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Tafel plot: Graph of overpotential
versus logarithm of current in an electrochemical cell; thus, the slope is V/Log
Tensile Stress: Stress
that elongates the material.
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.
Terrain Conditions: The
soil type, drainage, and topography at a given location.
Testing: See hydrostatic
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.
A generic term signifying any type of instrumented tool
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.
Mode of cracking that occurs across the crystallographic grain structure
of a metal.
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.
Trap: Pipeline facility
for launching or receiving tools and pigs. See Launcher and Receiver.