NGA 8 INTERNAL CORROSION EXAM QUESTIONS AND ANSWERS

NGA 8 INTERNAL CORROSION EXAM QUESTIONS AND ANSWERS
Whenever Pipe is Removed For Any Reason - CORRECT ANSWER✅✅Internal surface must be inspected
for evidence of corrosion



If Internal Corrosion is Found - CORRECT ANSWER✅✅Adjacent pipe must be investigated to determine
the extent of internal corrosion, replacement must be made and steps must be taken to minimize
internal corrosion



Conducive - CORRECT ANSWER✅✅Areas where water and gas accumulate



Conditions That Indicate Internal Corrosion - CORRECT ANSWER✅✅Deep pitting, material loss, stress
cracking



Probes (Detection of Internal Corrosion) - CORRECT ANSWER✅✅Hydrogen, resistnace, polarization,
corrosion



Should be Saved/Submitted for Future Evaluation - CORRECT ANSWER✅✅Removed pipe sections,
coupons, samples of foreign material



Cleaning Inside of Pipe - CORRECT ANSWER✅✅Avoid disturbing any scale buildup while
________________________.



Visual Inspection - CORRECT ANSWER✅✅Shine a light inside pipe, metal loss, scaling, rust,
indentations, or pits, inspect adjacent pipe, clean inside of pipe avoid disturbing scale build up, submit
samples for further evaluation



Documentation of Internal Corrosion - CORRECT ANSWER✅✅Date of inspection, pipe type, and
location of corrosion found