Pipeline Stability and Weight Coating Calculation

Calculation Cover Sheet Calc no

DOC NO.

File

DOC NO.

Project title

GN INFILL PROJECT

Phase/CTR

Client Calculation title Calculation objective

MAJOR OIL Pipeline Stability & Weight Coating Calculations

Deliverable Page 3

Elec file location

1. To determine the on-bottom stability of various GN Ubie phase 2 pipelines in the liquefied swampy terrain and in a typical water crossing 2. If required, calculate the thickness of concrete weight coating (of density 3040 Kg/m3) to give the pipeline a negative buoyancy factor of 1.3 3. Analysis based on the worst case scenario of "decommissioned case corroded pipe empty".

Calculation method The calculations are performed in accordance with the following general equation: Wpipe Wbuoy Where

>= 1.3

Wpipe = Total weight of pipe in air Wbuoy = Weight of water/mud displaced

Method of analysis is based on in-house spread sheet detailed in the section Method of Analysis Basic Data & Assumptions The following basic data and assumptions were applied:Safety Factor

= 1.3

- MAJOR OIL Requirement (Ref. 2)

Specific Gravity of swamp water

= 1.02

- Typical for Niger Delta (from Ref. 2)

Specific Gravity of river bed water/mud

= 1.442

- Assumed (from Ref. 2)

Density of concrete

= 3040 Kg/m3

Concrete coating of less than 25mm is practically not achivable. Therefore a minimum concrete thickness of 25mm will apply where required.

Further Assumptions g pp p and water swamp p or water 1)) Effect of marine g growth has not been considered as there is little evidence of significant marine g growth in the applicable swamp conditions. 2) Stability analysis and weight coating calculations for river crossings have been based solely on forces due to buoyancy of the river water. Forces (lift and drag) due to river current and tidal velocities have not been considered, because the pipelines will be trenched. 3) Calculated wall thickness less corrosion allowance has been used for the weight coating analysis.

References 1 2

GN Ubie Phase II Pipeline Mechanical Design Report MAJOR OIL Standard Pipeline and Flowline Design Manual

March 2002

Conclusions 1) On-bottom stability analysis has been carried out for the various GN Ubie phase 2A Pipelines and weight coating thicknesses have been determined where required. Analysis and results are presented in the individual work sheets, while the recommended coating thicknesses are in the summary sheet. 2) The required Safety Factor of 1.3 - with the determined weight coating thickness - is very adequate to ensure on-bottom stability of the Pipeline under buoyancy conditions. 3) A minimum concrete thicknessof 25mm will always be applied for all submerged pipeline river crossings as mechanical impact protection.

C01

12-Apr-11

Approved For Construction

SH

ET

KLA

A02 A01 R01

16-Feb-11 13-Jan-11 13-Dec-10

Issued for Approval Issued for Review Issued for Interdisciplinary Check

SH SH SH

ET ET ET

KLA KLA KLA

REV

DATE

DESCRIPTION

BY

CHECKED

APPROVED

Page 1 of 4

STABILITY AND WEIGHT COATING CALCULATIONS

Calculation Checklist Calc no DOC NO. File DOC NO. Elec file location Project title GN INFILL PROJECT Phase/CTR Client MAJOR OIL Deliverable Calculation title Pipeline Stability & Weight Coating Calculations Page 4 Please check boxes for all applicable items checked or delete if not appropriate: Calculations:

Calculation number assigned and registered Project title shown. Calculation title shown. Revision history box complete and signed. Index. Appropriate stamp for preliminary issues. Calculation objectives (aims) stated. Calculation method defined or described (including formulae if relevant). Reference made to text, standard or code. Check version/edition with that required for project. Source of input data stated (with revision number and date if relevant). Assumptions stated. Summary of results or conclusions if appropriate. For software based calculations, reference to software verification if available. Method clear and easy to follow. Input data correct. Calculation arithmetically correct OR software previously verified and reference to verification checked. Calculation result within expected limits. Calculation tolerances stated if significant. Units used as required by client. Abbreviations correct. Appropriate cross-references. Sketches included and clearly labelled, where required. bility a Attachments included and referenced, as required. Any precedent calculations updated Checking records: Checked and annotated copy of calculation filed (use "Check Print" stamp). Corrections made as required and calculation dated and signed on cover sheet by checker. Revisions: Changes clouded. Revision history block updated. Calculation re-checked if required. C01 A02 A01 R01

12-Apr-11 16-Feb-11 13-Jan-11 13-Dec-10

Approved For Construction Issued for Approval Issued for Review Issued for Interdisciplinary Check

SH SH SH SH

ET ET ET ET

KLA KLA KLA KLA

REV

DATE

DESCRIPTION

BY

CHECK

APPROVED

Page 2 of 4

STABILITY AND WEIGHT COATING CALCULATIONS

Calculation Sheet Proj No Phase/CTR

Calc No.

DOC NO.

Project

GN INFILL PROJECT

Deliverable

Subject

Pipeline Stability and Weight Coating Calculations

Client

MAJOR OIL

Sheet

5

Pipeline REV

DATE

BY

CHK

APP

C01

4/12/2011

SH

ET

KLA

PIPELINE WEIGHT COATING AND STABILITY ANALYSIS DESCRIPTION

SYMBOLS

INPUT

PIPE OUTSIDE DIAMETER

ODpipe

in/m

DATA

WALL THICKNESS

WTpipe

mm/m

INTERNAL CORROSION ALLOWANCE

WTcorr

mm

FBE PRIMER THICKNESS

WT FBE

mm

PE ADHESIVE COATING THICKNESS

WT Adh

mm

PE 3-LAYER COATING THICKNESS

WT3LPE

mm

CONCRETE COATING THICKNESS

WTconc

mm

MARINE GROWTH THICKNESS

WTmar

mm

pipe fbe

Kg/m

ADHESIVE COATING DENSITY

rAdh

Kg/m

COATING 3 LAYER PE DENSITY

3 LPE

Kg/m3

CONCRETE COATING DENSITY

conc

Kg/m

MARINE GROWTH DENSITY

mar

Kg/m

PRODUCT DENSITY

cont

Kg/m3

mud water

Kg/m

SWAMP MUD DENSITY RIVER BED WATER/MUD DENSITY

Case 2

Case 3

Case 4

Case 5

Case "n"

Values for Concrete Coating thickness obtained using Goal Seek with SG >= 1.3

FBE DENSITY

PIPE DENSITY

Case 1

UNIT

3

Kg/m3 3

3 3

3

Kg/m3

FORMULAE /METHOD OF ANALYSIS OUTPUT

INTERNAL DIAMETER

IDpipe

m

DATA

OVERALL DIAMETER

ODtotal

m 2

m

INT. X-SECTION AREA

Apipe

PIPE X-SECTION AREA

Asteel

m

PIPE WEIGHT

Wpipe

Kg/m

FBE COAT WEIGHT

W FBE

Kg/m

2

IDpipe = ODpipe - 2 x WTpipe ODtotal = ODpipe + 2 x WT FBE + 2 x WT Adh + 2 x WT 3LPE + 2 x WTconc Apipe = /4 x (IDpipe)2 Apipe = /4 x ((ODpipe)2 -(IDpipe)2) Wpipe =Apipe x Ppipe

N/m

W Fbe = /4 ((ODpipe + 2 x WT FBE)2 -(ODpipe)2) x Fbe

N/m ADHEHSIVE COATING WEIGHT

W Adh

Kg/m

W Adh = /4 x ((ODpipe + 2 x WT FBE + 2 x WT Adh)2 - (ODpipe + 2 x WT FBE)2) x Adh

N/m COATING 3 LAYER PE WEIGHT

W 3 LPE

Kg/m N/m

CONCRETE COATING WEIGHT

Wconcrete

Kg/m

MARINE GROWTH WEIGHT

Wmarine

Kg/m

PRODUCT WEIGHT

Wproduct

Kg/m

Wdry

Kg/m

WEIGHT OF DISPLACED WATER

Wbuoy

Kg/m

WEIGHT OF DISPLACED MUD

Wmud

Kg/m

N/m N/m N/m TOTAL WEIGHT IN AIR

N/m N/m WEIGHT OF PIPE IN WATER

Wsuba

Kg/m

WATER FILLED SUBMERGED WEIGHT

Wsubw

Kg/m

PRODUCT FILLED SUBMERGED WEIGHT

Wsubp

Kg/m

W3LPE = /4 ((ODpipe + 2 x WT FBE + 2 x WT Adh + 2 x WT3LPE)2 - (ODpipe + 2 x WT FBE + 2 x WT Adh)2) x 3LPE Wconc =P/4 x ((ODpipe + 2 x WT FBE + 2 x WT Adh + 2 x WT3LPE + 2 x WTconc)2 (ODpipe + 2 x WT FBE + 2 x WT Adh + 2 x WT 3LPE)2) x conc Wmar = /4 ((ODpipe + 2 x WT FBE + 2 x WT Adh + 2 x WT3LPE + 2 x Wtconc+ 2 x WTmar )2 - (ODpipe + 2 x WT FBE + 2 x WT Adh + 2 x WT 3LPE + WTconc)2) x mar Wcont = Apipe x cont Wdry = Wpipe + WFBE + WAdh + W3LPE + Wconc + Wmar + Wcont Wbuoy = /4(ODtotal)2 x water Wmud = /4(ODtotal)2 x mud Wsuba = Wdry - Wbuoy

N/m

Wsubw = Wdry - (Wbuoy - Apipe x Pwater)

N/m

Wsubp = Wdry - (Wbuoy - Apipe x Pproduct

N/m SPECIFIC GRAVITY OF PIPELINE IN WATER

SGwater = Wdry / Wbuoy SGmud = Wdry / Wmud (Set to a 1.3 factor in Goal Seek as per MAJOR OIL requirement) IF SGwater >= 1.3, NO, otherwise, YES IF SGmud >= 1.3, NO, otherwise, YES

SGwater

1.3

SPECIFIC GRAVITY OF PIPELINE IN MUD

SGmud

1.3

CONCRETE WEIGHT COATING REQ. (WATER CRO

YES/NO

CONCRETE WEIGHT COATING REQ. (SWAMP)?

YES/NO

CONCRETE COATING THICKNESS (WATER CROSS

WTconc

mm

Recommended Concrete Coating thickness from values in Row 21 rounded to the nearest 5mm

CONCRETE COATING THICKNESS (SWAMP)

WTconc

mm

Recommended Concrete Coating thickness from values in Row 21 rounded to the nearest 5mm

Page 3 of 4

STABILITY AND WEIGHT COATING CALCULATIONS

Calculation Sheet Proj No Phase/CTR

Calc No.

Project

File

GN INFILL PROJECT

DOC NO.

Subject

Pipeline Stability and Weight Coating Calculations

Client

MAJOR OIL

Pipeline

12" Koroama - CPF NAG Bulkline - CS

Sheet

9

REV

DATE

BY

CHK

APP

C01

4/12/2011

SH

ET

KLA

PIPELINE WEIGHT COATING CALCULATIONS DESCRIPTION

SYMBOLS

UNIT m

Case 1 Case 2 Case3 Case4 Case3 Installed '12" Corroded 12"+ Installed '12" Corroded '12" Installed '12" +3LPE df 0.72 3LPE DF 0.72 +3LPE DF 0.6 +3LPE DF 0.6 +3LPE DF 0.5 SWAMP SWAMP RIVER X RIVER X RIVER X 0.3239 0.3239 0.3239 0.3239 0.3239

Case4 Corroded '12" +3LPE DF 0.5 RIVER X 0.3239

INPUT

PIPE OUTSIDE DIAMETER

ODsteel

DATA

WALL THICKNESS

WTsteel

m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

INTERNAL CORROSION ALLOWANCE

WTcorr

mm

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

FBE EXTERNAL THICKNESS

WT FBE

mm

0.5000

0.5000

0.5000

0.5000

0.5000

ADHESIVE COATING THICKNESS

WT FBE

mm

0.5000

0.5000

0.5000

0.5000

0.5000

0.5000

COATING 3 LAYER PE THICKNESS

WT 3 Layer PE

mm

3.0000

3.0000

3.0000

3.0000

3.0000

3.0000

CONCRETE COATING THICKNESS

WTconc

mm

0.0000

MARINE GROWTH THICKNESS

WTmar

mm

4.8393

20.9921

0.5000

0.0000

3.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

7850.0000

7850.0000

7850.0000

7850.0000

7850.0000

7850.0000

Kg/m

FBE DENSITY

pipe fbe

1950.0000

1950.0000

1950.0000

1950.0000

1950.0000

1950.0000

ADHESIVE COATING DENSITY

fbe

Kg/m

1400.0000

1400.0000

1400.0000

1400.0000

1400.0000

1400.0000

coat 3 LPE conc mar cont mud water

Kg/m3

940.0000

940.0000

940.0000

940.0000

940.0000

940.0000

Kg/m

3040.0000

3040.0000

3040.0000

3040.0000

3040.0000

3040.0000

Kg/m3

0.0000

Kg/m3

1.2000

Kg/m3

1442.0000

1442.0000

1442.0000

1442.0000

1442.0000

1442.0000

1020.0000

1020.0000

1020.0000

1020.0000

1020.0000

1020.0000

STEEL DENSITY

COATING 3 LAYER PE DENSITY CONCRETE COATING DENSITY MARINE GROWTH DENSITY PRODUCT DENSITY MUD DENSITY SWAMP WATER DENSITY

3 3

Kg/m

3

3

3

Kg/m

0.0000 1.2000

0.0000 1.2000

0.0000 1.2000

0.0000 1.2000

0.0000 1.2000

Pipeline Stability and Weight Coating Calculations OUTPUT INTERNAL DIAMETER DATA

IDsteel

m

OVERALL DIAMETER

ODtotal

m

INT. X-SECTION AREA

Apipe

m

2 2

#REF!

#REF!

0.3405

0.3728

#REF! 0.3309

#REF! 0.3369

#REF! 0.3309

#REF! 0.3309

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

STEEL X-SECTION AREA

Asteel

m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

PIPE WEIGHT

Wsteel

Kg/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

N/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

FBE COAT WEIGHT

W FBE

Kg/m

0.99

0.99

0.99

0.99

0.99

N/m

9.74

9.74

9.74

9.74

9.74

0.99 9.74

0.72

0.72

0.72

0.72

0.72

0.72

ADHEHSIVE COATING WEIGHT

W FBE

Kg/m N/m

7.02

7.02

7.02

7.02

7.02

7.02

COATING 3 LAYER PE WEIGHT

W 3 LPE

Kg/m

2.91

2.91

2.91

2.91

2.91

2.91

N/m

28.57

28.57

28.57

28.57

28.57

28.57

CONCRETE COATING WEIGHT

Wconc

Kg/m

15.56

70.74

0.00

9.59

0.00

0.00

N/m

152.61

693.74

0.00

94.09

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

MARINE GROWTH WEIGHT

Wmar

Kg/m

PRODUCT WEIGHT

Wcont

Kg/m N/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

TOTAL WEIGHT IN AIR

Wdry

Kg/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

N/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

N/m

WEIGHT OF DISPLACED WATER WEIGHT OF DISPLACED MUD WEIGHT OF PIPE IN WATER

Wmud Wsuba

0.00 #REF!

0.00 #REF!

0.00 #REF!

0.00 #REF!

0.00 #REF!

0.00 #REF!

Kg/m

92.90

111.36

87.69

90.90

87.69

87.69

N/m

911.31

1092.42

860.24

891.73

860.24

860.24

Kg/m

131.33

157.43

123.97

128.51

123.97

123.97

N/m

1288.34

1544.39

1216.15

1260.66

1216.15

1216.15

Kg/m

#REF!

#REF!

#REF!

#REF!

#REF!

N/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF! #REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

WATER FILLED SUBMERGED WEIGHT

Wsubw

Kg/m N/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

PRODUCT FILLED SUBMERGED WEIGHT

Wsubp

Kg/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

SPECIFIC GRAVITY OF PIPELINE IN WATER SG Water

N/m

#REF!

#REF!

#REF!

#REF!

#REF!

#REF!

SPECIFIC GRAVITY OF PIPELINE IN MUD Is Wsubp >0.25*Wdry (for River Crossings)? (RE

#REF!

#REF!

#REF! #REF!

#REF! #REF!

#REF! #REF!

#REF! #REF!

SG Mud

Page 4 of 4

STABILITY AND WEIGHT COATING CALCULATIONS