BK4A-001-TS-TP2-RPT-04_26 Inch Pipeline Wall Thickness Calculation Report_1_100414

MODIFICATION AT WHITE TIGER FIELD TO RECEIVE GAS FROM THIEN UNG, DAI HUNG FIELDS BK4A PLATFORM 26" PIPELINE WALL THICKNESS CALCULATION REPORT

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TABLE OF CONTENT 1.0 

INTRODUCTION .......................................................................................................................... 3 

2.0 

GENERAL INFORMATION AND REQUIREMENTS ................................................................. 3 

2.1 

LANGUAGUES AND UNIT OF MEASURES .............................................................................. 3 

2.2 

PURPOSE OF DOCUMENT........................................................................................................ 3 

2.3 

ABBREVIATIONS ........................................................................................................................ 3 

3.0 

DESIGN DATA............................................................................................................................. 4 

3.1 

GENERAL .................................................................................................................................... 4 

3.2 

PIPELINE DATA .......................................................................................................................... 4 

4.0 

METHODOLOGY ......................................................................................................................... 5 

5.0 

RESULTS ..................................................................................................................................... 6 

6.0 

REFERENCE DOCUMENTS....................................................................................................... 6   

MODIFICATION AT WHITE TIGER FIELD TO RECEIVE GAS FROM THIEN UNG, DAI HUNG FIELDS BK4A PLATFORM 26" PIPELINE WALL THICKNESS CALCULATION REPORT

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INTRODUCTION The BK-4A riser platform is located in the White Tiger Oil Field, approximately 145km SouthEast of Vung Tau City of Vietnam. The BK-4A riser platform is connected to the existing BK4 platform via linking bridge. The BK-4A riser platform consists of topside and jacket. It is able to receive gas - condensate at low pressure condition from the Thien Ung Platform (BK-TNG) via NCS-2 pipeline (phase 1) and transport to BK-4 riser platform via linking bridge. One Pig receiver 26" is installed on the topside of BK-4A platform to receive pig launched from BK-TNG platform via the NCS-2 pipeline (Phase 1).

2.0

GENERAL INFORMATION AND REQUIREMENTS

2.1

LANGUAGUES AND UNIT OF MEASURES The content, references, attachments and any supplementary information for all engineering documents shall be in English unless specified otherwise. Units of measurement for all engineering documents shall be in the System International (SI).

2.2

PURPOSE OF DOCUMENT The purpose of this document is to present the methodology and results of the minimum wall thickness design calculation for the offshore pipeline from hanger flange of riser to pig receiver in accordance with ASME B31.8.

2.3

ABBREVIATIONS The following abbreviations will be used throughout this document: API

American Petroleum Institute

HAT

Highest Astronomical Tide

Hmax

Maximum Wave Height

ID

Inside Diameter

KP

Kilometer Post

LAT

Lowest Astronomical Tide

LRFD

Load and Resistance Factor Design

MSL

Mean Sea Level

OD

Outside Diameter

PSL

Product Specification Level

MODIFICATION AT WHITE TIGER FIELD TO RECEIVE GAS FROM THIEN UNG, DAI HUNG FIELDS BK4A PLATFORM 26" PIPELINE WALL THICKNESS CALCULATION REPORT

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Ref.

Reference

Rev

Revision

RP

Return Period

SMLS

Seamless Pipe

SMTS

Specified Minimum Tensile Strength

SMYS

Specified Minimum Yield Strength

WD

Water Depth

WHP

Wellhead Platform

WT

Wall Thickness

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DESIGN DATA

3.1

GENERAL This section presents the relevant design data used for the pipeline wall thickness calculation.

3.2

PIPELINE DATA The design parameters for the pipeline systems are presented under Table 3.1 below. Table 3.1- Pipeline Design Parameter Description

Data

Line pipe Outer Diameter

653.6 mm/ 26-inch

Line pipe material grade

API 5L X60, PSL2, LSAW

SMYS

415 MPa

SMTS

520 MPa

Steel density Elastic modulus Poisson ratio Design pressure External Pressure

7850 kg/m3 207000 MPa 0.3 45 barg 0 barg (conservative result)

MODIFICATION AT WHITE TIGER FIELD TO RECEIVE GAS FROM THIEN UNG, DAI HUNG FIELDS BK4A PLATFORM

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26" PIPELINE WALL THICKNESS CALCULATION REPORT

Description

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Data

Minimum

-29 °C

Maximum

85 °C

Design temperature Internal corrosion allowance for pipeline and riser

3 mm

Design Factor (Hoop/ Longitudinal/ Von Mises)

4.0

0.5/ 0.8/ 0.9

METHODOLOGY The wall thickness calculations are performed in accordance with ASME B31.8-2010, Clause 842.2.2.

S h  F1 ST S h  ( Pi  Pe )

D 2t

Where: Pi

=

Internal pressure (MPa)

Pe

=

External pressure (MPa)

D

=

Pipe outside diameter

t

=

Nominal wall thickness

Sh

=

Hoop stress (MPa)

F1

=

Design factor (Refer to Ref [2], Table A841.1.6-1)

S

=

Specified Minimum Yield Strength (MPa)

T

=

Temperature de-rating factor (Refer to Ref [2], Table A841.1.8-1)

Required wall thickness:

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t req  t  t CA Where:

t CA

=

Internal corrosion allowance thickness (mm)

The value of 12.5% for mill tolerance shall be considered to account for proposed pipe wall thickness. 5.0

RESULTS The results of the pipeline wall thickness calculation are presented in Table 5.1. The calculation sheet for pipeline wall thickness design is attached under Appendix 1. Table 5.1- Selected Wall Thickness Pipeline from Hanger Flange of Riser to Pig Launcher/Receiver

Pipeline Section

Calculated Wall Thickness (mm)

Corrosion Allowance (mm)

Required Wall Thickness (mm)

Selected Wall Thickness (mm)

From Hanger Flange of Riser to Pig Launcher/Receiver

7.09

3.0

10.09

15.9 (1)

Note: 1.

6.0

The selected wall thickness is based on API 5L, 2004. This wall thickness is recommended to same as riser section.

REFERENCE DOCUMENTS [1].

API 5L, Specification for Line Pipe, 44th Edition, 2007.

[2].

ASME B31.8, Gas Transmission and Distribution Piping Systems, 2010

MODIFICATION AT WHITE TIGER FIELD TO RECEIVE GAS FROM THIEN UNG, DAI HUNG FIELDS BK4A PLATFORM 26" PIPELINE WALL THICKNESS CALCULATION REPORT

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Wall Thickness Calculation for Pipeline from Hanger Flange of Riser to Pig Receiver (03 Pages – Including this page)

APPENDIX 1- WALL THICKNESS CALCULATION FOR PIPELINE FROM HANGER FLANGE OF RISER TO PIG LAUNCHER/RECEIVER Project No.: Contract No: Client: Vietsovpetro Joint Venture (VSP) Project: Modification at White Tiger Field to Receive Gas From Thien Ung, Dai Hung Fields BK4A Platform Subject: Wall Thickness Calculation per ASME B31.8-2010 Calculation Objective To calculate and determine the wall thickness of pipeline as per ASME B31.8-2010 The analyzed case is a part of 26" offshore pipeline from hanger flange of riser to pig receiver

Calculation Method Wall thickness is calculated in accordance with ASME B31.8 Clause 842.2.2 The calculated minimum thickness is rounded up to next standard thickness as per API 5L

Reference ASME B31.8, 2010 - Gas Transmission and Distribution Piping Systems API 5L, 2007- Specification for Line Pipe, 44th Edition

Conclusions The selected wall thickness for Modification at White Tiger Field to Receive Gas From Thien Ung, Dai Hung Fields BK4A Platform satisfies the requirement of B31.8 for offshore gas pipeline pipeline. Based on detailed calculation, it's recommended to select wall thickness for entire offshore gas pipeline is 15.9 mm

Project Title: Client: Calculation Title: Calculation No.:

Modification At White Tiger Field To Receive Gas From Thien Ung, BK4A Platform VietsovPetro

INPUTS Material Material Grade Yield Strength Corrosion Allowance

SMYS CA

API 5L - X60 415 MPa 3.0 mm

F T

Riser 0.5 1.0

-

Fluid Density

ρ cont

20.4

kg/m3

Density of Water Design Pressure (gauge) Inlet Pressure Ref. Elevation Gravitational Acceleration

ρwater Pd h ref g

1025.0 4.5 0.0 9.81

kg/m3 MPa m

Minimum Elevation @ LAT

h min

0.0

m/s2 m

Pt Ft

5.50 0.9

MPa -

Location Location (Pipeline/Riser) Design Factor Temperature Derating Factor

Pipe Manufacture LSAW

Material Grade API 5L -X60

Load

Hydrotest Hydrotest Pressure Design Factor for Test

Ref.: ASME B31.8 Clause A842.2.2 & Table A842.2.2-1 The nominal wall thickness is calculated as a function of the design pressure, design temperature pipe manufacture type and pipe material.

OUTPUTS RESULTS Pipe Size, DN

650

Minimum External Hydrostatic Pressure Pipeline Internal Static Head Internal Pressure Effective Pressure Pipe Outer Diameter Calc. Wall Thickness Nominal Wall Thickness Selected Wall Thickness VERIFICATION Pipe Size, DN

Pe P head Pi Pi - Pe D t tn t chosen

MPa MPa MPa MPa mm mm mm mm

Operation 0.00 0.00 4.50 4.50 653.6 7.09 10.09 15.90

Hydrotest 0.00 0.00 5.50 5.50 653.6 4.81 4.81 15.90

t chosen t fab t cal h Sh -

mm mm mm MPa MPa -

Operation 15.90 1.99 10.91 207.50 132.5 41.11

Hydrotest 15.90 1.99 13.91 373.50 126.4

650

Selected Wall Thickness Mill Tolerance Thickness Calculated Wall Thickness Allowable Hoop Stress Hoop Stress D/tn Ratio