extinguisher bodies shall be weldable and shall contain a maximum of 0,25 % carbon, 0,05 % of sulfur and 0,05 % of phosphorus Before fabrication, the material shall have an elongation A greater than 16 % and a tensile strength R, 580 MPa Examples of suitable products are given in table I below Table Examples of steel Steel grades I Euronorm 130 : FePO1 130 : FePO2 130 : FePO3 130 : FePO4 25 : Fe 360-D I IS0 3574 : cR2 3574 : cR3 3574 : CR4 360 : Fe360-D 2604 T.4 : P26 I ~ Page EN 3-3: 1994 CEN EN*3-3 Au parts of the body and those welded to the body shall be made of mutually compatible materials.The ``,`-`-`,,`,,`,`,,` - ñiier materials shall be compatible with the steel to give welds with properties equivalent to those specified for the base material 94 W 3404589 0125294 T T T For austenitic steel bodies, the minimum thickness measured shall be greater than the minimum thickness calculated using the following formula: D S=-+K 600 5.1.2 The body manufacturer shall be capable of providing certificates of the chemical cast analysis of the steels that are supplied to him for the manufacture of the parts subjected to pressure Independent analyses shall be carried out on samples taken either from the semi-finished product as supplied to the body manufacturer, or from the body The manufacturer shall be capable of providing results from mechanical and metaiiurgical tests carried out on welds and a detailed description of the weldmg processes that are used during manufacture where 5.1.3 For bodies produced from austenitic steel the maximum carbon content shall be 0,03 % Type 304L is a suitable example 5.2.2 Marking of closures The main closures (covers, plugs, ) which are or may be subjected to pressure during normal use shall be indelibly marked to permit subsequent identincation 5.2 Parts subject to pressure 5.2.1 Minimum wall thickness The verification of the design of parts subject to pressure shall be by test deñned in this standard The body shall meet the requirements of the mechanical strength test (crushing test,see 6.2) and the bursting pressure (see 6.1) The body shall have a measured wall thickness greater than the minimum thickness calculated using the following f r n - l ~ D S=-+K 300 where S is the minimum thickness in mm; D is the external diameter of the body, or the largest external measurement normal to the longituàinaì axis in mm; is the coefficient with a value OE O,& for D 80 mm; O,% for D > 80 nun and I100 mm; 0,70 for D > 100 mm K S D K is the minimum thickness in mm; is the external diameter of the body, or the largest extemal measurement normal to the longitudinal curis in mm; is the coefficient,the value of which is 0,30 for diameters 100 mm This is subject to an absolute minimum thickness of O,ô4 mm, including all tolerances 5.3 Construction of bodies 5.3.1 General requirements On his own responsibili@, the manufacturer shall ensure that he has available the manufacturing means and processes suitable for fabricating the bodies in conformity with this standard The manufacturer shaJ ensure that the materials and components used in the fabrication of the body are free from any defect likely to impair the safe use of the extinguisher 5.3.2 Mounting The portable extinguisher shall be constructed so that it may be: - free-standmg on a horizontal surface; - and/or k e d 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 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 wail thickness(es) (see 5.2 and 10.3) 5.3.3 Welded parts Butt welds in the strength envelope shall be formed using an automatic welding procedure and shall not be located in areas where variations of shape exist The welds shall be a continuous penetration with no deviation in the weld Welds and brazed joints shall be free from defects which may impair the safe use of the body O BSI 1996 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale CEN ENJ3-3 = 3404587 0325295 Figure shows examples of acceptance welds Figure 5.3.4 Attached parts Attached parts shall be made and fixed to the body so as not to cause any dangerous stresses or any specific corrosion risks Non-metallic materials may be used for makjng attached parts as long as they are sufficiently robust Tests The tests described in 6.1 and 6.2 shall be carried out on a minimum of 10 bodies These tests are required for an unalloyed steel body 6.1 Burst test under pressure 6.1.1 Test requirements The burst test under pressure shail be carried out using an installation which permits a regular increase of pressure until the body bursts and also permits the variation of pressure to be recorded as a function of time 6.1.2 Interpretation of results The bursting pressure Pishall not be less than 2,7 times the service pressure P, developed inside the apparatus at the temperature of 60 with a minimum of 55 bar The burst test shall not cause the body to fragment The main break shall show no signs of brittìeness, i.e 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 metal The break shall not originate in the body marking area 6.1.3 Marking of bodies The bodies used for the bursting test shall bear ail n o d markings O C , ``,`-`-`,,`,,`,`,,` - Figure O BSI 1996 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale 936 = Page EN 3-3 : 1994 6.2 Mechanical strength test (crushing test) 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 mjnimize the risk of damage to connection points which allow pressurization of the body Damage to these points does not constitute failure and alternative means of pressurizing the body may have to be established The length of the body is the maximum distance between the ends of the pressure envelcpe, excluding any skirt or connection 6.2.1 Long bodies The following method shall be used when the length of the body is greater than 1,5times the outside diameter of the body 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 = (Df 20) mm and of a length sufficient for each end to overlap the crushed body (see figure 2) The body shall be crushed to 10 times its thickness within a period of 30 to 60 seconds 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 filled with water and subjected to the test pressure Ph The body shall not have any cracks or leaks 6.2.2 Short bodies The following method shall be used when the body length is equal to or less than 1,5times the outside diameter of the body The body is crushed perpendicularly to its longitudinal axis at its mid-point using two 25 mm thick mandrels The mandrels shall be radiused for a half cylinder R = 12,5mm and be of sufficient length to extend beyond the sides of the crushed body Crushing, to the dimensions shown in figure shall take place between 30 to 60 s ~ Page EN 3-3: 1994 CEN EN*3-3 94 m 3qOq589 0325296 872 m 6.4 Macroscopic examination The macroscopic examinati ' 'on of a transverse section of the weld 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 -ambition of the suspect area shall be carried out 6.5 Visual examination of the weld An external visual examination of the weld shall be carried out on the complete weid The welded surface to be examined shall be free from grease, dust, slag residue or any protective coabng The transition between the welded metal and the base metal shall be smooth and free from undercuts The welded surface and d a c e n t surface of the body wall shall not have any cracks, nicks or pores R = , ~ + ~ D/3 = Distance between mandrels at completion of cnishing D = Actual outside diameter of cylinder Figure In the case of bodies having a longitudinal weld, the weld seam shall be at 90" to the mandrels For bodies having a circumferential 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 Cuas of the body Foilowing the crushing test, the body shall be ñlied with water and subjected to the test pressure Ph The body shall not have any cracks or leaks 6.3 Pressure test 6.3.1 Test conditions The pressure test shall be carried out using apparatus that permits a reguiar increase of pressure up to the moment the test pressure is reached 6.3.2 Requirements The test pressure qi shall be not less than 1,3 times the service pressure P, developed inside the body at a temperature of 60 "C and shall be a minimum of 20 bar The test pressure shall be maintained for 30 s and the body shall not leak After the test, the body shall not show any visible signs of permanent deformation The body of the portable extinguisher shall bear at least the foilowing markings: - mark of the body manufacturer, - serial or batch number, - year of manufacture; - test pressure in bar The marks shall be applied to the metal of the body by stamping or engraving Additional requirements 8.1 Closures The closures of the portable extinguishers shall be capable of depressurizing the body before their complete removal 8.2 Pressure relief devices A pressure relief system is not mandatory except on CO2 extinguishers If a pressure relief system is to be used, it may comprise: - a Aety valve; - a bursting disc; and the device shall operate at a pressure > Ps (60"C) and Ps and < ph of the body, including all tolerances a Crestwidth b Thread pitch c Thread included angie 12.3 The closures of the bodies shall have either tapered or parallel threads Figure Screw creation ``,`-`-`,,`,,`,`,,` - O BSI 1996 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale CEN EN*3-3 94 m 3404589 012530L TbT m BS EN 3-3 : 1996 List of references ``,`-`-`,,`,,`,`,,` - See national foreword Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale CEN EN*3-3 94 W 3404589 0325302 T b W BS EN 3-3 : 1996 BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents die UK view on standards in Europe and at the international level It is incorporated by Royal Charter Contract requirements A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the responsible technical committee, the identity of which can be found on the inside front cover Tel 0181 996 9ooo; Fax: 0181 9967400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign stcuidards publications should be addressed to Customer Services, Sales Department at Chiswick Tel 0181 9967000; Fax: 0181 996 7001 In response to orders for intemational standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Libmy, the Standardline Database, the BSI Information Technology Service (BITS)and its Technical Help to Exporters Service Contact the Information Department at Chiswick Tel 0181 996 7111; Fax: 0181 996 7048 Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Customer Services, Membership at Chiswick Tel O181 996 7002; Fax: 0181 996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means - electronic, photocopying, recordmg or otherwise - without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtajned from the Copyright Manager, BSI, 389 Chiswick High Road,London W4 4AL BSI 389 Chiswick High Road London w4 4AL Fsw2 ISBN O 580 25855 Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or networking permitted without license from IHS Not for Resale ``,`-`-`,,`,,`,`,,` - Revisions