NGA 11, 12, & 17 - INSTALLING OR REPAIRING COATING IN THE FIELD
2026 EXAM QUESTIONS AND ANSWERS
Pipeline Coating (General Definition) - CORRECT ANSWER✅✅Is a barrier between the pipe and the
electrolytic processes found in the earth.
Procedures During Coating Application - CORRECT ANSWER✅✅Properly cleaned surface, Proper
Priming of surface, Best Available Coating Site, Proper Application of Coating Material, Proper Handling
of Materials, Thorough Inspection
Durometer - CORRECT ANSWER✅✅tool used to measure the hardness of materials
Hygrometer - CORRECT ANSWER✅✅tool used to measure the amount of humidity in air or gas
Pyrometer - CORRECT ANSWER✅✅tool used to measure temperature
Pit Gauge - CORRECT ANSWER✅✅tool used to measure the depth of a pit and can help determine the
amount of wall loss
Wet Film Thickness Gauge - CORRECT ANSWER✅✅tool used to measure the thickness of liquid coating
Dry Film Thickness Gauge - CORRECT ANSWER✅✅tool used to measure the thickness of coating that is
dry
Surface Profile Gauge - CORRECT ANSWER✅✅tool used to measure the profile height of a surface and
is used after grit blasting a surface
Solvent Cleaning (Definition) - CORRECT ANSWER✅✅cleaning method used to remove all visible oil,
grease, soil, drawing, and cutting compounds and other solution contaminants. Does Not remove rust or
mill scale.
, Hand Tool Cleaning (Definition) - CORRECT ANSWER✅✅cleaning method used to prepare the pipe
surface by removing all loose mill scale, loose rust, and other detrimental foreign matter. It is not
intended that adherent rust, mill scale, and paint be removed by this process.
Selecting the proper cleaning method depends on - CORRECT ANSWER✅✅The Piping, Environment,
The Coating Selected, and the Expected Service Life of the Coating System.
White Metal Blast Cleaning (Definition) - CORRECT ANSWER✅✅cleaning method used to clean surfaces
viewed without magnification. Piping must be free of all visible oil, grease, dirt, dust, mill scale, rust
paint, oxides, corrosion products, and other foreign matter before applying.
Commercial Blasting Cleaning (Definition) - CORRECT ANSWER✅✅Cleaning method used on surface
when viewed without magnification. Must be free of all visible oil, grease, dirt, dust, mill scale, rust,
paint, oxides, corrosion products, and other foreign matter, EXCEPT for staining. Staining should be
limited to no more than 33% of each square inch of surface area and may consist of light shadows, slight
streaks, or minor discoloration
Brush-Off Blasting Cleaning (Definition) - CORRECT ANSWER✅✅Cleaning method used on surface
viewed without magnification. Must be free of all visible oil, grease, dirt, dust, loose mill scale, loose
rust, paint, loose mill scale, and loose paint. Tightly adherent to mill scale, rust, and paint may remain on
the surface
Near White Blast Cleaning (Definition) - CORRECT ANSWER✅✅Cleaning method used when viewed
without magnification. Should be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxides,
corrosion products, and other foreign matter, EXCEPT staining. Staining shall be limited to no more than
5% of each square inch of surface area and may consist of light shadows, slight streaks, or minor
discoloration
Power Tool Cleaning to Bare Metal (Definition) - CORRECT ANSWER✅✅Cleaning method used on
metallic surfaces that are prepared according to this specification, when viewed without magnification.
Must be free of all oil, dust, grease, dirt, mill scale, rust, paint, oxide corrosion products, and foreign
matter. Slight residues of rust and paint maybe left in the lower portions of pits if the original surface is
pitted. The profile should not be LESS THAN 1 mil.
High and Ultra-High Pressure Water Jetting for Steel and Other Hard Materials (Definition) - CORRECT
ANSWER✅✅Cleaning method used to provide usage of high and ultra-high water jetting to achieve
2026 EXAM QUESTIONS AND ANSWERS
Pipeline Coating (General Definition) - CORRECT ANSWER✅✅Is a barrier between the pipe and the
electrolytic processes found in the earth.
Procedures During Coating Application - CORRECT ANSWER✅✅Properly cleaned surface, Proper
Priming of surface, Best Available Coating Site, Proper Application of Coating Material, Proper Handling
of Materials, Thorough Inspection
Durometer - CORRECT ANSWER✅✅tool used to measure the hardness of materials
Hygrometer - CORRECT ANSWER✅✅tool used to measure the amount of humidity in air or gas
Pyrometer - CORRECT ANSWER✅✅tool used to measure temperature
Pit Gauge - CORRECT ANSWER✅✅tool used to measure the depth of a pit and can help determine the
amount of wall loss
Wet Film Thickness Gauge - CORRECT ANSWER✅✅tool used to measure the thickness of liquid coating
Dry Film Thickness Gauge - CORRECT ANSWER✅✅tool used to measure the thickness of coating that is
dry
Surface Profile Gauge - CORRECT ANSWER✅✅tool used to measure the profile height of a surface and
is used after grit blasting a surface
Solvent Cleaning (Definition) - CORRECT ANSWER✅✅cleaning method used to remove all visible oil,
grease, soil, drawing, and cutting compounds and other solution contaminants. Does Not remove rust or
mill scale.
, Hand Tool Cleaning (Definition) - CORRECT ANSWER✅✅cleaning method used to prepare the pipe
surface by removing all loose mill scale, loose rust, and other detrimental foreign matter. It is not
intended that adherent rust, mill scale, and paint be removed by this process.
Selecting the proper cleaning method depends on - CORRECT ANSWER✅✅The Piping, Environment,
The Coating Selected, and the Expected Service Life of the Coating System.
White Metal Blast Cleaning (Definition) - CORRECT ANSWER✅✅cleaning method used to clean surfaces
viewed without magnification. Piping must be free of all visible oil, grease, dirt, dust, mill scale, rust
paint, oxides, corrosion products, and other foreign matter before applying.
Commercial Blasting Cleaning (Definition) - CORRECT ANSWER✅✅Cleaning method used on surface
when viewed without magnification. Must be free of all visible oil, grease, dirt, dust, mill scale, rust,
paint, oxides, corrosion products, and other foreign matter, EXCEPT for staining. Staining should be
limited to no more than 33% of each square inch of surface area and may consist of light shadows, slight
streaks, or minor discoloration
Brush-Off Blasting Cleaning (Definition) - CORRECT ANSWER✅✅Cleaning method used on surface
viewed without magnification. Must be free of all visible oil, grease, dirt, dust, loose mill scale, loose
rust, paint, loose mill scale, and loose paint. Tightly adherent to mill scale, rust, and paint may remain on
the surface
Near White Blast Cleaning (Definition) - CORRECT ANSWER✅✅Cleaning method used when viewed
without magnification. Should be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxides,
corrosion products, and other foreign matter, EXCEPT staining. Staining shall be limited to no more than
5% of each square inch of surface area and may consist of light shadows, slight streaks, or minor
discoloration
Power Tool Cleaning to Bare Metal (Definition) - CORRECT ANSWER✅✅Cleaning method used on
metallic surfaces that are prepared according to this specification, when viewed without magnification.
Must be free of all oil, dust, grease, dirt, mill scale, rust, paint, oxide corrosion products, and foreign
matter. Slight residues of rust and paint maybe left in the lower portions of pits if the original surface is
pitted. The profile should not be LESS THAN 1 mil.
High and Ultra-High Pressure Water Jetting for Steel and Other Hard Materials (Definition) - CORRECT
ANSWER✅✅Cleaning method used to provide usage of high and ultra-high water jetting to achieve
