Safety and safety relief valves are set according to which specification?

The correct choice is based on the fact that safety and safety relief valves are primarily designed to operate within the parameters specified on their nameplate. This nameplate pressure rating indicates the maximum pressure the valve can safely handle, ensuring that during normal operations or system upsets, the valve will function as intended to prevent overpressure conditions. Utilizing this nameplate pressure rating is crucial for maintaining safety and compliance with mechanical code standards.

Setting these valves according to the nameplate ensures that they can effectively protect the system while conforming to manufacturer specifications, industry standards, and safety regulations. Consequently, it is paramount for professionals to reference this rating when configuring or installing safety or relief valves to ensure proper function and the safety of the entire system. Other options like maximum operating pressure and manufacturer's rating can serve as additional guidelines but do not take precedence over the definitive nameplate pressure rating.