Volume 2: Verifying the Quality of Coating Application

Volume 2:  Verifying the Quality of Coating Application is the second 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:

Ambient Conditions

  1. List the prevailing ambient conditions that are most commonly assessed prior to mixing and application of coatings.
  2. Describe the consequences of applying coatings outside of acceptable conditions.
  3. Explain the relationship between the dew point temperature and surface temperature.
  4. Identify the minimum delta between the surface temperature and dew point temperature.
  5. Describe the frequency and location in which ambient conditions are typically measured.
  6. Describe the proper use of a whirling (sling) psychrometer.
  7. Describe the procedures used to look-up relative humidity & dew point temperature using psychrometric charts.
  8. Explain the importance of acclimation of digital (electronic) psychrometers.
  9. Describe a common procedure for verifying the accuracy of thermometers.
  10. Identify the frequency of calibration recommended by most manufacturers of digital psychrometers.

Coating Temperature

  1. List two characteristics of a mixed coating that are based on the temperature of the material.
  2. List three type of instruments that can be used to measure paint temperature

Calculating WFT

  1. Describe the effect on the volume solids content of a coating when it is thinned.
  2. Explain the value of measuring the wet film thickness during application of a coating.
  3. List three values that are used to calculate the target wet film thickness.
  4. Calculate the target wet film thickness of an unthinned coating.
  5. Calculate the target wet film thickness of a thinned coating.
  6. Determine the “practical” volume solids content of a coating using a wet-to-dry ratio
  7. Describe other benefits of determining the “practical” volume solids content of a coating using a wet-to-dry ratio method.

Measuring WFT

  1. Describe the proper use of a wet film thickness gage
  2. Explain the benefits of a 4-in-1 wet film thickness gage versus a traditional wet film thickness gage.

Measuring DFT

  1. Describe the primary difference between the ASTM standard and the SSPC standard for coating thickness measurement.
  2. List two types of dry film thickness gages.
  3. Explain the proper use of a magnetic pull-off dry film thickness gage.
  4. Differentiate between calibration, verification of accuracy, and adjustment.
  5. Identify the frequency of calibration recommended by most manufacturers of dry film thickness gages.
  6. Describe the recommended frequency of accuracy verification of dry film thickness gages.
  7. Explain the difference between a single point and a two-point verification procedure.
  8. Explain how to calculate the combined tolerance of a gage and traceable coated standards when determining the accuracy of a coating thickness gage prior to use.
  9. Explain the procedure for determining the effect of the base metal on coating thickness measurements.
  10. Differentiate between base metal reading and surface profile.
  11. Describe the advantages of using electronic coating thickness gages versus magnetic pull-off coating thickness gages.
  12. Identify the type of standard used to verify gage accuracy.
  13. Identify two types of shims that can be used for gage adjustment procedures.
  14. Describe the procedures for measuring coating thickness along edges.
  15. Explain the difference between a gage reading, spot measurement and area measurement.
  16. Determine the minimum number of gage readings to obtain to generate a spot measurement.
  17. Determine the number of spot measurements that culminate in an area measurement.
  18. Calculate the number of area measurements required based on the total area coated during a work shift.
  19. Calculate he number of area measurements required for a cart or rack of coated pipe.
  20. Describe how Frequency Factors (FF) affect the number of spot measurements to obtain on a cart or rack of coated pipe.
  21. Describe how pipe spool diameter affects the number of circumferential spot measurements.