What is the maximum allowable setting for a pressure relief valve?

The maximum allowable setting for a pressure relief valve typically aligns with industry standards and safety regulations. In this context, the correct option suggests either a maximum of 15 psi or 10% above the operating pressure. This guideline is grounded in the principle that pressure relief valves are designed to prevent excessive pressure build-up in systems, and their settings are typically configured to maintain safe operational parameters.

By allowing a setting that is either 15 psi or 10% above the normal operating pressure, it provides a system with flexibility while ensuring that the pressure remains within safe limits. This reduces the risk of equipment failure or hazardous situations that could arise from over-pressurization. System designers and operators must take into account the specific operating pressure of their equipment when determining the appropriate setting for the pressure relief valve, ensuring that it is adequately set to protect the overall system.