What is the maximum outlet pressure that a pressure relieving valve (PRV) is required to limit to according to NFPA?

According to NFPA standards, specifically NFPA 58 which governs the storage and handling of liquefied petroleum gases, the pressure relief valve (PRV) must limit the outlet pressure to a maximum of 100 psi. This regulation ensures that pressure does not exceed a level that can potentially lead to hazardous situations or equipment failure.

The establishment of this limit is based on safety considerations, where exceeding this pressure threshold can result in excessive stress on systems or components, leading to catastrophic failures. Moreover, by keeping the pressure at or below this level, the likelihood of incidents such as flashbacks or explosions is significantly reduced, enhancing safety for both personnel and property.

In contrast, the other options represent pressures that exceed this safety threshold, which do not conform to NFPA guidelines. The standard's focus is fundamentally on maintaining safe operating conditions and preventing accidents, hence the maximum pressure limit of 100 psi is critical in achieving these objectives.