Bs en 00003 3 1996 scan

Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan Bs en 00003 3 1996 scan

CEN EN*3-3 94 3404589 0325287 8 b T 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

3-3 : 1996

Copyright European Committee for Standardization

Provided by IHS under license with CEN

``,`-`-`,,`,,`,`,,` -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

``,`-`-`,,`,,`,`,,` -CEN EN*3-3 94 = 3404589 0325289 b 3 2 m

Contents

Committees responsible National foreword

Page

Inside front cover

u Foreword

Text of EN 3-3

2

3

Copyright European Committee for Standardization

Provided by IHS under license with CEN

``,`-`-`,,`,,`,`,,` -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 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 fire 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 fire Specification and Suyuplementaq tests

m-Oviswns f o r the attestation of conformity of portable fire 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 fire

Part 5 : 1996 Specification and supplementa?y tests

Part 6 : 1996 Provisions f o r the attestation of conformity of

portable fire 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 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

``,`-`-`,,`,,`,`,,` -CEN EN*3-3 94 I 3404589 0125291 290 W

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,

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

Copyright European Committee for Standardization

Provided by IHS under license with CEN

``,`-`-`,,`,,`,`,,` -Page 2

EN 3-3 : 1994

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 fire 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, r e s i s t a m to p m m ,

mechanicd tests

Spenikation and supplernenta~ tests

extinguishem in accordance with

E N 3 : Part 1 to Part 5

c o n f m i t y of píwt.uble fire

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

``,`-`-`,,`,,`,`,,` -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

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 i r e

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

under glass, natuml weathering or artificial light

Steel products f o r pressure Part II: Wrought seamless tubes

17September 1984 on the approximation of the laws of the

member states relating to seamless, steel g a s 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

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

P,

P h

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

5.1 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

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

O BSI 1996

Copyright European Committee for Standardization

Provided by IHS under license with CEN

``,`-`-`,,`,,`,`,,` -CEN EN*3-3 94 W 3404589 0125294 T T T 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

``,`-`-`,,`,,`,`,,` -C E N 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

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 D B = (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 P h 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

O BSI 1996

Copyright European Committee for Standardization

Provided by IHS under license with CEN

``,`-`-`,,`,,`,`,,` -Page 6

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 d a c e n t 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 A e t y valve;

- a bursting disc;

and the device shall operate at a pressure > Ps (60 "C)

and <Ph