Power Plant Construction and QA/QC

Chapter 7 – Nondestructive Examination

Engineering Technology Engineering Technology DivisionDivision

2

Overview

Chapter 7 – Nondestructive Examination

• Nondestructive Examination

• Qualified Personnel

• Surface and Volumetric Types

• Radiographic Examination – Volumetric – RT

• Ultrasonic Examination – Volumetric – UT

• Liquid Penetrant Examination – Surface – PT

• Magnetic Particle Examination – Surface – MT

• Visual Examination – Subjective – VT

• Eddy Current Examination – Surface and Volumetric – ET

• Leak Testing – Surface – LT

• Acoustic Emission Examination - AE

3

Volumetric - Radiography

Chapter 7 – Nondestructive Examination

• Source Type – Gamma, X-Ray, Neutron

• Film Type – Speed

• Material Type - Density

• Material Thickness – Exposure Duration

4

Chapter 7 – Nondestructive Examination

Volumetric - Ultrasonic

• High Frequency Sound• Type of Defect• Type of Material• Beam Angle

5

Surface – Liquid Penetrant

Chapter 7 – Nondestructive Examination

• Multiple Types• Surface Finish• Temperature Sensitive• Process Dependent

6

Surface – Magnetic Particle

Chapter 7 – Nondestructive Examination

• Material Type - Ferrous• Different Processes – Dry, Wet• Type of Shot – Yoke, Head, Longitudinal• Powder Size - Granularity

7

Visual - Subjective

Chapter 7 – Nondestructive Examination

• Knowledge Based• Experience Dominated• Known Standards

8

Visual - Illusions

Chapter 7 – Nondestructive Examination

Are square A and B the same shade of

gray?

9

Chapter 7 – Nondestructive Examination

Visual - Illusions

Are they the same height?

10

Chapter 7 – Nondestructive Examination

Visual - Illusions

11

Chapter 7 – Nondestructive Examination

Visual - Illusions

12

Chapter 7 – Nondestructive Examination

Visual - Illusions

Waterfall

13

Chapter 7 – Nondestructive Examination

Visual - Illusions

14

Chapter 7 – Nondestructive Examination

15

Surface and Volumetric – Eddy Current

Chapter 7 – Nondestructive Examination

• Thickness Dependent

• Thick – Surface

• Thin - Volume

• Contact not needed

• Multiple Configurations

16

Questions?

Chapter 7 – Nondestructive Examination