Gas Piping Systems Flashcards
6 cards from real 306A practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Gas Piping Systems flashcards as text
What is the purpose of a gas appliance connector (flex connector)?
Answer: To provide a flexible, movable connection between the rigid gas supply piping and the appliance, allowing for positioning and vibration isolation
A gas appliance connector is a flexible, corrugated metal hose that connects the rigid gas piping to the appliance. It allows slight movement for appliance positioning, absorbs vibration, and simplifies appliance installation and removal.
What is the maximum length typically allowed for a gas appliance connector?
Answer: 1.8 m (6 feet)
Gas appliance connectors are typically limited to a maximum length of 1.8 m (6 feet) to minimize the risk of kinking, damage, and excessive gas volume in the flexible connection.
Why must gas piping never be used as an electrical ground?
Answer: An electrical fault could create a spark at a gas pipe joint, potentially igniting gas leaking from that joint
Using gas piping as an electrical ground creates the risk of arcing or sparking at pipe joints if an electrical fault occurs. If gas is leaking at or near that joint, the spark could ignite the gas, causing an explosion or fire.
What is the minimum clearance between a gas pipe and an electrical wire or conduit running parallel?
Answer: 25 mm (1 inch)
A minimum clearance of 25 mm (1 inch) is typically required between gas piping and electrical wiring or conduit running in parallel to prevent accidental contact and potential arcing.
What is the proper procedure for sizing a gas supply line for a new gas range?
Answer: Determine the appliance BTU rating, measure the pipe length from the meter, account for fittings, and use the gas pipe sizing table
Gas pipe sizing requires knowing the appliance's BTU input rating, the total developed length of pipe from the meter (including equivalent lengths for all fittings), and referencing the appropriate sizing table for the gas type and supply pressure.
When installing gas piping through a concrete wall or floor, what protection is required?
Answer: The gas pipe must pass through a sleeve or casing to prevent direct contact with the concrete
Gas piping passing through concrete must be sleeved to prevent direct contact with the concrete, which can corrode the pipe. The sleeve also allows for slight pipe movement and prevents the concrete from damaging the pipe over time.