CPA Pipeline Operations & Integrity 1 — Questions and Answers
Question 1: Which U.S. federal agency regulates the safety of natural gas and hazardous liquid pipelines?
- Federal Energy Regulatory Commission (FERC)
- Pipeline and Hazardous Materials Safety Administration (PHMSA) (Correct answer)
- Department of Energy (DOE)
- Bureau of Safety and Environmental Enforcement (BSEE)
Correct answer: Pipeline and Hazardous Materials Safety Administration (PHMSA)
PHMSA, within the U.S. Department of Transportation, sets and enforces safety standards for the nation's gas and hazardous liquid pipeline systems.
Question 2: What is the purpose of a 'pig' in pipeline operations?
- A pressure relief device installed at compressor stations
- A tool inserted into the pipeline for cleaning, inspection, or separation (Correct answer)
- A valve used to isolate pipeline sections during maintenance
- A chemical injected to prevent corrosion inside the pipe
Correct answer: A tool inserted into the pipeline for cleaning, inspection, or separation
Pipeline pigs are devices that travel through a pipeline driven by product flow to perform cleaning, product separation, or in-line inspection (smart pigs).
Question 3: Cathodic protection is used on buried steel pipelines primarily to prevent what?
- Blockages from wax or hydrate buildup
- External corrosion caused by electrochemical reactions with soil (Correct answer)
- Internal erosion from high-velocity flow
- Thermal expansion stress fractures
Correct answer: External corrosion caused by electrochemical reactions with soil
Cathodic protection applies electrical current to make the pipe a cathode, suppressing the electrochemical reactions that cause external corrosion of buried steel.
Question 4: What does MAOP stand for in pipeline operations?
- Maximum Allowable Operating Pressure (Correct answer)
- Minimum Acceptable Operating Protocol
- Maximum Annual Output Performance
- Monitored Asset Operating Procedure
Correct answer: Maximum Allowable Operating Pressure
MAOP is the Maximum Allowable Operating Pressure — the highest pressure at which a pipeline system may be operated under PHMSA regulations.
Question 5: Which method is used to test pipeline integrity before commissioning by filling the line with water and pressurizing it above MAOP?
- Ultrasonic thickness testing
- Hydrostatic pressure testing (Correct answer)
- Radiographic weld inspection
- Magnetic flux leakage testing
Correct answer: Hydrostatic pressure testing
Hydrostatic pressure testing fills the pipeline with water and raises pressure to 1.1–1.5× MAOP to verify structural integrity and detect leaks before placing the line in service.
Question 6: What is a 'High Consequence Area' (HCA) in the context of U.S. hazardous liquid pipeline regulations?
- A pipeline segment with a history of third-party damage
- An area where a pipeline failure could have significant adverse consequences on populated or sensitive areas (Correct answer)
- A geographic region with high seismic activity
- A pipeline zone requiring double wall construction
Correct answer: An area where a pipeline failure could have significant adverse consequences on populated or sensitive areas
HCAs are defined areas near pipelines — such as populated zones, drinking water sources, or ecological resources — where a release could have the most serious consequences, requiring enhanced integrity management.
CPA Pipeline Operations & Integrity 1
Which U.S. federal agency regulates the safety of natural gas and hazardous liquid pipelines?