1. FrontSpread SheetCALCULATIONS FOR DESIGN OF PIPELINE ANCHOR BLOCKPetrofac E&C Business Management SystemDoc No.SHJ-BMS-EN-VSS-C-1748Revision0Date11-Oct-06

&L&"Trebuchet MS,Regular"&9Pipeline Anchor Block Design&R&"Trebuchet MS,Regular"&9SHJ-BMS-EN-VSS-C-1748 0&L&"Trebuchet MS,Regular"&9&Z&F&C&"Trebuchet MS,Regular"&9&A / Page &P of &N&R&G

2. ControlRevision historyRevDateDescription of Change011-Oct-06ApprovedApproval Authority: (Enter Role Title)OwnerDeveloperReviewerApproverIndrajit chowdhurySanjeev GardeAnil B AlweIndrajit ChowdhuryRecords of approval are retained in the BMS/Quality DepartmentSummaryAnchor block is checked for its stability due to longitudinal pipeline anchor force. It is assummed that center line of anchor block matches with centerline elevation of pipeline.CONTENTWorkSheet1Front Page2Control Page3Content

&L&"Trebuchet MS,Regular"&9Two way slab design&R&"Trebuchet MS,Regular"&9SHJ-BMS-EN-VSS-C-1752 A&L&"Trebuchet MS,Regular"&9&Z&F&C&"Trebuchet MS,Regular"&9&A / Page &P of &N&R&G

CoverCALCULATIONS FOR DESIGN OF PIPELINE ANCHOR BLOCKANCHOR BLOCK MARKED : AB1Page 1 of010/11/06SGABAICFOR APPROVALREVDATEPPD BYCHKD BYAPPD BYDESCRIPTIONClient :Project :Document Number :

AB1Client:Job No:Page:ofProject:Prep by:Date:Subject:Ck'd by:Date:Design of Anchor Block for Underground PipelineInput Details :Size of Pipeline=42.00" dia1.0922mWeight of Soil=18.00KN/m3Geotech reportAngle of Int friction of soil=24.50degreesCohesion :=31.25KN/m2CAdhesion factor :a=0.65Foundation Analysis & Design By J E BowlesDepth of soil above top of pipeline=2.00mAs water table is very low, hence effect of buoyancy is not applicable in designAnchor Force =5250KNANCHOR BLOCKGround LevelPtopd =0.67mActive Earth PressurePassive Earth PressurePa1Pp1H =3.75mPa2Pp2PbottomKa g HKa g dKp g dKp g HPRESSURE DIAGRAMAnchor Block Details :Length:L=12.00mBreadth:B=2.75mDepth:H=3.75mGrade of concrete :35N/mm2Density of Concrete :25KN/m3Grade of Steel:390N/mm2Earth pressure area of block=44.06m2Base area of block=33.00m2Side wall area of block=20.63m2TAN (45o-f/2)=0.643TAN (45o+f/2)=1.555Calculations for stability :Stability of Anchor block is maintained by bringing the system under equilibrium with respctto externally applied force acting on Anchor block from pipeline, balanced by passive earthPressure and surface friction.Coefficient of active earth pressure :Ka ===0.4137(static)Coefficient of passive earth pressure :Kp ==2.4170(static)Coefficient of at rest earth pressure :Ko =1-sin f=0.5853067573(static)Active Earth Pressure:Pa1 ==-21.1330535557KN/m2Pa2 ==1.796KN/m2Pa =-9.6684418027KN/m2Passive Earth PressurePp1 ==92.3556534821KN/m2Pp2 ==226.3069217068KN/m2Only 65% of totalPp =Pp =103.5653369364KN/m2Active Earth pressure force=Pa * effective area of block=-426.0214974149KN0KNNeglecting due to tensionPassive Earth Pressure force =Pp * effective area of block=4563.4095774874KNd =TAN-1 (0.65*TANf)TANd =0.296Geotech reportPtop=(g*d*(TANd)+Ca)*B*L=788.40KNFoundation Analysis & DesignBy J E BowlesPbottom=((g*d+gc*H)*(TANd)+Ca)*B*L=1704.83KNconsidering the side wall earth pressure at rest condition for side friction calculationAt rest earth pressure :Po1 ==38.15KN/m2Po2 ==70.59KN/m2Po =54.3695931127KN/m2Psides=2*(0.5)*(Po*H*(TANd)+Ca)*H*B=832.30KNConsidered only 50%Conservative designSP=7888.94KNFactor of Safety=1.5026554507> 1.5 Hence SafeCheck for Bearing PressureWeight of soil above BlockWs =398.6334KNWeight of Anchor BlockWAB =3029.3379786415KNVolume =121.1735191457m3723.2530782229KN-mSoil Bearing Pressure :smax=151.70KN/m2Allowable Bearing Pressure :200KN/m2> Actual pressureSafe, Hence OKsmin=56.0595352278KN/m2No tension, hence AB is safeReinforcementProviding Nominal reinforcement in biaxial direction at faces =T16 @ 200 c/c

cDir of Anchor forceLBH

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