general safety notes for chain slings (grade 50/60)
TRANSCRIPT
General Safety Notes for Chain Slings (Grade 50/60)
Ketten Wälder GmbHChain TechnologyGewerbegebiet 583093 Bad Endorf, GermanyFon +49 (0)80 53-20 29-10Fax +49 (0)80 53-20 [email protected]
Last revised: January 2018
Instructions for safe use and avoidance of danger.Keep this safety note/manufacturer's declaration for the entire utilisation time.
•Applicationisonlyallowedforslingingandliftingloads. •Itistobemadesurethatthesafeworkingloadsindicatedontheattachedtagsarenotexceeded. •Changesinthesafeworkingloadindependenceofthetemperaturetareasfollows:
Usewithintheadmissibletemperaturerangemeansnopermanentreductionofthesafe workingloadsafterreturntoroomtemperature. •Useinacidsandalkalisorapplicationinacidoralkalinevapoursisonlyadmissibleif thematerialisresistanttocorrosion. •Anyself-effectedmodifications,suchasexchangeofcomponents,thermalorgalvanictreatment, willinvalidatetheproductliabilityofKettenWälderGmbH. •Inthecaseofparticularlyendangeringconditions(liftingofpersons;causticsubstances; liquidmetals;etc.),thedegreeofendangermentistobeassessedbyacompetentperson andthesafeworkingloadistobeadjustedaccordingly. •Oncontinuousoperation,i.e.atautomatedproductionlineswithhighworkcyclesandoftenrepeated similarmovementsandwaysoftransportation,ahighdynamicstrain(=>20.000stresscycles)occur. Thereistheriskofdamageoftheproductsduetothehighdynamicstrain.Inthesecasesitisessential toreducethetensioni.e.correspondingtomechanismgroup1BmM3acc.toDINEN818-7byusinga highernominalthicknessorsize.
Priortothefirstapplication,itistobemadesurethat •thechainslingdeliveredisexactlytheonethatwasordered, •thetestcertificatehasbeenprovided, •thechainslingiscompletewithmarkingsandindicationsastothesafeworkingloadand thatthosedataareconsistentwiththetestcertificate, •allthedetailsconcerningthechainslinghavebeenincludedinthecardindex.
Prior to each use the chain has to be visually inspected to check if there is any apparent damage or sign of wear.
•Anyparticularspecificationsregardingtheloadhavetobeobserved. •Beforestartingtheliftingoperation,ithastobemadesurethattheloadisfreely movableandthatitisnotanchoredorfixed. •Themassoftheloadmustbeknown.Ifnot,itcanbetakenfromdocumentsor shallbedeterminedbycalculation. •Thelocationofthecentreofgravityshouldbedeterminedwhenchoosingthesling pointsandshouldmeetthefollowingconditions:
•Toensurethestabilityoftheloadwhenusingmulti-legchainslings,theslingangleßshouldbe>15° andshouldbewithintheindicatedrange.Itmust,however,notexceed60°(seeexampleinFig.1).
1. Choosing the appropriate chain sling:
2. Visual inspection:
3. Handling of the load:
Safety Notes
2
General Safety Notes for CROMOX® Chain Slings (Grade 50/60)
d
chain slings lifting point
tobeperpendicularoverthecentreofgravity
forbothlegstobeoverthecentreofgravity
ifeverpossibletobeevenlydistributedoveraplaneaboutthecentre ofgravityandlocatedoverthecentreofgravity
single-leg
double-leg
3- and 4-leg
-40°C to + 250°C over 250°C to 350°C* over 350°C to 450°C
100 % 75% 50 %W.L.L.
*1.4462max350°Callowed
Safety Notes
3
•Theloadhookforattachingthechainslingshouldbedirectlyoverthecentreofgravity. •Onlyslowmovementsareallowed. •Enoughspaceforliftingprocessmustbeguaranteed. •Workershavetokeepsafetydistance,nocontacttotheload. Explanation of the tag: Frontview2–4legs Rearview1leg
•Pulllooseunloadedchainthroughcircularopeningtodesiredlength. •Hookthechainintothepositionasshowninthephoto.
•Ensurecorrectfitwhileliftingprocess. •Neverloadshortenedloosechainstrand. •Payattentiontoloadpeaksduetoasymmetricweightdistribution. •Chainlegsmustnotbetwistedorknotted. •Whenusingamultiplelegchainslinginaverticalhitch, thehooksmustfaceoutwards.
•Chainlegsmustnotbetwistedorknotted. •Aloadshouldalwaysbeattachedtothehooksaddleandmustneverbeappliedtothetipofahook. •Hooksandsuspensionlinksmustbefreelymovableinordertopreventdeformationduetobendingstress. •Whenusingamultiplelegchainslinginaverticalhitch,thehooksmustfaceoutwards. •Whenusingthechokerhitch,thesafeworkingloadisreducedto80%. •Inordertoavoiddamagetochainsortotheloadwhenusingchokerhitches,itmaybenecessary touseintermediatelayersoredgeprotection.
4. Aplication shortening devices: Warning
5. When applying a load to a sling, the following has to be observed:
Loadactingontheslingleg
Horizontalforce
Thehatchedareashowsanglesof inclinationgreaterthan60°,where slingchainsmustnotbeused.
Fig. 1
d
angle
angle
quantityoflegsquantityoflegs
CE declaration
angle
chain diameter
EWL if applicable
WLL
grade
grade
chain diameterdate
EWL if applicable
WLLWLL
Ketten Wälder
SNnumber
angle
angle
quantityoflegs
CE declaration
angle
EWL if applicable
WLL
grade grade
chain diameterdate
EWL if applicable
quantityoflegs
chain diameter
Ketten Wälder
SNnumber
WLL WLL
•Inordertoavoidthataloadswingsinadangerousmanner,itisrecommendedtouseaholdingrope. •Donotshock-loadchainslingsorjerkloads. •Inindicatingthesafeworkingload,itisassumedthattheindividuallegsofthechainslingareloaded symmetrically.Symmetricalloadingcanbeassumedifallofthefollowingconditionsaremet: u theloadislessthan80%oftheratedsafeworkingloadand u theangleofinclinationforeachchainlegisnotlessthen15°and u theanglesofinclinationofthechainlegsdonotdeviatebymorethan15°fromeachotherand u theslingattachmentpointsfor3-and4-leggedchainslingsarelocatedinasling planeofnotmorethan15°. •Forunsymmetricalloading,theclassificationoftheliftingoperationaswellasthedetermination ofthesafeworkingloadistobeentrustedtoacompetentperson.Alternativelyinthecaseof unsymmetricalloading,thesafeworkingloadshouldbereducedto50%oftheratedvalue. •Whenusingmulti-leggedchainslings,thefollowingistobeobservedifnotallofthelegs arerequiredforlifting: u Individuallegswhicharenotbeingusedshouldbehookedbackontothemasterlink. u Insuchcases,thefollowingloadfactorsapply:
•Allinfluencingfactorsaretobetakenintoaccountwhendeterminingaslingtypeandchoosing theappropriatechainsling,withthesafeworkingloadtobegreaterthantheloadtobelifted. •Safetyduringliftingoperations: u ISO12480 -1istobeobservedintheplanningandcarryingoutofliftingoperations. u Handsandotherbodypartsaretobekeptclearwhentauteningthechainsling. u Nootherpersonsmustbeputindanger.
•Theplacewheretheloadistobeputdownshouldbepreparedandmadesufficientlyaccessible. •Thegroundmusthavesufficientload-bearingcapacity. •Itmaybenecessarytostabilisetheloadbyusingwoodenblocksorthelike. •Inordertopreventdamage,theslingchainmustnotbewedged,norpulledoutbymeansoftheliftinggear. •Storageofchainslingsthatarenotinuse: u Inordertominimisecorrosionattacksonchainslingsthathavebeenusedinacidsoralkalis orinacidoralkalinevapours,thosechainslingsshouldbecleanedthoroughlyalsobeforeremoving themfromoperationtemporarily. u Chainslingsshouldbestoredonspeciallydesignedandprovidedracks. Ifchainslingsarelyingonthefloor,thereisariskthattheymightgetdamaged. u Chainslingsremainingonthecranehookshouldbehookedbackontothemasterlink. u Ifchainslingsarenottobeusedintheforeseeablefuture,theyaretobecleanedandprotectedagainstcorrosion.
Inspectionsshouldbeperformedbyacompetentpersonatintervalsofnomorethan12months.Ifnecessary,theseintervalsshouldbeshortenedindependenceofthecircumstancesofuse. •Priortoinspection,thechainslingsaretobecleanedthoroughly. •Anycleaningmethodthatdoesnotattackthebasicmaterialisadmissible,whereasany processesorproceduresthatmaycausehydrogenembrittlement,overheatingormaterialabrasion orwhichmayhidesurfacedamagearetobeavoided. •Sufficientlightingistobeprovidedduringinspections,andallcomponentsofthechainsling are to be examined. •Bymeansofvisualinspections,thechainslingsaretobecheckedforunmistakable identification(tags)aswellasforanyvisuallynoticeabledefects.
If any of the following defects are found, the chain sling has to be removed from operation and inspected by a competent person or serviced/repaired: u Marking/identificationillegibleormissing. u Deformationofsuspensionorslingparts. u Inadmissibleelongationofchainlinks,differencesinleglengths.
6. When putting the load down, the following is to be observed:
7. Maintenance:
Safety Notes
4
d
Type of chain sling Number of Factor to be applied with individual legs used respect to the rated SWL
1 1/2 2 2/3 1 1/3
2- leged3- and 4 - legged3- and 4 - legged
Safety Notes
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d1 + d2 =<0,9xdn 2
Fig. 2
u If,asaresultofwearandtear,thenominalthicknessofachainlinkis<90%(seeFigure2).
u Damage(cuts,notches,grooves,cracks,discolorationduetoheat,excessivecorrosion, bentortwistedlinks,orotherdefects). u Signsofwidening(excessivethroatopening)ordeformationofhooks. Thewideningmustnotexceed10%ofthenominalmeasure;ifhookswithsafetycatchareused, thecatchmustnotbecomedisengaged. •Inspectionsaretoberecordedandprovedinwriting.
•EachindividualpartofthechainslinghastomeettherequirementsofDIN5687, DIN5688Part1andDIN7541. •Individualchainlinksarenottobereplaced-replacecompletelegsinstead. •Anyindividualpartswhicharebroken,noticeablydeformed,seriouslycorroded,orshow depositswhichcannotberemoved,aretobediscardedorreplaced. •Minornotchesorfurrowsinpartsofchainslingsmaybeevenedoutiftheremainingmaterialthickness inthispointis>90%ofthenominalthicknessandnosuddencross-sectionalchangeisnoticeable. •Weldedchainslingsmayonlyberepairedbythemanufacturer. •Ifweldingoperationshavebeenperformedonchainslings,eachindividuallegwhichhas beenrepairedhastobetestedsubsequentlywithtwicetheSWLvalue. •Replacementofmechanicalconnectionlinksrequiresnoloadtestingiftheindividualparttestingis certified.
u CELabelforcompletelyassembledchains. u ThelabelguaranteesthatthetechnicalrequirementsoftheECguidelinehavebeenmet.
It is prohibited to assemble chains and components of different grades.
d
8. When performing maintenance work, the following is to be observed:
Warning: