Deepwater and ultra-deepwater oil gas exploitation might be challenge due to the fatigue damage at touchdown zone (TDZ). Therefore, development of risers with thicker pipe ends (upset end) is a solution diminish issues related through reducing average axial stress. In current study, manufacturing an upset end was carried out by friction welding in API X65 PLS2 steel outer diameter 220 mm. Consi...

The propagation of localized corrosion on API 5L X65 carbon steel in hydrogenocarbonated solution containing chloride ions was monitored during long immersion times by electrochemical noise (EN) measurements ZRA mode. Monitoring from the EN amplitude is possible but interpreting potential and current transients after made difficult different processes (metastable or stable pits, crevices, produ...

This research studies the effect of normalization on ductility and corrosion resistance API 5L X65 pipe. Normalization conducted at a temperature 900 °C with holding time 30, 60, 90, 120, 150 minutes, followed by cooling down to room using an external air. Corrosion testing normalized specimens was performed seawater as corrosive environment, -and were also tested for microhardness determine th...

In this research, a radial basis function artificial neural network (RBF-ANN) model was developed to predict the hot deformation flow curves of API X65 pipeline steel. The results of the developed model were compared with the results of a new phenomenological model that has recently been developed based on a power function of Zener-Hollomon parameter and a third order polynomial function of str...

Near-neutral pH and a low redox potential are considered favorable conditions for immobilizing radionuclides in deep repository systems within clay formations. Cigeo is the future French Industrial Center Geological Disposal high- intermediate-level long-lived radioactive waste, to be built at depth of 500 m Callovian–Oxfordian clay. In-depth knowledge mechanisms kinetics corrosion occurring on...