Non Destructive Examination ( Nde )

1729 WordsOct 4, 20167 Pages
1 Introduction 1.1 Non-Destructive Examination (NDE) Non-destructive Examination (NDE) often referred to as Non-destructive Testing (NDT), is the term given to a range of techniques that are used to investigate the properties of a material without causing lasting damage to the material. These techniques are used over a large range of industries and are particularly useful throughout the lifecycle of a pipeline. A particular use of NDE is for the location and investigation of defects within a material, which can be used to investigate the structural integrity of a pipeline. 1.2 Pigging A pig is a man made mechanical device that travels along the inside of a pipeline carrying out a number of tasks, this is known as pigging. Originally pigs were designed to remove deposits that built up on the inside of pipelines that would eventually result in blockages. However pigs have now been developed to carry out far more tasks and are used during multiple stages of the pipeline’s lifecycle. 2 Traditional NDE Techniques The technique for NDT depends on the type of defect we are interested in examining. Generally, defects can be classified into 2 broad categories: Defects Surface Breaking ( those which can be seen on the surface of the material ) Embedded (those which are entirely within the body of the material) In order to examine Surface-Breaking defects there are three practices that are applied most commonly: 2.1    Visual Inspection Techniques Ultrasonic Inspection
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