IS 11928-1 and 2 (1987): Roundslings Made of Man-made Fibres … · 2018. 11. 15. · IS I 11928( Part t )• 1981 2.8 Representative Sling - Aroundsling representative of a production

Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 11928-1 and 2 (1987): Roundslings Made of Man-madeFibres for General Service - Parts 1 and 2 [TXD 9: Cordage]

IS I 11928 ( Part. 1 aad 2 ) • Itl1

Indian Standard

SPECIFICATION FORROUNDSLINGS MADE OF MAN-MADE FIBRES

FOR GENERAL SERVICE, PARTS 1 AND 2

Cordage Sectional Committee, TDC 14

Mini.lry of Defence ( R&D)

&/WlllrIlill,Garware Wall Ropea LId, Bombay

c__

5JUU R. M. TaL"'!iO

M....6"s5.BI K . N. R .......CB......Da ...N ( Aim""" to

5hri R . M. Telang )SaRI A. T. 8&11.... Directorate General of SuppU. I: Diapolab

( IDipection Wing ), New DelhiCoL A. K . BB...TTACHARYA Calcutta Port Trult, Calcutta

5.BI 5. K . MUICBBuHa ( AIlnll." )5alll D. K. Dun... OIBce of the Jute Commluiooer, CalcuttaSIDU G. D. GA!i.1ICHA!iB Neomer Limited, VadodaraSimi T. N. GRABau Mini.try of Defence (DPIN)

SURI A. MUJl:HIW.1SB ( Allnll41. )Sum A. GHOl:lB National Tral HOUle, CalcuttaSimi SIfJtflAn G URA Eakap. (India) Privale Limited, Calculfa

SURI N. B. SB!(QUPTA (All"'''''')5_1 M K . .JaUIfJIIUNWAL" Shalimar Rope Work! Lld,Calcutla

SUAt A. K . SAIIA ( AI,n""',)S.BJ TAIdB S. M. KHAlfDAJ' M . M. Tayebal1y, Calicut

5.BI Sa ...BBIR S. M. Ku .U'Dur ( AIuruU)C ...rr 5. B. KU;lIDUOI ShippiDi Corporation of India Ltd, BombayS_I B. MA.1UlIDaR Export IDJpection Agency, Calcutta

S.al G. MITRA ( AlJ",..t. )5..1 A. C. MAT.U.

S"I 5 . C GUPTA ( .-41tn1l.'. )5.RI R. K. MBIlRA MiniJtry of Defence (DGI )

5.81 S. P. CaAICRAB(lRTY ( .,",-MII)5.81 K. N. Mis.... GUjarat Filamenta Ltd, Vadodara

SaM V. M. S"'TIC.~I.I ( Al,nuu)D. U. MUCBOPADBYAY" Indian Jute IndUitrie.' Research AJJocialion,

Calcutta5.BI S. K. 8os& ( .-4ltn/l4h )

( C...tillJl«l011 ~I' 2 )

C~ 1987BUREAU OF INDIAN STANDARDS

Thlt publication is protected under the lrulia CoPJrilht Ad (XIV or 1957 ) andreproduccioa in whole or in part by aoy meaDS except with written permiaion of thepublisher thall be deemed to be an infringement or copyrigbt under the aid Act.

IS J 11928 ( Part. I aad 2 ) • 1981

( C."tilrwdI''''' /HI" I

M,,,,b,,J R#!",J_inlSSRI G. N. PRABnu Coir Board. Ernakulam

SRRI V. ABnUL MAJEED (AI",,..II)SURI Y. K. RAM .. RAil Rail tndia Technical and Economic Service. Ltd.

New DelhiSRnt P. R. MALLICK ( AI"'1I411)

C.u-r B. R . RAO The Scindia Sturn Navigation Co Ltd . BombayRarauII:NT,lTtVE The Ganle. Rope Co Ltd. HowrabRIU'BUENT,lTlVB Reaearch De.ign. and Standard. Organization.

Railway., LucknowSanr NIR.AL K. SO.A.. I Indian Rope Manufacturen' AAociation.

CalcuttaSIIRI T . BU...TTACHARY.t. ( AI/InIfi,)

SUBI H. C. T ""<ltJ'''' Naval Headquarters, Miniatry of Defence.New Delhi

SURI R. V,8RVA.. ATII ( AIUruJ')SUBI K .....TILALG . TS.t. ....w.t.L,l M. Belt Collon Rope Manufacturing Co. Bombay

SSRI MADHUIANT G . TIIAIIAWALA (AI~)SHIll R. I. MIDSA, Director General. BIS (EJt·ttfftM MftrlHr)

Director ( Tn: )s-r,1cry

SSRI A. R. BAJruJUJoint Uirector ( Tf'x ). BIS

2

18 I 11928 ( Part. J aDd 2 ) - J987

Indian StandardSPECIFICATION FOR

ROUNDSLINGS MADE OF MAN-MADE FIBRESFOR GENERAL SERVICE, PARTS 1 AND 2

O. FOREWORD

0.1 These Indian Standards (Parts I and 2) were adopted by the IndianStandards Institution on 4- February 1987, after the draft finalized by theCordage Sectional Committee had been approved by the Textile DivisionCouncil.

0:2 Due to the considerable we of roundslings made of man-made fibrefor lifting goods, formulation of a standard covering the construction andperformance requirements for roundslings is ot' utmost importance fromsafety point of view.

0.3 Part I of this standard covers terminology and general requirementsof roundsl ings, whereas, Part 2 coven the modes of assembly of slings andthe mode factors to be used with each, together with related maximumsafe working loads.

O.f For the purpose of deciding whether a particular requirement of thisstandard is complied with. the final value, observed or calculated, express­ing the result of a test or analysis, shall be rounded off in accordance withIS: 2-1960·, The number of significant places retained in the rounded offvalue should be the same as that of the specified value in this standard.

·Ruln for roundiog off numerical values ( TwOld ).

3

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.t::o(l)

-B~.-

is I lim ( Part i ) - 1981 ·

Indian StandardSPECIFICATION FOR

ROUNDSLINGS MADE OF MAN-MADE FIBRESFOR GENERAL SERVICE

PART t GENERAL REQUIREMENTS

1. SCOPE

1.1 The Part I of this standard specifies the terminology basic, character­istics of roundslings made from polyamide (nylon), polyester or poly­propylene fibres, used for lifting loads, and the tests and procedures neededto verify these characteristics. In addition. this part of the standard alsospecifies the identification and marking of these slings al well as the meansof recording their characteristics. It also specifies a test for verifying theworking load limit chosen. The term 'lifting' as used in this standardincludes the operations of lowering and suspending. •

2. TERMINOLOGY2.1 For the purpose of this standard the definition as given in IS : 3871­19M· together with the following shall apply.

2.2 SliDg - A flexible device for connecting the lifting appliance andthe load.2.3 SliDS iD B.ale Co.figuration - A roundsling as illustrated inFig. I.2." SliDg A..embly - One or more roundslings in the form used.

NOTa - This ma y be tbe same as tbe sling in wic configuration, ·or anotbermode of assembly ( J"Part 2 ). A sling aaembly is sometimes referred to •• asling.

2.5 ROUlld.UDg - A sling comprising a core enclosed in a protectiveouter cover.

2.6 Core - A hank of yarn comprising the load bearing part of a round­sling .2.7 Protecd~e Outer Cover - A cover enclosing the core typicallycomprising seamed or seamless woven tube or tubes. The protectiveouter cover shall have no load bearing function.

·Gloaary ofterml relating to fibre ropes and cordages (firs' rlDision ).

IS I 11928( Part t ) • 1981

2.8 Representative Sling - A roundsling representative of a productionrun or batch of roundslings of the 53JTl(: type, that is, having a protectiveouter cover of the same material, enclosing a core of the same materialand number of turns of yarn, but not necessarily of the same length( Itt 4.2.3 ).

,I,II

II

II

II

WORKING LOADLIMIT

Flo. I Romu;sLlSG IN BASIC CoNFIGURATION

2.9 CoapUag ColDpoDeDt- A metal fitting attached to a roundsling forconnecting an end fitting.

2.10 End FlttiDg - A metal fitting attached to a roundsling in the courseof manufacture or by means of a coupling component that connects thesling and the load.

NOTll -A roundsl ing and the load may be connected without an end fitting.

2.11 Protective Sleeve - An additional sleeve fitted to a roundsling toprovide extra protection for part of its length but having no effect on thestrength of the sling.

2.12 Effective Leagth - The distance between the bearing points of thesling stretched out by hand ( without noticeable tension ) on a flat surface( set Fig. 2 ).

6

IS I 11928 ( Part I ) - 1987

2.13 StrUlJth of. R01UldsliDl - The maximum mass ( or force) thatthe roundsling can sustain ( or withstand) when tested in the form of arepresentative sling, that is, complete with coupling components and endfittings ( if any ).

FIG. 2 E'PPBc'nvE LENGTH OPSUNO

2.'" Safety Factor - The ratio of strength to the working load limit.

2.15 WoridDI Load Umit (WLL) -The maximum mass that a round­sling in basic configuration is permitted to sustain vertically ( s', Fig. I).

2.16 Mode Factor (M) - The factor that takes into account thegeometry of the sling assembly, the multiplicity of parts, and empiricallydetermined constants.

NOT. - Each mode of slinging is defined bi a figure and a mode factor (SII

Part 2 ) which are used to calculate the safe working load from the working loadlimit ( SN Part 2 ).

2.11 Safe WoridDI Load (SWL) - The maximum mass that thefinished roundsling or sling assembly may raise, lower or suspend. The safeworking load is equal to the product of working load limit and the modefactor ( se« Part 2 ) . Roundslings shall be used only under conditionswhere their marked ( SII 3.2.5 ) safe working load applies.

2.18 Strength Teat - A test that confirms the strength of the roundsling,the coupling components and the end fittings if used.

2.19 Proof Force - The force to which coupling components and endfittings if used are submitted in order to prove their qualities.

NOTE - The proof force i. equivalent to tbe product of tbe working load limitand a test factor of 2.

2.20 Proof Load - The mass equivalent to the proof force ( se« 2.}9 ).

7

IS z 11928 ( Part 1 ) - 1987

3. BASIC CHARACTERISTICS

'.1 Core

3.1.1 Maurials - The core shall consist of yarns of one of the following:

Polyamide ( nylon)

Polyester

Polypropylene

NOTE- The reo.i.lance of man-made fibre. to chemical, microbiological aDdphy.ical allack i. described in Appendix A a' an aid 10 the selecuon of malerial Cora parricular use.

3.1.2 Construction - To form the core, one or more yarns are woundtogether in a plurality of turns and joined to form a hank. The core shallbe uniformly wound to ensure even distribution of the load. There shall beno joint in any yarn except at the finishing point.

3.2 Protective Oater Cover

3.2.1 Ala/erial - The material of the cover shall be homogeneous andthe same as the material of the core and it shall be one of the materialsspecified in 3.1.1. Woven materials shall be uniform and free from anysignificant defects,

3.2.2 Conslrueholl - A fabric outer cover shall be made from one lengthand the ends shall be overtapped and sewn. The ends shall not be suchthat they can be 'unpicked' if one of the yarns breaks. Welding of a fabriccover is not permitted.

3.2.2.1 For the purpose of 3.6 and 3.7 the protective cover shall haveno load bearing function.

3.2.3 Sewing - A thread of the same material as the cover and the coreshall be used and the seams made on a machine with a lock stitch.

NeT. - Tn facilitate inspecliou the .titching thread may be of a differeDtcolour Crom that oCthe cover.

3.2.4 Dimensions - The dimensions of the cover shan accommodateextension and spreading of the core under load.

8

IS I U928 ( .Part J ) • 1987

3.2.5 GaloUT Goding - Roundslings shan have a protective outer cover ofa colour which identifies their working load limit ( WLL ) according tothe following code.

NO'Q - Working load limit ia equal to the safe working load in straight pullof tbe aling in basic configuration.

WLL Coins-(f)

1 Violet

2 Green3 Yellow4 Orange5 Red6 Brown8 Blue

12 Grey

3.2.6 Olher Treatments - Treatments shall be applied before the -coveris fitted to the core. Such treatments may be impregnation, or completecovering with a flexible coating to improve its resistance to abrasion.

3.3 CoupliDg CompoDent.

3.3.1 Mate7ial - Coupling components shall be of metal, but not castiron and they shall be shock resistant. They shall have a breaking load ofat least four times the working load limit of the roundsling, The seatingof the coupling component where the sling engages during lifting shall beso designed as to allow the sling to adopt a natural (flattened) formunder load and shall be finished with no sharp edges•

.NOTa- Coupling components sbould have good resistance to correelon, agdng,fatigue and mechanical Urns within a temperature rauge from -4O·C to +80·C.

3.t.l Malnial - End fittings shall be of metal, but not of cast iron.They shall be shock resistant. They shall have a breaking load of at leastfour times the working load limit of the roundsling. If directly connectedto a roundsling, the part of the end fitting where the roundsling engagesshall be finished with no sharp edges and so designed as to allow the slingto adopt a natural ( flattened) form under load. .

NOD - End fittiogs should have good resistance to corrosion agdng fatigueand mechanical stresses within a temperature range from -~O DC to +80.C.

9

IS • 11928 ( I'art 1 ) • 1981

3.5 Proof Te.tlng of CoapUlig Compollent.and Ead Fitdllg.Coupling components and end fittings shall be proof tested in accordancewith 4.3 and shall be free from permanent deformation, cracks, flaws orother defects when examined after testing.

NOT. - Proof.telting is preferably carried out before attachment to the round.sling.

3.6 WorldDg Load -Limit - The working load limit for each roundslingin basic configuration ( see Fig. 1 ) shall be verified by use of the strengthtest given in 4.2.

3.7 Safe Working Load - The safe working load for a roundsling orsling assembly shall be the product of the working load limit of the round­sling in basic configuration and the mode factor as specified in Part 2 ofthis standard.

3.8 Safety Factor - The minimum value for the safety factor. as defin­ed in 2.14 shall be 6 for the roundsling and 4- for the coupling componentsand end fittings.

4. TEST METHOD

4.1 Atmospheric: CoDdition (or COlldltiomag aDd Tesdag - Thetests shall normally be carried out under prevailing atmospheric condi­tions. In all cases of dispute, however, tests shall be carried out on sampleswhich have been conditioned for 24 hours in an atmosphere of 65 ± 2percent relative humidity and 27 ± 2°e temperature (Stl IS: 6359­1971· ). Where practicable, tests shall be made in the standard cond ition­ing atmosphere otherwise they shall be made as quickly as possible but notexceeding IS minutes of removal of the test pieces from the conditioningatmosphere.

4."2 Streagth Te.t

4.2.1 Principle - A representative roundsling ( without coupling compo­nent and end fitting), a coupling component, a coupling component andend fitting or an end fitting is submitted to a load equal to at least theproduct of the working load limit and the safety factor in accordancewith 3.8.

4.2.2 Apparatus

4.2.2.1 A tensile testing machine of appropriate capacity with cons­tant rate of traverse of straining head not exceeding 250 mm per minuteand with a maximum scale reading not greater than ten times the testforce.

-Methods for condit ioning of textile•.

10

1$ : 11928( Part t ) • 198'

4.2.3 Selection qf Roundslings Specimens - The first manufactured round­sling of each material and working load limit shall be the first test speci­men and further test specimen. of the same type shall be selected atintervals of at least 250 sliOl~s manufactured. If the roundslings asmanufactured are of a length unsuitable for testing' on available equip­ment, test specimens identical except for length shall be made. A lengthof the cover shall be left open in order to permit examination of the coreto establish that it is the same as in the production batch. The ends of thecover where they are abutted shall not be joined so that the cover shall notbecome load-bearing during the test on this representative sling. Thisalso permits examination of the core.

NOTB - 10 cases where rOllodsliogs are produced with coupling componentland eods fittings having a strength Iell than the product of the working load limitand the safety factor for the rouodsling, the specimen should he telted without thecoupliog component aod the eod fitting, if provided.

4.2.4 Test Procedure - Place a roundsling specimen; straight and with­out twist in the test machine using a boIlar.d or pin to attach it; of at least18 mm diameter for roundslings of strength up to 20 tonne and at least35 mm diameter for roundslings of larger strength. For a roundsling,apply the force so that the extension of the roundsling takes place at aconstant rate not exceeding 250 mm per minute. Secure a specimen of acoupling component, a coupling component and an end fitting or an endfitting in the test machine. Submit the specimen to a test force as describ­ed in 4.2.1.

4.2.5 Results - If the test force specified in 4.2.1 is reached withoutfailure the specimen shall be satisfactory.

4.3 Proof Test of CoupliDg Components and End Fittings

4.3.1 Apparatus

4.3.1.1 A tensile testing machine as described in 4.2.2.1.

4.3.2 Procedure - Subject specimen to a force equivalent to twice itssafe working load and examine for freedom from ~~fects.

5. PACKING

5.1 Unless otherwise specified, roundslings shall be packed in accordancewith the requirements laid down in IS : 3256-1980*.

·Code for inland packagiog of ropes and cordagel (first "visio. ).

11

18 I 11928 ( Part t ) • 1981

6. MARKING

6.1 Each roundsling shall have a labelsecurely attached to it on which thefollowing shall be marked:

a) Identification mark or number;b) Manufacturer's name or trade-mark;c) Material of the roundsling, for example, polyester;d) Safe working load in basic configuration; ande) Month and year of manufacture.

6.1.1 Each roundsling may also be marked with other information suchas effective .Iengrh, circumference .and safe working loads for various modesof use.

6.1.2 The material of the roundsling may be identified additionally bythe colour of the label itself. The following label colour shall be reservedexclusively for this use:

Polyamide ( nylon) = GreenPolyester BluePolypropylene Brown

6.1.3 Coupling components and end fittings shall be individuallymarked or numbered so as to identify them with the test report referredto in 7.3.

6.1.4 Each roundsling may also be marked with the Standard Mark.NOTE - The Use of the Standard Mark is Ifoverned by the provi.ioQJ of the

Bureau of Indian Standards Act 1986, and the Rule. and RegulatioQJ made there­under. The Standard Mark on products covered by an Indian Standard conveysthe ... surance that they have been produced to comply with the requirement. ofthat standard under a well-defined Iy.tem of inapectiOD, teating and quality controlwhich is devised and supervised by BIS and operated by the producer. BIS markedproducts are also continuou;ly checked by BIS for conformity to that standard ...further aaft'guard. Detail. of conditioDl, UDder which. licence for the 11Ie of the.Standard Mark may be granted to manufacturen or producen, may be obtainedfrom the Bureau of Indian StllDd.rda.

7. DESIGNATION STATEMENT OF CONFORMITY AND-INFOR M AT ION TO BE SUPPLIED WITH ENQ.UIRY ORORDER

7.1 Designation - The following information shall comprise the fulldesignation of a roundsling in accordance with this Indian Standard andis required when making an enquiry or placing an order:

a) the expression 'ROUNDSLING;b) the effective length or circumference ( see 2.12);

12

IS I 11928 ( Part 1 ) • 1987

c) constituent materials of the roundsling and end fittings (SII3.1.1, 3.2.1, 3.3.1 and 3.4.1 );

d) safe working load ( see 2.17 );e) required safety factor (SII 2.14 ) if it is other than the minimum

specified in 3.8; andf) further treatment given, if any.

7.2 Statement or Conformity - The supplier shall submit to thebuyer, upon request, a statement of conformity, dated, signed and certify­ing that the items detailed thereon have been inspected and tested andcomply in all respects with the requirements of this Indian Standard,alongwith the following information:

a) Name and address of supplier,b) Identification mark or number of roundsling, andc) Designation of the roundsling (see 7.1 ).

When a transaction concerns a batch of roundsJings of the same designa­tion the supplier shall submit only one overall statement.

7.3 Test Report for End Fittings - If the roundsling is fitted withcoupling components and end fittings if provided; a report of the proof testand examination carried out in accordance with 4.3 shall be provided.

8. USE, MAINTENANCE AND INSPECTION

8.1 Guidelines for the use, maintenance and inspection of roundslings aregiven in Appendix A.

APPENDIX A( Clause 8.1 )

GUIDELINES FOR USE, MAINTENANCE AND INSPECTION

A-I. USE OF ROUNDSLING AND ITS MAINTENANCE

A-I.I Only roundslings as identified in clause 6 of Part I of this standardshall be used.

A-l.2· Roundslings made from any material are liable to wear and othermechanical damage after a long we and can be weakened sometimes byvarious agencies, such as chemicals, heat, light and weather. Wheneverany such damages are detected in the roundslings the same shall bediscarded immediately.

13

IS : 11928 ( Part I ) - 1987

A-I.3 Mode factor as indicated in Part 2 of this standard shall be observedproperly.

A-I.4 In a choked lift, the angle of the choke should be formednaturally and the same should not be forced.

A-I.S The following precautions shall be ensured during use:

a) That the sling is of adequate strength and length for the loads;b) When moving the sling and load, the same are not dragged;c) Knots are not made in the sling ;d) While lifting, the sling is not twisted;e) Not to use the sling for a load with sharp edges without protective

sleeves, especially on the parts of the roundslings where abrasionor cuts could occur;

f) Not to allow the sling to remain under the load if this could causedamage;

g) Not to drag the sling out from under the load when the load isresting on the sling ;

h) To avoid snatch or shock loading; andj) To ensure that the included angles of a sling assembly at the

point of suspension do not exceed 90' (su Fig. I in Part 2 ).

A-I.6 The lifting should be carried out in such a manner so that the loadis stable and without tilt. If the length of the load is such that severalslings have to be used then suitable equipment should be used so that theslings hang nearly vertically and the effect of the load is as nearly a,possible equally divided between the legs of the slings .

A-I.7 If slings are used to handle chemical, or are wed at high tempera­ture, the manufacturer's instructions should be observed for such uses. Forguidance in the selection of roundslings for such uses the resistance ofmaterials is broadly given in A-I.'.I, A-I.7.2, A-I.7.3 and A-I.7....

A-I.7.1 Polyamide is virtually immune to the effects of alkalis. It isattacked by mineral acids ( a moderate strength acid on a sling becomesprogressively stronger by evaporation ). Users' attention is drawn to theloss of strength of polyamides when wet, which may be of the order of15 percent.

A-I.7.2 Polyester is resistantto mineral acids but is damaged by alkalis .

A-l.7.3 Polypropylene is little affected by acids and alkalis and is suit­able for applications where the highest resistance to chemicals ( other thancertain solvents) is required. Care should be taken to ensure that poly­propylene is adequately stabilized against ultraviolet degradation.

14

IS I 11928( Part t ) . t.'

A-I.7.4 All these fibres are highly resistant to mildew and other micro­biological attacks.

A-I.8 Slings are subject to degradation by ultraviolet light, so these shallbe stored away from sunlight and other sources of ultraviolet radiation.

A-I.9 A sling shall not be stored or dried near a source of heat.

A.J.IO Each sling shall be inspected before every period of use (sel A-2.3).

A-I.ll A damaged sling shall never be repaired and used and if requiredthe advice of the manufacturer or the supplier would be sought.

A-I.12 The slings shall be stored on a suitably designed rack when notin use.

A-2. INSPECTION OF SLINGS FOR DETECTION OF DAMAGE

A-2.l Slings should be examined throughout their length for surfacechafe, cross or longitudinal cuts in the cover, or any damage to thestitching, coupling components or end fittings.

A.2.2 Chemical attack is indicated by local weakening or "Softeningof thematerial in the cover so that surface pieces can be plucked or rubbed off,as a powder in extreme cases. Damage to the core should be assumed inthese cases and the roundsling immediately withdrawn from services.

A-2.3 Cuts in the cover should raise serious doubts as to the integrity ofthe core. A sling so affected should be taken out of service immediately.

IS

.-

IS I lI!na ( Part 2 ) • 1987

Indian Standard

SPECIFICATION FORROUNDSLINGS MADE OF MAN-MADE FIBRES

FOR GENERAL SERVICE

PART 2 MODES OF ASSEMBLY, MODE FACTORS,SAFE WORKING LOADS AND STR~NGTHFOR

ROUNDSLINGS

I. SCOPE

1.1 This Part 2 of the standard specifies the modes of assembly, modefactors, maximum safe working loads and strength for roundslings madeof man-made fibres such as polyamide, polyester, and polypropylene.

2. MODES OF ASSEMBLY AND MODE FACTORS

2.1 The modes of assembly and the mode factors shall be as shown inFig. I.

IfStraight Lift

Mode Factor - 1

8Choked Lift

Mode Factor ... O'S

FlO. 1 MODES OF &SEIIBLY POR ROUNDSl JNC~ - Contd

· 17

..

IS. 11928 ( Part 2) .1981

CBuket Hitch Parallel

Mode Factor - 2

DBasket Hitch, 90'

Mode Factor - I·"

ETwo-Legged Sling, Mu 90'

Mode Fa ctor ~ 1·4

FFour-Legged Sling Mu 90"

Mode Factor = 2

Flo. 1 MaDill 0' AssZMBLY 'OR ROUNDSLJNOI

3. MAXIMUM SAFE WORKING LOADS AND STRENGm

3.1 The safe working loads and strength of roundslings in differentconfigurations up to a working load limit of 12 tons shall be as givenin Table 1.

18

TAaLB 1 un WORKING LOADS AND STRENGTH CORRESPONDING TO WORKING LOAD LIMITS

( Claw, 3.1 )

M. - Mode factor,tt - TOD - I 000 kg,

IkN - 102 kgrapproximately,

L- .

'0

WORKU'O Lo.nL,Il.T woa EAOHSLn.o IN B• • rceolllrIOUK.'l',ON

(I)

1'0

2'0

3'0

4'0

5'0

6'0

S'O

12'0

eoa.apONOIIllOMINUlOIl

Sn.1ll0TH or TDERoullln.Lulo

kN

(2)

58'8

117'7

176'5

235"4

294'2

353'0

470'7

706'1

S.r. WOlllUIllO LOAnB, Mur----- - --- - -------- '"""'----------------..--~

SIrBight Choked Lif. Baskel Hitch 2-Legged +.LellgedLifl M - 0'8 r-- 4 ..... SIiOll, Sliog,

M. - 1'0 Parallel 90· Mu 90· Max 90°M - 2'0 M - 1'4 M _ 1'4 M .,. 2'0

It

(3) (4) (5) (6) (7\ (8)

1'0 0'8 2'0 1'4 1'4 2'0

2'0 1'6 4'0 2'8 2'8 4'0

3'0 2'4 6'0 4'2 4'2 6'0

4'0 3'2 8'0 5'6 5'6 8'0

5'0 4 '0 10'0 7'0 7'0 10'0

6'0 4'8 12'0 8'4 8'4 12'0 -S'O 6'4 16'0 11'2 11'2 16'0 (jDo-12'0 9'6 24'0 16'8 16'8 24'0 -.-

i-~

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INTERNA",ONAL SYSTEM OF Utt'TS ( SI UNITS)

•••• Unite

Quantity Unit Symbol

L.ngth metre mMaaa kilogram kgTime second sElectric current ampere AThermodynamic kelvin K

temperatureluminous Intensity candela cdAmount of substance mole mol

Suppl.ment.ry Unit.Quantity Unit Symbol

Plane angle radian radSolid angle sleradlan .r

D.rlv.d Unit.

Quantity Unit Symbol Ihfln11/011

Force newton N N -1 kg.m/"Energy loul. J J -1 N.m

Power watt W 1 W -1 J/.Flux weber Wb 1 Wb -1 V••Flux density te.la T 1 T -1 Wb/m'Frequency hertz Hz ~ Hz - 1 c/' C.-I,Electric conductance alemen. S 1 S -1 A/VElectromotive force volt V 1 V -1 W/A

Pre••ure, .tr••• pa.caI Pa 1 P. - 1 N/m'