PHMSA CORROSION CONTROL OF PIPELINE
SYSTEMS EXAMINATION COMPLETE QUESTIONS
AND DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR JUST RELEASED
Exam Coverage Summary
1. Federal Pipeline Safety Regulations (49 CFR Parts 192 & 195)
o Understanding PHMSA regulations governing corrosion control for gas and hazardous liquid
pipelines.
2. Corrosion Fundamentals
o Electrochemical principles, corrosion cells, corrosion types, and contributing environmental
factors.
3. Internal Corrosion Control
o Causes, monitoring methods, inhibitors, pigging operations, and moisture control.
4. External Corrosion Control
o Soil corrosion, atmospheric corrosion, coatings, wraps, and environmental influences.
5. Cathodic Protection (CP) Systems
o Sacrificial anode systems, impressed current systems, CP criteria, and troubleshooting.
6. Pipeline Coatings and Linings
o Coating materials, inspection, defects, repairs, holidays, and coating compatibility.
7. Corrosion Monitoring and Testing
o Pipe-to-soil potential surveys, close interval surveys (CIS), DCVG, ACVG, coupons, probes, and
rectifier inspections.
8. Inspection, Maintenance, and Recordkeeping
o Inspection intervals, documentation requirements, qualification records, and compliance
reporting.
9. Integrity Management
o Risk assessment, corrosion threat evaluation, direct assessment, remediation, and preventive
maintenance.
10. Safety, Standards, and Best Practices
NACE/AMPP standards, OSHA safety practices, electrical hazards, excavation safety, and environmental
protection.
PHMSA Corrosion Control of Pipeline Systems Examination
Question 1
,Which statement best explains why corrosion control is considered an essential component of
pipeline integrity management under PHMSA regulations for both gas and hazardous liquid
pipeline systems?
A. Corrosion only affects pipeline appearance and has little impact on operational safety.
B. Corrosion can reduce pipe wall thickness, leading to leaks, failures, environmental damage,
and public safety hazards.
C. Corrosion only occurs on aboveground piping exposed to weather.
D. Corrosion is only monitored after a pipeline failure has occurred.
Answer: B
Rationale: Corrosion gradually weakens pipelines by reducing wall thickness, increasing the risk
of leaks, ruptures, and environmental incidents.
Question 2
Which electrochemical condition must exist before corrosion of a buried steel pipeline can
occur in the presence of an electrolyte such as moist soil?
A. The pipe must be completely insulated.
B. An anode, cathode, electrolyte, and metallic path must all exist.
C. The pipeline must be carrying natural gas.
D. Oxygen must be completely absent.
Answer: B
Rationale: Corrosion cells require four components: an anode, cathode, electrolyte, and
metallic path.
Question 3
Which federal regulation primarily establishes corrosion control requirements for natural gas
transmission and distribution pipelines operated within the United States?
,A. 49 CFR Part 192
B. OSHA 1910
C. NFPA 70
D. EPA Clean Air Act
Answer: A
Rationale: Part 192 governs gas pipelines and includes corrosion control requirements.
Question 4
Which federal regulation contains corrosion control requirements applicable to hazardous
liquid pipeline systems?
A. 49 CFR Part 195
B. 49 CFR Part 191
C. OSHA 1926
D. API 653
Answer: A
Rationale: Hazardous liquid pipelines are regulated under 49 CFR Part 195.
Question 5
A corrosion engineer observes localized deep penetration into the pipe wall while the
surrounding metal remains largely unaffected. Which type of corrosion is most likely occurring?
A. Uniform corrosion
B. Galvanic corrosion
C. Pitting corrosion
D. Atmospheric oxidation
, Answer: C
Rationale: Pitting corrosion causes highly localized metal loss and can quickly penetrate pipe
walls.
Question 6
Which environmental condition generally increases the corrosion rate of buried steel pipelines?
A. Dry, nonconductive soil
B. Moist soil with dissolved salts
C. Vacuum conditions
D. Thick concrete encasement
Answer: B
Rationale: Moist, conductive soils containing salts accelerate electrochemical corrosion.
Question 7
What is the primary purpose of applying protective coatings to buried steel pipelines?
A. Increase gas flow velocity.
B. Electrically isolate the steel from the surrounding environment.
C. Reduce operating pressure.
D. Improve pipeline flexibility.
Answer: B
Rationale: Coatings prevent soil from contacting steel, reducing corrosion exposure.
Question 8
SYSTEMS EXAMINATION COMPLETE QUESTIONS
AND DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR JUST RELEASED
Exam Coverage Summary
1. Federal Pipeline Safety Regulations (49 CFR Parts 192 & 195)
o Understanding PHMSA regulations governing corrosion control for gas and hazardous liquid
pipelines.
2. Corrosion Fundamentals
o Electrochemical principles, corrosion cells, corrosion types, and contributing environmental
factors.
3. Internal Corrosion Control
o Causes, monitoring methods, inhibitors, pigging operations, and moisture control.
4. External Corrosion Control
o Soil corrosion, atmospheric corrosion, coatings, wraps, and environmental influences.
5. Cathodic Protection (CP) Systems
o Sacrificial anode systems, impressed current systems, CP criteria, and troubleshooting.
6. Pipeline Coatings and Linings
o Coating materials, inspection, defects, repairs, holidays, and coating compatibility.
7. Corrosion Monitoring and Testing
o Pipe-to-soil potential surveys, close interval surveys (CIS), DCVG, ACVG, coupons, probes, and
rectifier inspections.
8. Inspection, Maintenance, and Recordkeeping
o Inspection intervals, documentation requirements, qualification records, and compliance
reporting.
9. Integrity Management
o Risk assessment, corrosion threat evaluation, direct assessment, remediation, and preventive
maintenance.
10. Safety, Standards, and Best Practices
NACE/AMPP standards, OSHA safety practices, electrical hazards, excavation safety, and environmental
protection.
PHMSA Corrosion Control of Pipeline Systems Examination
Question 1
,Which statement best explains why corrosion control is considered an essential component of
pipeline integrity management under PHMSA regulations for both gas and hazardous liquid
pipeline systems?
A. Corrosion only affects pipeline appearance and has little impact on operational safety.
B. Corrosion can reduce pipe wall thickness, leading to leaks, failures, environmental damage,
and public safety hazards.
C. Corrosion only occurs on aboveground piping exposed to weather.
D. Corrosion is only monitored after a pipeline failure has occurred.
Answer: B
Rationale: Corrosion gradually weakens pipelines by reducing wall thickness, increasing the risk
of leaks, ruptures, and environmental incidents.
Question 2
Which electrochemical condition must exist before corrosion of a buried steel pipeline can
occur in the presence of an electrolyte such as moist soil?
A. The pipe must be completely insulated.
B. An anode, cathode, electrolyte, and metallic path must all exist.
C. The pipeline must be carrying natural gas.
D. Oxygen must be completely absent.
Answer: B
Rationale: Corrosion cells require four components: an anode, cathode, electrolyte, and
metallic path.
Question 3
Which federal regulation primarily establishes corrosion control requirements for natural gas
transmission and distribution pipelines operated within the United States?
,A. 49 CFR Part 192
B. OSHA 1910
C. NFPA 70
D. EPA Clean Air Act
Answer: A
Rationale: Part 192 governs gas pipelines and includes corrosion control requirements.
Question 4
Which federal regulation contains corrosion control requirements applicable to hazardous
liquid pipeline systems?
A. 49 CFR Part 195
B. 49 CFR Part 191
C. OSHA 1926
D. API 653
Answer: A
Rationale: Hazardous liquid pipelines are regulated under 49 CFR Part 195.
Question 5
A corrosion engineer observes localized deep penetration into the pipe wall while the
surrounding metal remains largely unaffected. Which type of corrosion is most likely occurring?
A. Uniform corrosion
B. Galvanic corrosion
C. Pitting corrosion
D. Atmospheric oxidation
, Answer: C
Rationale: Pitting corrosion causes highly localized metal loss and can quickly penetrate pipe
walls.
Question 6
Which environmental condition generally increases the corrosion rate of buried steel pipelines?
A. Dry, nonconductive soil
B. Moist soil with dissolved salts
C. Vacuum conditions
D. Thick concrete encasement
Answer: B
Rationale: Moist, conductive soils containing salts accelerate electrochemical corrosion.
Question 7
What is the primary purpose of applying protective coatings to buried steel pipelines?
A. Increase gas flow velocity.
B. Electrically isolate the steel from the surrounding environment.
C. Reduce operating pressure.
D. Improve pipeline flexibility.
Answer: B
Rationale: Coatings prevent soil from contacting steel, reducing corrosion exposure.
Question 8
