Chapter 10 - Surface Preparation

Question 0

Factors during surface preparation that may effect service life include:

Answer 0

Residues of oil, grease, and soil
Residues of (non-visible) chemical salts
Rust on the surface
Loose or broken mill scale
Rust scale
Anchor pattern
Defects mechanical cleaning equipment
Surface condensation
Old coatings that may have poor adhesion or may be too deteriorated for recoating
 Existing coatings that may be incompatible.

Question 1

During surface preparation, surface cleanliness should be inspected (as a minimum) the following three(3) times:

Answer 1

Before any surface preparation activities
After surface preparation, before coating begins
Between each application of coating in a multi-coat system

Question 2

Common design defects include:

Answer 2

Hard to reach or inaccessible areas
Rivets, bolts, or other connectors
Welds
Gaps(particularly skip welds or surfaces close together)
Overlapping surfaces
Angle iron badly oriented or in complex arrangements
Threaded areas
Dissimilar metals
Sharp edges, particularly on corners or rough cut plate
Construction aids

Question 3

Common fabrication defects include:

Answer 3

Weld spatter
Skip welds
Rough welds
Sharp corners and edges

Question 4

Four (4) typical SSPC SP1 pre-cleaning methods include:

Answer 4

Solvent wipe with cloth or rag
Immersion of the substrate in solvent
Solvent spray
Vapor degreasing
Steam cleaning 
Chemical paint stripping 
Use of alkaline cleaners

Question 5

One standard for use with Power Tool Cleaning is :

Answer 5

ISO ST2
ISO ST3
SSPC SP-3
SSPC SP-11

Question 6

Four (4) examples of tools used for Power Tool Cleaning are:

Answer 6

Rotary wire brushes
Impact tools
Needle scaler
Rotary scalers
Piston scalers
Grinders and sanders 
Disk sanders

Question 7

Two (2) Abrasive Blasting methods include:

Answer 7

Centrifugal blasting
Sand-injected water blast
Slurry blast
Wet abrasive blast
Dry grit blast cleaning(air blasting)

Question 8

Visual standards for abrasive blasting include:

Answer 8

SSPC VIS 1

ISO 8501-1

Question 9

SSPC SP 10/ NACE 2 limits staining ____ per each unit area

Answer 9

5%

Question 10

SSPC SP 5/ NACE 1 limits staining to ___% per each unit area

Answer 10

0%

Question 11

SSPC SP6 / NACE 3 limits staining to ___% per each unit area

Answer 11

33%

Question 12

The two (2) types of abrasive blasting nozzles include:

Answer 12

Straight

Venturi

Question 13

The specified level of surface cleanliness must be achieved and maintained_____________

Answer 13

Immediately prior to coatings application.

Question 14

Advantages of centrifugal blast equipment include:

Answer 14

Dust and fines are contained
Abrasives are easily recycled
Blasting and priming can be an inline operation
General overall economy compared to air blasting
No compressors, piping, or air handling equipment needed for wheel blasting

Question 15

The inspector’s checklist for surface preparation should include:

Answer 15

Ambient conditions
Conditions of substrate
Pre-Blast surface cleanliness 
Shot/Grit size selection
Shot/Grit cleanliness
Abrasive Blasting Equipment
Surface Profile
Surface cleanliness after abrasive blasting
Operator qualifications 
Safety

Question 16

Abrasive media types include:

Answer 16

Shot & Grit (metallic)
Crushed slag
Ceramic grit
Silica sand
Garnet
Agricultural Abrasives
Specialty Abrasives

Question 17

Abrasive media typically used for recycling include:

Answer 17

Steel Shot

Steel Grit

Question 18

List the pressure ranges that categorize:
Low pressure water cleaning
High pressure water cleaning
High pressure water jetting
Ultrahigh pressure water jetting

Answer 18

Low pressure water cleaning 210MPa (30,000 psi)

Question 19

Three (3) types of water-blasting include:

Answer 19

Grit Blasting with a Shroud
Sand Injected Water Blast
Slurry Blast with Grit/Water Mix

Question 20

The NACE / SSPC Waterjetting Standard is:

Answer 20

NACE 5/SSPC-SP12

Question 21

Three (3) test methods for surface profile include:

Answer 21

Comparator and coupons
Replica Tape
Digital Surface Profile Guage