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Cairn Energy India PTY Ltd
BSPL Project - Barmer to Salaya Pipeline
CALCULATION
StabilityCalculation 52893.03
24" Oil Pipeline (Full) 03-P-2-004
1 of 4
DOCUMENT No OFFICE CODE PROJECT No AREA DIS TYPE NUMBER
05 5893 03 P 2 004
01 21.05.07 Issued For IDC PD J C PD BS CEIL
REV DATE DESCRIPTION BY CHK ENG PM Client
PROJ ECT NO.
REF
No OF SHEETS
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JP Kenny
CLIENT .
SUBJECT
DOC NO. .
PRPD BY Paul Docherty
DATE 5-May-07
1.0 INTRODUCTION
2.0 METHOD
3.0 REFERENCE DATA
The reference data for this calculation has come from:
Reference 1:
Reference 2:
4.0 CALCULATIONS
4.1 Pipe DetailsNom. Pipe Outside Diameter OD = 0.610 m = 24 in
Specified Wall Thickness t = 0.018 m = 17.5 mm
Concrete Coating Thickness tc = 0.100 m = 100 mm
4.2 Coating and Insulation Details
Thickness of the outer coating tp = 0.008 m = 8.0 mm
Density of the outer coating Dp = 9771 N/m3 = 996 kg/m
3
Thickness of the Insulation ti = 0.100 m = 100.0 mm
Density of the insulation Di = 589 N/m3 = 60 kg/m
3
4.3 Density and Stability Factor
Density External Fluid (Water) De = 9810 N/m3 = 1000 kg/m3
Density Pipe Contents Di = 9618 N/m3 = 980.4 kg/m
3
Density Pipe Steel Ds = 76420 N/m3 = 7790 kg/m
3
Density Concrete Dc = 29921 N/m3 = 3050 kg/m
3
Density Soil Dg = 14862 N/m3 = 1515 kg/m
3
Density of Liquified Soil DL = 12753 N/m3 = 1300 kg/m
3
Stability Requirement Sm = 1.25
Depth of Cover H = 1.0 m
CHKD BY
0
Cairn Energy India Limited J OB NO. 52893.03
24" Crude Oil Pipeline
05 - 2893 - 03 - P - 2 - 004 REV NO.
Cairn Energy India Limi ted
PIPELINE STABILITY CALCULATION
Crude Pipeline Design Refer to Wall thickness Report 052893 - 03 - P - 3 - 020
and range of Calculations from 002 to 010
J ateen Chohan
The above method is overly conservative as it considers a pipeline free floating in water. In reality the
pipeline lays in a trench covered by soil which will provide a hold down force to prevent floatation. This force is calculated by determining the submerged weight of soil above the pipeline.
ASME B 31.4 Design and OISD - STD - 141 2001
API 5L X65
The method used to determine the stability of the pipeline through water courses is to calculate the
total weight of the pipeline and compare it with the weight of the external fluid (water) it would
displace. In order for the pipeline to be considered stable, the pipeline weight must be 10% greater
than the weight of the water displaced.
Paul Docherty
21-May-07
APP'D BY
21-May-07
The aim of this calculation is to determine the stability of the pipeline through water course crossings.
DATE DATE
03-P-2-004 Rev 01 - 24 inch Stability Full Crude with Insulation.xls
21/05/2007 Page 2 of 4
Self Check...........................
Date...........................
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JP Kenny
Cairn Energy India Limi ted
PIPELINE STABILITY CALCULATION
4.4 Weight of Pipeline
Cross-sectional area Steel As =
= 0.033 m2
Weight of steel Ws = As*Ds
= 2488 N/m
Cross-sectional area - internal Ai =
= 0.259 m2
Weight of pipe contents Wi = Ai*Di
= 2494 N/m
4.5 Insulation and Protective Coating
CSA Insulation Ain =
= 0.223 m2
Weight of Insulation Win = Ain*Di
= 131 N/m
CSA Polyurathane Coating Ap =
= 0.021 m2
Weight of Coating Wp = Ap*Dp
= 201 N/m
4.6 Concrete Coating ( Note: no consideration has been made for reinforcement)
Total Pipeline Outside Diam. OD T =
= 1.0256 m
Cross-sectional area - coating Ac =
= 0.291 m2
Weight of concrete coating Wc = Ac*Dc
= 8700 N/m
Total Weight of Pipeline Wt = Wp+Win+Ws+Wi+Wc= 14014 N/m
4.7 Pipeline Buoyancy in Water
CSA Pipe+Ins +coatings At =
= 0.826 m2
Weight of displaced fluid We = At*De
= 8104 N/m
Required Buoyancy Br = Sm*We
= 10130 N/m
4
pi()*OD T 2̂
4
pi()*(((2*ti)+OD)̂ 2-(OD)̂ 2)
4
pi()*(OD T 2̂ -(2*tp+2*ti+OD)̂ 2)
OD +2*(tp+ti+tc)
4
pi()*(OD 2̂-(OD-2*t)̂ 2)
4
4
pi()*(((2*(tp+ti))+OD) 2̂-((2*ti)+OD) 2̂)
pi()*(OD-2*t)̂ 2
03-P-2-004 Rev 01 - 24 inch Stability Full Crude with Insulation.xls
21/05/2007 Page 3 of 4
Self Check...........................
Date...........................
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JP Kenny
Cairn Energy India Limi ted
PIPELINE STABILITY CALCULATION
Pipeline Buoyancy, open trench Bp = Wt-Br
= 3884 N/m
Cross-sectional area of trench Ad =
= 0.826 m2
Submerged weight of soil Wg = Ad*(Dg-De)
= 4171 N/m
Pipeline Buoyancy, buried Bs =
= 8055 N/m
4.8 Pipeline Buoyancy in Liquified Soils
Weight of displaced fluid Wm = At*DL
= 10536 N/m
Required Buoyancy Bm = Sm*Wm
= 13169 N/m
Pipeline Buoyancy, liquified soil BL = Wt-Bm
= 845 N/m
5.0 Summary of Results
Required
0.0
0.0
0.0
The buried pipeline will be stable through flooded water courses.
OK
Pipeline Buoyancy, liq soil (N/m) 844.6 OK
3883.7
The pipeline will be stable through flooded water courses where soil liquification has occurred.
The pipeline in an open trench will be stable through flooded water courses.
Variable
Pipeline Buoyancy, open (N/m)
Pipeline Buoyancy, buried (N/m) OK 8054.8
Value
The results of the stability calculations are detailed in the following table:
(OD+2*ti+2tp)*H
(Wg+Wt)-Br
03-P-2-004 Rev 01 - 24 inch Stability Full Crude with Insulation.xls
21/05/2007 Page 4 of 4
Self Check...........................
Date...........................