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Narrow Axial External Corrosion (NAEC):
Narrow, deep, axially oriented corrosion, often along a longitudinal seam
weld.
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Nondestructive Evaluation (NDE):
The evaluation of results from nondestructive testing methods or
nondestructive testing techniques in order to detect, locate, measure, and evaluate
anomalies.
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Nondestructive Testing (NDT):
The actual application of a nondestructive testing method or a nondestructive
testing technique.
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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.
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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.
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Nonintrusive Monitoring:
Monitoring from the outside of the pipe or vessel wall without having to
gain access to the interior of the equipment.
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Nonmetallic Inclusion:
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.
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Non-Relevant Indication:
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.
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Nucleate: Initiate the
growth of a crack.
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