Farr HD8625 - Inspection Of Slings

2.2
hD8625 8-
5
/
8
” 35K Tong
Technical Manual
seTup & operaTion
Minimum Allowable Chain Link Thickness at Any Point
Nominal Chain Size Minimum Thickness
Inches MM Inches MM
7/32 5.5 0.189 4.80
9/32 7 0.239 6.07
5/16 8 0.273 6.93
3/8 10 0.342 8.69
1/2 13 0.443 11.26
5/8 16 0.546 13.87
3/4 20 0.687 17.45
7/8 22 0.750 19.05
1 26 0.887 22.53
1-1/4 32 1.091 27.71
Refer To ASME B30.9
1. Inspection Of Slings
McCoy Drilling & Completions strongly recommends the following practices:
Acompleteinspectionofnewload-bearingdevicesandattachmentsshallbeperformedbyaqualified,designatedpersonpriorto
initialuse.Eachlinkandcomponentshallbeexaminedindividually,takingcaretoexposeandexamineallsurfacesincludingtheinner
linksurface.Theslingshallbeexaminedforconditionssuchasthoselistedintheremovalcriteriabelow.Inaddition,dailyinspection
ofslings,fasteningsandattachmentsshallbeperformedbyadesignatedperson.Ifdamageordefectsarefoundateitherinspection,
thedamagedordefectivecomponentshallbequarantinedfromserviceuntilitcanbeproperlyrepairedorreplaced.
RemovalCriteria:
Aload-bearingdeviceshallberemovedfromserviceifconditionssuchasthefollowingarepresent:
• Missingorillegibleslingidentification.
• Cracksorbreaks
• Evidenceoftamperingisseen-slingtaghasbeenmodifiedorobscured,ortamper-proofnutsaremissing.
• Signsofimpactonload-bearingcomponents,includingspreaderbars,liftinglugs,rigidslings&rigidslingweldments,andlegs&
legmounts.
• Brokenordamagedwelds.
• Excessivewear,nicks,orgouges.Refertothechartbelowtoensureminimumthicknessonchainlinkssuppliedisnotbebelow
thevalueslisted:
• Stretched,bent,twisted,ordeformedchainlinksorcomponents.
• Evidenceofheatdamage.
• Excessivepittingorcorrosion.
• Lackofabilityofchainorcomponentstohinge(articulate)freely.
• Weldsplatter.
• Forhooks,removalcriteriaasstatedinASMEB30.10
• Otherconditions,includingvisibledamage,thatcausedoubtastothecontinueduseofthesling.
Inspectalllugsandfixingpointsforsignsofelongationand/orbending,orformaterialbuild-uparoundthehole.Repairorreplace
componentsthatappeardistorted.Ensureall hardwareistightandingoodcondition. Replacemissinghardwareifnecessary.All
hardwaremustbefreeofrustandcorrosion.
Additionalinspectionsshallbeperformedduringslingusewhereserviceconditionswarrant.Periodicinspectionintervalsshallnot
exceedoneyear.Thefrequencyofperiodicinspectionsshouldbebasedon:
• Frequencyofuseoftheload-bearingdevice.
• Severityofserviceconditions
• Natureofliftsbeingmade
• Experiencegainedontheservicelifeofload-bearingdevicesusedinsimilarcircumstances.
Guidelinesfortheintervalare:
• NormalService-yearly
• SevereService-monthlytoquarterly
• SpecialService-asrecommendedbyaqualifiedperson