A miniature boiler has a maximum allowable working pressure (MAWP) of less than how many PSI?

A miniature boiler is defined primarily by its maximum allowable working pressure (MAWP) and its physical size. According to regulations, a miniature boiler has an MAWP that is less than 100 PSI. This classification is significant because it dictates the boiler's design, safety requirements, and operational standards.

A boiler with an MAWP of less than 100 PSI falls under various simplified regulations when compared to larger, high-pressure boilers, which typically have higher maize allowed working pressures and a wider array of safety and performance standards.

In contrast, while MAWPs of 50, 75, and 150 PSI are mentioned, they do not correctly align with the definition of a miniature boiler in relation to the 100 PSI threshold. The regulation distinguishes that anything under 100 PSI is a miniature boiler, making it crucial for those working in boiler operations or safety inspections to clearly understand these classifications and their operational implications.