What is the maximum allowable distance for a propane line to run vertically upward?

The correct answer indicates that a vertical run of a propane line should not exceed 20 feet without implementing proper venting. This requirement is rooted in safety practices and regulations regarding the handling of propane, which is a flammable gas. When propane is transported through a vertical line, particularly over a distance greater than 20 feet, there is an increased risk of pressure build-up and condensation forming within the line. Both of these factors can lead to potential hazards such as gas leaks or failure of the line, which could result in fire or explosion risk.

Proper venting is essential for managing pressure and ensuring that any excess gas can escape safely. This not only mitigates risks associated with pressure variances but also helps maintain the integrity of the propane distribution system. Thus, adhering to the specification about the 20-foot limit without proper venting is a critical safety protocol for technicians working with propane systems.