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Articles by Mokhtar Che Ismail
Total Records ( 3 ) for Mokhtar Che Ismail
  Ainul Akmar Mokhtar and Mokhtar Che Ismail
  Corrosion Under Insulation (CUI) is found to be a major problem for insulated pipes as it becomes even worse as the pipes age increases. Gradual metal loss due to CUI may cause the pipe to leak or in the worst scenario, the pipe may rupture. The presence of small leak or rupture in lines may lead to a hazardous situation since the piping systems carry hydrocarbons or other process fluids. Hence, a proper inspection and maintenance program of these piping systems is crucial to maintain a safe and continuous operation. Corrosion and inspection engineers mostly are confronted with the problem of optimizing the inspection schedule for insulated piping systems due to the fact that most inspection/maintenance optimization models are based on the reliability models to predict the failure probability of the system. However, no reliability model was found within the literature that has currently been applied to insulated piping systems. This study presents a methodology for the estimation of the reliability of insulated piping systems containing corrosion defects. A probabilistic approach is adopted to this methodology and the associated variables are represented by normal probability distributions. First-order reliability method is employed for carrying out the reliability analysis due to the presence of nonlinearity in the limit-state function and also in the possible presence of non-normal variables. The methodology is applied to a real case study and the remaining useful life of the insulated pipe is assessed.
  Saeid Kakooei , Hossein Taheri , Mokhtar Che Ismail and Abolghasem Dolati
  The hydrogen-induced cracking (HIC) behavior of X70 pipeline steel was studied by means of Linear Polarization Resistance (LPR), hydrogen permeation tests, weight loss and Scanning Electron Microscopy (SEM). In this study, the dissolved H2S was created by chemical reactions in solution. The specimens were immersed into synthetic sea water saturated with H2S. The experimental results showed that the increase of exposure time and H2S concentration leads to an increase of the hydrogen content in X70 steel, which plays a key role in the initiation and propagation of HIC.
  Prema Sivanathan , Mokhtar Che Ismail and Kee Kok Eng
  Based on recent case study from petrochemical industry vessel leakage incident was taken to investigate failure of Chloride Induced Stress Corrosion Cracking (CISCC) of austenitic stainless steel 304. The objectives of this research was to investigate the reasons for CISCC failure of austenitic stainless steel 304. To simulate CISCC initiation of austenitic stainless steel 304 in different chloride concentration environment at ambient temperature. In this study, ASTM G-30 U-bend standard test method was used to evaluate factors that affect the CISCC of austenitic stainless steel 304. Total of 6 U-bend specimen were prepared with 200, 4000, 5000, 6000, 7000 and 8000 ppm of chloride concentrations. All these specimens were immersed in sodium chloride aqueous solutions for 8 months period to determine the parameters which leads to appearance of initiations crack mode. The laboratory experiment then repeated with the same specimens with 50,000 ppm chloride concentration for another 3 months. However, after cleaning the U-bend specimen and conducted dye penetrant inspection there were no appearance of initiation of crack found in any of specimens. Non-Destructive Testing (NDT) is one of assessment method used for detecting the CISCC susceptibility. The dye penetrant testing was used to identify the crack but invisible on the surface of the specimens. As a result, no initiation of crack found in this research from a metallurgical failure investigation of CISCC at ambient temperature. Thus, CISCC requires a long period exposure time for a rough surface finish of austenitic stainless steel 304 to form localized corrosions to lead the cracking mechanisms which is a complex process.
 
 
 
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