oil and gas transmission pipelines are critical items of infrastructure in providing energy sources to regions and countries. steel pipes are commonly used which can be subject to both internal and external corrosion. this paper presents an advanced nondestructive inspection technique for detection of oil-gas pipeline corrosion defect. the pulsed eddy current (pec) method has been successfully ...

In order to achieve integrated condition in the girth welding of high pressure natural gas transmission pipelines, the weld zones and its surrounding area should have good mechanical properties. Residual stresses are an important defect especially in the girth welding of the pipeline. In this study, two API X70 steel pipes (with spiral seam weld) of 56 inches outside diameter and 0.780 inch wal...

Carbon dioxide corrosion has been widely studied in the field and laboratory. It is recognized that flow regime and metallurgy are important factors that influence in-situ corrosion rates but there are relatively few documented case studies that are able to separate the individual contributions of corrosion, flow regime and metallurgy on the observed corrosion damage. This paper deals with fail...

To understand the behavior of corrosion films on X65 C-steel under CO2 conditions is paramount to identify formation and transformations products. This work presents chemical changes mechanical effects produced by pH flow through combination molecular techniques with imaging. Siderite, wustite magnetite were identified as products at neutral pH, which dissolved damaged low a 1m/s brine crystal ...

The fatigue performance of welded joints submarine pipelines is directly related to the safety and economic benefits structures. Considering limitations calculation, anti-fatigue design small-scale test in evaluation analysis pipeline life, this paper demonstrated feasibility, scientificity advancement full-scale technology engineering applications. Consequently, a system its applied for ZY-PFS...

Tingkah laku kakisan keluli karbon API 5L X65 dengan kehadiran bakteria penurun sulfat (SRB) dalam persekitaran CO2 adalah dikaji. Uji kaji yang dijalankan bagi meneliti tingkah ujian kehilangan berat dan analisis permukaan. Spesimen didedahkan kepada medium kawalan (tanpa konsortium bakteria) SRB selama 10 hari aliran gas berterusan. Biofilem, produk kedalaman lubang terhasil dicirikan mikrosk...

American Petroleum Institute (API) specifications for line pipes include several steel grades with wide range of mechanical properties and chemical composition. Almost all, large diameter pipes produced in the Kingdom conform to these specifications and the present demand of this market segment reaches to about 300,000 tons annually. Until recently, all material used in the Kingdom under these ...