How should pressure relief devices on ASME containers be installed to ensure proper gas venting?

The correct choice emphasizes the importance of proper installation of pressure relief devices on ASME containers to ensure safe and effective venting of gas. Pressure relief devices are critical in preventing overpressure within the container, which could lead to hazardous situations.

Installing the device away from the container ensures that any gas vented does not contribute to potential pressure buildup in the vicinity of the container itself, thus maintaining a safe environment. Directing the vent upward allows gas to disperse into the atmosphere more efficiently, as lighter-than-air gases will rise and diffuse quickly, reducing the risk of accumulation that could lead to explosions or fires. Being unobstructed means there are no barriers to gas flow, which is critical for ensuring that the pressure relief device can function as intended during an overpressure event.

This installation methodology enhances safety by promoting effective gas venting, minimizing risks associated with overpressure scenarios.