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AMPP CIP Level 2 > Waterjetting > Flashcards

Waterjetting Flashcards

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1
Q

What is waterjetting?

A

The use of high-energy water stream to strip off existing coatings and remove contaminants on a substrate being prepared prior to coatings application

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2
Q

Waterjetting denotes the use of “water only”, without the addition of solid particles such as sand or garnet in the water system.
True or false?

A

True

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3
Q

Waterjetting is pressure up to 620 MPa (90,000 psig).
True or false?

A

True

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4
Q

Waterjetting Standard also addresses water cleaning which is basically the same process at lower pressures.
True or false?

A

True

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5
Q

There is a direct correlation between results from dry abrasive blasting and waterjetting.
True or false?

A

False. There is NO direct correlation between results from dry abrasive blasting and waterjetting.

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6
Q

Waterjetting will remove a surface profile.
True or false?

A

False. Waterjetting will not remove profile.

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7
Q

What is NACE WJ-1/SSPC-SP WJ-1?

A

Waterjetting Cleaning of Metals-Clean to Bare Substrate (WJ-1)

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8
Q

What is NACE WJ-2/SSPC-SP WJ-2?

A

Waterjetting Cleaning of Metals-Very Thorough Cleaning (WJ-2)

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9
Q

What is NACE WJ-3/SSPC-SP WJ-3?

A

Waterjetting Cleaning of Metals-Thorough Cleaning (WJ-3)

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10
Q

What is NACE WJ-4/SSPC-SP WJ-4?

A

Waterjetting Cleaning of Metals-Light Cleaning (WJ-4)

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11
Q

What is the visual guide that has been developed for steel surfaces prepared by High- and Ultrahigh-Pressure Waterjetting?

A

NACE VIS 7/SSPC-VIS 4

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12
Q

Waterjetting

Specifier and contractor must agree on test method for determining non-visible contaminates.
True or false?

A

True

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13
Q

Coating manufacturer should be consulted regarding coating tolerance to surface condition after WJ.
True or false?

A

True

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14
Q

Definition of Low-Pressure Water Cleaning (LP WC)

A

Cleaning performed at pressures below 34 MPa (5,000 psig)

This is also called “power washing” or “pressure washing”

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15
Q

Definition of High-Pressure Water Cleaning (HP WC)

A

Cleaning performed at pressures of 34 MPa to 70 MPa (5,000 to 10,000 psig)

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16
Q

Definition of High-Pressure Waterjetting (HP WJ)

A

Waterjetting performed at pressures of 70 MPa to 210 MPa (10,000 to 30,000 psig)

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17
Q

Definition of Ultrahigh-Pressure Waterjetting (HP WJ)

A

Waterjetting performed at pressures above 210 MPa (30,000 psig)

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18
Q

Degree of Cleanliness for WJ-1

A

Cleaning to Bare Substrate

When viewed without magnification, shall have a matte finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products, previous coatings, mill scale, and foreign matter

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19
Q

Degree of Cleanliness for WJ-2

A

Very Thorough Cleaning

When viewed without magnification, shall have a matte finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products except for randomly dispersed stains of rust and other corrosion products, tightly adherent thin coatings, and other tightly adherent foreign matter. The staining or tightly adherent matter shall be limited to no more than 5% of each unit area of surface.

20
Q

Degree of Cleanliness for WJ-3

A

Thorough Cleaning

When viewed without magnification, shall have a matte finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products except for randomly dispersed stains of rust and other corrosion products, tightly adherent thin coatings, and other tightly adherent foreign matter. The staining or tightly adherent matter shall be limited to no more than 33% of each unit area of surface.

21
Q

Degree of Cleanliness for WJ-4

A

Light Cleaning

When viewed without magnification, shall have a matte finish and shall be free of all visible oil, grease, dirt, dust, loose mill scale, loose rust and other corrosion products, and loose coating

22
Q

What is considered “tightly adherent” coatings, mill scale, and foreign matter?

A

When they cannot be removed with a dull putty knife

23
Q

What is a unit area of surface?

A

An area ~9 inches² (3 inches by 3 inches)

24
Q

What is flash rust?

A

A technical consideration when a cardon steel substrate is subjected to waterjet cleaning

25
Q

What are the degrees of flash rust?

A
  • No flash rust
  • Light (L)
  • Moderate (M)
  • Heavy (H)
26
Q

None of the standards WJ-1 - WJ-4 specifies the amount of non-visible contaminates (soluble salts) that are allowed to be left on the surface.
True or false?

A

True. This is left up to the specifier.

27
Q

The waterjetting team consists of:

A
  • The nozzle operator
  • The pump operator
  • Additional operators or workers
28
Q

Waterjetting is effectice for removing:

A
  • Surface oil and grease
  • Grease
  • Concrete spatter (shot-crete)
  • Existing coatings
  • Water-soluble contaminants
  • An underwater unit to clean barnacles or other mirco-organisms for ship hull or off-shore platform legs
29
Q

Round jets are the most common for waterjetting.
True or false?

A

True

30
Q

Round jets are used as what for waterjetting?

A

Cutters

31
Q

Fan jets are used as what for waterjetting?

A

Scrappers and/or pushers

32
Q

What are the advantages of waterjetting vs. dry abrasive blasting?

A
  • Worker safety
  • Worker air quality
  • Respiratory requirements may be less stringent
  • No dust contamination or cleanup
  • Friendly to the environment
  • Relatively cost effective
  • Requires less cleanup
33
Q

What are the disadvantages of waterjetting vs. dry abrasive blasting?

A
  • Waterjetting leaves no profile
  • Equipment is very expensive
  • Danger of UHP lose breaking
  • Danger of injection into the skin or serious cuts
  • Collecting and disposing of the contaminated water
  • Proficient operators
34
Q

When compared to abrasive blast cleaning, which of the following are advantages of waterjetting?
A. Typically less stringent respiratory protection required
B. No abrasive waste disposal requirements
C. Less power used to run equipment
D. Lower equipment costs

A

A. Typically less stringent respiratory protection required
B. No abrasive waste disposal requirements

35
Q

The waterjetting standard allowing for the least amount of visible contaminates is:
A. NACE WJ-1/SSPC-SP WJ-1
B. NACE WJ-2/SSPC-SP WJ-2
C. NACE WJ-3/SSPC-SP WJ-3
D. NACE WJ-4/SSPC-SP WJ-4

A

A. NACE WJ-1/SSPC-SP WJ-1

Waterjetting Cleaning of Metals-Clean to Bare Substrate (WJ-1)

36
Q

Which of the following are Flash Rust designations of waterjetting?
A. No flash rust
B. Light
C. Moderate
D. Heavy

A

A. No flash rust
B. Light
C. Moderate
D. Heavy

37
Q

When viewing NACE WJ-2/SSPC-SP WJ-2 the allowable tightly adherent thin coating that can remain on the surface after preparation is:
A. No coatings, can remain
B. 5%
C. 10%
D. 33%

A

B. 5%

When viewed without magnification, shall have a matte finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products except for randomly dispersed stains of rust and other corrosion products, tightly adherent thin coatings, and other tightly adherent foreign matter. The staining or tightly adherent matter shall be limited to no more than 5% of each unit area of surface.

38
Q

When using UHP waterjetting with an inhibitor, the steel surface after cleaning will appear __________.
A. As a dull matte finish
B. As a bright glossy finish
C. As a golden (ginger) hue
D. As a red-oxide color

A

A. As a dull matte finish

39
Q

Waterjetting can be an effective method for ___________?
A. Removing rust
B. Cleaning pits
C. Profiling steel
D. Removing barnacles

A

A. Removing rust
B. Cleaning pits
D. Removing barnacles

40
Q

As the coating inspector on a high pressure waterjetting project, what safety rear would you expect to see?
A. Metatarsal guard
B. Whip lock
C. Hose shroud
D. Low pressure hose

A

A. Metatarsal guard
B. Whip lock
C. Hose shroud

41
Q

What cleaning method uses water at pressures from 34 to 70 MPa (5,000 to 10,000 psi)?
A. Low pressures water cleaning
B. High pressure water jetting
C. High pressure water cleaning
D. Ultrahigh pressure water jetting

A

C. High pressure water cleaning

42
Q

You are a new inspector on a UHP waterjetting project. What is the typical distance between the waterjetting tip and the surface that you would expect to see?
A. 0 inches
B. 2 inches
C. 1 foot
D. 2 feet

A

B. 2 inches

43
Q

For waterjetting, what is the typical distance to hold the nozzle from the surface?

A

2 to 10 inches

44
Q

For UHP WJ, what is the typcial distance to hold the nozzle from the surface?

A

0.25 to 0.5 inches

45
Q

For waterjetting, what angle do you hold the nozzle from the surface when removing heavy ruse scale or old coatings?

A

90 degrees, virtually perpendicular from the surface

46
Q

For waterjetting, what angle do you hold the nozzle from the surface for when removing mastics?

A

45 degrees

AMPP CIP Level 2 (18 decks)

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