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NACE > Chapter Q's > Flashcards

Chapter Q's Flashcards

0
Q

What is the inspector’s responsibility when it comes to safety on a project?

A

The inspector is not responsible for safety enforcement but should report on any issues that may effect the project.

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1
Q

How does NACE define the inspector’s role?

A

The book: quality control technician responsible for observing and reporting conformance or deviation for the projects specifications

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2
Q

Name some tests that may need to be conducted during surface preparation and coating operations.

A

Temperature, relative humidity, due point, surface cleanliness, Anchor profile

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3
Q

Name some of the documentation/reports that may be required to be maintained on a coatings project.

A

Daily reports, weekly reports, material usage reports, manpower and equipment, non conformance and conformance

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4
Q

What are the most important characteristics of a good report?

A

Accuracy, detailed, objective

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5
Q

What is the inspector’s primary responsibility and what should the inspector not do as it pertains to the specification

A

Enforce the specifications, but can never change the specification for any reason

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6
Q

What type of information could you expect to find on a product data sheet?

A

Surface preparation and application information such as…
Recommended level of surface cleanliness
Recommended application methods
Recommended equipment (such as tip size)
Environmental parameters for application
Max and min temps
Curing times
Recoat windows

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7
Q

What type of information could you expect to find on a material safety data sheet?

A

Health, safety and environmental, PPE required - physical characteristics - emergency responder information.

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8
Q

Explain the difference between quality assurance (QA) and quality control (QC).

A

QA: Any systematic process of checking to see weather a product or service being developed is meeting specified requirements.

QC: a procedure or set of procedures intended to ensure that a manufactured procurement or preformed service adheres to the defined set of quality criteria or meets the requirements of the client or customer.

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9
Q

Define corrosion:

A

The deterioration of a substance, usually a metal from a reaction with its environment.

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10
Q

What is passivation?

A

A layer or oxides formed on the surface of a metal that provides corrosion protection, stainless steal for example

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11
Q

What are the elements of a corrosion cell?

A

Anode, cathode, metallic pathway, electrolyte

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12
Q

Describe what happens at the anode.

A

The metal dissolves into the electrolyte

The anode is the part that dissolves

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13
Q

What is the function of the electrolyte?

A

Allows that passage of ions to connect the corrosion cell.

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14
Q

What is the function of the metallic pathway?

A

Transfer electrons. Allows the flow of electron to connect the corrosion cell.

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15
Q

The general rules of galvanic corrosion are:

A

The less noble (more reactive) metal when connected to a more noble (less reactive metal) will corrode preferentially

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16
Q

Name at least five factors that affect the rate of corrosion.

A

Humidity - (wetness) the wetter the more corrosion

Oxygen - more oxygen - faster corrosion

Chemical salts - increases corrosion due to increasing the efficiency of the electrolyte

Pollutants - (acid gases)

Temperature - higher temp- faster corrosion

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17
Q

General corrosion is:

A

Results in a Relatively uniform loss of material over the entire surface.
Results in a general thinning of the affected surface
Relatively easy to inspect
Does not cause catastrophic failures

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18
Q

Localized corrosion is:

A

Typically pitting and crevice corrosion

It is typically the most concerning as damage is concentrated and loss of integrity or structural failure can result

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19
Q

List some of the common tools/methods used for corrosion control

A
  • design - build to avoid corrosion
  • inhibitors - additives that slow corrosion
  • metal selection - choose better material
  • cathodic protection - using another metal attached with a pathway that will corrode instead (becomes the anode)
  • protective coatings
  • splash zone systems
  • alteration of the environment
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20
Q

What is the galvanic series?

A

A list of metals in order or reactivity (more or less noble) in seawater at 25° C

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21
Q

Identify some of the defects that can be caused by incorrect application temperatures.

A

Failure to cure
To rapid solvent evaporation
Poor film formation

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22
Q

Describe relative humidity.

A

• Measure of the amount of moisture in the air compared to
saturation level.

  • May affect the coating if too high or too low.
  • Too high may cause solvent entrapment.
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23
Q

What is the dew point temperature?

A

Me: The temperature in which moisture will begins to form the the surface of steel

Wit rate should be 5° above. The due point for applications

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24
Q

Name some of the effects wind may have on a coating project.

A
  • Blowing abrasives
  • Causing excessive overspray
  • Accelerating solvent evaporation
  • Contributing to the formation of dry spr
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25
Q

What are some of the common errors when using an electronic hygrometer?

A

Failure to acclimate instrument to the environment with accurate time

26
Q

Explain the process for use of the sling psychrometer.

A

• Make sure the wick is wet and clean.

• Continue to “sling” until consecutive readings are
achieved
(3 consecutive readings is a good practice).

27
Q

List three (3) desirable properties of a coating.

A 
Chemical resistant
water resistant
Ease of application
Adhesion to substrate
Cohesive strength 
Flexibility and elongation
Impact Resistance 
abrasive resistance
Temperature resistance 
Dielectric strength
28
Q

Two (2) broad classifications of a coating are:

A

Organic - convertible - thermosetting

inorganic – non-convertible - thermoplastic

29
Q

What are two (2) primary components of a liquid applied coating?

A

Pigment

Vehicle – (resin, binder and solvent)

30
Q

Describe the three (3) methods by which a coating provides corrosion control

A

inhibited, sacrificial, barrier

31
Q

What are the three (3) different ways a coating can adhere to the surface?

A

Chemical, mechanical, polar or a combination of all three

32
Q

Effects of Corrosion (why act against corrosion)

A

Safety
Cost
Appearance

33
Q

The two broad classification for curing mechanisms are:

A

Convertible

Non-Convertible

34
Q

List two (2) Non-convertible coating types.

A

Chlorinated Rubber

Vinyl

35
Q

List three (3) convertible coating curing mechanisms.

A

Oxidation
Co-reaction (polymerization)
Hydration
Fusion

36
Q

List two (2) characteristics of oxidation cure coatings.

A

Not suitable for immersion service
Not suitable for use over alkaline substrates
Limited dry film thickness per coat

37
Q

List three (3) coating types that cure by polymerization.

A 
Epoxies 
  Polyurethanes 
  Polyureas 
  Polyaspartics 
  Polysiloxanies
38
Q

Induction time is

A

the time required by the product data sheet (coatings manufacturer) between mixing the coating and the start of application.

39
Q

What is a main requirement for a hydration coating to cure?

A

Moisture

40
Q

Industrial and marine coatings are commonly referred to by

A

generic resin type.

41
Q

Oil based coatings applied over alkaline surfaces may result in

A

Saponification

42
Q

List five (5) of the formal sections usually contained in a good specification.

A 
Scope of work 
  Terms and definitions 
  Reference standards and codes 
  Safety 
  Pre-job conference 
  Surface preparation 
  Coating materials (includes the coating schedule) 
  Sampling coatings 
  Workmanship 
  Application 
  Work schedule (sequence of work to be done) 
  Repairs and remedial coating work 
  Inspection 
  Documentation
43
Q

What are two of the inspector’s responsibilities as it relates to the
specification?

A

Enforce the specification.

NOT to make changes to the specification.

44
Q

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

A

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

45
Q

Factors during surface preparation that may effect service life include:

A

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

46
Q

Common design defects include:

A

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

47
Q

Common fabrication defects include:

A

Weld Spatter
Skip Welds
Rough Welds
Sharp Corners & Edges

48
Q

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

A 
Solvent wipe with cloth or rag 
  Immersion of the substrate in solvent 
  Solvent spray 
  Vapor degreasing 
  Steam cleaning 
  Emulsion cleaning 
  Chemical paint stripping 
  Use of alkaline cleaners
49
Q

One Standard for use with Power Tool Cleaning is:

A

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

50
Q

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

A 
Rotary Wire Brushes  
  Impact tools  
  Needle Scaler  
  Rotary Scalers  
  Piston Scalers  
  Grinders and sanders  
  Disc Sanders
51
Q

Two (2) Abrasive Blasting methods include:

A 
Centrifugal blasting 
  Sand-injected water blast 
  Slurry blast 
  Wet abrasive blast 
  Dry Grit Blast Cleaning (Air Blasting)
52
Q

Visual Standards for abrasive blasting include:

A

SSPC-Vis 1

ISO 8501-1

53
Q

SSPC SP 5/NACE 1 limits staining to

SSPC SP 10/NACE 2 limits staining to

SSPC SP 6/NACE 3 limits staining to

A

0% per each unit area
5% per each unit area
33% per each unit area

54
Q

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

A

Straight

Venturi

55
Q

The specified level of surface cleanliness must be achieved and maintained

A

immediately prior to coatings application.

56
Q

Advantages of centrifugal blast equipment include:

A

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

57
Q

The Inspector’s checklist for surface preparation should include:

A 
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
58
Q

Abrasive media types include:

A 
Shot & Grit (metallic) 
  Crushed Slag  
  Ceramic Grit 
  Silica Sand  
  Garnet 
  Agricultural Abrasives  
  Specialty Abrasives
59
Q

List the pressure ranges that categorize:

A

Low Pressure Water Cleaning: 210 MPa (30,000 psi)

60
Q

Three (3) types of Water-Blasting include:

A

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

61
Q

The NACE/SSPC Waterjetting Standard is:

A

NACE 5/SSPC-SP12. SSPC/VIS 4 and VIS 7 are visual comparators to be used with the standard.

62
Q

Three (3) Test Methods for surface profile include:

A

Comparator and coupons
Replica tape
Digital Surface Profile Gauge

NACE (6 decks)

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