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1. What industries is water jetting particularly well suited for? 7-1 - ANSWER
✓ Marine, process and utility industries.
2. What standard specifies the amount of non visible contaminants that are
allowed to be left on the surface? 7-5 - ANSWER ✓ None. If the coating
specification does not require testing, the inspector should not request the
contractor to do so or do so on his own accord.
3. What parts does a commercial waterjet unit consist of? 7-6 - ANSWER ✓
pumps, hoses, prime mover, and various tools such as guns, nozzles and
lances
4. What should the minimum burst strength of high-pressure equipment be? 7-
7 - ANSWER ✓ 2 1/2 times the capability of its maximum-rated operating
strength.
5. What is the safety device that high-pressure hoses are fitted with? 7-7 -
ANSWER ✓ whip-lock or whip check
6. What is the section of hose next to the gun fitted with? 7-7 - ANSWER ✓
hose shroud
7. What are the two basic categories that waterjetting equipment fall into? 7-7 -
ANSWER ✓ Manual & Robotic
,8. What category does the majority of waterjetting fall into? 7-8 - ANSWER ✓
manual
9. What is the effect when waterjetting at pressures lower that 10,000psig? -
ANSWER ✓ loose rust, debris, and material in depressions and pits are
removed but magnetite remains. A matte finish is not achieved.
10.Describe what robotic waterjetting is. 7-8 - ANSWER ✓ It is a cleaning
vehicle that attaches itself, using vacuum, cables or magnet to a vertical,
horizontal or overhead surfaces.
11.What type of waterjetting collects 95% of water, removed coatings and rust?
7-8 - ANSWER ✓ Robotic waterjetting
12.What is waterjetting effective for removing? 7-10 - ANSWER ✓ Surface oil
& grease
Rust
Concrete splatter
Existing coatings
13.Describe two of the considerations with regards to "back thrust". 7-18 -
ANSWER ✓ fatigue & 1/3 of body weight for an extended period of time.
14.A round jet can produce waterjest at what psig? 7-11 - ANSWER ✓ 35,000
15.Round jets are used for what purpose? 7-12 - ANSWER ✓ cutters
16.Fan jets are used for what purpose? 7-12 - ANSWER ✓ scrapers and\or
pushers
17.What is the typical water flow rate? 7-12 - ANSWER ✓ 1 to 4 gal/min
18.WJ-1 (visual cleanliness) is comparable to which abrasive blast cleaning
standard? - ANSWER ✓ ISO SA 3
19.Robotic water jetting includes - ANSWER ✓ *attaches using vacuum,
cables or magnets
*Vertical, Horizontal or overhead surface
, *Controlled by single operator
*Collects in excess of 95% of the water, removed coatings and rust (waste
generated)
20.A typical water jetting team consists of? - ANSWER ✓ *Nozzle operator
*Pump Operator
*Additional operators or workers as required
21.Considerations with Back Thrust are: - ANSWER ✓ *Causes Fatique
*Should be no more than 1/3 of operators body weight
22.Safety considerations before waterjetting are - ANSWER ✓ *work area is
properly barricaded
*Electrical equipment protected from water
*Electrical connections are not allowed to sit in water
*All fittings and hoses are in good condition / proper pressure rating
*Nozzles are free of obstructions
*System is flushed clean and air removed
*The dump system and all control systems are
operational
Proper LockOut/ TagOut provisions in place
*Confined entry requirements addressed
23.Water jetting advantages include? - ANSWER ✓ *Worker Safety
*Worker air quality
*Less stringent respiratory requirements
*No dust or contamination or clean up
*Environmentally friendly
*Requires less cleanup
24.Water jetting disadvantages include: - ANSWER ✓ *Waterjetting does not
leave a surface profile
*Equipment is very expensive
*Danger of Ultra High Pressure hose breaking
*Danger of injection into the skin or serious cuts
*Collecting and disposing of the contaminated
Water
*Proficient operators needed
, 25.Cause of Blistering on coatings? - ANSWER ✓ Oil, moisture and / or grease
26.Saturation point drops as? - ANSWER ✓ Air is compressed, making air
wetter
27.Check compressor for water contamination at? - ANSWER ✓ Moisture
traps, inter cooler and aftercooler
28.Common Hot Dipped (HD) inspection defects - ANSWER ✓ Cracking,
peeling, bare spots, lumps, Blisters, flux inclusions, ash inclusions and dross
inclusions
29.Describe what a Tooke Gage is and some models - ANSWER ✓
*Destructive test instrument
*Used on non-magnetic or nonferrous
Substrate
*has illuminated 50x microscope
*good from 0-100 mils
*Groove cut through coating
*Models are Mark II and Mark III
30.What are some of the common failures with Siloxanes? - ANSWER ✓
*Delamination- due to application over a non-compatible product
*Cracking-caused by an improper formula, and delamination
31.What type of cure process do Silicone Coatings require? - ANSWER ✓
They require a two-step cure process. (1) solvent-evaporation (2) fully cured
when heated
32.What is the main failure with silicone coatings? - ANSWER ✓
Delamination- which is generally due to an improper heat cure cycle
33.Inspectors should pay close attention to what inspection criteria for Silicone
Coatings? - ANSWER ✓ Pay close attention to the requirements to slowly
and incrementally raise the heat the first time these materials are placed in
service.