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Chapter 2: Method of NDT - Coggle Diagram

- - - - For what condition:question:
        
        2) Presence of defects
        
        3) Surface roughness
        
        1) Surface condition
        
        4) Dimensional changes
  - - - Geometry
      - Measurement of surface roughness
    - - Defect and crack
      - Corrosion
    - - Inspect weld preparations
    - - Grinding defect
  - - - Allows inspection on the internal surfaces in piping and engine
    - - Permits the inspection in difficult and hazardous site such as nuclear installations and underwater pipe lines
    - - Using Strippable film permits the remote inspection of the surface
- - - - to reveal surface breaking flaws by bleed out of a colored or fluorescent dye from the flaw
    - - The ability of a liquid to be drawn into a 'clean' surface discontinuity
      - Flaw by capillary action
    - - The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.
    - - The tendency of a liquid to penetrate / migrate into a small opening such as cracks is due to capillary action
      - When a liquid wets a surface, the angle of contact or the wetting angle (defined as the angle between the contact surface and the tangent at the point of contact is less then 90 degree. Therefore, wettability reduce as the contact angle increase