Gas Pipe Technician (GPT) Certification — Questions and Answers

Question 1: Which test medium is preferred for leak testing gas piping systems?

Natural gas
Steam
Water
Air or inert gas (Correct answer)

Correct answer: Air or inert gas

Air or inert gas is preferred for pressure testing to eliminate explosion risk if a leak is discovered during the test.

Question 2: Which federal regulation governs corrosion control requirements for gas transmission and distribution pipelines in the United States?

49 CFR Part 192 Subpart I (Correct answer)
40 CFR Part 60
49 CFR Part 191
29 CFR Part 1926

Correct answer: 49 CFR Part 192 Subpart I

49 CFR Part 192 Subpart I specifically covers corrosion control requirements for gas pipeline facilities, including cathodic protection installation and monitoring.

Question 3: What is the purpose of a regulator lock-up test during commissioning?

Verify the regulator vents excess pressure safely
Verify the regulator shuts off gas at maximum flow
Verify the regulator resists physical damage
Verify the regulator maintains outlet pressure when there is no flow (Correct answer)

Correct answer: Verify the regulator maintains outlet pressure when there is no flow

A lock-up test confirms the regulator holds a stable outlet pressure when downstream flow stops, preventing over-pressurization.

Question 4: What is the standard test pressure for a gas piping system before commissioning per NFPA 54?

50 psi flat
10 psi flat
1.5 times the maximum allowable operating pressure (Correct answer)
Operating pressure only

Correct answer: 1.5 times the maximum allowable operating pressure

NFPA 54 requires pressure tests at 1.5 times the maximum allowable operating pressure to verify system integrity.

Question 5: Which type of signage must be posted at all access points to an area where a gas system is under pressure test?

"Danger – Pressure Test in Progress – Keep Out" warning signs (Correct answer)
No signage is required for pressure tests under 10 PSI
"Caution – Gas Odor" signs
"Wet Paint" signs to warn of fresh pipe coating

Correct answer: "Danger – Pressure Test in Progress – Keep Out" warning signs

Danger-level warning signs must be posted at all access points during pressure testing to prevent unauthorized personnel from entering the hazard zone.

Question 6: According to NFPA 54, gas piping must be tested with air, CO2, or nitrogen at what minimum pressure to be considered a valid strength test before gas is introduced?

1.5 psi for 10 minutes
10 psi for 60 minutes
1.5 times the maximum allowable operating pressure (Correct answer)
3 psi for 30 minutes

Correct answer: 1.5 times the maximum allowable operating pressure

NFPA 54 requires a strength test at 1.5 times the maximum allowable operating pressure to verify the piping system can safely handle normal operating conditions.

Question 7: Which documents must be completed and filed after successfully commissioning a gas piping system?

Appliance warranty cards
As-built drawings and pressure test records (Correct answer)
Material safety data sheet
Environmental impact report

Correct answer: As-built drawings and pressure test records

As-built drawings and pressure test records must be documented and retained for code compliance and future maintenance reference.

Question 8: What is the primary function of a gas meter?

Detect gas leaks
Filter contaminants from gas
Regulate gas pressure
Measure the volume of gas consumed (Correct answer)

Correct answer: Measure the volume of gas consumed

A gas meter measures the volume of gas flowing through it, which is used by the utility to calculate customer billing charges.

Question 9: Per 49 CFR Part 192, how often must a technician inspect and test rectifiers on impressed current cathodic protection systems serving gas pipelines?

Only after a reported corrosion event
Every 2 months (six times per calendar year) (Correct answer)
Every 5 years
Annually

Correct answer: Every 2 months (six times per calendar year)

49 CFR 192.613 and 192.465 require that impressed current CP rectifiers be inspected and tested at least six times each calendar year, with intervals not exceeding 2½ months.

Question 10: Which soil characteristic most increases the external corrosion risk for a buried steel gas pipeline?

Dry, sandy, well-drained soil
Low soil resistivity (below 1,000 ohm-cm) (Correct answer)
High soil resistivity (above 10,000 ohm-cm)
Neutral soil pH of 7.0

Correct answer: Low soil resistivity (below 1,000 ohm-cm)

Low soil resistivity indicates a highly conductive (often wet, clay-rich, or contaminated) environment that promotes electrochemical corrosion of buried metal.

Question 11: A turbine meter is best suited for which application?

High-flow commercial or industrial applications (Correct answer)
Low-flow residential service
Outdoor portable gas systems
Appliance-level monitoring

Correct answer: High-flow commercial or industrial applications

Turbine meters are designed for high-flow applications such as commercial and industrial facilities consuming large volumes of gas.

Question 12: Gas meters are typically sized based on:

The building's square footage
The total connected load of all appliances (Correct answer)
The number of rooms in the building
The pipe diameter only

Correct answer: The total connected load of all appliances

Meter size is determined by calculating the total BTU/hr input of all connected appliances and converting to the required CFH flow capacity.

Question 13: Which type of cathodic protection system uses an external DC power source to drive protective current onto a buried pipeline?

Impressed current system (Correct answer)
Sacrificial anode system
Galvanic bonding system
Passive isolation system

Correct answer: Impressed current system

An impressed current cathodic protection (ICCP) system uses a rectifier as an external DC power source to supply current through an anode to protect the pipeline.

Question 14: A manometer is used during pressure testing primarily to:

Calibrate the gas meter
Regulate gas pressure
Measure gas flow rate
Detect pressure changes indicating a leak (Correct answer)

Correct answer: Detect pressure changes indicating a leak

A manometer measures pressure precisely, allowing technicians to detect even small pressure drops that signal a leak.

Question 15: When locating a meter set installation, the minimum clearance from electrical meters and panels is:

10 feet
5 feet
3 feet (Correct answer)
1 foot

Correct answer: 3 feet

Gas meters must be installed at least 3 feet from electric meters, panel boards, and service equipment to prevent ignition hazards.

Question 16: Which document provides the industry standard guidelines for external corrosion control of underground or submerged metallic piping systems?

ASME B31.8
NACE SP0169 (now AMPP SP0169) (Correct answer)
API 1104
OSHA 29 CFR 1910.119

Correct answer: NACE SP0169 (now AMPP SP0169)

NACE SP0169 (now published under AMPP) is the primary industry standard for control of external corrosion on underground or submerged metallic piping systems.

Question 17: When installing an outdoor gas meter, what is the minimum horizontal clearance required from an electrical meter or panel?

3 feet (Correct answer)
5 feet
10 feet
1 foot

Correct answer: 3 feet

Gas meters must be installed at least 3 feet horizontally from electrical meters, panels, and service entrances to reduce ignition risk from electrical arcing.

Question 18: What procedure must be performed after pressure testing before gas is introduced into a new system?

Flushing with water
Purging with inert gas (Correct answer)
Hydraulic pressure test
Chemical cleaning

Correct answer: Purging with inert gas

Purging with inert gas displaces air and moisture from the piping to prevent combustible air-gas mixtures when gas is introduced.

Question 19: How does collaboration enhance Troubleshooting & Diagnostics in Gas Pipe Technician Certification?

It reduces individual accountability
It slows down the process
It brings diverse perspectives and improves outcomes (Correct answer)
It creates unnecessary meetings

Correct answer: It brings diverse perspectives and improves outcomes

Collaboration brings together different viewpoints and expertise, leading to better decision-making and outcomes.

Question 20: A gas meter that over-registers means:

The meter pressure is too high
The meter reads less gas than was actually consumed
The meter reads more gas than was actually consumed (Correct answer)
The meter has stopped working

Correct answer: The meter reads more gas than was actually consumed

An over-registering meter records a higher volume than actually passed through it, causing the customer to be overbilled for gas not used.

Question 21: Under ICC IFGC, a sediment trap (drip leg) must be installed in the gas supply line to an appliance:

Only when the appliance uses LP gas
Downstream of the appliance pressure regulator
Upstream of the appliance shutoff valve (Correct answer)
Only on commercial appliances

Correct answer: Upstream of the appliance shutoff valve

The IFGC requires sediment traps upstream of the appliance shutoff valve to catch debris before it reaches control valves.

Question 22: A meter set assembly typically includes which combination of components?

Pump, meter, and flow controller
Regulator, meter, and service valve (Correct answer)
Compressor, filter, and meter
Meter, heat exchanger, and sensor

Correct answer: Regulator, meter, and service valve

A standard meter set assembly includes a service regulator to reduce pressure, the meter to measure flow, and a service valve for isolation.

Question 23: Which document must a technician review before performing maintenance on a gas system in a commercial building?

The local fire department contact list
The building's fire alarm test records
The tenant occupancy schedule
The as-built piping drawings and any prior inspection reports (Correct answer)

Correct answer: The as-built piping drawings and any prior inspection reports

As-built drawings show actual pipe routing, sizes, and valve locations, which is critical for safe and accurate maintenance.

Question 24: What is the significance of checking gas pipe system bonding and grounding during a PM inspection?

Bonding is checked only during new installations, not PM
Grounding is only needed on plastic pipe systems
Bonding is only required for electrical panels, not gas pipes
Proper bonding prevents static electricity buildup that can ignite gas leaks (Correct answer)

Correct answer: Proper bonding prevents static electricity buildup that can ignite gas leaks

Gas piping must be bonded to the electrical grounding system to dissipate static charges that could ignite escaping gas.

Question 25: What is the purpose of a tracer wire installed alongside buried gas piping?

To provide cathodic protection to the pipe
To carry low-voltage signals for leak detection
To serve as a bonding conductor for the gas system
To allow the buried pipe to be located with a locating device (Correct answer)

Correct answer: To allow the buried pipe to be located with a locating device

Tracer wire is installed alongside buried plastic pipe to allow future electromagnetic locating of the pipe's exact position.

Question 26: What is the purpose of an electrical isolation fitting (insulating union or flange) installed on a buried gas service line?

To provide a test point for leak detection
To electrically isolate the service line from the customer's piping and prevent CP current loss (Correct answer)
To reduce gas flow velocity at the meter
To act as a pressure regulator at the service entrance

Correct answer: To electrically isolate the service line from the customer's piping and prevent CP current loss

Isolation fittings prevent cathodic protection current from draining off the protected main into unprotected customer piping, ensuring CP current stays on the intended structure.

Question 27: What test is required to verify the integrity of a gas piping system before it is placed into service?

Flow test with gas at operating pressure
Hydrostatic pressure test with water
Visual inspection only
Pressure test using air, CO2, or nitrogen at required test pressure (Correct answer)

Correct answer: Pressure test using air, CO2, or nitrogen at required test pressure

Gas piping must be pressure-tested with an inert gas (air, nitrogen, or CO2) before being placed into service to detect leaks without using combustible gas.

Question 28: Which instrument is used to measure pipe-to-soil potential for cathodic protection surveys?

High-impedance digital voltmeter with a reference electrode (Correct answer)
High-voltage holiday detector
Clamp-on ammeter
Megohmmeter

Correct answer: High-impedance digital voltmeter with a reference electrode

A high-impedance voltmeter connected between the pipe and a copper/copper sulfate reference electrode (CSE) placed on the soil surface measures pipe-to-soil potential.

Question 29: A quality control inspector is reviewing installed pipe hangers on a 1-inch gas supply line. What is the maximum hanger spacing allowed under NFPA 54 for this pipe size?

Every 6 feet
Every 10 feet (Correct answer)
Every 15 feet
Every 4 feet

Correct answer: Every 10 feet

NFPA 54 requires supports for 1-inch gas pipe at intervals not exceeding 10 feet to prevent sagging and stress on joints.

Question 30: What is the purpose of a pressure regulator at the meter set?

Reduce distribution line pressure to a safe service pressure (Correct answer)
Measure gas consumption
Increase gas pressure for appliances
Filter moisture from the gas

Correct answer: Reduce distribution line pressure to a safe service pressure

The service regulator reduces high distribution main pressure to the lower, safe working pressure required for customer service connections.

Gas Pipe Technician (GPT) Certification

The Gas Pipe Technician certification validates competency in natural gas distribution systems, covering safe installation practices, corrosion control, cathodic protection, gas metering and measurement, pressure testing, system commissioning, and leak detection procedures.

Questions

35 min

Time Limit

70%

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