A to Z listing
Search this site
[C] [D] [E]
[F] [G] [H]
[I] [J] [K]
[L] [M] [N]
[O] [P] [Q]
[R] [S] [T]
[U] [V] [W]
[X] [Y] [Z]
Narrow Axial External Corrosion (NAEC):
Narrow, deep, axially oriented corrosion, often along a longitudinal seam
Nondestructive Evaluation (NDE):
The evaluation of results from nondestructive testing methods or
nondestructive testing techniques in order to detect, locate, measure, and evaluate
Nondestructive Testing (NDT):
The actual application of a nondestructive testing method or a nondestructive
Nondestructive Testing Method (NDT
Method): A particular method of nondestructive testing, such as radiography,
ultrasonic, magnetic testing, liquid penetrant, visual, leak testing, eddy current,
and acoustic emission.
Nondestructive Testing Technique
(NDT Technique): A specific way of utilizing a particular nondestructive
testing method that distinguishes it from other ways of applying the same nondestructive
testing method. For example, magnetic testing is a nondestructive testing method
while magnetic flux leakage and magnetic particle inspection are nondestructive
testing techniques. Similarly, ultrasonics is a nondestructive testing method,
while contact shear-wave ultrasonic and contact compression-wave ultrasonic
are nondestructive testing techniques.
Monitoring from the outside of the pipe or vessel wall without having to
gain access to the interior of the equipment.
A particle of foreign material in a metallic matrix. Usually the foreign
material is an oxide, sulfide, or silicate, but may be of any substance foreign
to the matrix.
A response recorded on a chart, data display, or record that comes from
a source outside the pipeline, such as foreign objects in the ditch.
Nucleate: Initiate the
growth of a crack.