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Tafel plot: Graph of overpotential
versus logarithm of current in an electrochemical cell; thus, the slope is V/Log
(i).
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Tensile Stress: Stress
that elongates the material.
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Tenting: A tent-shaped
void formed along the longitudinal seam-weld or circumferential weld reinforcement
in a pipe when the external coating is not in continuous intimate contact with
the pipe and weld surfaces.
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Terrain Conditions: The
soil type, drainage, and topography at a given location.
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Testing: See hydrostatic
retesting.
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Thin layer activation (TLA):
Corrosion monitoring technique which provides a measure of the loss
of material from a previously irradiated metal through its drop in radioactivity.
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Tool:
A generic term signifying any type of instrumented tool
or pig.
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Transducer: A device for
converting energy from one form to another, for example, in ultrasonic testing,
conversion of electrical pulses to acoustic waves and vice versa.
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Transgranular cracking:
Mode of cracking that occurs across the crystallographic grain structure
of a metal.
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Transmission Line: A pipeline,
other than a gathering or distribution line, that transports gas from a gathering
or storage facility to a distribution center or storage facility; operates at
a hoop stress of 20% or more of the specified minimum yield strength of the
pipe; or transports gas within a storage field.
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Trap: Pipeline facility
for launching or receiving tools and pigs. See Launcher and Receiver.
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