and Answers 100% Pass
Describe what the characteristics of a heavy flash rusted surface are. 7-5 - ✔✔Rust that
is loosely adherent, easily comes of, & leaves significant marks on a cloth that is lightly
wiped over the surface.
Describe what the characteristics of a moderate flash rusted surface are. 7-5 - ✔✔Rust
that is reasonably well adherent and leaves light marks on a cloth that is lightly wiped
over the surface.
Describe what the characteristics of a light flash rusted surface are. 7-5 - ✔✔Rust that is
tightly adherent & not easily removed by lightly wiping with a cloth.
At what psig is low-pressure cleaning preformed at? 7-2 - ✔✔below 5000 psig
At what psig is high-pressure cleaning preformed at? 7-2 - ✔✔5000-10,000 psig
At what psig is high-pressure waterjetting preformed at? 7-2 - ✔✔10,000-30,000 psig
At what psig is ultrahigh-pressure waterjetting preformed at 7-2 - ✔✔above 30,000 psig
What does waterjetting not create? 7-1 - ✔✔An anchor profile
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, In the marine industry, waterjetting is widely used for what purposes? 7-1 -
✔✔Removal of marine growth, depleted antifouling coatings and surface preparation of
tank/hold interiors
What industries is waterjetting particularly well suited for? 7-1 - ✔✔Marine, process
and utility industries.
What standard specifies the amount of non visible contaminants that are allowed to be
left on the surface? 7-5 - ✔✔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.
What parts does a commercial waterjet unit consist of? 7-6 - ✔✔pumps, hoses, prime
mover, and various tools such as guns, nozzles and lances
What should the minimum burst strength of high-pressure equipment be? 7-7 - ✔✔2
1/2 times the capability of its maximum-rated operating strength.
What is the safety device that high-pressure hoses are fitted with? 7-7 - ✔✔whip-lock or
whip check
What is the section of hose next to the gun fitted with? 7-7 - ✔✔hose shroud
What are the two basic categories that waterjetting equipment fall into? 7-7 - ✔✔Manual
& Robotic
What category does the majority of waterjetting fall into? 7-8 - ✔✔manual
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