by csztroin csztroin

Volume 3:  Verifying the Quality of Coating Installation-Post Application is the third eBook in the Three Volume eBook series Inspection Instruments for the Pipeline Coatings Industry 

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This self-study course is in eBook format.  After reading this eBook, participants should be able to successfully:

Holiday detection

  1. Describe the difference between a pinhole and a holiday
  2. Explain common causes of pinholes and holidays
  3. Identify the coating thickness threshold that determines when low voltage and high voltage holiday detection is selected.
  4. Describe the basic property of a coating for holiday detection to be meaningful.
  5. Describe the basic property of the substrate for holiday detection to be meaningful.
  6. Describe the proper use of a low voltage (wet sponge) holiday detector.
  7. Describe the procedure for verifying continuity of a low voltage (wet sponge) holiday detector.
  8. Explain the purpose of adding a wetting agent to the water prior to saturating the sponge.
  9. List two factors to consider when selecting the proper test voltage for inspecting a coating using a high voltage holiday detector.
  10. Calculate the correct voltage setting when using a high voltage holiday detector.
  11. Identify that maximum rate at which the wetted sponge or electrode is scanned across the coated surface.
  12. Describe the procedure for verifying continuity of a high voltage holiday detector.

 

Hardness

  1. Explain the purpose of testing the hardness of a coating on a pipe.
  2. Describe the type of Durometer (Shore scale) that is typically used to test thick film epoxy pipe coatings.
  3. Describe the proper use of an analog hardness tester.
  4. Describe the proper use of a digital hardness tester.
  5. Explain the unit of measure related to hardness testing.
  6. Describe the procedure for verifying the accuracy of a Durometer.
  7. Identify the minimum number of hardness readings to obtain per area.

 

 

Adhesion

  1. Explain the difference between tensile adhesion and shear adhesion.
  2. Differentiate between an adhesive and cohesive break in a coating system.
  3. Differentiate between two test protocols for pull-off adhesion testing, including “test to fracture” and “test to failure.”
  4. Explain why scoring the coating is not recommended for thin film coatings.
  5. List two situations that may require scoring of the coating prior to pull-off adhesion testing.
  6. List two alignment processes of pull-off adhesion testers.
  7. List three methods of applying tensile force using portable adhesion testers.
  8. Explain how to determine whether concave or convex loading fixtures should be used instead of flat loading fixtures.
  9. Identify the most common diameter loading fixture for determining the pull-off adhesion coatings on steel.
  10. Identify the maximum pull-off rate in psi/second specified by ASTM D4541.
  11. Identify the minimum number of replicates per area prescribed by ASTM D4541 to characterize the adhesion properties of a coating.
  12. Rate the adhesion properties of a coating using a utility knife.

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