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
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MS,Regular"&9&Z&F&C&"Trebuchet
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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
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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
MBD00059D05.unknown
MBD000FD175.unknown
MBD001D19E4.doc
MBD000B2ADF.unknown
MBD000E7177.unknown
MBD000EC030.unknown
MBD000BFE4C.unknown
MBD00094F5C.unknown
MBD0003B5AF.unknown
MBD000493DC.unknown
MBD0004959F.unknown
MBD00059D00.unknown
MBD00049596.unknown
MBD00048B29.unknown
MBD00042B4C.unknown
MBD0000F91D.unknown
MBD0003981E.unknown
