What pressure should a low-pressure boiler be set to for its pressure-relief valve to open?

A low-pressure boiler is typically set to have a pressure-relief valve that opens at 15 psi. This is a standard safety measure in low-pressure boiler systems, which are commonly defined as those operating at pressures less than 15 psi. The pressure-relief valve is a crucial component, as it serves to protect the boiler from excessive pressure that could lead to failure or catastrophic incidents.

When the pressure within the boiler reaches 15 psi, the pressure-relief valve opens to allow steam and water to escape, preventing further pressure buildup. This ensures the safe operation of the boiler and protects both the equipment and anyone in proximity to it. Setting the pressure-relief valve at this standard level aligns with industry regulations and safety standards, ensuring consistent and safe operation across various boiler systems.

In contrast, lower or higher pressure settings, such as 10 psi, 12 psi, or 20 psi, do not conform to the typical requirements for low-pressure boiler systems, thus making 15 psi the appropriate and correct choice for this scenario.