Chapter 10 - Surface Preparation

Question 1

Factors during surface preparation that may affect service life include?

Answer 1

Residues of oil, grease and soil.
Residue of non-visible chemical salt 
rust on the surface 
loose or broken mill scale 
rust scale
Anchor pattern 
defects mechanical cleaning equipment 
surface condensation 
old coating that may have poor adhesion or maybe to deteriorated for recoating 
existing coating that maybe incompatible

Question 2

Common design defects include

Answer 2

Hard to reach or inaccessible areas
rivets bolts or other connecters
Welds
Gaps particularly skip Welds or surfaces close together
Overlapping surfaces roof plates in water tanks
angle iron badly orientated or in complex arrangements
threaded area
Dissimilar metals
Shape 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 typical SSPC SP 1 pre cleaning methods include?

Answer 4

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

Question 5

One standard for use with power to cleaning is

Answer 5

ISO St2
ISO St3
SSPC SP -3
SSPC SP-11

Question 6

During surface preparation service cleanliness should be inspected as a minimum for the following three times.

Answer 6

Before any surface preparation activities after surface preparation before coating begin
between each application of coating in a multi coat system

Question 7

Four example of tool used for power tool cleaning are?

Answer 7

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

Question 8

Two abrasive blasting methods include?

Answer 8

Centrifugal blasting
Send injected waterblast 
slurry blast 
wet abrasive blast 
dry grit blast cleaning air blasting

Question 9

Visual standards for abrasive blasting include

Answer 9

SSPC - Vis 1

ISO 8501-1

Question 10

SSPC SP 10 NACE 2 limits staining to ______each unit area

Answer 10

5%

Question 11

SSPC SP 5 NACE 1 limits staining to _____ per each unit area.

Answer 11

0%

Question 12

SSPC SP 6 NACE 3 limits staining to _____ per each unit area.

Answer 12

33%

Question 13

The two types of abrasive blasting nozzles include?

Answer 13

Straight

Venturi

Question 14

The specified level of surface cleanliness must be achieved and maintained?

Answer 14

Immediately prior to coating application

Question 15

Advantages of centrifugal blast equipment include

Answer 15

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 16

Then inspectors checklist for surface preparation should include

Answer 16

Ambient conditions 
conditions of substrate 
pre-blast surface cleanliness shot /grit size selection 
shot /grit cleanliness 
abrasive blasting equipment
 service profile 
surface cleanliness after abrasive blasting 
operator qualification 
safety

Question 17

Abrasive media types include

Answer 17

Shot and grit metallic 
crushed slag 
ceramic grit 
silica sand 
Garnet 
agriculture abrasive 
specialty abrasive

Question 18

Abrasive media typically used for recycling include

Answer 18

Steel shot

steel grit

Question 19

List the pressure ranges that categorize 
low pressure water cleaning 
high-pressure water cleaning 
high-pressure water jetting 
ultra high pressure water jetting

Answer 19

Low pressure water cleaning - <34MPa(5,000 psi)

High-pressure water cleaning - 34 to 70 MPa ( 5,000 - 10,000) psi)

High pressure water jetting - 70 to 210 MPa ( 10,000 - 30,000psi)

Ultra high pressure water jetting > 210 MPa (30,000 psi)

Question 20

Three types of water blasting include?

Answer 20

Grit blasting with a shroud

Sand injected water blast

Question 21

The NACE SSPC waterjetting standard is

Answer 21

NACE 5 / SSPC -SP12.

SSPC/VIS 4 and VIS 7 are visual comparators to be used with the standard.

Question 22

Three test methods for surface profile include?

Answer 22

Comparator and coupons
Replica tape
Digital surface profile gauge

Question 23

What is the standard for indicating water or oil in compressed air and what is it commonly referred to as?

Answer 23

ASTM D 4285

Blotter test