3554 es ja 007 expansion assessment for production riser reva

HOAN VU JOINT OPERATING COMPANY

CA NGU VANG FIELD DEVELOPMENT

DOCUMENT NUMBER

3554-ES-JA-007

DOCUMENT TITLE

CPP3 COMPLEX

EXPANSION ANALYSIS FOR PRODUCTION LINE

A 19/06/2007 ISSUE FOR REVIEW N.T.BINH M.N.KHOA/L.CUNG H.V.BICH P.V.P. -

REV DATE REVISIONS BY TL EM REIs APP. HVs APP.

TOTAL PAGE

13

DETAILED ENGINEERING PROJECT ID

CNV3554510

DETAILED ENGINEERING Project ID.

FOR CA NGU VANG FIELDS DEVELOPMENT PROJECT CNV3554510

CPP3 COMPLEX


Page No.

2 of 13

Doc. No: 3554-ES-JA-007 Rev. A

TABLE OF CONTENT

1. INTRODUCTION .............................................................................................................. 3

1.1. General................................................................................................................. 3

1.2. Definitions, symbols and abbreviations ........................................................... 3

1.3. Reference documents......................................................................................... 4

2. DESIGN DATA ................................................................................................................. 5

2.1. General pipeline data.......................................................................................... 5

2.2. Soil data ............................................................................................................... 5

2.3. Environmental data............................................................................................. 5

2.4. Content data ........................................................................................................ 5

3. METHODOLOGY ............................................................................................................. 7

3.1. Pressure strain due to end-cap effect............................................................... 8

3.2. Pressure strain due to Poissons effect............................................................ 8

3.3. Temperature strain.............................................................................................. 8

3.4. Friction strain ...................................................................................................... 8

4. RESULTS ......................................................................................................................... 9

5. PIPELINE EXPANSION ANALYSIS .............................................................................. 10



CPP3 COMPLEX


Page No.

3 of 13


1. INTRODUCTION

1.1. General

The objective of calculations presented in this document is to determine the free end expansion of the proposed production pipeline associated with the Ca Ngu Vang Pipeline Project due to the influence of pressure and temperature acting on production riser at CPP3 complex.

The methodology used to analyse the free end expansion of the pipeline system is based on the pipeline temperature and pressure.

The result of this document is important input for [3], to determine riser configuration and analyze riser stresses in operating case.

1.2. Definitions, symbols and abbreviations

Free-end point: The end-cap point.

Anchor point: The nearest point (from free-end point) is at this total strain is equal to zero.

Coefficient of linear thermal expansion for pipe steel. Ai Internal area of pipe.

As Steel area of pipe section.

E Elastic modulus of steel.

L Total expansion in pipeline. )(x Total strain at co-ordinate x.

1 Pressure strain due to end-cap effect. )(2 x Pressure strain due to Poissons effect at co-ordinate x. )(3 x Strain due to temperature at co-ordinate x. )(4 x Strain due to soil friction at co-ordinate x.

L The length from anchor point to free-end point.

Longitudinal friction coefficient of the seabed soil Pe External pressure.

Pi(x) Internal pressure at x co-ordinate.



CPP3 COMPLEX


Page No.

4 of 13


)(xcont Content density at x co-ordinate. Tp(x) Temperature of content at x co-ordinate.

Ta Installation temperature

Ws Submerged pipe weight.

x The co-ordinate of calculate point.

1.3. Reference documents

[1] Doc. No.3554310-10600-00001, Ca Ngu Vang filed development project - Design basis, rev3.

[2] Doc. No.3554430-20900-00001-C, primary design report - pipelines, rev C.

[3] Doc. 3554-ES-JA-008, Stress analysis for production riser, revA.



CPP3 COMPLEX


Page No.

5 of 13


2. DESIGN DATA

The basis of design and other calculations are now not available for the new option of this project (the pipeline from CNV platform to CPP3 complex).

So, the documents [1] and [2] have been used in this document.

2.1. General pipeline data

General design properties are taken on [2], and tabulated as below:

Pipeline DN250

Ouside steel pipe diameter 273.05 [mm]

Young's modulus 207000 [MPa]

Poissons ratio 0.3

Steel density 7850 [kg/m3]

Line pipe steel grade X65

2.2. Soil data

Soil type Medium sand

Longitudinal coefficient of the soil 0.5

2.3. Environmental data

Water depth 48.5 [m]

Water density 1025 [kg/m3]

Minimum ambient water temperature 21.78 [0C]

2.4. Content data

Content data includes content density profile, temperature profile and pressure profile are taken from Appendix 7 [2].



CPP3 COMPLEX


Page No.

6 of 13


In this appendix, worst scenario (the scenario with max pressure and temperature, is initial life choking at Bach Ho) chosen for expansion analysis.

It is noted that in the Appendix 7 [2] riser base at the Ca Ngu Vang platform chosen as origin position, so the expansion analysis data need to be converted to riser base at CPP3 platform as origin position. Moreover, SI unit system used in this document (data converted from U.S unit system to S.I unit system).

Results of convertion calculation presented in Section 5.



CPP3 COMPLEX


Page No.

7 of 13


3. METHODOLOGY

The methodology used to analyze the free end expansion of the pipeline system is based on the pipeline temperature and pressure.

TOTAL STRAIN VERSUS CALULATION POSITION

TOTA

L S

TRA

IN

dx x

PIPELINENo pipeline

motion Pipeline motion

L

ANCHORPOINT

FREEEND

DIS

PLA

CEM

EN

T

DISPLACEMENT OBTAINED BYINTEGRATING TOTAL STRAIN

0

0

L

L

In formulas presented below, expansion strain is positive.

The total strain of pipeline can be expressed by:

)()()()( 4321 xxxx +++= (1) The expansion length L, obtained by solving equation:



CPP3 COMPLEX


Page No.

8 of 13


0)( =x (2) The total pipeline expansion at free-end point obtained by:

= L dttL0

).( (3)

In addition, the total pipeline expansion at x co-ordinate obtained by:

= Lx

dttLxL ).()( (4)

3.1. Pressure strain due to end-cap effect

The "end-cap" effect causes constant strain along the entire length of the pipelines:

( )s

iei

AEAPP

..)0(

1= (5)

3.2. Pressure strain due to Poissons effect

This effect causes a longitudinal strain resulting from the Poisson effect due to the tensile hoop strain:

( )Et

DPxPx ei =.2

.)()(2 (6)

3.3. Temperature strain

The increase in temperature, for the operating condition, causes a longitudinal tensile strain:

( ) .)()(3 ap TxTx = (7) 3.4. Friction strain

The frictional strain linearly increases with increasing distance from the free-end point:

EAxWx

s

s

...

)(4 = (8)

All expansion calculations presented in Section 5, according to above methodology and calculation procedure.



CPP3 COMPLEX


Page No.

9 of 13


4. RESULTS

The result tabulated as below:

L [m] L [m] Production pipeline 4072 1.440

The result is important input for [3], to determine riser configuration and analyze riser stresses in operating case.

All detailed calculations presented in Section 5.

In-house development sheet used to expansion analysis according to the methodology presented inSection 3 "Methodology".

I. INPUT

1. Pipeline properties

Steel pipe outer diameter D 273.05 10 3:= m( )Pipe wall thickness twt 20.1 10

3:= m( )Corrosion coating thickness tcoat 0.5 10

3:= m( )Insulation coating thickness tinsu 33.0 10

3:= m( )Concrete coating thickness tconc 25.4 10

3:= m( )Steel desity steel 7850.0:= kg m 3( )Corrosion coating density coat 1400:= kg m 3( )Insulation coating density insu 345:= kg m 3( )Concrete coating desity conc 3044:= kg m 3( )Water density water 1025:= kg m 3( )

2. Steel and soil properties

Elastic modulus E 2.07 1011:= N m 2( )Thermal expansion coefficient 0.3:=Thermal expansion coefficient 1.17 10 5:=Longitudinal friction coefficient 0.5:=

3. Operating condition

Installation temperature Ta 21.78:= Celsius( )External pressure Pe 50 10

4:= N m 2( )



CPP3 COMPLEX


Page No.

10 of 13


5. PIPELINE EXPANSION ANALYSIS

Temperature, content desity and internal pressure from Appendix 7 [2]:

0.000 5.000 103 1.000 104 1.500 104454.000

455.000

456.000

457.000

458.000Content density profile

Kilo post from free-end point (m)

Con

tent

des

ity (k

g/m

^3)

0.000 5.000 103 1.000 104 1.500 1042.150 107

2.200 107

2.250 107

2.300 107

2.350 107Internal pressure profile


Inte

rnal

pre

ssur

e (N

/m^2

)

0.000 5.000 103 1.000 104 1.500 10475.000

80.000

85.000

90.000Temperature profile


Tem

pera

ture

(Cel

sius

)



CPP3 COMPLEX


Page No.

11 of 13


II. CALCULATION

1. Calculate submerged weight of pipe

Calculate diameters:

Inner diameter D0 D 2 twt:= D0 0.233=Outer steel pipe diameter: D1 D:= D1 0.273=Outer diameter to corrosion coating layer: D2 D1 2 tcoat+:= D2 0.274=Outer diameter to insulation coating layer: D3 D2 2 tinsu+:= D3 0.340=Outer diameter to concrete coating layer: D4 D3 2 tconc+:= D4 0.391=

Submerged pipe include:

mcont x( ) cont x( )

4 D02:= kg m 1( )

msteel steel

4 D12 D02 := msteel 125.386= kg m 1( )

mcoat coat

4 D22 D12 := mcoat 0.602= kg m 1( )

minsu insu

4 D32 D22 := minsu 10.982= kg m 1( )

mconc conc

4 D42 D32 := mconc 88.768= kg m 1( )

mwater water

4 D42:= mwater 122.980= kg m 1( )

Total submerged weight of pipe:

Ws x( ) 9.807 mcont x( ) msteel+ mcoat+ minsu+ mconc+ mwater( ):= N m 1( )2. Definitions of strain

Pressure strain due to "end-cap" effect: 1Pi 0( ) Pe( ) D02E D1

2 D02

:=

Pressure strain due to Poisson's effect: 2 x( )Pi x( ) Pe( ) D1

2twt E:=



CPP3 COMPLEX


Page No.

12 of 13


Strain due to temperature: 3 x( ) Tp x( ) Ta( ):=Strain due to soil friction: 4 x( )

Ws x( ) x

4D1

2 D02

E:=

Total strain:

x( ) 1 2 x( )+ 3 x( )+ 4 x( )+:=

3. Expansion analysis

Find the expansion length (we use x as a initial value in equation solving):

L x 500.0root x( ) x, ( )

:= L 4072.334= m( )

The total pipeline expansion at free-end point:

L0

Lx x( )

d:= L 1.440= m( )

The total expansion at x co-ordimate defined by follow function:

L x( )x

Lt L t( ) d:=

And, total pipeline expansion can be graph:

0 1 103 2 103 3 103 4 1030

0.5

1

1.5PIPELINE EXPANSION


Expa

nsio

n (m

)



CPP3 COMPLEX


Page No.

13 of 13


1. INTRODUCTION 1.1. General 1.2. Definitions, symbols and abbreviations 1.3. Reference documents 2. DESIGN DATA 2.1. General pipeline data 2.2. Soil data 2.3. Environmental data 2.4. Content data

3. METHODOLOGY 3.1. Pressure strain due to end-cap effect 3.2. Pressure strain due to Poissons effect 3.3. Temperature strain 3.4. Friction strain

4. RESULTS 5. PIPELINE EXPANSION ANALYSIS

3554 es ja 007 expansion assessment for production riser reva

Documents