Farr KT5500 - Inspection of Slings; Minimum Allowable Chain Link Thickness at any Point

KT5500 5-
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” Tong & CLInCHER® BaCKup
SECTIon ConTEnTS
2.2
TECHnICaL ManuaL
SETup & opERaTIon
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:
Minimum Allowable Chain Link Thickness at Any Point
Nominal Chain Size Minimum Thickness
Inches MM Inches MM
7/32 5.5 0.18 9 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
• 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