Gas Piping and Venting Flashcards
7 cards from real Journeyman Plumbers Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Gas Piping and Venting flashcards as text
When installing a gas range in a kitchen, the flexible connector used must NOT exceed what length?
Answer: 6 feet
Appliance connectors for gas ranges and similar equipment must not exceed 6 feet in length per NFPA 54.
Natural gas has a specific gravity approximately:
Answer: Lighter than air (specific gravity less than 1.0)
Natural gas (primarily methane) has a specific gravity of about 0.6, making it lighter than air so it rises and dissipates upward.
A gas vent that serves only one appliance and terminates through an exterior wall using an approved through-the-wall kit is known as:
Answer: A direct-vent (sealed combustion) system
A direct-vent (sealed combustion) appliance draws combustion air from outside and exhausts directly through the wall, using a coaxial or two-pipe assembly.
Which of the following conditions ALWAYS requires a licensed plumber or gas fitter to obtain a permit before work begins?
Answer: Installing new gas piping or extending an existing gas line
Any new gas piping installation or extension of an existing gas system requires a permit to ensure the work is inspected and meets code.
What is the minimum horizontal distance a gas meter must be located from an electrical meter or service panel?
Answer: 3 feet
Gas meters must be installed at least 3 feet horizontally from electrical meters and service equipment to reduce ignition risk.
A plumber notices a gas odor while working in a building. The FIRST action should be:
Answer: Evacuate the building and call the gas company from outside
Evacuating and calling the utility from a safe location is the correct first response — do not operate switches or fans that could ignite accumulated gas.
A gas dryer vent (exhaust) must be made of:
Answer: Rigid or semi-rigid metal duct
Gas dryer exhaust must use rigid or semi-rigid metal duct — not plastic — because of the heat and potential for fire.