What defines a "Low Pressure Boiler"?

A "Low Pressure Boiler" is defined by its operating pressure, which is at or below 15 pounds per square inch gauge (psig). This classification is important for ensuring safety and compliance with regulations. Boilers operating at 15 psig or less are typically used for heating and domestic hot water systems, which do not require the higher pressures associated with medium or high-pressure boilers.

Understanding this classification is essential, as it directly affects the design, maintenance, and operational standards that must be followed. Low pressure boilers have different requirements compared to those operating at higher pressures, influencing aspects such as the types of safety valves, controls, and operational procedures needed to ensure safe operation.

In contrast, operating at pressures above 15 psig would categorize a boiler as either a medium or high-pressure boiler, which entails different regulations and safety considerations. The temperature at which a boiler operates cannot singularly define it as low pressure; rather, it is the pressure that is the determining factor.