CIP 1 Surface Prep Flashcards
Factors during surface preparation that may affect service life
Residues of oil grease and soil; of non-visible chemical salt; rust on the surface; loose or broken mill scale; rust scale; anchor pattern; defects mechanical clean equipment; surface condensation; old coatings poor adhesion; existing coating that may be Incompatible
During surface preparation, surface cleanliness should be inspected at a minimum the following three times
Before surface prep, after surface prep before application and between each application of coating in a multi-coat system
Common design defects include
Hard to reach inaccessible areas; rivets bolts or other connectors; welds; gaps; overlapping’s surfaces; angle iron badly orientated; threaded areas; dissimilar metals; sharp edges; construction aids
Common fabrication defects including
Weld splatter, skip welds; Rough welds; sharp corners and edges
For typical SSPC SP1 pre-cleaning methods
Solvent wipe with cloth; Emursion of the substrate in solvent; solvent spray; vapor degreasing; steam cleaning; emulsion cleaning; chemical paint stripping; use of alkaline cleaners
standards for used with PowerTool cleaning
ISO St 2; ISO St3; SSPC SP-3; SSPC SP-11
For examples of tools used for PowerTool cleaning
Rotary wire brushes; impact tool; needle scaler; rotary scaler; piston scaler; grinders and Sanders; disc Sanders
Two abrasive blasting methods
Centrifugal blasting; Sand injected waterblast; slurry blast; wet abrasive blasting; Dry abrasive blast cleaning
Visual standards for abrasive blasting include
SSPC-Vis 1 and ISO 8501-1
NACE 1, NACE 2, NACE 3 allows staining to what percentages
0%, 5%, 33%
Two types of abrasive blasting nozzles
Straight, Venturi
The specified level of surface cleanliness must be achieved and maintained
Immediately prior to coatings application
Visual comparator standard
SPO178
Visual standard ISO
ISO8501-1
Dust -standard acceptance
ISO 8502-3
