Abstract To reliably assess the quality of welds in large-diameter water supply pressure steel pipes, this study investigates non-destructive testing methods for evaluating weld stability. Based on the detection principles of ultrasonic time-of-flight diffraction (TOFD) technology, this technique is applied to the...

Abstract: Austenitic stainless steel pipelines are extensively used in the nuclear and petrochemical industries because of their excellent corrosion resistance and long service life, making them suitable for the safe transport of a wide range of liquids and gases. However, the performance of the same pipeline...

1.3 Rolling Methods for Seamless Steel Tubes 1.3.1 Automatic Tube Mill In an automatic tube mill line, the automatic mill functions as the primary rolling unit, supported by an elongator as an auxiliary mill, and a three-roll sizing mill to enhance the wall thickness accuracy and roundness of the hollow shell. The basic...

Abstract: Corrosion in offshore oil and gas pipelines is directly influenced by the marine environment and the effectiveness of corrosion protection measures. Key factors contributing to offshore pipeline corrosion include seawater salinity, ocean currents, oil and gas composition, and internal chemical reactions. Corrosion...

2. Pipeline Welding Standards Pipeline welding standards are essential for advancing modern welding technologies and ensuring standardized, safe, and reliable pipeline construction. Today, welding standards have evolved into a comprehensive system with detailed requirements for welding procedures, techniques, and...

3.2 Environmental Factors 3.2.1 Temperature Temperature is the most critical environmental factor influencing CO₂ corrosion, as it affects the dissolution, precipitation, and composition of the corrosion product film, thereby altering the overall corrosion process. At low temperatures (≤60 °C), the dissolution rate...

Abstract Plastic pipes are playing an increasingly important role in industrial applications. This article explores the selection and design of commonly used plastic pipe materials, focusing on key factors such as operating temperature, corrosion resistance, industry standards, pressure and temperature ratings, valve...

Abstract Carbon steel pipes are widely used in submarine oil and gas exploration projects worldwide due to their proven design for pipeline installation. However, in environments with rugged seabeds and variable geological conditions, carbon steel pipes encounter major challenges. This paper analyzes these limitations,...

Abstract Oil well pipes are essential components in oil and gas exploration and development; however, corrosion remains a critical global issue. This study provides an overview of current research on oil well pipe corrosion in China, focusing on two key aspects: service environments and corrosion mechanisms. It reviews...

Abstract A boiler tube experienced a burst. The failed tube was analyzed using metallographic microscopy, direct-reading spectroscopy, and scanning electron microscopy. The analysis revealed that the steel pipe underwent hydrogen-induced corrosion under high temperature and pressure, leading to the formation of extensive...

Technical Standards for Pipeline Steel There are two primary types of straight-seam welded pipes used in high-pressure oil and gas pipelines worldwide: straight-seam submerged arc welded (SAW) pipes (with pipe diameters of 400 to 1400 mm, wall thicknesses of 8 to 40 mm, and the highest grade being X80) and high-frequency...

Pipeline pigging operations are gaining increasing attention. Various technical problems may arise during the pipeline pigging process. During the pre-inspection pigging of a natural gas pipeline, it was discovered that the foam pigging was damaged for unknown reasons. After further diameter measurement pigging, arc...