How far must the discharge from a container pressure relief device be from any openings?

The correct choice indicates that the discharge from a container pressure relief device must be positioned at least 3 feet horizontally or below any openings. This requirement is crucial for safety reasons. The purpose of the pressure relief device is to safely release excess pressure from a propane container, preventing dangerous situations such as explosions.

By ensuring that the discharge is at least 3 feet away from any openings, such as windows, doors, or vent stacks, it minimizes the risk of propane entering buildings or enclosed spaces. Propane is heavier than air, and if it were to escape near an opening, it could accumulate and create a hazardous environment. This distance helps protect against the potential for flammable gases to enter areas where they could ignite, ensuring the safety of both property and individuals nearby.

Safety regulations and best practices dictate these requirements to effectively manage and mitigate risks associated with propane storage and usage.