Where should pressure relief valves discharge according to NFPA 52?

The requirement for pressure relief valves to discharge in a location where escaping gas does not impinge on people or structures is crucial for ensuring safety. This provision is stipulated by NFPA 52, which is the National Fire Protection Association's code focused on vehicles fueled by compressed natural gas (CNG) and the associated infrastructure.

Discharging in a safe location minimizes the potential hazards associated with escaping gas. By directing the discharge away from people and structures, the risk of fire, explosion, or exposure to harmful gas is significantly reduced. Proper discharge locations may include certain open areas where the gas can disperse safely into the atmosphere without accumulating in confined spaces.

In contrast, other options do not align with safety standards. Discharging into the storage container (the first choice) could lead to overpressure and pose a safety risk. Directly discharging onto the ground (the third choice) may also create hazards, especially if it accumulates in low-lying areas or near ignition sources. Discharging into other nearby containers (the fourth choice) does not address the need for safety distance and could increase the risk of multiple container failures or gas accumulation. Thus, adhering to NFPA 52 guidelines for safe discharge locations is essential for protecting both individuals and property.