bs en 00003-3-1996 scan

CEN EN*3-3 94 3404589 0325287 8bT

BRITISH STANDARD

Portable fire extinguishers Part 3. Construction, resistance to pressure, mechanical tests

The European Standard EN 33 : 1994 has the status of a British Standard

ICs 13.220.30

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BS EN 3-3 : 1996

Copyright European Committee for Standardization Provided by IHS under license with CEN

Not for ResaleNo reproduction or networking permitted without license from IHS

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BS EN 3-3 : 1996

Amd. No. Date

Committees responsible for this British Standard

Text afîected

"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

The following BSI references relate to the work on this standard: Committee reference FSw2 Draft for comment 92/44838 DC

ISBN O 080 26806 6



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CEN EN*3-3 94 = 3404589 0325289 b32 m BS EN 3-3 : 1996

Contents

Committees responsible National foreword

Page Inside front cover

u Foreword Text of EN 3-3

2 3

0 BSI 1996 i Copyright European Committee for Standardization Provided by IHS under license with CEN


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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 f ire extinguishers -Part 3 : 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 1 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 3 Portable f ire extinguishers are as follows:

Part 1 Part 2 Part 3 Part 4 Part 5 Part 6

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 f ire Specification and Suyuplementaq tests m-Oviswns f o r the attestation of conformity of portable f ire extinguishers in accordcmce with EN 3 Part 1 to Part 5

Cross-references Publication referred to

EN 3-1 : 1996

EN 3-2 : 1996

EN3-4: 1996 EN 3 5 : 1996 EN 3 6 : 1995

IS0 4582 : 1980

Corresponding British Standard BS EN 3 Portable fire extinguishers Part 1 : 1996 Description, duration of operation, class A and B fire test Part 2 : 1996 Tightness, dielectric test, tamping test, s p e d provisions Part 4 : 1996 Charges, minimum required f ire Part 5 : 1996 Specification and supplementa?y tests Part 6 : 1996 Provisions for the attestation of conformity of portable f ire extinguishers in accordance with EN 3 Part 1 to Part 5 BS 2782 Methods of testing plastics Part 5 ûptkal and colour properties, weathering Method 522A : 1981 Deterrnination of changes in colour and variations in properties a&r qosure 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.

O BSI 1996 Copyright European Committee for Standardization Provided by IHS under license with CEN


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CEN EN*3-3 94 II 3404589 0125291 290 W

EUROPFAN STANDARD EN 3-3 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 à la pression, essais mécaniques

?íi-agbare Feuerlöscher - 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



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EN 3-3 : 1994

CEN EN*3-3 94 3404589 O325292 327

Foreword

This European Standard has been prepared by the Technical Committee CEN/TC 70 (secretariat Belgium). This European Standard is one Part of EN 3 prepared by CENR% 70. The European Standard EN 3 has the general title of Portable f ire extinguishem and comprises the following different parts:

Part 1

Part 2

Part 3

Part 4 Part 5 Part 6

Description, dumtion of opemtion, class A and Bfire test lightness, d.ielectri.c test, tamping test, w p r r n r i s i o n s construction, re s i s tam to p m m , mechanicd tests Chmges, minimum required fire Spenikation and supplernenta~ tests pwvisions for the attestation of

extinguishem in accordance with E N 3 : Part 1 to Part 5

c o n f m i t y of píwt.uble f ire

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.

Contents

Foreword 1 2 3 4 6 6 7 8 9

10 11 12

Scope Normative references Definitions Symbols and abbreviations Welded steel bodies Tests Marlong Additional requirements Propellant gas cartridge Aiumjnium bodies Specincations for plastics components Carbon dioxide portable extinguishers

page 2 3 3 3 3 3 5 6 6 7 8 9

10



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CEN EN*3-3 9 4 = 3404589 0325293 Ob3 =

1 Scope 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.

2 Normative references 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.

EN 3-1

EN 3-2

EN 3-4 EN 3-5 EN 3-6

Descrption, duration of operation, class A and B fire test Tightness, dielectric test, tamping test, special provisions Charges, minimum required f ire Specification and s u p p k n w n t a ~ tests Prowìsions for the attestation of conformity of portable fire extinguishers in mcoràance with EN 3 Part 1 to Part 5

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 Steel products for pressure

Part II: Wrought seamless tubes

17September 1984 on the approximation of the laws of the member states relating to seamless, steel gas cylinders

17September 1984 on the approximation of the laws of the member states relating to seamless, unalloyed aluminium and aluminium d o y gas cylindws

IS0 26042 : 1975 purposes - Quality requirements

Dir. W525 Council directive of

Dir. W526 Council directive of

Page 3 EN 3-3 : 1994

3 Definitions For the purposes of this standard the following definitions apply. 3.1 body Shell of the extinguisher not fitted with its accessories but fitted with all its welded pasts. 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.

4 Symbols and abbreviations

P, Ph

Pr Re R, D

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 2 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.

&

S

5 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, 5 580 MPa. Examples of suitable products are given in table I below.

Table 1. Examples of steel Steel grades

I Euronorm I I S 0 I 130 : FePO1 130 : FePO2 130 : FePO3 130 : FePO4 25 : Fe 360-D

3574 : cR2 3574 : cR3 3574 : CR4 360 : Fe360-D

2604 T.4 : P26

') 1 bar = 0,l MPa.



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CEN EN*3-3 94 W 3404589 0125294 TTT Page 4 EN 3-3 : 1994

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.

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.

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 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 0 r n - l ~

D S = - + K 300 where

S D

is the minimum thickness in mm; 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 5 80 mm; O,% for D > 80 nun and I 100 mm; 0,70 for D > 100 mm.

K

For austenitic steel bodies, the minimum thickness measured shall be greater than the minimum thickness calculated using the following formula:

D S = - + K 600 where

S D

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 2 100 mm.

K

This is subject to an absolute minimum thickness of O,ô4 mm, including all tolerances.

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.

5.3 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 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 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.



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CEN ENJ3-3 9 4 = 3404587 0325295 936 = Page 5 EN 3-3 : 1994

Figure 1 shows examples of acceptance welds.

Figure 1.

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.

6 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 Pi shall not be less than 2,7 times the service pressure P, developed inside the apparatus at the temperature of 60 O C , 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.

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 1,5 times 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 = (D f 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 1,5 times 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 = 12,5 mm and be of sufficient length to extend beyond the sides of the crushed body. Crushing, to the dimensions shown in figure 3 shall take place between 30 to 60 s.

Figure 2.



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EN 3-3 : 1994

~

CEN EN*3-3 94 m 3qOq589 0325296 8 7 2 m

R = 1 2 , 5 ~ + 1 ~

D/3 = Distance between mandrels at completion of cnishing D

Figure 3. = Actual outside diameter of cylinder

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.

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 dacent surface of the body wall shall not have any cracks, nicks or pores.

7 Marking 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.

8 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 <Ph.



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CEN EN*3-3 94 3404589 0325297 709 =

9 Propellant gas cartridge Propellant gas cartridges are used in portable extinguishers pressurized at the moment of their use.

9.1 Rechargeable cartridge

9.1.1 Construction The cartridges shall be made of steel, aluminium or aluminium alloy. The internal volume shall be less than 500 cm3. The cartridges chal be made of a steel intended for the construction of a pressure vessel. If the cartridges are made from seamless steel tube, the material shall conform at least to IS0 26042 : 1975. Aiuminium of aluminium alloy cartridges shall be niade of aluminium whose properties conform to the requirements of 2.1.2 of annex 1 of EEC Directive #526. The mechanical properties of the steel, aluminium or aluminium alloy used shall ensure that the minimum burst pressure requirement is met. The carbon dioxide Cartridges shall have a filling density 5 0,750 kgíi.

9.1.2 Pressure test Gas (compressed and liquified) cartridges shall be designed for a test pressure equal to 1,3 times the service pressure at a temperature of 60 "C. The minimum burst pressure shall be 1,5 times the test pressure. Each cartridge shall be subjected to the pressure test. This pressure shall be applied for an adequate duration to ensure that it is leaktight. No deformation visible to the naked eye shall occur. One cartridge in one thousand shall be subjected to the burst pressure test. If the manufacturer's batch is < 1000 pieces, one cartridge per batch shall be subjected to the test. A manufacturing batch is taken to mean a number of pieces manufactured at the same manufacturing plant, under the same manufacturing conditions to the same manufacturing requirements and with the same personnel. During the burst test, the rate of increase of the pressure shall not exceed 2 barh. The cartridge shall remain leaktight up to the burst pressure. Any burst shall only occur in the cylindrical part of the cartridge as a ductile burst. If the cartridge does not meet this requirement, five more cartridges from the same batch shall be subjected to the same burst pressure test. If one of these cartridges is defective, the remainder of the batch shall be rejected.

Page 7 EN 3 3 : 1994

9.1.3 Marking The cartridges shall have at least the foilowing markings: - actual empty mass in g; - theoretical full mass in g; - mass of COZ expressed in g or charging pressure of the compressed gas in bar; - year of manufacture; - mark or name of the manufacturer.

The marking shall not become damaged during normal handling in manufacture and use and shall remain clearly legible.

9.2 Non-rechargeable cartridge

9.2.1 Construction Non-rechargeable cartridges shall be made of steel or aluminium alloy. Those with an internal volume > 50 cm3 shall meet the requirements of 9.1. Carbon dioxide cartridges shall have a filling density 5 0,750 kgíi.

9.2.2 Pressure tests This clause applies to cartridges with an internal volume 5 50 cm3. Carbon dioxide cartridges shall have a test pressure of 250 bar. Those containing a compressed gas shall have a test pressure of 1,3 times the service pressure measured at a temperature of 60 "C. The minimum burst pressure shall be 450 bar. Any burst shall only occur in the cylindrical part in the form of a ductile burst. Non-rechargeable cartridges shall remain le&ght for a storage period of 6 h at a temperature of (SO + 5) "C and shall not have any permanent deformation.

9.2.3 Marking The cartridges shall have at least the following markings: - actual empty mass in g; - theoretical full mass in g; - mass of CO2 expressed in g or c h a r m pressure of the compressed gas in bar; - year of manufacture; - mark or name of the manufacturer.

The marking shall not become damaged during normal handling in manufacture and use and s h d remain clearly legible.

O BSI 199ö Copyright European Committee for Standardization Provided by IHS under license with CEN


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EN 3-3 : 1994

I Fe % 1 si 9995 0,25 0,40

Mg Zn

0.05 0.07

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CEN EN*3-3 94 W 3404589 0125298 hq5 W

I Mn Cu

0,05 0,05

Ti Others each

0.05 0.03

10 Aluminium bodies 10.1 Materials and their identification The material used for manufacturing impact extruded bodies shall be pure duminium, i.e. unalloyed aluminium with an aluminium content of at least 99,5 % and shail meet the criteria of table 2 below. The mechanical properties of non-heat treatable aluminium materiais shall be as follows:

- EN AW - 1050A (Al99,5) H 17 - tensile strength

R, min. = 130 N/mm2 R, ma^. = 170 N/mm2;

Rpo,2 = Re min. = 110 N/mm2 - proof stress

- elongation

-hardness A5 min. = 4%,

HB 5/62,5 = 40

Acceptable d t e d v e s are EN AW - 3002 (AlMnO, 2Mg0,l) and EN AW - 3003 (AlMnlCu) or equivalent. if the manufacturing process is not impact extrusion, other materials may be used but their mechanical properties shall have at least the above values. The body manufacturer shall provide attestations of the cast analysis of the material supplied and keep them available and declare the type of materiai used. Independent chemical analysis shall be carried out. Samples for analysis shall either be semi-nnished products that the manufacturer of the bodies shall supply or shall be taken from the íinished body. The shape of the base of the bodies is not specined.

The dimensional requirements are deemed to have been met if, during the type testing, the requirements of the following tests are met:

10.2 Testing

- burst pressure (6.1); - test pressure (6.3); - mechanical strength (crushmg test) (6.2).

10.3 Parts subject to pressure

10.3.1 Impact extruded bodies The measured wall thickness of the bodies shall be not less than the thickness calculated using the following formula:

D S = - + K 80 Where

S istheminimumthicknessinmm; D is the externaì diameter of the body, or the

largest external measurement n o d to the longitudinal axis in mm; is the coefficient with a value of: 0,20 for D 5 100 mm; 0,30 for D > 100 mm.

K

10.3.2 Other @pes of bodies The measured wall thickness of the bodies shall be not less than the thickness calculated using the following

formula

\ I r ' /

where

S D

is the minimum thickness in mm; is the external diameter of the body, or the largest external measurement normal to the longitudinal axis in mm;

P, is the service pressure at 60 "C in bar; R, is the tensile strength in N/mm2.

In no case shall the wall thickness be less than: - S = 0,9 for D < 100; - S = 1,2 for D 2 100.

I 'hble 2. Aluminium properties I Designation

EN AW - 1050A

Al content I Maximum permitted imDurities % by mass Total Fi



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CEN EN*3-3 94 m 3404587 0325299 583 m

< 6 2 6

11 Specifications for plastics components 11.1 General The test and verifications shall be carried out on components conforming at every point to mass produced components with regard to the material used, the shape and the manufacturing process. The plastics material used shall always be identifíable. Any modification of the material, shape or manufacturing process shall necessitate a new test. The components shall be verified in the asdelivered condition with regard to their conformity with the manufacturing plan, their appearance, dimensions and weight. The manufacturer shall prove by means of regular inspection of the manufacturing process that the requirements of this standard are met in mass production.

11.2 Requirements for plastics components subject to pressure For components subject to pressure, the specifications of 11.2.1 to 11.2.6 are applicable. The manufacturer of components subjected to pressure shall make available dah sheets relating to the product and to its processing.

11.2.1 Three components shaü be subjected to the burst pressure by means of suitable liquid at a temperature of (20 f 3) O C , (60 * 3) "C and of (- 20 f 3) "C or, if the components are used in specific low-temperature countries, at a temperature of (- 30 f 3) "C. The rate of increase of pressure shall not exceed 2 barls. The burst pressure shall be at least equal to 3,4 times the service pressure measured and shall be not less than 55 bar. NOTE. Countries specified as low-temperature countries are Austria, Finland, Iceland, Norway and Sweden.

11.2.2 Three plastics components normally subject to pressure in the operating condition shall be conditioned at a temperature of (60 f 3) "C for 500 h. Then they shall be conditioned in an atmosphere of 50 % relative humidity and at a temperature of (20 f 3) "C until their weight stabilizes. Then they shall be checked to see that they comply with the manufacturing plans, appearances, dimensions and weight. The plastics components shall then be subjected to the burst pressure by means of suitable liquid at a temperature of (20 f 3) "C with a rate of increase of pressure of 2 barls. The burst pressure shall be at least equal to 3,4 times P, and shall be not less than 55 bar.

300 500

Page 9 EN 3-3 : 1994

11.2.3 Six components shall be subjected to an artificial ageing test over 500 h as described in IS0 4582 : 1980. Then, they shall be conditioned in an atmosphere with a relative humidity of 50 % and at a temperature of (20 3) "C until their weight stabilizes. Then, they shall be checked to see that they comply with the manufacturing plans, appearances, dimensions and weight. A change in colour is permitted. Three of these plastics components shall then be subjected to a burst pressure test using a suitable liquid at a temperature of (20 3) "C with a rate of increase of pressure of 2 bark Three components shall be subjected to the burst pressure using a suitable liquid at a temperature of (- 20 f 3) "C or, if the components are used in low-temperature countries, at a temperature of (- 30 f 3) "C. The burst pressure SM be at least equal to 3,4 times Ps and shall be not less than 55 bar. NOTE. Countries specified as low-temperature countries are Austria, Finland, Iceland, Norway and Sweden.

11.2.4 Five components shall be subjected to an artiñcial ageing test as described in IS0 4582 : 1980, for a period of 500 h. They shaü then be stored in an atmosphere with a relative humidity of 50 % and a temperature of (20 f 3) "C until their weight stabilizes. Then, the plastics components shall be fitted to the portable extinguishem which are 95 % ñlìed with water and pressurized with nitrogen up to the service pressure. The portable extinguishem shall then be subjected to the impact test with an impact on the top and the four sides of the apparatus. In the impact test, the hammer shall be made of steel, be cylindrical with a diameter of 75 mm and have a total mass of 4 kg, its bottom surface flat and it shall be capable of free falling. The drop height is given in table 3 below.

I Table 3. Drop height for hammer test

One new plastics component may be used for each test. During the test, no change which is capable of affecting safety shall appear in the component (scaiing, fracture, crack). Nondangerous leaks are acceptable.



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CEN EN*3-3 94 3404589 0125300 023 =

11.2.5 Plastidmetai threaded connections between the cylinder and the actuating device andor closure shall be designed so as to avoid the possibility of the plastics thread becoming damaged when coming into contact with the metal thread. When the body closure is retained by a screw thread or threads produced in a non-metallic material, all threads not having the characteristics deñned below shall be prohibited - the thread pitch shall be 2,9 mm minimum and the width of the thread crest of both components, when measured n o d to the helix angle, shall be 2 0,6 mm; - the included angie of the threaà form when measured normai to the helix angle shall be 2 18 (see figure 4); - the length of incomplete thread at the start of the non-metallic thread shall be no greater than the actual depth of the thread. The start of the thread is that part which is first engaged with the mating component as the two are assembled.

t i 1 b b i Ii

a Crestwidth b Thread pitch c Thread included angie

Figure 4. Screw creation

Prior to carrying out the tests in accordance with 11.2.1, 11.2.2 and 11.2.3, each sample shall be prepared in the following manner - screw and unscrew the closure 100 times with its mating part, tightening each time in accordance wíth the manufacturer's maintenance instnictions; - condition samples in accordance with the requirements of 11.2.1,11.2.2 and 11.2.3.

NOTE. If the closure seals are of the replaceable type, then new seals shall be fitted immediately, prior to carrying out the burst tests and at any time during the screwingíunscrewing cycle when deterioration is evident.

11.2.6 The requirements of 11.2 do not apply to jet control devices at the end of portable extinguisher hoses; the requirements of 3.4 of EN 3 : Part 5 shall apply.

12 Carbon àioxíde portable extinguishers 12.1 The steel, alumjnium or aluminium alloy bodies are containem fitted with accessories which have an innuence on safew. They shall meet all the requirements in - either the European Directives W525, W526 or any other future European Directives; - or those contained in the national regdations existing in the country of use including requirements for periodic testing.

12.2 A safety device shall be provided on these types of extinguisher. Only bursting discs are permitted as a safety device. The bursting pressure of the discs shall be > Ps and < ph of the body, including all tolerances.

12.3 The closures of the bodies shall have either tapered or parallel threads.



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CEN EN*3-3 94 m 3404589 012530L TbT m BS EN 3-3 : 1996

List of references

See national foreword.



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CEN EN*3-3 94 W 3404589 0325302 9Tb W

BS EN 3-3 : 1996

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