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:
- Describe the difference between a pinhole and a holiday
- Explain common causes of pinholes and holidays
- Identify the coating thickness threshold that determines when low voltage and high voltage holiday detection is selected.
- Describe the basic property of a coating for holiday detection to be meaningful.
- Describe the basic property of the substrate for holiday detection to be meaningful.
- Describe the proper use of a low voltage (wet sponge) holiday detector.
- Describe the procedure for verifying continuity of a low voltage (wet sponge) holiday detector.
- Explain the purpose of adding a wetting agent to the water prior to saturating the sponge.
- List two factors to consider when selecting the proper test voltage for inspecting a coating using a high voltage holiday detector.
- Calculate the correct voltage setting when using a high voltage holiday detector.
- Identify that maximum rate at which the wetted sponge or electrode is scanned across the coated surface.
- Describe the procedure for verifying continuity of a high voltage holiday detector.
- Explain the purpose of testing the hardness of a coating on a pipe.
- Describe the type of Durometer (Shore scale) that is typically used to test thick film epoxy pipe coatings.
- Describe the proper use of an analog hardness tester.
- Describe the proper use of a digital hardness tester.
- Explain the unit of measure related to hardness testing.
- Describe the procedure for verifying the accuracy of a Durometer.
- Identify the minimum number of hardness readings to obtain per area.
- Explain the difference between tensile adhesion and shear adhesion.
- Differentiate between an adhesive and cohesive break in a coating system.
- Differentiate between two test protocols for pull-off adhesion testing, including “test to fracture” and “test to failure.”
- Explain why scoring the coating is not recommended for thin film coatings.
- List two situations that may require scoring of the coating prior to pull-off adhesion testing.
- List two alignment processes of pull-off adhesion testers.
- List three methods of applying tensile force using portable adhesion testers.
- Explain how to determine whether concave or convex loading fixtures should be used instead of flat loading fixtures.
- Identify the most common diameter loading fixture for determining the pull-off adhesion coatings on steel.
- Identify the maximum pull-off rate in psi/second specified by ASTM D4541.
- Identify the minimum number of replicates per area prescribed by ASTM D4541 to characterize the adhesion properties of a coating.
- Rate the adhesion properties of a coating using a utility knife.