Is-4947 Gas Cartridges for Use in Fire Extinguishers

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IS: 4947 -1985

Indian Standard SPECIFICATION FOR

GAS CARTRIDGES FOR USE IN FIRE EXTINGUISHERS

( Second Revision )

Fire Fighting Sectional Committee, BDC 22

Cf&man Representing

SHRI G. B. MENON Gujarat Electricity Board, Vadodara

Members

SHRI S. R. BANSAL Steel Authority of India Ltd ( Bokaro Steel Plant ), New Delhi

SERI B. L. CHAUDHRY Oil and Natural Gas Commission, Dehra Dun SERI B. K. SEPY ( Alternate )

SHRI K. K. DAS G~PTA West Bengal Fire Services, Government of West Bengal, Calcutta

DEPUTY INSPECTOR GENERAL Ministry of Railways ( RPSF )

ASSISTANT SECURITY OFFICER ( FLRE ) NORTEERN RAILWAY ( Alternate )

SHRI S. M. DES~I State Bank of India, Bombay SHRI V. P. DEWAN Ministry of Defence ( DC1 )

LT-COL V. R. BANAHATI ( Alternate ) SHRI S. K. DHERI Municipal Corporation of Delhi ( Delhi Fire

Service ), Delhi SHRI R. K. B~IARDWAJ ( Alternate J

SHRI R. R. DHOBLEY DIRECTOR

Bhabha Atomic Research Centre, Bombay Home Department ( Fire Service ), Government

of Tamil Nadu, Madras Dmnm DIRECTOR ( Alternate )

DIRECTOR GENERAL OF FIRE SERVICES

DEPUTY DIRECTOR ( FIRE SERVICES ) ( Ahrnatc )

FIRE ADVISER SHRI A. K. GUPTA

SHRI J. S. JAMJHEDJI

SHRI C. GNANRAJ ( Alternate )

Home ( Police ) Department, Government of Andhra Pradesh, Hyderabad

Ministry of Home Affairs Central Building Research Institute ( CSIR ),

Roorkee Steelage Industries Limited ( Minimax Division ),

Bombay

( Continued on page 2 )

@ Copyright 1986

INDIAN STANDARDS INSTITUTION

This publication is protected under the Zndian Copyright Act ( XIV of 1557 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

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IS : 4947 - 1985

( Ctntmutd from page 1 )

Mtmbtrs

Soar P. KIIANNA SRRI S. N. KUNDU MANAQINQ DIRIWTOR

Rtprtstnting

Jayashree Textiles and Industries, Rishra Fire and Safety Appliances Co, Calcutta Avon Services ( Production and Agencies ) Pvt Ltd,

Bombay TECXNIC,+L EXECUTIVE ( Alttrnate )

SHRI P. N. MEHROTRA Institution of Fire Engineers ( India ), New Delhi SHRI B. R. MEHTA ( Alternate )

BRIQ S. A. MOHILE Ministry of Defence ( R & D ) SHRT A. K. SURI ( Alttrnatt )

SEIRI M. MUKHERJI Steel Authority of India Ltd ( Rourkela Steel Plant ), Rourkela

SHRI C. D. SHARMA ( Alttrnatt ) &RI V. B. NII~AD~ Municipal Corporation of Greater Bombay

( Bombay Fire Brigade ), Bombay SHRI P. N. PANOHAL Central Industrial Security Force ( Ministry of

Home Affairs ), New Delhi SHRI H. M. SABADRA Reliable ( Fire Protection ) Industries, Bombay SHRI P. H. SETHNA Kooverji Devshi and Co Pvt Ltd, Bombay

SHI~I N. T. PANJWANI ( Alttrnatt ) SERI R. C. SHARMA Directorate General of Supplies and Disposals,

New Delhi SHRI D. S. NARESH ( Ahrnatt )

SHRI D. K. SIREAR Synthetics and Chemicals Ltd, Bareilly SHRI CHANDRAEANT M. SHAH Zenith Fire Services, Bombay

SHRI M. H. SHAH ( Alttrtratt ) SIIRI B. J. SHAH Newage Industries, Surendranagar

SRRI A. M. SHAH ( Alternatt ) SHRI TARIT SUR Surex Production and Sales ( P ) Ltd, Calcutta SHRI SUSHIL KUMAR Directorate General of Technical Development,

New Delhi SHRI J. N. VAUIL Tariff Advisory Committee, Bombay

SHRI K. RAVI ( Ahnatt ) SHRI S. VEN~ASWAMY Directorate General of Civil Aviation, New Delhi SHRI B. V. WAQLE Urban Development, Public Health and Housing

Department, Government of Maharashtra, Bombay

SRRI V. H. MADKAIRAR ( Alttrnatt ) SHRI G. RAMAN, Director General, IS1 ( Ex-oficio Mtmbtr )

Director ( Civ Engg)

SHRI K. M. MATHUR Joint Director ( Civ Engg ), IS1

( Continutd on pgt 9 )

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IS:4947 -1985

Indian Standard SPECIFICATION FOR

GAS CARTRIDGES FOR USE IN FIRE EXTINGUISHERS

( Second Revision )

0. FOREWORD

0.1 This Indian Standard ( Second Revision ) was adopted by the Indian Standards Institution on 23 September 1985, after the draft finalized by the Fire Fighting Sectional Committee had been approved by the Civii Engineering Division Council.

0.2 Since the capacity of the gas cartridge is less thanWQ ml, the same does not come under the purview of gas cylinder rules. Therefore, a separate Indian Standard has been formulated SO a3 io ensure a high standard of manufacture in the interest of safety since &ese are used in the form of highly pressurized container for operating stored pressure type fire extinguishers in the form of refill.

0.3 This standard was first published in 1968 and revised in 1977. The principal modifications made in this revision are provision of rationalized capacities, modification in the specification for the material based on the indigenous availability and standardizing the fixing arrangement with fire extinguishers.

0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accord- ance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard lays down the requirements in respect of material, construction, fixing arrangement, capacities and performance require- ments of gas cartridges used for fire extinguishers.

*Rules for rounding off numerical values ( revised ). 3

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IS:4947 - 1985

2. GENERAL REQUIREMENTS

2.1 The gas cartridge consists of a cylindrical body, an outlet connection with sealing device ( disc or frangible ) according to arrangement shown in Fig. 1.

3. MATERIAL

3.1 The steel used for the body shall satisfy the following properties:

a) Chemical Composition

i) Carbon ii) Silicon

iii) Sulphur

iv) Phosphorus :

v) Manganese :

b) Physical Properties

i) Tensile strength :

ii) Yield stress :

iii) Percentage elongation :

O-3 percent, Max

0.35 percent, Max

0.05 percent, Max

0.05 percent, Max

0.8 percent, Max

35 kgf/mmz, Min

25 kgf/mmz, Min

20 percent, Min

3.2 The outlet connection and the sealing device and other fittings shall either be of non-ferrous metal or of stainless steei according to the requirements given in IS : 3224- 1979’.

4. CONSTRUCTION

4.1 The gas cartridge shall be manufactured from seamless or welded steel tube or by deep drawing from flat plate. The end shall be closed .such that, the minimum material thickness is not less than the thickness of the parallel portion. When welded tubes are used or hole in the bottom is welded, it shall be designed so as to allow higher strength ( see 6.2 ). The general shape of the body and essential dimensions are

given in Fig. 1. The shell of the cylindrical portion shall not vary from the cylinderical form by more than 2 percent of the nominal outside diameter at the point measured. The deparature from circularity shall be gradual. The outlet connection shall be permanently attached to the body after tightening the threaded portion by soldering.

5. CAPACITY AND CONTENTS

5.1 The gas cartridge shall have maximum filling ratio ofO.667, which is the ratio of mass of carbondioxide ( see IS : 307-1966t ) charged in the container to the mass of water required to fill the container at 27°C.

*Specification for valve fittings for compressed gas cylinders excluding liquefied petroleum gas ( LPG ) cylinders ( second revision ).

@pecification for carbon dioxide ( second rcuision ).

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16 : 4947 - 1985

The quantity filled for the various nominal capacity shall be as follows:

Nominal Capacity Quality

a) 20 gms

b) 40 gms

c) 60 gms

d) 90 gms

e) 120 gms

f) 180 gms

:

g) 200 gms :

h) 300 gms :

20 + 5 - 0gms

40 + 5 -0gms

60+ lo - 0gms

go+10 - 0 gms

120 + lo .- o gms

180 + lo - 0 gms

200 + lo - 0gms

300 + lo ‘.

- Ogms

The water capacity of the container shall be adequate to fill maximum quantity permissible within the prescribed filling ratio.

6. PERFORMANCE REQUIREMENTS

6.1 Each gas cartridge shall be subjected to internal hydraulic pressure of 250 bar for a minimum period of one minute before filling. Any leakage deformation, bulging and permanent stretch exceeding 10 percent shall constitute failure. 6.2 In case of ultimate failure test, it shall be tested in a well protected test rig, subjected to internal proof pressure equal to 550 bars for seamless body and 650 bars for the other types ( see 4.1). The bursting ( structural failure ) shall nqt occur. The pressure shall then be raised until the gas cartridge bursts. The bursting shall not cause fragmentation of the gas cartridge and the main tear shall not be a brittle type, that is, the edges of, the fracture shall not be radial but shall be sloped in relation to the diametral plane.

6.3 Each cartridge shall be subjected to leakage test and for this purpose the cartridge shall be charged and stored in the container mixed with the extinguishing media for 21 days. The cartridge shall not show any sign of internal or external corrosion as well as loss in weight equal to a maximum of 10 percent.

6.3.1 Alternatively the cartridge after being covered by inverted glass/ transparent jar shall be dipped in a suitable water tank filled with water, the level of which is sufficiently higher than height of cartridges for 30 h. There shall not be any collection of even a single bubble on the inside top

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IS:4947-1985

of the inverted glass after elapse of 30 h. ( The air bubbles collected in first 6 h shall be neglected. )

6.4 The sealing device shall be so designed that the gas cartridge shall automatically discharge the content if the temperature inside the gas cartridge reaches is 75°C or 90 percent of the minimum pressure mentioned in 6.2 whichever is occurs first ( see 6.2 ).

7. FINISH

7.1 The inside and outside surface shall be smooth and the material section shall be uniform. The external surface shall be properly cleaned and treated with anti-corrosion treatment of lead tin alloy ( tin not less than 10 percent ) or zinc coating with minimum coating thickness of 20 microns.

8. MARKING

8.1 Each cartridge shall be clearly and permanently marked with the following information by embossing or punching, near its neck:

a) Name of the manufacturer or his trade-mark,

b) Type of construction, realing device and capacitry,

c) Gross mass of the charged cartridge,

d) Mass of the empty cartridge, and

e) Year of manufacture.

8.1.1 The cartridge may also be marked with the IS1 Certification Mark.

NOTE - The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act, and the Rules and Regu- lations made thereunder. The IS1 Mark on products covered by an Indian Standard conveys the assurance that they have been produced to compIy with the require- ments of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by IS1 and operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Details of conditions, under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, mav be obtained from the Indian Standards Institution.

9. SAMPLING AND CRITERIA FOR CONFORMITY

9.1 Lot - All gas. cartridges of the same type an3 capacity produced by the same manufacturer shall be grouped together to constitute a lot.

9.2 For ascertaining the conformity each lot shall be considered individu- ally for the purpose of evaluation of quality in accordance with this specification.

9.3 The number of samples to be taken from a lot shall depend on the sizes of the lot and shall be according to Table 1 which shall be selected at random from a lot.

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IS:4947- 1985

TABLE 1 FOR LOTS PRODUCED UNDER QUALITY CONTROL SYSTEM

( Clause 9.3 )

NUMBER OFITEMS INTHELOT

SAMPLESIZE

(1) (2)

Up to 25 3

26 to 50 5

51 to 100 8

101 and up to 300 8 percent

9.4 Each of the samples selected according to 9.3 shall be examined visually as far as possible in respect of requirements specified in 2, 4, 5 and 8 and in respect of hydraulic pressure, etc ( see 6.1), leakage ( see 6.3 ) and finish ( see 7 ). The lot shall be considered to be in conformity with this requirement if all the samples pass the relevant requirements.

9.5 In respect of ultimate failure test ( SCG 6.2 ) and sealing disc ( see 6.4 ) the manufacturer shall issue a certificate with the lot to the effect that this test had been performed and found satisfactory in respect of the type of gas cartridge presented in the lot. Alternatively one sample shall be tested from the lot and shall meet the requirements given in this clause in the lot to be considered satisfactory in respect of requirements.

9.6 In the absence of a certificate from a manufacturer that all the component parts and fittings are conforming to the requirement of this specification, from a sample gas cartridge one item each of all the component parts and fittings shall be taken separately and examined individually in respect of the relevant requirements laid down in 3. The

I lot shall be considered satisfactory in respect of component parts and fittings if the sample meets the relevant requirements.

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( Continued from page 2 )

Fire Fighting

Convener

SHRI G. B. MENON

Members

SRRI S. M. DESAI Snnr V. P. DEWAN

IS: 4947 -1985

Equipment Subcommittee, BDC 22 : 2

Representing

Gujarat Electricity Board, Vadodara

State Bank of India, Bombay Ministry of Defence ( DGI ) ,.._ .\

LT-COL V. R. BANAHATI ( Alternate ) FIRE ADVISER Ministry of Home Affairs SHRI C. GNANRAJ Steelage Industries Ltd, Madras SRRI P. N. MEHROTRA

SRRI B. R. MEHTA ( Alternate ) Institution of Fire Engineers ( India ), New Delhi

BRIQ S. A. MOHILE SHRI A. K. SURI ( Ahernate )

Ministry of Defence ( R & D )

SHRI P. N. PANCEAL Central Industrial Security Force ( Ministry of

SHRI HARISH SALOT Home Affairs ), New Delhi

SEW P. H. SETHNA Vijay Fire Protection Systems Pvt Ltd, Bombay Kooverji Devshi and Co Pvt Ltd, Bombay

SHRI N. T. PANJWANI ( Altarnata ) SHRI JITENDRA SHAE SHRI D. K. SIRKAR

Safex Fire Services, Bombay

SHRI TARIT SWR Synthetics and Chemicals Ltd, Bareilly

SHRI J. N. VAKIL Surex Production and Sales ( P ) Ltd, Calcutta

SERI K. RAVI ( AIternate ) Tarrif Advisory Committee, Bombay

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BWERNAWiONAL SYSTEM OF UNITS ( SI UNITS )

Base Units

QUANTITY

Length

Mass

Time

Electric current

Thermodynamic temperature

Luminous intensity

Amount of substance

Supplementary Units

QUANTITY

Plane angle

Solid angle

Derived Units

QUANTITY

Force

Energy

Power

Flux

Flux density

Frequency

Electric conductance

Electromotive force

Pressure, stress

UNIT

metre

kilogram

second

ampere

kelvin

candela

mole

UNIT

radian

steradian

UNIT

newton

joule

watt

weber

tesla

hertz

siemens

volt

Pascal

SYMBOL

m

kg S

A

K

cd

mol

SYMBOt

rad

sr

SYMriOL

N J W

Wb

T

HZ

s

V

Pa

DEFINITION

1 N = 1 kg.m/ss

1 J = 1 N.m

1 W = 1 J/s

1 Wb = 1 V.s

1 T = 1 Wb/ms

1 Hz = 1 c/s (s-r)

1 S = 1 A/V

1 V = 1 W/A

1 Pa = 1 N/m”

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AMEkMENT 6. 1 JULY 1987

TO

X:4947-1985 SPECIFICATION FOR GAS CARTRIDGES FOR USE IN FIRE EXTINGUISHERS

(Second Revision)

(Page 5, Fig.11 - Add the following note:

'NOTE - For a period of three years in order to make available the gas cartridges to the existing fire extinguishers, the following types of L/H threads be also permitted:

a) In place of M 20 x 1.50, M 19 x 1.25 having major diameter 19 m&, minimum diameter 16.911/16.646 ‘and pitch. diameter.18.368/18.188; and

b) In place of M 27 x 1.50, M 27 x 1.25 with major diameter 24.911/24.646 and pitch diameter 26.368/26.188.'

(Page 5, Fig. 1, matter with '*' mark) - Substitute the following:

'*For frangible - applicable to all capacities.'

(Page 6, clause 5.1, informal table, second coi heading) - Substitute 'Quantity' 'Quality', -

(Page 6, clause 6.2, line 2) - Substitute 'hydraulic' for 'proof',

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(Page 7, clause 6.4_, line 3) - Delete the word 'minimum'~

_-.-_...*. --

Printed at Printograph, New Delhi, Ph : 5726847

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AMENDMENT NO. 2 AUGUST 1938 TO

IS : ‘4947 - 1985 SPECIFICATION FOR-GAS CARTRIDGES FOR USE IN FIRE EXTINGUISHERS

( Second Revision )

[ Page 5, Fig. 1 ( see ah Amendment No. 1 ) ] - Substitute the following for the sub-paras (a) and (b):

a) Maj& dia 26’80 f ‘20, Pitch 1’27, included angle 55”.

b) Major dia 18’60 f z:!$ Pitch 1’81, included angle 55”.

( Page 5, Fig. 1 ) - For the dimension 8’5 min, substitute 8’5 + 0’5. ( Page 5, Fig. 1 > - Add the following Note:

‘Er’OTE

edge.’ - Sealing disc shall be ‘at a depth of 11 + 0.5 mm from peripherial

[ Page 7, cZause.6.4 ( see also Amendment No. 1 ) ] - Substitute the following for the existing clause :

‘6.4 The sealing device shall be so designed.that the gas carrtridge shall not discharge the content if the temperature inside the gas cartridge reaches up to 75°C.

(BDC22)

.P&ted at Printograph, New Delhi (INDIAl.

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AMENDMENT NO. 3 SEPTEMBER 2003TO

IS 4947:1985 SPECIFICATION FOR GAS CARTRIDGEFOR USE IN FIRE EXTINGUISHERS

( Second Reviswn )

( Page 4, clause 4.1 ) — Insert the following new clause after 4.1:

‘4.2 Mixture of epoxy resin and hardener may be used as an alternative tobrazing while fixing brass nut to the body of cartridge.’

{ Page 7, clause 7.1 ( see also Amendment No. 5 ) ] — Insert the foIlowingat the end of clause::

‘Local thickness of the coating may also be measured by employing otherncm-destructi ve techniques like use of alcometer which is based on the principleof magnetic method as given in IS 3023:1982 ‘Methods of testing local thicknessof electroplated coatings’.

[ Page 7, clause 7.1 ( see also Amendment No. 4 ) ] — Insert the followingnew clause after 7.1:

‘7.2 Epoxy polyester powder coating of 50 microns thickness maybe applied onexternal surface of gas cartridge.’

( CED 22 )

Reprography Unit, BIS, New Delhi, India

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.I ..,. _. ..-..... ..I. . . . . . . _ ..,..,. . . ., . . ._

AMENDMENT NO. 4 OCTOBER 1993 TO

IS 4947 : 1985 SPECIFICATION FOR GAS CARTRIDGES FOR USE IN, FIRE EXTINGUISHERS

(Second Revision)

[ Page 6, clause 6.2 ( see a/30 Amendtnerll No. 1 ) ] - Rcplncc the first ’ sentence by the followlng:

‘In case of ultimate failure test, It shall be tested in a well protcctcd test rig, subjected to lnlcrnal hydraulic pressure equal lo-650 bars for seamless as well as welded body (see 4.1 ),’

(Page 6, clause 6.3 ) - D+zte the words ‘Internal or’.

[ Page 7, clause 6.4 ( see also ~mendrrtenr No. 1 ) ] -- Spbstitute the following for the existing clause:

. ‘Gas cartridge shall bc conditioned for half an hour at 75’C so that inside tcmpcraturc also reaches this level. The gas cartridge shall not discharge the contents at this temperature.

(Page 7 ) - Add a new cl’ausc 7.2:

‘7.2 In ,addition to anti-corrosive treatment as metnloncd in 7.1, the outside surface shall bc given a suitable$mtcctivc coating.’

(CED22) Printed at Printopph, NOW i&i, I’h : 572GR47

.

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AMENDMENT NO. 5 SEPTEMBER 1999 TO

IS 4947 : 1985 SPECIFICATION FOR GAS CARTRIDGES FOR USE IN FIRE EXTINGUISHERS

(Second Revision)

[ Page 5, Fig. 1 ( see also Note in Amendment No. 2 ) ] -Substitute ‘12 * 0.5 mm’ fOt ‘ 11 + 0.5 mm’.

( Page 6, clause 6.1) - Substitute ‘250 kg&m*’ for ‘250 bar’.

[ Page 6: clause 6.2 ( see also Amendmenr No. 4 ) ] - Substitute ‘656 kgf/cm2’ for ‘650 bar’.

(Page 7, clause 7.1) - Insert the following at the end of clause:

‘LAXA thickness of the coating shall be measured by microscopic method prescribed in IS 3203 : 1982*. Epoxy powder~coating of SO-micron thickness may be applied on external surface of the body as an alternative io lead-tin alloy coating.’ I

( Page 7, footnote ) - Insert the following footnote:

~cth0d.S of lesling 104 thickness of elecWopMed coatings (first ret&ion )‘.

(CED22)

Reprography Unit, BIS, New Delhi, India

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AMENDMENT NO. 6 JANUARY 2001TO

IS 4947:1985 SPECIFICATION FOR GASCARTRIDGES FOR USE IN FIRE EXTINGUISHERS

( Second Reviswn )

(Page 8, Table 1 ) — Insert the following Note under Table 1:

‘NOTE — The sampling procedure for lot sizes more than 300 No. shall be in aecordattee

with IS 2500( Part 1 ) :1992 ‘Sampling inspection procedures: Part 1 Attribute sampling

plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (secondrevision).’

( CED 22 )Reprography Unit, 91S, New Delhi, India

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?-’

AMENDMENT NO. 7 SEPTEMBER 2002TO

IS 4947:1985 SPECIFICATION FOR GAS CARTRIDGESFOR USE IN FIRE EXTINGUISHERS

( Second Reviswn )

[ Page 6, clause 5.1, informal table ( see also Amendment No. 1 ) ] — Insertthe following at the appropriate place:

+10’250 gms: 250 _ () gins’

[ Page 6, clause 6.2 ( see also Amendments No., 1,2 and 4 )] — Substitutethe following for the existing:

‘6.2 In case of ultimate failure test, it shall be tested in a well rotected test rig,?

subjected to internal hydraulic pressure equal to 650 kgf/cm for seamless aswell as welded body.’

( Page 6, clause 6.3 ) — Delete and renumber ‘6.3.1’ as ‘6.3’.

( CED 22 )

Reprography Unit, BIS, New Delhi, India

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