Failure to purge when necessary can cause?

The correct answer highlights a critical aspect of managing gas systems. When a system is not purged correctly, it can lead to odor fade, which diminishes the ability to detect gas leaks. This occurs because the accumulation of gases or undesired substances can obscure the presence of an odorant, making it less effective. Additionally, failure to purge may result in false pressure readings, which can mislead operators about the actual conditions within the system.

While increased tank pressure, corrosion of the tank, and gas leaks are important safety concerns related to gas management, they do not specifically address the immediate issues of detecting gas odors and ensuring accurate pressure monitoring, which are crucial for safe operations. Thus, the focus on odor fade and false pressure serves to emphasize the importance of proper purging practices in maintaining safety and operational integrity in gas systems.