What is the minimum termination distance for a purge line from a building or air intake?

The correct answer is based on safety and regulatory requirements aimed at preventing the accumulation of gas concentrations near buildings or air intakes. A minimum termination distance of 20 feet for a purge line ensures that any gas released during purging is adequately dispersed before it can potentially re-enter a building or affect ventilation systems. This distance reduces the risk of gas accumulating near the structure where it could pose an explosion or asphyxiation hazard.

Regulatory standards typically take into consideration environmental factors like wind patterns and the proximity of windows or ventilation points, reinforcing the need for a buffer zone that extends to 20 feet. This precaution helps maintain safety for occupants and prevents disruption to air quality standards within buildings. Therefore, adhering to this requirement is crucial for effective risk management in gas handling and purging operations.