Farr HD8625 - Breaking a Connection; Illustration 2.H.8: Setting Backing Pin To Break-Out Position

Technical Manual
hD8625 8-
5
/
8
” 35K Tong
2.23
2. Breaking A Connection
YOUR TONG SHOULD BE PROPERLY SUSPENDED, CONNECTED TO A HYDRAULIC POWER
SOURCE, AND READY TO BREAK CONNECTIONS.
a) Ensurehydraulicpowersupplytothetongisenergized.Themasterlinkontherigidslingmustbeusedtosuspendthetong.
Donotsuspendthetongdirectlyfromtherigidsling.SeeIllustration2.H.1.
b) Setthebackingpinonthetong“breakout”operation.Liftuponthebackingpinandrotateittothe“breakout”position,whichis
2o’clockasseenfromthefrontofthetong.Theopeningintherotarygearmustbealignedwiththetongdooropeninginorder
toproperlysetthebackingpin(seeIllustration2.H.8).
IllustratIon 2.H.8: settIng BaCkIng PIn to “Break-out” PosItIon
c) Ensuretheloadcellisconfiguredforbreak-outoperation.Iftorquemeasurementforbreak-outisrequired,connecttheloadcell
totheoff-driller’sside(theright-handsideasseenfromtherearofthetong).
d) Connectsnublinestotherearofthetongtoarrestuncontrolledrotationoftheassembly.Thesnublinesmustberatedforthe
appliedtorquepluswhateversafetymarginsstatedbyyourownoperatingpolicies.Thesnublineconnectionpointsonthedrill
floormustbesturdyenoughtoabsorballappliedandpotentialforces.
e) Openthetongdoor(seeIllustration2.H.4).
f) Actuatetheliftcylindercontrolvalvetolifttheassemblyfromthedrillfloorifnecessary.Pullingthevalvetowardtheoperatorwill
retracttheliftcylindertolifttheassembly(seeillustration2.H.3).Notethatrigpersonnelarerequiredtostabilizethetongasit
isbeingliftedsoitdoesnotswingandcollidewithotherrigequipment.Movethetongontothestring.
RIG PERSONNEL MUST STABILIZE THE TONG AS IT IS LIFTED FROM THE DRILL FLOOR
g) Firmlyclosethetongdooragainstthelatchpost.
h) Rigpersonnelmayberequiredtostabilizethetongabovetheconnectionuntilthejawshavebeenclampedshut.
i) Break-outtorqueisonlyavailablewhentongmotorspeedissettolowspeedandtongisinlowgear.SeeSection2.G.2toset
tongtolowspeedandSection2.G.3toshifttolowgear.Donotshiftgearswhilethetongisrotating.
seTup & operaTion
SHIFTING TONG WHILE ROTATING THE MOTOR AND CAGE PLATE MAY RESULT IN
CATASTROPHIC GEAR TRAIN FAILURE