GPT Inspection & Quality Control 3 — Questions and Answers
Question 1: When inspecting a gas meter installation, which clearance from electrical equipment is typically required by code?
- 3 feet from electrical meters and panels (Correct answer)
- 1 foot from any electrical device
- 6 inches if equipment is in a weatherproof enclosure
- No minimum clearance is specified
Correct answer: 3 feet from electrical meters and panels
Gas meters must maintain a minimum 3-foot clearance from electrical panels, meters, and other ignition sources per NFPA 54.
Question 2: During a final inspection of a gas piping system, the inspector discovers the pipe was not sloped toward a drip leg. What problem could this cause?
- Moisture accumulation in the piping that can block gas flow and damage appliances (Correct answer)
- Excessive gas velocity leading to pipe erosion
- Inadequate pressure at the appliance connection
- Over-pressurization of the downstream system
Correct answer: Moisture accumulation in the piping that can block gas flow and damage appliances
Without proper slope toward a drip leg, condensate and liquid contaminants accumulate in the pipe, potentially blocking flow or damaging appliance controls.
Question 3: What is the correct procedure for testing a gas system that cannot be isolated from the meter during a pressure test?
- Cap the meter inlet and test downstream piping at the allowable test pressure
- Test at reduced pressure with the meter in place using a certified gauging method
- Notify the gas utility and coordinate a temporary service interruption (Correct answer)
- Use liquid leak detection only without pressure testing
Correct answer: Notify the gas utility and coordinate a temporary service interruption
When the system cannot be isolated from the meter, the gas utility must be notified to arrange a temporary service interruption so testing can proceed safely.
Question 4: An inspector notices that black iron pipe is installed in a location exposed to weather without any protective coating. Which action is required?
- Apply an approved corrosion-resistant coating or replace with a listed outdoor-rated pipe (Correct answer)
- Wrap the pipe with electrical tape as a temporary fix
- Document the finding and schedule a re-inspection in 90 days
- Approve the installation if no active rust is present
Correct answer: Apply an approved corrosion-resistant coating or replace with a listed outdoor-rated pipe
Black iron pipe exposed to weather must be coated with an approved corrosion-resistant material to prevent deterioration and potential failure.
Question 5: Which document must be completed and retained after a successful gas piping pressure test in a commercial installation?
- A signed test record including test pressure, duration, gauge ID, and technician name (Correct answer)
- A verbal confirmation to the building owner only
- A photo of the gauge at the end of the test
- A utility notification form only
Correct answer: A signed test record including test pressure, duration, gauge ID, and technician name
A formal test record with test pressure, hold duration, gauge identification, and the technician's signature is required for commercial installations for AHJ documentation.
Question 6: During a quality audit, a technician discovers flexible gas connectors longer than 6 feet connecting appliances. What is the correct response?
- Replace the connectors with shorter ones that comply with the 6-foot maximum limit (Correct answer)
- Coil the excess length and secure it with zip ties
- Leave in place if the connector is listed and no kinks are present
- Add a union fitting mid-connector to comply
Correct answer: Replace the connectors with shorter ones that comply with the 6-foot maximum limit
NFPA 54 limits flexible gas connectors to 6 feet maximum; connectors exceeding this must be replaced with compliant-length connectors.
Question 7: When conducting a leakage survey on a buried gas distribution main, which instrument is the primary detection tool?
- Combustible gas detector (CGI) sampling from bar holes or surface (Correct answer)
- Pressure gauge at the main isolation valve
- Soap bubble solution applied at surface grade
- Infrared camera survey from above ground
Correct answer: Combustible gas detector (CGI) sampling from bar holes or surface
A combustible gas indicator (CGI) sampling from bar holes drilled to the pipe zone or from surface sniffing is the primary method for buried main leak surveys.
GPT Inspection & Quality Control 3
When inspecting a gas meter installation, which clearance from electrical equipment is typically required by code?