Journeyman Plumber ExamPlumbing Code and RegulationsMedium
A plumber is installing a new natural gas appliance in a residential property. The local gas code requires that all gas piping, other than listed appliance connectors, must be rigidly supported. What is the maximum horizontal spacing for supports for 1/2-inch (15 mm) steel gas piping?
- A6 feet (1.8 meters)
- B4 feet (1.2 meters)
- C8 feet (2.4 meters)
- D10 feet (3.0 meters)
Show answer & explanationAnswer & explanation
Correct answer: A. 6 feet (1.8 meters)
According to the International Fuel Gas Code (IFGC) or similar codes, 1/2-inch (15 mm) steel gas piping requires support at maximum intervals of 6 feet (1.8 meters).
Why the other options are wrong
- B. 4 feet is a common support distance for smaller tubing, but not typically for 1/2-inch steel pipe.
- C. 8 feet is too long for 1/2-inch steel gas piping; it's often for larger pipe sizes.
- D. 10 feet is typically for larger diameter gas piping, not 1/2-inch.
Gas Piping Support Spacing
The maximum allowable distance between supports for gas piping to ensure stability, prevent sagging, and maintain proper pitch.
- Varies by pipe material (steel, copper, CSST) and diameter.
- Required by fuel gas codes (IFGC, NFPA 54).
- Ensures safety and longevity of the gas distribution system.
Memory trick: Six Feet for Steel, Keep Gas Safe and Real!