NACE CIP Level 2 Questions and Answers|
Latest Update
What type of waterjetting collects 95% of water, removed coatings and rust? 7-8 Robotic
waterjetting
What is waterjetting effective for removing? 7-10 Surface oil & grease
Rust
Concrete splatter
Existing coatings
Describe two of the considerations with regards to "back thrust". 7-18 fatigue & 1/3 of
body weight for an extended period of time.
A round jet can produce waterjest at what psig? 7-11 35,000
Round jets are used for what purpose? 7-12 cutters
Fan jets are used for what purpose? 7-12 scrapers and\or pushers
What is the typical water flow rate? 7-12 1 to 4 gal/min
, What is the effect when waterjetting at 10,000 psig? a uniform matte finish is obtained
and the black oxide is removed but at a rate too slow to be considered practical.
What is the effect when waterjetting at 34,000 to 36,000 psig? a uniform matte finish is
obtained. Surface materials, including most mill scale are removed.
What is the effect when waterjetting at 20,000 psig? a uniform matte finish is obtained.
Black oxide, paint, elastomeric coatings, enamel, red oxide, and polypropylene sheet finish are
removed. Chemical contaminants will be removed, but with varying degrees of effectiveness.
At what distance should the tip be held from the surface when removing mill scale and rust
scale? 2 inches
Before beginning work, what should the waterjet team ensure be done? Area properly
barricaded
Electrical equipment properly covered
Electrical connections are not in water
All fittings and hoses are in good condition
Nozzles are open and free of obstructions
System is flushed clean and air removed
All moving equipment are mechanically disabled
List some advantages of waterjetting over dry abrasive blasting. Less dangerous for crew
Better air quality
Latest Update
What type of waterjetting collects 95% of water, removed coatings and rust? 7-8 Robotic
waterjetting
What is waterjetting effective for removing? 7-10 Surface oil & grease
Rust
Concrete splatter
Existing coatings
Describe two of the considerations with regards to "back thrust". 7-18 fatigue & 1/3 of
body weight for an extended period of time.
A round jet can produce waterjest at what psig? 7-11 35,000
Round jets are used for what purpose? 7-12 cutters
Fan jets are used for what purpose? 7-12 scrapers and\or pushers
What is the typical water flow rate? 7-12 1 to 4 gal/min
, What is the effect when waterjetting at 10,000 psig? a uniform matte finish is obtained
and the black oxide is removed but at a rate too slow to be considered practical.
What is the effect when waterjetting at 34,000 to 36,000 psig? a uniform matte finish is
obtained. Surface materials, including most mill scale are removed.
What is the effect when waterjetting at 20,000 psig? a uniform matte finish is obtained.
Black oxide, paint, elastomeric coatings, enamel, red oxide, and polypropylene sheet finish are
removed. Chemical contaminants will be removed, but with varying degrees of effectiveness.
At what distance should the tip be held from the surface when removing mill scale and rust
scale? 2 inches
Before beginning work, what should the waterjet team ensure be done? Area properly
barricaded
Electrical equipment properly covered
Electrical connections are not in water
All fittings and hoses are in good condition
Nozzles are open and free of obstructions
System is flushed clean and air removed
All moving equipment are mechanically disabled
List some advantages of waterjetting over dry abrasive blasting. Less dangerous for crew
Better air quality
