Crack Analysis In Weld Joints Of Pipes In The Oil And Gas Industry
The idea and objective of this study is to analyze cracks that initiates in weld joints of pipes due to quenching phenomenon. The crack is analyzed using two Quality Control methods which are Mechanical Testing (MT) and Nondestructive Testing (NDT). The pipe material is as per API 5L Grade B and...
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| Format: | Monograph |
| Published: |
UTeM
2008
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| Online Access: | http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000048554 http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000048554 http://eprints.utem.edu.my/3700/1/Crack_Analysis_In_Weld_Joints_Of_Pipes_In_The_Oil_And_Gas_Industry_-_24_pages.pdf http://eprints.utem.edu.my/3700/2/Crack_Analysis_In_Weld_Joints_Of_Pipes_In_The_Oil_And_Gas_Industry_-_TA_460.M98.2008.pdf |
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| Summary: | The idea and objective of this study is to analyze cracks that initiates in weld joints of
pipes due to quenching phenomenon. The crack is analyzed using two Quality Control
methods which are Mechanical Testing (MT) and Nondestructive Testing (NDT). The
pipe material is as per API 5L Grade B and joined using Shielded Metal Arc Welding
(SMA W) which is common for Process Piping in the oil and gas industrial application.
The materials are prepared as- per ASME IX Welding Codes and Standards. In order to
initiate the crack formation, the quenching phenomenon is simulated using tap water at
post weld treatment. After the simulation process, NDT is conducted using Visual
Inspection (VI), Ultrasonic Testing (UT), Magnetic Partic1e Inspection (MPI) and Dye
Penetrant Testing (DP1) along with MT which is Hardness Test (HT), Charpy Impact
Test (CIT) and Bending Test (B1). The VI conducted has determined the post weld
temperature of the weld joint and the weld metal is the area with the highest temperature
folJowed by the Heat Affected Zone (HAZ) and the base metal. The quality control
testing conducted results no visible defects on the external surface of the pipes (face
weld) through VI, MPI and _DPT but the root weld has four main defects which. are
Incomplete Root Penetration, Concave Root, Root Undercut and Root Crnck determined
using UT. The MT conducted indicated that the properties of the welded pipe material
are affected. The weld metal and the face weld area have higher hardness value than the
base metal, HAZ and root weld. The CIT conducted results, the base metal has higher
toughness than the weld metal and HAZ. The face weld also has higher ductility than the
root weld when root and face BT is conducted. There are no visible cracks at the face
weld area because quenching process is only simulated at the internal surface of the weld
joint and has only affected the root weld. The properties of the pipe material are affected
due to the heat treatment that occurred from high temperature of SMA W process and
quenching simulation. |
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