IEEE 844-2000 pdf download IEEE Recommended Practice for Electrical Impedance, Induction, and Skin Effect Heating of Pipelines and Vessels
3.8 depth of current penetration: The thickness of a layer extending inward from the surface ofconductor that has the same resistance to dc as the conductor as a whole has to ac of a given frequency.
3.9 eddy current: Current that circulates in a metallic material as a result of electromotive forces induced bya variation of magnetic flux.
3.10 effective flux penetration (P): The distance into a pipeline or a vessel wall that the value of currentinduced by the magnetic field at the surface would have to penetrate in order to generate the same heat asgenerated by the actual induced current distribution in the wall.
3.11 extra flexible: Cable or conductor with a minimum flexibility of ASTM Class D stranding
3.12 ferromagnetic envelope: A pipe, tube, angle, or channel of ferromagnetic material used as a racewayto enclose a skin-effect cable.
3.13 ferromagnetic material: A material that, in general, exhibits hysteresis phenomena and whosepermeability is dependent on the magnetizing force.
3.14 ground detector: An instrument or equipment used for indicating the presence of a ground on anungrounded system.
3.15 ground leak/fault detector: A device that detects an abnormally low electrical resistance from anisolated electrical circuit to ground.
316 heat loss: A quantitative value of the rate of energy flow from a pipe, a vessel, or equipment to thesurrounding ambient.
3.17 heat sink: A part that conducts and dissipates heat away from the pipeline or the vessel. Heat sinks, asrelated to pipe heating systems, can be pipe supports, valve operators, etc.
3.18 hot zone: The parts of an induction susceptor heating system that operate at significantly elevatedtemperatures This includes the susceptor and load.
3.19 impedance heating: An electric heating system where the object to be heated generates heat as a resultof an ac current passing through it.
3.20 induction coil: A helical electrical conductor of one or more electrical turns, usually of a shapeconforming to that of the outside of the vessel, pipeline, or susceptor, in which time varying magnetic flux isproduced by an alternating flow of electrical current.
3.21 induction heating: The generation of heat in any conducting material by means of magneticflux-induced currents.
3.22 magnetic flux (0): A condition in a medium produced by a magnetomotive force such that whenaltered in magnitude, a voltage is induced in an electric circuit linked with the flux.
3.23 magnetic flux density (): Flux per unit area through an element of area normal to the direction offlux.
3.24 magnetic flux leakage: That portion of the total magnetic flux in a circuit that does not intercept thematerial that contains the magnetic flux doing the heating.
IEEE 844-2000 pdf download
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