United Flight 232. Mumbai pipeline tragedy. Bhopal Gas Tragedy

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1 Importance IfNDT were used here? United Flight 232 Railway accident Mumbai pipeline tragedy Gujrat bridge tragedy Bhopal Gas Tragedy

2 Index 1.Definition 2.Features of NDT 3.Methods of NDT Visual inspection Liquid Penetrant testing Magnetic Particle Testing Radiographic Testing Ultrasonic Testing 4.Applications 5.Conclusion 6.References

3 Definition The use of noninvasive techniques to determine the integrity of a material, component or structure or quantitatively measure some characteristic of an object. i.e. Inspect or measure without t doing harm.

4 Features Any complicated objects can be tested without disturbing its configuration. No effect on future use of test object. Higher accuracy of fault finding than any other methods. NDT can test faults deep inside the object. Potential low cost. On line testing.

5 Methods of NDT Visual inspection X-ray Ult Ultrasonic i Testing T ti Acoustic Emission Flux Leakage Laser Interferometry Acoustic Microscopy Liquid Penetrant q Magnetic Particle testing Thermography Eddy current Magnetic Testing

6 Six most common NDT M th d Methods Visual Liquid Penetrant Magnetic Ult Ultrasonic i Eddy Current X ray X-ray Liquid Penetrant X-ray Eddy current

Visual Inspection Most basic and common inspection method.

of large tanks and vessels, railroad tank cars, sewer lines.

7 Visual Inspection Most basic and common inspection method. Tools include fiberscopes, bore scopes, magnifying glasses and mirrors. Portable video inspection unit with zoom allows inspection of large tanks and vessels, railroad tank cars, sewer lines. Robotic crawlers permit observation in hazardous or tight areas, such as air ducts, reactors, pipelines.

Liquid penetrant method A liquid id with high h surface

part and allowed time to seep into surface breaking defects.

penetrant out the defect and spread it on the surface where

Visual inspection is the final step in the process.

8 Liquid penetrant method A liquid id with high h surface wetting characteristics ti is applied to the surface of the part and allowed time to seep into surface breaking defects. A developer (powder) is applied to pull the trapped penetrant out the defect and spread it on the surface where it can be seen. Visual inspection is the final step in the process. The penetrant used is often loaded with a fluorescent dye and the inspection is done under UV light to increase test sensitivity.

9 Magnetic Particle Testing The part is magnetized. Finely milled iron particles coated with a dye pigment are then applied to the specimen. These particles are attracted to magnetic flux leakage fields and will cluster to form an indication directly over the discontinuity. This indication can be visually detected under proper lighting conditions.

10 Magnetic Particle crack i di ti indication

Radiography The radiation used in radiography testing is a higher energy (shorter wavelength) version of the electromagnetic waves that we see as visible light.

11 Radiography The radiation used in radiography testing is a higher energy (shorter wavelength) version of the electromagnetic waves that we see as visible light. The radiation can come from an X-ray generator or a radioactive source. High Electrical Potential Electrons + - Radioactive Source Creates Radiation Radiation Radiation Penetrate sampleple p Exposure Recording Device

12 Film Radiography X-ray film The part is placed between the radiation source and a piece of film. The part will stop some of the radiation. Thicker and more dense area will stop more of the radiation. The film darkness (density) will vary with the amount of radiation reaching the film through the test object. = less exposure = more exposure

13 Eddy current testing Coil Coil's magnetic field Eddy currents Eddy current's magnetic field Conductive material

14 Eddyy current testing g Eddy current testing is well suited for detecting surface crack but can also be used to make electrical conductivity & coating thickness measurements.

15 Ultrasonic testing High frequency sound waves are introduced into a material and they are reflected back from surfaces or flaws. Reflected sound energy is displayed versus s time, and inspector can visualize a cross section of the specimen showing the depth of features that reflect sound. initial pulse crack echo back surface echo Oscilloscope, or flaw detector screen plate crack

16 Applications i)common applications:- Inspection of raw products. Inspection following secondary processing. In-service Damage inspection. ii)special applications:- Power plant inspection Wire rope inspection Storage tank inspection Aircraft inspection Jet engine inspection Rail inspection etc.

Inspection Following Secondary Processing Machining Welding

17 Common Applications 1.Inspection of raw products Forgings, Castings, Extrusions, etc. 2. Inspection Following Secondary Processing Machining Welding Grinding Heat treating Plating, etc. 3. Inspection of In service product Cracking Corrosion Erosion/Wear Heat Damage, etc.

18 Special Applications Power Plant inspection Aircraft inspection Wire rope inspection

19 Special Applications Jet engine inspection Rail inspection

20 Conclusion Looking towards the large importance and application of NDT is the great type of technology, which is going to increase worldwide and we are sure that there will not be a single manufacturing industry which will not use this technology. And also there are special education is present for NDT and its part of engineering curriculum now.

21 References Referred websites:- Thanks to, Amit Golait Poonam Kanojia Prof : Mrs. Kirti Agashe

Introduction to Nondestructive Testing. Outline

Introduction to Nondestructive Testing Outline Introduction to NDT Overview of Six Most Common NDT Methods Selected Applications Page 1 Definition of NDT The use of noninvasive techniques to determine