Farr HD8625 - 3. Reference Checking Your Torque Measurement System

6.6
hD8625 8-
5
/
8
” 35K Tong
Technical Manual
Torque MeasureMenT
C. PERIODIC INSPECTION AND MAINTENANCE
MAINTAIN GREATER-THAN HALF FULL FLUID LEVEL IN THE HAND PUMP BOWL TO AVOID PUMPING
AIR INTO THE SYSTEM. DO NOT ALLOW THE LEVEL TO FALL BELOW ONE-HALF FULL
UN-CONTAINED SPILLAGE OF THE HYDRAULIC FLUID IN THIS SYSTEM MAY CONTRAVENE GOV-
ERNMENTAL ENVIRONMENTAL REGULATIONS, OR THE ENVIRONMENTAL REGULATIONS AND
POLICIES OF YOUR COMPANY. FARR CANADA CORP. HIGHLY RECOMMENDS PLACING YOUR
LOAD CELL IN A CONTAINMENT BASIN BEFORE PROCEEDING WITH THE BLEEDING & REFILLING
PROCESS.
d. FillhandpumpbowlwithW15/16hydraulicfluid.
e. Remove the vent plug screw and Stat-O-Seal (Items C and D on Illustration 6.A.4, or item H on Illustration 6.A.5) to allow
trappedairtoescape.
f. Pumpfluidintothesystemuntilnomoreairisseenescapingfromtheventport.
g. ReplacetheventplugscrewandStat-O-Sealandtightensecurely.
h. Removeloadcellfromcontainmentvessel andwipeclean.Reclaimthehydraulicfluid (ifitisclean)ordisposeof allwaste
materialsaccordingtogovernmentaloryourcompany’sproscribedenvironmentalprotectionregulations.
i. Disconnectthehandpumpfromthetorquegauge.
j. Replacethebrasscaponthetorquegaugecheckvalvefitting.
3. Reference Checking Your Torque Measurement System
Thefollowingstepsdefineaprocessfordeterminingifyourtorquemeasurementsystemiscorrectlymeasuringandindicatingwithin
anexpectedrange.Thisprocedureisbestsuitedforperforminginashoporlocationremovedfromthedrillfloor,withinrangeofa
crane.Thisisareferencecheckandnotacalibration.Calibrationsmustbeperformedatanauthorizedcalibrationfacility.
TensionLoadCell
a. Locateaknownweightintherangeofapproximately500to1000lbs(227to455kg),andmovetheweightnexttothetong
andbackupassembly.
b. Removethetensionloadcellfromthetong,butdonotdisconnectfromthetorquegauge.
c. Suspendtheloadcell,pistonsideup,fromacranecapableofsupportingtheknownweightinStep3a.
d. Connecttherodsideoftheloadcelltotheknownweight,andusethecranetohoisttheweightfromthesurfacetobesus-
pendedfreely.
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1. Inspection
Thetorquemeasurementsystemsuppliedwithyourequipmentisdesignedandbuilttoprovideyearsoftrouble-freeservicewith
minimummaintenance.Periodicinspectionsoftheloadcell,hydrauliclinesandfittingsarerecommendedinordertokeepthesystem
intopoperatingcondition.Athoroughinspectionshouldbemadeateachrig-up.
2. Fluid Recharge
Recharge hydraulic system with W15/16fluid through the checkvalveon the torque indicatinggauge. Recharging must only be
performedwhenthereisnoloadontheloadcell.Refertotheillustrationsonpages6.3&6.4forguidanceifrequired.
a. Placethetorqueindicatinggaugehigherthantheloadcell.Removethebrass1/4”capfromthefittingonthecheckvalveon
thetopofthegauge.
b. Connectthehandpumptothecheckvalvefitting.
c. Elevatetheloadcellsoitishigherthanthetorquegaugeandhandpump.
ONLY QUALIFIED, DESIGNATED PERSONNEL ARE PERMITTED TO PERFORM MAINTENANCE ON THE
TORQUE MEASUREMENT SYSTEM.