Describe what the characteristics of a heavy flash rusted surface are. 7-5
Right Ans - 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
Right Ans - 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
Right Ans - 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 Right Ans - below
5000 psig
At what psig is high-pressure cleaning preformed at? 7-2 Right Ans - 5000-
10,000 psig
At what psig is high-pressure waterjetting preformed at? 7-2 Right Ans -
10,000-30,000 psig
At what psig is ultrahigh-pressure waterjetting preformed at 7-2 Right Ans
- above 30,000 psig
What does waterjetting not create? 7-1 Right Ans - An anchor profile
In the marine industry, waterjetting is widely used for what purposes? 7-1
Right Ans - Removal of marine growth, depleted antifouling coatings and
surface preparation of tank/hold interiors
What industries is waterjetting particularly well suited for? 7-1 Right Ans -
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 Right Ans - 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.
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