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SCHEMEOF( F i r st Revi si on

ln d ian StandardSYMBOLSFOR

IS : 813 - 1986

WELDINGFirst Reprint APRIL 1992

UDG 621.791-052 : 003.62

@ Cojyight 1988BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002Gr 10 December 1988

( Reaffirmed 1997 )

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IS t 813 - 1986

SCHEMEOFI ndi an St andardSYMBOLSFORWELDING( i rst Revi si on )

Welding General Sectional Committee, SMDC 14Chairman Representing

San1 D. S. HONAVARMembers

D&H Secheron Electrodes Pvt Ltd, Indore

SHRI S. R. JANA ( Atlcrnate toShri D. S. Honavar )SEP.I R. S. AWARWALSHRI J. K. AELUWALIA

SHRI T. K. BASU ( Alternate )SHRI H. N. AHUJ ADR S. BALASUBKAPANIAN

DR S. BHATTACHARYYA ( Allernatc )SHRI K. BALMANOHARSHRI R. V. KALE ( Alternate )SHRI R. BANEBJ EESEIRI S. K. DAS ( Alternate )SHRI S. C. BHAWALSHRI K. L. BARUI ( Alternate )SHRI S. K. BURXANS,xnr B. B. GKOSH ( Alternate )SHBI R. S. CHOUDHURY

Association of Indian Engineering Industry, New DelhiStewarts & Lloyds of India Ltd, CalcuttaDirectorate General of Employment and Training, New DelhiPeico Electronics and Electricals Ltd, BombayHindustan Shipyard Ltd, VisakhapatnamIndian Oxygen Ltd, CalcuttaNational Test House, CalcuttaM. N . Dastur & Co Pvt L td, CalcuttaSteel Authority of India Ltd ( Bokaro Steel Plant ), Bokaro SteelCity

DEPUTY DIBEOTOR ( CHEMI CAL ) RDSO,LUCKNOW Ministry of RailwaysPRODUCTION ENGINEER, INTEQRAL COACHFACTORY, MADRAS ( Alternate )SHRI S. C. DEYSHRI C. R. GHOSE

SHRI D. B. MOHARIL ( Alternate )SHRI I. P. KAPOORSERI L. M. TOLANI (Alternate)Da S. PRA~ANNA KUMARSHBI J. K. NANDA ( Alternate )SHRI S. MAJUMDARSHRI S. K. BHATIA ( Alternate )SHRI R. S. MAL+ICKSHRI N. MUMMOORTEY

SHARIH. S. DUWAL ( Alternate)SEBI J . D. PANDASHRI RAJINDR k NATE ( Alternate I )SHRI S. L. V. RANGAN ( Alternate II )

SHRI K. M. POLESHIU G. D. APTE ( Altcrnafc )SHRI J. R. PRASHERSHRI N. RADHA~XIRHNANSH~XI B. RA~~ASW~MYSHRI S. M. KADAM. ( Alternate )DR V. RAMASWAMY

Central Boilers Board, New DelhiMukand Iron & Steel Works Ltd, BombayDepartment of Atomic Energy, BombayLarsen & Toubro Ltd, BombayDirectorate General of Technical Development, New DelhiGas Authority of India L td, New DelhiEngineer-in-Chiefs Branch, Ministry of DefenceDalmia Institute of Scientific & Industrial Research, Rajgangpur

Walchandnagar I ndustries, WalchandnagarEngineers I ndia Ltd, New DelhiBinny Ltd, MadrasIndian Hume Pipes Co Ltd, PuneSteel Authority of India Ltd ( Research and Development Centre

DR S. K. CROUDHURY ( Alternate )SHRI P. H. MADHAVA REDDYSHRI IM. G. NLEAYANA RAO (Alternate )REPRESENTATIVE

SHEI RAMESI ~ KWB~AR Alternate I )5snr V. SKEXX~XNARAYANA ( Alternnte II )REPRESENTATIVESarlr N. K ROY

for I ron and Steel ), RanchiBharat Heavy P late and Vessels Ltd, VisakhapatnamBharat Heavy Electricals Ltd, Hyderabad

J essop & Co Ltd, CalcuttaProjects 8; Development India Ltd, DhanbadSHI11 P. K. ROY (Alternate )Sax1 S. II. ROY Ministry of Defence ( DGI ) ( Continued on page 2 )

Q Copyright 1988BUREAU OF INDIAN STANDARDSThis publication is protected under the Indian Cogyright Act ( XI V of 1957 ) and production in whole or in part by

any means except with written permission of the publisher shall be deemed to be an infringement of copyrightunder the said Act.

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IS : 813 - 1986( Continued rom page1 )SHRI B. K. SINGESERI A. V. MULEY ( Ahmats I )SHRI P. S. Josar ( Alternote II )SERI V. K. SRIDHARSHRI R. C. SEARMA ( Alfsrnatc )SHRI H. K. TANEJASHRI S. CHANDRA ( Altn&t )SBRI J. R. UPADHYAYSHRI B. S. PATEL ( d~frrnala )SERI N. VI~VANATHANSEIRI P. S. VI~VANATHSHRI K. RAOBAVENDRAN,Director ( Strut & Met)

RcprusunfingTata Engineering and Locomotive Co Ltd, Jamshedpur

Directorate General of Supplies and Disposals, New DelhiIndian Register of Shipping, CalcuttaApar Pvt Ltd, BombayNational Hydroelectric Power Corporation Ltd, New DelhiAdvani Oerlikon Ltd, BombayDirector General, BIS ( Ex-o& i0 Mmnbri )

SUCrUtUrJSHRI S. S. SETHIJoint Director ( Strut & Met ), BIS

Representation and Terminology for Welding and Cutting of Metals Subcommittee, SMDC 14 : 8Conwncr

SHRI Ji R. PI~ASHERMembersDB P. C. GUPTASHBI R. M. JAINDR S. PRASANNA KU~~ARDB R. S. PARYARREPRESENTATIVEREPRESENTATIVEREPRESENTATIVE

Engineers India Ltd, New DelhiUniversity of Roorkee, RoorkeeSpecial Machines, KarnalLarsen & Toubro Ltd, BombayIndian Institute of Technology, New DelhiDirectorate General of Employment and Training, New DelhiKirloskar Electric Co Ltd, BangaloreWelding Research Institute. Tiruchirapalli

2

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IS I 813 - 1986I ndian St andard

SCHEMEOFSYMBOLSFORWELDING( i rst Revi si on0. FOREWORD

0.1 This Indian Standard ( First Revision ) wasadopted by the Indian Standards Institution on24 January 1986, after the draft finalized by theWelding General Sectional Committee had beenapproved by the Structural and Metals DivisionCouncil.0.2 Welding cannot take its proper place as anengineering tool unless suitable means are prove-ded for conveying the information required forwelding from the designers to the operators.The svmbols described in this standard providethe means of placing on drawings the informationconcerning type, size, position, etc, of the weldsin welded joints. With a view to avoid confusionand misunderstanding, it is very essential thatonly, standard symbols are used by all designersand fabricators. However, all information requi-red for welding is not conveyed by the symbolsalone. It is, therefore, often necessary, evenwhen the standard symbols have been used, toindicate on the drawings, reference to standardspecifications for welding procedures and/or

welding procedure sheets giving details of thetools, materials, processes and other requirementsfor welding.0.3 This standard was first published in 1956.Amended version of the standard was issued in1961. It is now being revised to bring it in linewith other international standards published onthe subject.0.4 This standard keeps in view the practicesbeing followed in the country in this field.Assistance has also been derived from the follow-ing standards issued by the International Organi-zation for Standardization ( IS0 ):

1SO 2553-1984 Welds - Symbolic representa-tion on drawingsIS0 4063-1978 Welding, brazing, brazewelding and soldering ofmetals - List of processes, for

symbolic representation ondrawings1. SCOPE1.1 This standard prescribes the rules to beapplied for symbolic representation of welds ondrawings giving information concerning type,size, position, welding process, etc, for welds inwelded joints.

1.1.1 The scheme does not include the use ofthickened lines, hatching and such other meansfor indicating the welds themselves on thedrawings, as it is considered that users will be inthe best position to judge whether such additionsare desirable to meet their particular needs.2. TERMINOLOGY2.1 For the purposes of this standard, the detini-tions given in IS : 812-1957* shall apply.3. GENERAL3.1 Welds may be indicated in accordance withthe ueneral recommendations for technicaldrawi&s. However, for the purpose of simplifi-cation,

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IS : 813 - 19864. SYMBOLS4.1 Elementary Symbols

4.1.1 The various categories of welds arecharacterized by a symbol which, in general, issimilar to the shape of the weld to be made.4.1.2 The symbol shall not be taken to pre-judge the process to be employed. The elemen-tary symbols are shown in Table 1.

4.2 Combination of Elementary Symbols -When required, a combination of elementarysymbols may be used.4.3 Supplementary Symbols

4.3.1 Elementary symbols may be completedby another symbol ( supplementary ) charactcri-zing the shape of the external surface of theweld.

The recommended supplementary symbolsare given in Table 2.NATE - The absence of a supplementary svmbolmeans that the type of the weld surface does not needto be indicated precisely.

4.3.2 Examples of combination of elementaryand supplementary symbols are given in Table 3.NOTE -- Although it is not forbidden to associateother symbols, it is better co represent the weld on aseparate sketch when symbolization becomes too

difficult.

NOTE 2-Type of lines and line thicknesses shouldbe in accordance with IS : 10714-1983..

4.4 Typical examples of the use of elementarysymbols, combination of elementary symbols andcombination of elementary and supplementarysymbols are given in Tables 5, 6 and 7respectively of Appendix A. Typical examplesfor symbols for certain exceptidnal cases are givenin Table 8 of Appendix A.5. POSITION OF SYMBOLS ONDRAWINGS5.1 General

5.1&l Symbols covered in this standard formonly a part of the complete method of. represen-tation ( Fig. 1 ) which comprises in addition,the following:a) an arrow line(l) for each joint ( see Fig. 2and 3 );b) a dual reference line, consisting of twoparallel lines, one continuous and onedashed (2) ( exception, see Note 1 ); andc) a certain number of dimensions and con-

ventional signs.NOTE I - Dashed line can be drawn either aboveor beneath the continuous line ( se. 5.5 and Appen-&A).

5.1.2 The location of welds, therefore, is defi-ned on the drawings by specifying:a) position of the arrow line,b) position of the reference line, andc) the position of the symbol.

5.2 Relation Between Arrow Line and theJoint - The examples given in Figures 2 and 3explain the meaning of the terms:a) arrow side of the joint, andb) other side of the joint.

5.3 Position of Arrow Line -. The position ofthe arrow line with respect to the weld is gene-rally of no special significance [ see Fig. 4(a) and4(b) 1. However, in the case of welds of types 4,6 and 8 ( see Table 1 ), the arrow line shall pointtowards the plate which is prepared [ see Fig.4(c) and 4(d) 1.

The arrow line joins one end of the continu-ous reference line such that it forms an angle withit and shall be completed by an arrow head. Incertain cases, the arrow head may be omitted orreplaced by a dot.5.4 Position of Reference Line - The refe-rence line shall be a straight line preferablydrawn parallel to the bottom edge of thedrawing.5.5 Pkition of Symbol with Regard to theReference Line - The symbol shall be placedeither above or beneath the reference line, inaccordance with the following:

a) The symbol is placed on the continuousline side of the reference line if the weld( weld face ) is on the arrow side of thejoint [ ( see Fig. 5(a) J.b) The symbol is placed on the dashed lineside if the weld ( weld face ) is on the

other side of the joint [ see Fig. 5 (b) 1.6. DIMENSIONING OF WELDS6.1 General

6.1.1 Each weld symbol may be accompaniedby a certain number of dimensions, written asfollows, in accordance with Fig. 6:

a) The main dimensions relative to the cross-section are wrltten on the left-hand side( that means before ) of the symbol.b) Longitudinal dimensionsare written on the

right-hand side ( that means after ) of thesymbol.*General principles of presentation on technicaldrawings.

4

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IS t 813 - 1986TABLE 1 ELEMENTARY SYMBOLS

I Clause 4.1.2 1-SLNo.

-- -

1

DESIGNATION ILLUSTRATION SYMBOL

1 Butt weld between plates with raised edges*,( the raised edges being melted down completely )

2 Square butt weld

3

-

4

Single-V butt weld

Single-bevel butt weld-_

5 Single-V butt weld with broad root face

. -6 Single-bevel butt weld with broad root face

Single-U butt weld ( parallel or sloping sides )

Single-J butt weld

Backing run; back or backing weld

Fillet weld

+welt I tt welds between plates with raised edges ( symbol 1 ) not completely penetrated are symbolized as square but,: symbol 2 ) with the weld thickness, s, as shown in Table 4. ( Continued

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IS : 813 - 1986

11 Plug weld; plug or slot weld/USA/

-

12

-

13

TABLE 1 ELEMENTARY SYMBOLS - Contd

DESIGNATION

Spot weld

Seam weld

ILLUSTRATION SYMBOL

eTABLE 2 SUPPLEMENTARY SYMBOLS

( Clause 4.3.1 )

SHAPE or WELD SURFACE SY3WOL

a) Flat ( usually finished flush )--___

b) Convex

c) Concave;d

6.1.2 The method of indicating the maindimensions is defined in Table 4. The rules forsetting down these dimensions are also givenin this table.

Other dimensions of less importance may be.indicated if necessary.6.2 Dimensions - The dimension that locatesthe weld in relation to the edge of the sheet shallnot appear in the symbolization but on thedrawing.

6.2.1 The absence of any indication followingthe symbol signifies that the weld is to be conti-nuous over the whole length of the workpiece.6.2.2 In the absence of any indication to thecontrary, butt welds shall have complete pene-tration.

6

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ISr813-1986

TABLE 3 EXAMPLES OF APPLICATION OF SUPPLEMENTARY SYMBOLS( Clause 4.3.2 )

DEEXQNATION

Flat ( flush ) single-V butt weld

Convex double-v butt weld

Concavefillet weld

Flat (flush) single-V butt weld with flat ( flush )backing run

ILLUSTRATION SYYBOL

-

Otherside

1 - arrow line2s = reference line (continuous line)2b = identification line (dashed line)3 - welding symbol

FIG. 1 METHOD OF REPRESENTATION

A&w Arrowside side

Otherside

(al Weld cmhe arrow side [b) Weld on the other sideFIG. 2 T-JOINT WITH ONE FILLET WELD

7

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X5:813-1986

Other stde Arrow sideof lolnt A of joint A

Arrow sideof joint 6

aJOther sideof Joint 6

Other sideof joint A

Arrow sideof joint B

Arrow sideof joint A

b)Other sideof joint B

NOTE - The position of the arrow in these sketches is chosen for purposes of clarity. Normally, it would beplaced immediately adjacent to the joint.FIG. 3 CRUCIFORM JOINT WITH Two FILLET WELDS

H-II--I

a) b1

El-I-NOTE - In the case of spot welds made by projection welding, the projection surface is to be considered as theexternal surface of the weld.

FIG. 4 POSITION OF THE ARROW LINE8

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IS : 813 - 1386

For symmetrical welds only

Ja) To be welded on bl To be weldedthe arrow side on the other side

FIG. 5 POSITION OF SYMBOL ACCORDING TO THE REFERENCE LINE

-_./Lii_FIG. 6 EXAMPLES OF THE PRINCIPLE

6.2.3 For the fillet welds, there are twomethods to indicate dimensions ( see Fig. 7 ).Therefore, the letters a or z shall always beplaced in front of the value of the correspondingdimension.

7. COMPLEMENTARY INDICATIONS7.0 Complimentary indications may be necessaryin order to specify some other characteristics ofwelds as given in 7.1,7.2 and 7.3.7.1 Peripheral Welds -When the weld is tobe all around a part, the symbol is a circle, asshown in Fig. 8.7.2 Field or Site Welds - A flag is to be usedto indicate the field or site weld, as shown inFig. 9.7.3 Indication of Welding Process - Ifrequired, the welding process may be symbolizedby a number written between the two branchesof a fork, at the end of the reference line remotefrom the reference line, as shown in Fig. 10.

E$th_ h _ ~ti!?eSS6.2.4 Iii the case of plug or slot welds with 7.3.1 Numerical itidex numbers identifyingbevelled edges, it is the dimension at the bottom each process of welding, brazing, braze weldingof the hole which shall be taken into con- and soldering to be used for symbolic representation

sideration. of welds on drawing are given in Appendix B.9

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TABLE 4 MAIN DIMENSIONS( Clause 6.12 )

T - -InscriptionINo. Designationof welds Definition _

V(Saa.6.2.1 and 6.2.2)

minimum distance from the surface of the partto the bottom of the penetration, w hich cannotbe greater than the thickness of the thinner part.

sS II(Sar6.2.1,Butt weldS Y

L%e6.2.11Butt weldbetween

plateswith raised

edges

S IIISeaS 2.1 and

%omots 10 table 11

s : minimum distance from the external surface ofthe weld to the bottom of the penetration.

I

3Cor+uousfillet weld

a ILo : height of the laqest isosceles triangle that canbe inscribed in the section.Z ILside of Ihe largest isosceles triangle that can be

inscribed in the section.lSo6.2.1 and 6.2.31

I(4naz-

a IL n x 1 e)Z- IL n x 1 (e)

length of weld (without end craters).distance between adjacent weld elements.number of weld elements.(see No. 5;

4 Intermittentfillet weld

1 (See6 2.31I ( ContinuedL L

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TABLE 4 MAIN DIMENSIONS - Contd

width of weld

diameter of hole

l&eNo. 419 Spot weld (el spacing n&9

d diameter of spot

.

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IS : 813 - 1986

a5 300_ - - -/

z=aOFIG. 7 METHODS OF INDICATING DIMENSIONS OR FILLET WELDS

cFIG. 8 INDICATION OF PERIPHERAL WELD FIG. 10 INDICATION OF WELDING PROCESS

FIG. 9 INDICATION OF FIELD OR SITE WELD

APPENDIX A( Ch.ws 4.4 and 5.1.1 )

EXAMPLES OF USE OF SYMBOLSA-l. Typical examples of use of the elementaryand supplementary symbols are given in Tables5 to 8. The representations shown are givensimply for explanation and are not obligatory;

figures given in this Appendix, the relative position ofviews are those provided by the first angle projectionmethod. It should be understood, however, that thirdangle method could equally have been used withoutprejudice to the principle established but as a basicNOTE - For the sake of uniformity among the requirement, use of first angle projection is to befollowed.

12

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V

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._-_TABLE 5 EXAMPLES OF USE OF ELEMENTARY SYMBOLS - Contd

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9

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LI

I

9QI8S

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TABLE 5 EXAMPLES OF USE OF ELEMENTARY SYMBOLS - ContdSIvo

-

22

23

24

OesngnatlonSymbol

(Numbersrefer 10fable 11

Plug weld

11

Spot weld

012

RepresentetlonEl@-

_-__-_Et0a_---a____

&her Or

Symbohzation

_----_VT--~-------_1 --__Fe__-lx+---__lizt-I-+- me

._ ___. ( Continued ),

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5

,TABLE 5 EXAMPLES OF USE OF ELEMENTARY SYMBOLS - Contd

SI Designation Illustration Reproseotation SymbolizationNo. Symbol(Numbers r---lAh

refer totable 11 either I cl1

26

27

Seam welde13

J I

----fJEp!j-- -__c3----___

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TABLE 6 EXAMPLES OF COMBINATIONS OF ELEMENTARY SYMBOLS( Clause 4.4, and Appendix A )

SI Designation wE.tratlon Representation SymbolizationNo. SymbolINumbers

relet to eithertable 11Butt weldbetween

plates withraised edges

1 JUendbacking run-9

1-9, Square

butt weld

II 22 weldedfIOlll

both sides2-2

3 Single-Vbutt weld --_--- __---__V 3 ______~ ___-and __-.

backing runw9

4 3-9

( Canfinucd

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N

TABLE 6 EXAMPLES OF COMBINATI ONS OF ELEMENTARY SYMBOLS - Co&-SI

NC? T.2Sf.jll3ll01,Symbol(Numbers

refer toIable 11

Double Vbutt weldV 3IXweld1

3-3

Doublebevel

b,ltt weld

V 4IKeld14-4

Ii

-_

11m_---_m----_-1ll~l1~lJ~lll~~1l~~~0----_--6 El111~11~1~11l~~1~l1)1)---_--- I d--I

-

8

L-4---_Double-V

,bu!t weldwtth broadroot face

Y5-5

Oouble-bevel

butt weldwth broadroot face

Y 66-6--a------lJwl)lJ~l)mlIn_;---_9

( Continued )

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TABLE 6 EXAMPLES OF COMBINATIONS OF ELEMENTARY SYMBOLS - Contd

SiUO Tllustration Representation=(I$!!&

DesignationSymbol

(Numberrefer totable ?I

Symbolization

either

Doub1e.Ubutt weld El---_))))))))W))))cl----0 7-7Double-Jbtitt weld LJ---__11lllll1lllllltllll0_-----I11 8-8Single-V

butt weldV3and single-Ubutt weld

Y 73-7

)n)N))))m)J)El---__12Fillet weld

and filletweld

IO 10

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TABLE 7 EXAMPLES OF COMBINATI ONS OF ELEMENTARY AND SUPPLEMENTARY SYMBOLS( Clause 4.4, and Appendix A )

( Conrinued )

YUJ. .2W,LP

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TABLE 7 EXAMPLES OF COMBINATI ONS OF ELEMENTARY AND SUPPLEMENTARY SYMBOLS - Contd

Symbolization

z.zwI

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TABLE 8 EXAMPLES OF EXCEPTIONAL CASES - Contdr

not recommended

not recommended

not recommended

Representation Symbolization

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IS:813.1986APPENDIX

( Ctause 7.3.1 )B-l. The various processes and the correspon-ding index numbers for welding, brazing, brazewelding and soldering of metals, for the purposeof symbolic representation of welds on drawingsare as given below:

111

ARC WELDING

111112113114115118

12121122

13131135136

14141149

1518

181185

2

Metal-arc welding without gas protec-tionMetal-arc welding with covered elec-trodeGravity-arc welding with covered elec-trodeBare wire metal-arc weldingFlux cored metal-arc weldingCoated wire metal-arc weldingFirecracker weldingSubmerged-arc weldingSubmerged-arc welding with wire elec-trodeSubmerged-arc welding with strip elec-trodeGas-shielded metal-arc weldingMIG weldingMAC, welding: metal-arc welding withnon-inert gas shieldFlux cored metal-arc welding with non-inert gas shieldGas-shielded welding with non-consum-able electrodeTIG weldingAtomic-hydrogen weldingPlasma-arc weldingOther arc welding processesCarbon-arc weldingRotating-arc weldingRESISTANCE WELDING

21 Spot welding22 Seam welding221 Lap seam welding

225 Seam welding with strip23 Projection welding24 Flash welding25 Resistance butt welding29 Other resistance welding processes

291 HF resistance welding3 G.4S WELDING

31 Oxy-fuel gas welding311 Oxy-acetylene welding

312 Oxy-propane welding313 Oxy-hydrogen welding

32 Air-fuel gas welding321 Air-acetylene welding322 Air-propane welding

4 SOLID PHASE WELDING: PRES-SURE WELDING41 Ultrasonic welding42 Friction welding43 Forge welding44 Welding by high mechanical energy

441 Explosive welding45 Diffusion welding47 Gas pressure welding48 Cold welding

7 OTHER WELDING PROCESSES7172

721722

737475

751752753

767778

781782

Thermit weldingElectroslag weldingElectroslag welding with non-consumablenozzleE lectroslag welding with consumablenozzleElectroslag weldingInduction weldingLight radiation weldingLaser weldingArc image weldingInfra-red weldingElectron beam weldingPercussion weldingStud weldingArc stud weldingResistance stud welding

9 BRAZING, SOLDERING ANDBRAZE WELDING91 Brazing

911 Infra-red brazing912 Flame brazing913 Furnace brazing914 Dip brazing915 Salt bathe brazing916 Induction brazing917 Ultrasonic brazing

B

27

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lS:813-1986918 Resistance brazing919 Diffusion brazing923 Friction brazing924 Vacuum brazing

93 Other brazing processes94 Soldering

941 Infra-red soldering942 Flame soldering943 Furnace soldering944 Dip soldering945 Salt bathe soldering946 Induction soldering

947 Ultrasonic soldering948 Resistance soldering949 Diffusion soldering951 Flow soldering952 Soldering with soldering iron953 Friction soldering954 Vacuum soldering

96 Other soldering processes97 Braze welding

971 Gas braze welding972 Arc braze welding

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Bureau of Indian StandardsBIS is a statutory institution established under the Bureau of I ndian St andards Act , 1986 topromote harmonious development of the activities of standardization, marking and qualitycertification of goods and attending to connected matters in the country.CopyrightBIS has the copyright of all its publications. No part of these publications may be reproducedin any form without the prior permission in writing of BIS. This does not preclude the free use,in the course of implementing the standard, of necessary details, such as symbols and sizes, typeor grade designations. Enquiries relating to copyright be addressed to the Director( Publications ), BIS.Revision of Indian StandardsIndian Standards are reviewed periodically and revised, when necessary and amendments, ifany, are issued from time to time. Users of Indian Standards should ascertain that they are inpossession of the latest amendments or edition. Comments on this Indian Standard may besent to BIS giving the following reference:

Dot : No. SMD 14 (2124)

Amendments Issued Since PublicationAmend No. Date of Issue Text Affected

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