Ultrasonic Testing : UT

1. Easy for detecting a plain type discontinuity.
2. Test is applicable from one side of objects.
3. Information of flaw's height, spreading along to wall thickness direction can be got.
4. Not disturbed to the thickness of thicker subjects.
5. Cost for testing is lower than RT(Radiographic Testing).

1. Surface condition is affected to test results.
2. Coupling medium must be applied on surface of subjects for testing
3. Generally, not evaluate the kind of discontinuity.
4. Skilled technician is required to conduct testing.

• JIS Z 3060:2002
• JIS Z 2344:1993
• ASME Sec. V

Magnetic Particle Testing : MT

1. Cost for testing is lower than other methods.
2. Easy for handling with portable devices.
3. Surface and near surface discontinuity can be detected.
4. Thinner coating covered a surface discontinuity is not disturbed for detecting by this method.

1. Limited to ferromagnetic materials.
2. Thicker coating must be removed before testing.
3. Post-Cleaning is necessary for rotating equipments to remove the particle.
4. Round type discontinuity is difficult for detection.
5. Magnetizing with perpendicular two direction is necessary for detection of each discontinuity.

• JIS G 0565:1992
• ASME Sec. V

Liquid Penetrant Testing : PT

1. Easy to apply in field testing when used portable set.
2. Easy to evaluate by visible indication appeared on tested surface.
3. Discontinuities with several direction can be detected at once.
4. Round type discontinuity can be detected easily.
5. No electric power is required except for lighting in dark room.

1. Required to remove the coating and foreign material inside a flaw completely before testing.
2. Careful application according to a test procedure is required for getting proper test results.
3. Temperature and humidity must be essential for testing.

• JIS Z 2343:2001
• ASME Sec. V

Eddy Current Testing : ET

1. High speed test is available.
2. Test is able to perform automatically.
3. Most economical method for tube inspection of a heat exchanger to detect local corrosion and erosion.

1. Non-relevant signal and noise are disturbed evaluation.
2. Kind, shape and dimension of discontinuity can not be identified from test results.
3. Generally, qualitative analysis with reference artificial flaws.

• JIS H 0502:1986

Radiographic Testing : RT

1. Less affected by the quality of materials and/or crystal structure of test objects.
2. Easy for evaluating the kind of discontinuity from test results.
3. Test result is remained as persuasive record.
4. Easy for detecting a superficial discontinuity.

1. Accessibility for both side of test object is required.
2. Plain type discontinuity like a crack, is not detected when the face has an angle (usually over 15 degree) to exposure direction of RT.
3. Comparatively, cost for testing is higher than others.

• JIS Z 3104:1995
• JIS G 0581:1999
• ASME Sec.V
• AWS D1.1

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