introduction to blasting and painting in oil and gas

inspection

1. INTRODUCTION TO SURFACE PREPARATION AND PAINTING

2. Why prepare a surface? To remove contaminants and provide a surface to which the paint will readily adhere. This will effectively provide a longer service life from the coating. Two factors for consideration Degree Of Cleanliness. Degree of roughness or surface profile. Surface Preparation

3. Surface not on type material. Types of contaminants. Visible and non-visible contaminants Pre-cleaning before preparation when required Important to know before preparation ex surface condition, welding defect, lamination, edges 3. The degree/grade/standard/stages of the cleaning is mainly depends on time spent on area. Ex: Area of inspection 4. Standard cover for cleanliness ISO SSPC PTS 15.20.03 Degree Of Cleanliness .

4. Shape of profile/pattern on substrate. How to create profile Density of medium Hardness of medium Shape of abrasives media Size of abrasives media 3. Important of roughness ex, bite into substrates. 4. Standard cover for roughness ISO 11126-10 SSPC ex SSPC AB 2 PTS 15.20.03 Degree Of Roughness/Surface Profile.

5. Dry abrasive blast cleaning. Manual Blasting or Wheelabrator Wet blasting. Depending on pressure used. No profile Density of water Hand and power tool cleaning. SSPC and ISO standard Surface Preparation Methods

6. Abrasives. Profile measurement and assessment. Equipment. Dry Abrasive Blasting

7. Copper slag. Expendable. Most commonly used site abrasive. Must only be used once, as it shatters upon impact. It is non-metallic. Dry Abrasive Blasting: Abrasives

8. Garnet. This is a mineral. It can be either expendable, or can be re-cycled, but must be cleaned before re-use. Dry Abrasive Blasting: Abrasives

9. Metallic shot Used in enclosed systems, needs to be cleansed before re-use. Gradually wears down cycle by cycle. Dry Abrasive Blasting: Abrasives

10. Metallic grit and shot mix. Mixing ratio depends on spec. As does the particle sizes. Used in enclosed systems. Grit cuts the profile, shot controls the peaks. Dry Abrasive Blasting: Abrasives

11. Metallic grit. Must be recycled for economic reasons. Not used for site work, and it must be cleansed before re-use. Dry Abrasive Blasting: Abrasives

12. Profile Measurement: Surface Profile Needle Gauge No permanent record

13. Surface Profile Measurement: Dial Micrometer and Surface Replica Tape

14. Shot/Grit blast comparator. Not used for surface cleanliness. Only for assessment of shot blasted substrates. Grit blast comparator can also be used on substrates blasted with grit/shot mix. Surface Profile Assessment Surface Comparator to BS 7079 Pt C, ISO 8503

15. Painting Principle coating Paint matrix for material PTS 15.20.03 Colour Approved Coating Systems List Method application Defect

16. Method Application Spray Brush Roller Important things to careful on application TDS Pot Life Shelf life Mixing

17. Defect 1. As per PTS 15.20.03 Appendix 11: Inspection And Testing Requirements page 59 of 64 PTS.20.03