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Corrosion Monitoring & Inspection Glossary - G
Galvanic corrosion: Corrosion due to dissimilar materials being in the presence of an electrolyte.
Galvanic probe: Basically a zero resistance ammeter used to measure galvanic coupling across two dissimilar metals. Typically used for steel and brass in seawater applications and various atmospheric corrosivity probes..
Gathering Line: A pipeline that transports gas from a production facility, e.g. gas well, to a processing or compressor station prior to entry into the transmission pipeline.
Gauge Plate/Bend Plate Pig: A utility pig mounted with a flexible metal plate of a specified diameter less than the minimum internal diameter of the pipeline. Pipe bore restrictions less than the plate diameter or short radius bends will permanently deflect the plate material.
Gauging Pig: A utility pig mounted with a flexible metal plate, or plates, of a specified diameter less than the minimum internal diameter of the pipeline. Pipe bore restrictions less than the plate diameter or short radius bends will permanently deflect the plate material.
Gel Pig: A utility pig that is composed of a highly viscous gelled liquid, often used for pipeline cleaning.
Geographical Information System (GIS): A computer system capable of assembling, storing, manipulating, and displaying geographically referenced information.
Geometry Pig: A configuration pig designed to record conditions, such as dents, wrinkles, ovality, bend radius and angle, and occasionally indications of significant internal corrosion, by sensing the shape of the internal surface of the pipe.
Girth Weld: Circumferential weld joining two joints of pipe.
Girth Weld Cracks: Cracks in the weld or weld zone of the butt welds that connect sections of pipe.
Global Positioning System (GPS): The navigational system utilizing satellite technology to provide a user an exact position on the earth's surface.
Gouge: Local damage caused by mechanical or forceful removal of metal from a local area on the surface of the pipe that may work harden the pipe and make it more susceptible to cracking.
Gouging: The process of creating a zone of mechanical damage that includes cold working, residual stresses, plastic distortion, and (generally) moved or removed metal.
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