User Manual

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pointrelativetotheuser’sFBHD‐ring,i.e.,overheadornon‐overheadanchoragecondition,plusswingfallandhowanexpandedworkzoneaffectsthese
variables.
4.3.1Overhead(AbovetheD‐ring)AnchorageCondition:Inanoverheadanchoragecondition,theSRDisinstalledanywhereintheallowableattachment
area,whichrangesfromdirectlyabovetheusertoaslowastheleveloftheFBHD‐ring,asshowninFigure3AinAppendixA.Theoverheadcondition
MRFChasthreemetrics,labeledA,B,andC,measuredfromthewalking/workingsurface.Thesumtotalofthesemetrics,labeledD,istheMRFC.
A=SRDdecelerationdistance
B=D‐ringshiftandharnessstretch
C=Safetyfactor
TheMRFCforanoverheadanchorageiscalculatedasA+B+C=D.
4.3.2Non‐Overhead(BelowtheD‐Ring)AnchorageCondition:Inanon‐overheadanchoragecondition,theanch orpointislevelwith
theFBHdorsalD‐
ring,orupto2'belowit,asshowninFigure3BinAppendixA.TheMRFCforabelowtheD‐ringconditionhasfivemetrics,labeledA,B,C,D,andE,andare
measuredfromthewalking/workingsurface.Thesumtotalofthese
metrics,labeledF,istheMRFC.
A=AnchorageDistancebelowDorsalD‐ring
B=SRDDecelerationDistance  
C=AdditionalDecelerationDistanceduetoBelowD‐ringattachment
D=D‐ringshiftandharnessstretch
E=Safetyfactor
TheMRFCforananchoragebelowtheD‐ring
iscalculatedasA+B+C+D+E=F.Beawarethatiftheuseriskneelingorcrouchingwhileperformingwork,add
uptoanadditional3feettothetotalMRFC.
4.4SwingFall:Aswingfalloccurswhentheworkermoveslaterallyoutfromthecenteroftheworkzoneandcreatesanexpandedworkzonecondition.
SeeFigure4inAppendixA.Ifafalleventoccurs,theworkerwouldswingbacktowardtheanchorage.Theswingingactiongeneratesconsiderableforce,
andiftheworkerstrikesanobstructionorcameintocontactwiththelowerlevelortheground,thisforcecould
causesevereinjuryordeath.
4.4.1OverheadAnchorageandSwingFall:Foreachfootofworkzoneexpansion,theriskofsevereinjuryordeathfromaswingfallincreases.Also,asan
anchoragebecomeslowerrelativetotheFBHD‐ring,riskincreases.Combineanexpandedworkzonewith
aloweranchorageandtheriskincreases
greatly.ThisincreasedriskrequiresadditionalMRFCdistance.SeeChart1forinstructionsonhowtodetermineasafeworkzone.
4.4.2Non‐OverheadAnchorageandSwingFall:Aswingfallfromanexpandedworkzone,combinedwiththemuchlowerheightof a
non‐overhead
anchorage,willsignificantlyincreasetheriskofsevereinjuryordeathduetothelongerdistancetheuserwouldfall.Thisconditionrequiresanincreased
MRFC.SeeChart1forinstructionsonhowtodetermineasafeworkzone.
WARNING
AnexpandedworkzonecombinedwithanSRDusedinanon‐overhead(belowtheD‐ring)conditionisextremelyhazardous.
DONOTattachtoananchoragemorethan2feetbelowtheleveloftheFBHD‐ring.
4.5LockingSpeed:TheSRDutilizesacentrifugallyactivatedpawllockingmechanismtoapplyadiscbraketoslowandarrestafall.Thisrequiresacertain
minimumpay‐outratetofunction.Somesituations,confinedorcrampedspaces,shiftingfootingsuchassand,gravel,grain,oraslopedsurface,maynot
allowthelifelinetoreachsufficientspeedtoactivatethelockmechanism.AclearpathisrequiredtoassurepositivelockingoftheSRD.
4.6InstallationandUseoftheSRD:Usecompatibleconnectorswhenconnectingtotheanchorageandensureunintendeddisengagementcannotoccur.
Visuallyensuretheconnectorclosesandlockssecurely.SeeFigure13inAppendixB.TheSRDisconfigurableintotwoorientationoptions;
4.6.1Housing
EndAttachedtotheFBH:TheSRDhousingendisinstalledtothedorsalD‐ringofanFBHandthelegendattachedtoasuitableanchorage.
Theanchoragemayrangefromdirectlyoverhead,toaslowas2'belowthedorsalD‐ring.ReferbacktoFigure2AinAppendixA.ToattachtheSRDonthe
harnessseeFigure5AinAppendixA.Followthesesteps:
1. Dontheharnessinaccordancewiththeharnessmanufacturer’sinstructions.
2. InsertthenoseendofanANSIcompatibledouble‐lockingcarabinerthroughtheSRDhousingswiveleye.
3. AttachthecarabinertothedorsalD‐ringoftheFBH.Ensurethecarabinerisorientedwiththelockopeningupandwilltaketheloadalongitsmajor
axis.Visuallyensurethecarabinerlockisfullyclosedandlocked.
4. Connectthelegendconnectortoanapproved,suitableanchor
thatmeetsworkzonerequirements.
TheSRDwillpayoutandretractsmoothlytomaintainatautlineduringnormalmovement.Workasdirectlyundertheanchoraspossible.Ifnecessary,the
legendconnectormaybeattachedtoalowerlevelanchorage,upto2ft.belowtheuser’sharness
D‐ring.Beawarethataloweranchorageincreasesthe
riskofinjuryduetoswingfall.Additionalfallclearanceisrequired.
4.6.2HousingEndAttachedToTheAnchorage:Thehousingendconnectorisinstalledtoasuitableanchorage.Theanchorpointmayrangefromdirectly
overheadtoaslow
as2'belowthedorsalD‐ring.ReferbacktoFigure2B.ThelegendisconnectedtothedorsalD‐ringoftheFBH.
Toattachthehousingtoananchorage,seeFigure5Bandfollowthesesteps;
1. Dontheharnessinaccordancewiththeharnessmanufacturer’sinstructions.
2. InsertthenoseendofanANSIcompatibledouble‐lockingcarabinerthroughtheSRDhousingswiveleye.
3. Attachthecarabinertotheanchorpoint.Ensurethecarabinerisorientedwiththelockopeningupandwilltaketheloadalongitsmajoraxis.Visually
ensurethecarabinerlockis
fullyclosedandlocked.
4. ConnectthelegendconnectortothedorsalD‐ringoftheFBH.Visuallyensuretheconnectorisfullyclosedand locked.
TheSRDwillpayoutandretractsmoothlytomaintainatautlineduringnormalmovement.Workasdirectlyundertheanchoras
possible.Ifnecessary,the
legendconnectormaybeattachedtoalowerlevelanchorage,upto2ft.belowtheuser’sharnessD‐ring.Beawarethataloweranchorageincreasesthe
riskofinjuryduetotheswingfalleffect.Additionalfallclearanceisrequired.
DONOTattachthe
SRDlegendtotheFBHwitharebarhookoranylarge‐throatsnaphookorlargecarabiner.Asideloadcouldcauseanunintentional
disengagement.Usesmallsnaphooksonly.
DONOTattachthehousingtotheFBHwitharebarhookoranylarge‐throatsnaphook
orlargecarabiner.Asideloadcouldcause unintentional
disengagement.
4.7ImpactIndicator:TheSRDincorporatesafallarrestimpactindicatorintheweblifeline,betweenthehousingandlegendconnector,intheformofa
stitchedfold.BrokenortornstitchingindicatestheSRDhas beensubjectedto
fallarrestforces.RemovetheSRDfromserviceimmediately.
DONOTallowthelifelinetobecometangledortwistedasthismaypreventitfromretracting.
DONOTallowthelifelinetopassunderarmsorbetweenlegsduringuse.