Alberta Gasfitter – Class A Certification
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a flame safeguard system on a large
commercial gas appliance?
A. Reduce NOx emissions
B. Control combustion air
C. Prevent uncontrolled fuel flow
D. Provide ignition voltage
Rationale: Flame safeguard systems verify flame presence and shut down
fuel flow if the flame fails to prevent explosions or raw gas release.
2. What is the maximum allowed operating pressure for a Class A gasfitter
without additional certification?
A. 14 kPa
B. 70 kPa
C. 100 kPa
D. Unlimited, as allowed by manufacturer and code
Rationale: Class A certification allows work on any size or pressure of gas
system as defined by code and manufacturer.
,3. Which gas is most commonly used as the odorant in natural gas
distribution?
A. Methane
B. Propane
C. Mercaptan compounds
D. Nitrogen
Rationale: Mercaptans impart the distinct smell necessary for leak
detection.
4. In Alberta, the CSA B149.1 code applies primarily to:
A. Small appliance servicing only
B. Natural gas and propane installation and equipment
C. Gas pipelines
D. Electrical systems for appliances
Rationale: CSA B149.1 governs installation and maintenance of gas
systems.
5. A high-pressure regulator reducing pressure from 300 psi must include
which safety component?
A. Flame rod sensor
B. Relief valve
C. Pilot shutoff
D. Pressure switch
Rationale: High-pressure regulators require relief valves to prevent
overpressure.
, 6. The minimum burial depth for underground gas piping in Alberta is
generally:
A. 150 mm
B. 600 mm
C. 1 m
D. 1.5 m
Rationale: Gas piping must be buried deep enough to prevent mechanical
damage, typically 600 mm.
7. Combustion air for a 1,000,000 BTU/hr appliance must be sized based
on:
A. Stack height
B. Regulator capacity
C. Total appliance input rating
D. Gas pressure
Rationale: Combustion air is calculated using total input BTU.
8. What is the main purpose of a drip leg in a gas piping system?
A. Odorant injection
B. Pressure relief
C. Meter support
D. Collection of condensate and debris
Rationale: Drip legs trap moisture and debris to protect appliance valves.
9. The ignition temperature of natural gas is approximately:
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a flame safeguard system on a large
commercial gas appliance?
A. Reduce NOx emissions
B. Control combustion air
C. Prevent uncontrolled fuel flow
D. Provide ignition voltage
Rationale: Flame safeguard systems verify flame presence and shut down
fuel flow if the flame fails to prevent explosions or raw gas release.
2. What is the maximum allowed operating pressure for a Class A gasfitter
without additional certification?
A. 14 kPa
B. 70 kPa
C. 100 kPa
D. Unlimited, as allowed by manufacturer and code
Rationale: Class A certification allows work on any size or pressure of gas
system as defined by code and manufacturer.
,3. Which gas is most commonly used as the odorant in natural gas
distribution?
A. Methane
B. Propane
C. Mercaptan compounds
D. Nitrogen
Rationale: Mercaptans impart the distinct smell necessary for leak
detection.
4. In Alberta, the CSA B149.1 code applies primarily to:
A. Small appliance servicing only
B. Natural gas and propane installation and equipment
C. Gas pipelines
D. Electrical systems for appliances
Rationale: CSA B149.1 governs installation and maintenance of gas
systems.
5. A high-pressure regulator reducing pressure from 300 psi must include
which safety component?
A. Flame rod sensor
B. Relief valve
C. Pilot shutoff
D. Pressure switch
Rationale: High-pressure regulators require relief valves to prevent
overpressure.
, 6. The minimum burial depth for underground gas piping in Alberta is
generally:
A. 150 mm
B. 600 mm
C. 1 m
D. 1.5 m
Rationale: Gas piping must be buried deep enough to prevent mechanical
damage, typically 600 mm.
7. Combustion air for a 1,000,000 BTU/hr appliance must be sized based
on:
A. Stack height
B. Regulator capacity
C. Total appliance input rating
D. Gas pressure
Rationale: Combustion air is calculated using total input BTU.
8. What is the main purpose of a drip leg in a gas piping system?
A. Odorant injection
B. Pressure relief
C. Meter support
D. Collection of condensate and debris
Rationale: Drip legs trap moisture and debris to protect appliance valves.
9. The ignition temperature of natural gas is approximately:
