Exam Practice Questions And Correct

Oil & Gas Pipeline Technician Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a pipeline pig?
• Measure soil resistivity
• Clean and inspect the interior of a pipeline
• Remove corrosion from valves
• Increase product pressure

Rationale: Pigs are used for cleaning, inspection, and assessing pipeline

integrity.

• Which federal agency regulates interstate natural gas pipelines in the

United States?

A. EPA

B. PHMSA

C. DOE

D. OSHA 1 / 4

Rationale: PHMSA oversees pipeline safety for interstate hazardous liquids

and natural gas.

• What is cathodic protection designed to prevent?
• Overpressure
• Pigging malfunctions
• External corrosion
• Flow restriction

Rationale: CP systems supply electrons to the pipe to reduce corrosion

reactions.

• What does SCADA stand for?
• System Control and Data Application
• Supervisory Calibration and Data Analysis
• Supervisory Control and Data Acquisition
• Sensor Calibration and Diagnostics Array

Rationale: SCADA systems remotely monitor and control pipeline

operations.

• Which pipe material is most commonly used for high-pressure

transmission pipelines?

A. PVC

• Copper
• Aluminum
• Carbon steel 2 / 4

Rationale: Carbon steel provides strength and durability for high-pressure

transport.

• What is the primary hazard of a natural gas leak?
• Frostbite
• Explosion or fire
• Radiation
• Flooding

Rationale: Natural gas is highly flammable and can ignite easily when

mixed with air.

• Which test verifies weld integrity before pipeline operation?
• Radiographic weld test
• Dye penetrant test
• Ultrasonic thickness test
• Hydrostatic pressure test

Rationale: Hydrostatic tests pressurize the pipeline to confirm strength and

leak tightness.

8. A pipeline’s MAOP refers to:

• Maximum average oxidation pressure
• Minimum allowable operational pressure
• Maximum analysis operational power
• Maximum allowable operating pressure 3 / 4

Rationale: MAOP is the highest operating pressure allowed under

regulations.

• Which tool is used to locate buried pipelines?
• Torque wrench
• Thermal imager
• Electromagnetic line locator
• Tachometer

Rationale: Locators detect the signal placed on underground metallic

pipes.

• What is the primary function of a block valve?
• Measure flow
• Pig launching
• Pressure reducing
• Isolate pipeline sections

Rationale: Block valves allow isolation during maintenance or

emergencies.

• Which gas is commonly added to natural gas for odorization?
• Methane
• Mercaptan
• Ethane
• Oxygen
• / 4