offshore pipelines are an effective tool for transportation of oil and gas which are usually assembled by the use of girth welds. since flaws may naturally exist at such welds, fracture assessment of girth welded offshore pipelines is substantial. current fracture assessment procedures like bs 7910 consider identical material properties for the weld and the base metals. however the strength dif...

Offshore pipelines are an effective tool for transportation of oil and gas which are usually assembled by the use of girth welds. Since flaws may naturally exist at such welds, fracture assessment of girth welded offshore pipelines is substantial. Current fracture assessment procedures like BS 7910 consider identical material properties for the weld and the base metals. However the strength dif...

Girth weld defects in long-distance oil and gas pipelines are one of the main causes pipeline leakage failure serious accidents. Magnetic flux (MFL) is most widely used inline inspection methods for pipelines. However, it impossible to determine type girth defect via traditional manual analysis due complexity MFL signal. Therefore, an automatic image classification method based on deep convolut...

Abstract The main objective of our ongoing research is data collection for integrity management (IM) tasks, in other words pipeline system (PIMS), helping the transporting operators different decision situations. Either reserves girth welds after a long-term operation can be identified or with defects should repaired and/or replaced. From operators’ point view, cost-effective way; however, from...

Girth weld cracking is one of the main failure modes in oil and gas pipelines; girth weld cracking inspection has great economic and social significance for the intrinsic safety of pipelines. This paper introduces the typical girth weld defects of oil and gas pipelines and the common nondestructive testing methods, and systematically generalizes the progress in the studies on technical principl...

Abstract Maintaining minimum distance between repair and existing welds often becomes impractical due to the presence of compact layouts, original branches, nozzles, etc. on offshore structural elements, pipelines, piping. Although some international codes standards provide criteria for maintaining a proximity welds, most them lack technical justification in relation their effect integrity weld...

This study presents numerical simulations and experimental verification of a vibration-based damage detection technique. Health monitoring of a submerged pipe's girth-weld against an advancing notch is attempted. Piezoelectric transducers are bonded on the pipe for sensing or actuation purposes. Vibration of the pipe is excited by two means: (i) an impulsive force; (ii) using one of the piezoel...

Offshore pipelines are usually constructed by the use of girth welds, while welds may naturally contain flaws. Currently, fracture assessment procedures such as BS 7910 are based on the stress-based methods and their responses for situations with large plastic strain is suspicious. DNV-OS-F101 with limited modifications proposes a strain-based procedure for such plastic loads. In this paper 3D ...