Abstract
Oil flowlines, the first “pipeline” system connected to the wellhead, are pipelines that are 5 to 30.5 cm (two to twelve inches) in diameter, most susceptible to corrosion, and very difficult to inspect. Herein, an external corrosion detection sensor for oil and gas pipelines, consisting of a semicircular plastic strip, a flat dog-bone-shaped sacrificial metal plate made out of the same pipeline material, and an optical fiber with Fiber Bragg Grating (FBG) sensors, is described. In the actual application, multiple FBG optical fibers are attached to an oil and gas pipeline using straps or strips or very large hose clamps, and, every few meters, our proposed corrosion detection sensor will be glued to the FBG sensors. When the plastic parts are attached to the sacrificial metals, the plastic parts will be deformed and stressed; thus, placing the FBG sensors in tension. When corrosion is severe at any given pipeline location, the sacrificial metal at that location will corrode till failure and the tension strain is relieved at that FBG Sensor location, and therefore, a signal is detected at the interrogator. Herein, the external corrosion detection sensor and its design equations are described, and experimental results, verifying our theory, are presented.
Highlights
Pipelines are the most practical, economical, and safest way of transporting crude or refined oil and gas (O&G) around the world
Inspection (ILI) tool, and Hydrostatic Pressure Testing (HT) are four main pipeline integrity inspection techniques used by most O&G companies to detect external corrosion and assess if a corroded pipeline is safe to be in operation or not
The optical fibers are attached to the gasinvolves and oil a semicircular plastic component, a sacrificial dog-bone-shaped metal made from the same pipeline pipelines using zip ties, straps, or large hose clamps and our sensors are attached to the Fiber Bragg Grating (FBG) sensors
Summary
Pipelines are the most practical, economical, and safest way of transporting crude or refined oil and gas (O&G) around the world. Even all living creatures except flatworms, nematodes, and cnidarians have circulatory systems and use veins and arteries (pipelines) to transport blood, oxygen, and nutrients to their bodies. From time to time, rupture of the pipelines or veins and arteries can occur. Many living creatures and humans have a nervous system, which can detect rupture of veins and arteries when it occurs (acting as a health monitoring system) to warn humans of occurrence of such events, but such health monitoring systems are nonexistent in most O&G fields. An external corrosion detection sensor for O&G pipelines, consisting. The external corrosion detection sensor and its design equations are described, and experimental results, verifying our theory, are presented
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