Buried pipes are extensively used for oil transportation from offshore platforms. Under unfavorable loading combinations, the pipe’s uplift resistance may be exceeded, which result in excessive deformations and significant disruptions. This paper presents findings a series of small-scale tests performed on buried geogrid-reinforced sands, with measured peak being to calibrate advanced numerical...

A new eddy-current system based on low-noise magnetoresistive sensors has been developed to detect cracks and corrosion in thick, multi-layer metal structures. The new instrument has detected narrow slots as short as 6.3 mm, in the lowest layer of a stack of three aluminum plates totaling 25 mm in thickness. These flaws were detected through 19 mm of overlying aluminum, in spite of the presence...

The U.S. has more than 14 million miles of buried pipelines and utilities, many of which are in congested urban environments where several lines share the underground space. Errors in locating excavations for new installation or for repair/rehabilitation of existing utilities can result in significant costs, delays, loss of life, and damage to property (Sterling 2000). There is thus a clear nee...

-S 237 WELDING JOURNAL We depend in our everyday life on the performance of vast quantities of steel, which we use without giving it a second thought. This is possible because the material is reliable and cheap (weight for weight, some 1000 times cheaper than potato chips). Yet, there are remarkable technologies and sciences working behind the scenes to create ever better steels that can be ass...

Water wetting is a crucial issue in carbon dioxide (CO2) corrosion of multiphase flow pipelines made from mild steel. This study demonstrates the use of a novel benchtop apparatus, a horizontal rotating cylinder, to study the effect of water wetting on CO2 corrosion of mild steel in two-phase flow. The setup is similar to a standard rotating cylinder except for its horizontal orientation and th...

A numerical methodology is proposed for the calculation of transient electromagnetic interference induced by overhead high-voltage power lines in metallic structures buried soil—pipelines oil or gas transportation. series 2D finite element simulations was employed to sample harmonic response a given geometry section. The inverse Laplace transform results allowed obtaining time domain evolution ...

The importance of hydrogenase activity to corrosion of steel was assessed by using mixed populations of sulfate-reducing bacteria isolated from corroded and noncorroded oil pipelines. Biofilms which developed on the steel studs contained detectable numbers of sulfate-reducing bacteria (10 increasing to 10/0.5 cm). However, the biofilm with active hydrogenase activity (i.e., corrosion pipeline o...

In this paper, a stochastic approach is combined with field theory and circuit methods to study how the geometrical electrical properties of holidays (defects or pores in insulating coating) metallic pipeline influence probability exceeding current density limit for corrosion. Three-dimensional FEM simulations are conducted assess shape resistivity pore on computed spread resistance value. The ...