Zelmati Djamel

Research Center In Industrial Technologies | CRTI

Considering corrosion rate during the remaining life assessment of aging pipelines is fundamental to calculate the interval between two consecutive inspections. A total of 798 internal and external corrosion defects have been detected, using the Magnetic Flux Leakage intelligent inspection tool, over 48 km of a pipeline length located in the west r...

The influence of the addition of molybdenum on the structure and corrosion behaviour of aluminium was studied using optical microscopy, scanning electron microscope (SEM), potentiodynamic polarization and electrochemical impedance spectroscopy. The results show that the addition of 15%wt molybdenum causes the precipitation of the AI 12 Mo intermeta...

The aim of this paper is to estimate the reliability of cracked pipeline steel grade API 5L X70 used for hydrocarbon transportation, by coupling a developed mechanical model, based in one hand on the simulation of cracked specimen, and an experimental result of tensile and charpy test, and in the other hand, based on a reliability model by using a...

All Magnetic phase transition in Iron Molybdate Nitride (FeMoN 2 ) has been studied within the framework of density-functional theory, using generalized gradient approximation (GGA) as exchange correlation functionals. In this study, we suppose that, under the application of pressure, a uni-axial out-of plane structure optimization were done, where...

In this work, the stress-strain field is estimated through the application of classical laminate theory. The composite material studied is a hybrid composite made from plant fibers and synthetic fibers. The law of mixtures was used, to identify, the elastic properties of the studied hybrid composite materials. The effect of fiber orientation on the...

In this paper, the effect of varying the number of layers for a fixed total thickness is investigated. In order to conserve the integrity and the safety of a multilayers composite structure, the search of the optimal number of layers in the cross section, induced the low stress-strain field intensity, is strongly recommended. Meanwhile, this study...

This work is a contribution in analyzing structure, tribological behavior and corrosion of AISI L6 hardened tool steel. Structural characterization and tribological behavior of steel were investigated using Optical Microscopy (OM), Scanning electron microscopy (SEM), wear testing by friction on a pin-on-disc Tribometer and corrosion by potentiodyna...

In this study, Anatase thin films of titanium dioxide (TiO[Formula: see text] are deposited by the Direct Current (DC) magnetron sputtering technique on glass substrate for future application in gas sensors. In our work, we focused and discussed the effect of various substrate temperatures [Formula: see text]C, [Formula: see text]C and [Formula: se...

The purpose of this work is to examine some points of views on the burst pressure standards assessment for a pipeline with internal and/or external corrosion defects. The proposed work contains three major parts. First, we used several analytical and numerical methods with the use of Ansys Software. The goal is presenting different aspects concerni...

This paper presents a probabilistic study to estimate the remaining lifespan of cracked steel pipeline by using the response surface technique. The purpose is to assess the reliability index of the high strength low alloy steel (HSLA) pipelines for a limit state function without closed-form. The implicit objective function is approximated by a poly...

Titanium dioxide (TiO2) is a non-toxic material and chemically stable. It has a high optical transmittance, electrical conductivity and high refractive index. It is widely used in many fields such as photo catalysis, electro catalysis. It can be used serves as self-cleaning coatings. Similarly, TiO2 can be used as bio-sensor coatings, biomedical ma...

analyser l’influence de l’orientation des fibres végétales

The present paper is a contribution in developing an engineering model expressing the evolution of tooth flank wear in polyamide spur gears as a function of number of cycles. The method is based on first observing the behavior of wear on tooth flanks in real test conditions. Then, progressive flank wear profiles are plotted in order to sort out the...

The probabilistic approach is the best way to give realistic answers for design and maintenance and it is considered as a powerful decision-making tool. In the present paper, assessment of the failure probability of corroded pipeline subjected to internal pressure is estimated by using the first order reliability method (FORM). Measurements of defe...

L’objectif visé par ce travail est la détermination des différents débits du système de refroidissement des adsorbeurs des tamis moléculaires de la centrale à oxygène. Il s’agit de deux débits d’eau nécessaires au refroidissement de l’air traversant la colonne de lavage en sens inverse au mouvement de l’air dans une colonne de lavage afin de le dés...

Despite the various engineering models existing for lifetime investigation of hydrocarbon steel pipelines under localized corrosion and crack defects there is still a lack of information about the correlation between the two main parameters characterizing the geometrical defect model, depth and length. So the aim of the present work is a contributi...

The demand of energy based on hydrocarbons, such as gas and oil, requires construction of more and more new pipelines. Therefore, the assessment of the remaining life of these pipeline structures became increasingly important to ensure the continuity of production and distribution operations. The reliability of these industrial facilities is largel...