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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 1 of 13
Doc. No. : SGA – L – CC – 50 – 002
CLIENT : MEDCO E & P LEMATANG
PROJECT TITLE : SINGA GAS DEVELOPMENT PROJECT
LOCATION : LEMATANG BLOCK, SOUTH SUMATERA
1 31-Mar-09 Issued for Approval
0 25-Aug-08 Issued for Review ASW SFL BHK
REV. NO. DATE DESCRIPTION PREP’D CHK’D APP’D
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 2 of 13
Doc. No. : SGA – L – CC – 50 – 002
REVISION CONTROL SHEET
REV. NO DATE DESCRIPTION
0 25-Aug-08 Issued for Review
1 31-Mar-09 Issued for Approval
Based on Transmittal No. SGA-T-IJKL-00030
IKPT Comment
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 3 of 13
Doc. No. : SGA – L – CC – 50 – 002
TABLE OF CONTENTS
1. INTRODUCTION 4
2. SCOPE 4
3. DEFINITIONS 4
4. ENVIRONMENTAL CONDITIONS 4
5. REFERENCE 5
6. DESIGN BASIS AND PIPELINE CHARACTERISTICS 5
7. DESCRIPTION OF LOAD CASES 7
8. PIPING SUPPORTS 8
9. STRESS ANALYSIS REPORT 9
ATTACHMENT
APPENDIX-1 COMPUTER PLOT AND STRESS ISOMETRICAPPENDIX-2 INPUT FILEAPPENDIX-3 STRESS RESULTAPPENDIX-4 RESTRAIN SUMMARYAPPENDIX-5 DISPLACEMENT REPORT
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 4 of 13
Doc. No. : SGA – L – CC – 50 – 002
1. INTRODUCTION
This document provides the report of Stress Analysis at critical area long of onshore Sales Gas Pipeline required for SINGA field in Lematang Block South Sumatera operated by Contractor, hereinafter referred as COMPANY.
The result of this Stress Analysis document will be used for pipe stress analysis.
2. SCOPE
This document provided modeling for stress and flexibility calculation for above ground & buried/underground pipeline section in Lematang South Sumatera for SINGA GAS DEVELOPMENT PROJECT. Flexibility stress analysis of the pipeline has been performed to achieve the followings:
To ensure that the above ground piping stress are within the allowable limit as per design code ASME B31.8
To make a sure that the under ground pipeline stress are within the allowable limit as per design code ASME B 31.8
To locate the special pipe supports requirement (if any) Optimize the pipe support location and the piping load on to the support To determine the anchor loads at both ends of the above ground piping
stress
3. DEFINITIONS
Within the contents of this Stress Analysis Procedure :
“COMPANY” means PT Medco E&P Lematang.“CONTRACTOR” means IKPT who is specifying/purchasing the equipment materials and services for and on behalf of the COMPANY”.
The “SUBCONTRACTOR” means PT. Kelsri, who has been subcontracted to perform the detailed engineering of Sales Gas Pipeline.
“CERTIFICATION AGENCY” is “Third Party Inspection Agency” appointed by PT Medco E&P Lematang
.4. ENVIRONMENTAL CONDITIONS
The climate is tropical monsoon, which is characterized by hot and humid condition throughout the year. There are two distinct seasons, the dry season and rainy season. The rainy season occurs from November to May and the dry season occurs from June to October.
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 5 of 13
Doc. No. : SGA – L – CC – 50 – 002
1. Temperature
2. Ambient Temperature
a. Maximum
b. Minimum
c. Average
3. Relative Humidity
a. Maximum
b. Minimum
c. Average
4. Soil Resistivity / Characteristics
5. REFERENCE
API 5L American Petroleum InstituteSpecification for Linepipe
ASME American Society of Mechanical EngineersB 31.8 Gas Transmission and Distribution Piping Systems
ANSI American National Standard Institute B16.9Factory-Made Wrought Steel Butt welding Fittings
SGA-G-GL-00-001 Engineering Design Basis
SGA-L-ES-00-002 Pipeline Data
6. DESIGN BASIS AND PIPELINE CHARACTERISTICS
To Perform Stress Analysis of pipeline should be prepared list of pipe characteristic and soil characteristics which is as follow :
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DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 6 of 13
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PIPE CHARACTERISTICS
Descriptions Unit Value
Design Pressure (P1) Psig 1330
Operating Pressure (P2) Psig 1050
Maximum Operating Pressure (mop) Psig 1194
Hydrotest Pressure (P3) Psig 1672 (1.4 x mop)
Design Temperature (T1) oF 170
Operating Temperature (T2) oF 120
Hydrotest Temperature (T3) oF 80
Avg. ambient temperature oF 80
Avg. Relative humidity % 83
Design life year Min 20
Design Factor - 0.5
Corrosion allowance inch 0.125
Resistivity of Soil Ohm-meter 0.35
Avg Ambient Soil Temperature (normal)
oF 70
Weight of Content/Density t/m3 0.97-1.98
SOIL CHARACTERISTICSRev 1
SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 7 of 13
Doc. No. : SGA – L – CC – 50 – 002
Descriptions Unit Value
Friction Coefficient Kg/cm 0.13 – 1.22
Soil Density t/m3 0.97 – 1.98
Burried Depth to Top of Pipe m 1.5
Friction Angle deg 1.1-17.2
Undrained Shear Strength Kg/cm2 0.43-1.87
7.DESCRIPTION OF LOAD CASES
7.1 Elementary Load Cases
Elementary load cases chosen as follows:
Thermal in Design Condition (T1)
Thermal in Service Condition (T2)
7.2 Combination Load Cases
Load combinations adopted for stress analysis of the piping line are as follows:
Sustained in Design Conditions (W+P1)
Sustained in Operating Conditions (W+P2)
Design Condition (W+T1+P1)
Service Condition (W+T2+P2)
7.3 Hydrotest
Load case for Hydrotest can be given as follow :
Sustain load (W + P3)
Operating load (W + T3 + P3)
Note :
W : Full weight
P1 : Design Pressure
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 8 of 13
Doc. No. : SGA – L – CC – 50 – 002
P2 : Operating Pressure
P3 : Hydrotest Pressure
T1 : Design Temperature
T2 : Operating Temperature
T3 : Water Temperature
7.4 Stress Limit Criterion
Stress constraints and limit are defined as follows:
SL : calculated stress for sustained loads
SE : calculated stress for thermal loads
Sy : Yield strength at ambient temperature
Slp : Longitudinal stress due to internal pressure
SB : Nominal bending stress in straight pipe
St : Longitudinal stress due to thermal expansion
SE + SL < Syield (OPE)
SL = Slp+SB < 0.75 Sy (SUS)
SE = sqrt (SB^2 + 4St^2) < 0.72 Sy (EXP)
7.5 Flange Leakage Check
7.6 Anchor Block
8. PIPING SUPPORTS
8.1 General
This section presents the type of piping supports to be used to keep the line system stress within the allowable limit and the summary of piping loads.
8.2 General Supports
The number and location of supports have been chosen to satisfy static free span requirement. Fix type and guide of support attached to the piping system is chosen to compensate elongation due to combined load both of design, operating and test condition.
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DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 9 of 13
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9. STRESS ANALYSIS REPORT
Toward to the pipeline, after the pig launcher area, before and after the LBCV at Kp. 16+000 & Kp. 32+000, and before the pig receiver, the pipes are buried to the ground. Due to temperature changes and pressure, buried pipe deforms laterally in areas immidiately adjacent to changes in directions (bends). In areas far from bends, the deformation is primarily axial.
Stress analysis of the piping has been carried out using a non linear computer program Caesar II Version 4.2. The pipeline has been modeled from pipeline anchor block area between buried pipe and above ground pipeline (at surface of the ground). Both the ends of above ground pipeline are anchored. Initially the number and the location of supports were chosen to satisfy the free span requirement. Environmental loads are ignored for static stress analysis.
Stress analysis is performed for different load cases defined in section 7.0 and found that the system stresses are within the allowable limit as per ASME B 31.8. The result summary of stresses has been presented in Table 9.1.1. until Table 9.3.2. Computer plot and the stress isometric have been presented in Attachment-1.
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 10 of 13
Doc. No. : SGA – L – CC – 50 – 002
Table 9.1.1. Summary of maximum stresses as per ASME B 31.8 at Pig Launcher (Above Ground) – Burried Pipe Sales Gas Pipeline
Load CaseLoad Case No.
@Node No.
Stress (Psi)Allowable Stress (Psi) Ratio
(%)SL SE Sy
SUS 1 (W+P1)
1 25 11143.6 45000 - - 24.76
SUS 2 (W+P2)
2 25 9153.0 45000 - - 20.34
SUS 3 (W+P3)
3 25 13574.9 45000 - - 30.17
EXP (T1) 4 70 137.7 - 43200 - 0.32
EXP (T2) 5 70 109.3 - 43200 - 0.25
OPE (W+T1+P1)
6 25 11013.3 - - 60000 18.36
OPE (W+T2+P1)
7 25 11040.1 - - 60000 18.40
OPE (W+T3+P3)
8 25 13562.3 - - 60000 22.60
Table 9.1.2. From calculated stress Pig Launcher – Burried Pipe SGP, the maximum operational condition load at Anchor Block will be given as follow:
Load Case @NodeForces (lb)
Fx Fy Fz
OPE (W+T1+P1) 70 -166 -278 -16
Table 9.1.3. From calculated stress Pig Launcher – Burried Pipe SGP, the maximum displacement report will be given as follow:
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 11 of 13
Doc. No. : SGA – L – CC – 50 – 002
Load Case @NodeTranslation (in) Rotation (deg)
Dx Dy Dz Rx Ry Rz
OPE (W+T1+P1) 8 -0.55 -0.02 0 0 0 0.012
Table 9.2.1. Summary of maximum stresses as per ASME B 31.8 at LBCV Kp. 16+000 and LBCV Kp. 32+000
Load CaseLoad Case No.
@Node No.
Stress (Psi)Allowable Stress (Psi) Ratio
(%)SL SE Sy
SUS 1 (W+P1)
1 120 12376.6 45000 - - 27.50
SUS 2 (W+P2)
2120
10386.0 45000 - - 23.08
SUS 3 (W+P3)
3120
14807.9 45000 - - 32.91
EXP (T1) 4120
16087.0 - 43200 - 37.24
EXP (T2) 5120
7884.0 - 43200 - 18.25
OPE (W+T1+P1)
6120
25874.9 - - 60000 43.12
OPE (W+T2+P1)
7120
18991.9 - - 60000 31.65
OPE (W+T3+P3)
7120
16111.8 - - 60000 26.85
Table 9.2.2. From calculated stress LBCV 16+000 & 32+000 SGP, the maximum operational condition load at Anchor Block will be given as follow:
Load Case @Node Forces (lb) Condition
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SINGA GAS
DEVELOPMENT PROJECT
SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 12 of 13
Doc. No. : SGA – L – CC – 50 – 002
Fx Fy Fz
OPE (W+T1+P1) 30 -41530 -6313 0 Design
OPE (W+T2+P1) 30 -20690 -3180 0 Operation
OPE (W+T3+P3) 30 -4607 -762 0 Hydrotest
Table 9.2.3. From calculated stress LBCV 16+000 & 32+000 SGP, the maximum displacement report will be given as follow:
Load Case @NodeTranslation (in) Rotation (deg)
Dx Dy Dz Rx Ry Rz
OPE (W+T1+P1) 109 -0.14 -0.87 0 0 0 0.018
Table 9.3.1. Summary of maximum stresses as per ASME B 31.8 at Burried Pipe - Pig Receiver (Above Ground) SGP
Load CaseLoad Case No.
@Node No.
Stress (Psi)Allowable Stress (Psi) Ratio
(%)SL SE Sy
SUS 1 (W+P1)
1 80 11378.5 45000 - - 25.29
SUS 2 (W+P2)
2 80 9387.9 45000 - - 20.86
SUS 3 (W+P3)
3 80 13809.9 45000 - - 30.69
EXP (T1) 4 50 4515.5 - 43200 - 10.45
EXP (T2) 5 50 3583.8 - 43200 - 8.30
OPE (W+T1+P1)
6 50 13506.3 - - 60000 22.51
OPE (W+T2+P1)
7 50 12670.4 - - 60000 21.12
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SALES GAS PIPELINE STRESS ANALYSISJob No. : 07001 13 of 13
Doc. No. : SGA – L – CC – 50 – 002
OPE (W+T3+P3)
8 50 13789.5 - - 60000 22.98
Table 9.3.2. From calculated stress Burried Pipe - Pig Receiver (Above Ground) SGP, the maximum operational condition load at Anchor Block will be given as follow:
Load Case @NodeForces (lb)
Fx Fy Fz
OPE (W+T1+P1) 50 1354 -97 6408
Table 9.3.3. From calculated stress LBCV 16+000 & 32+000 SGP, the maximum displacement report will be given as follow:
Load Case @NodeTranslation (in) Rotation (deg)
Dx Dy Dz Rx Ry Rz
OPE (W+T1+P1) 2 -0.68 0 0 0 0 0
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