A low-pressure boiler is defined as having a maximum working pressure of what value?

A low-pressure boiler is typically defined as having a maximum working pressure of 15 PSI. This classification is important for safety, regulation, and operation purposes. In the context of low-pressure boilers, the term refers to the operational limits that dictate different safety requirements and maintenance protocols compared to higher-pressure systems.

Understanding the maximum working pressure is critical for ensuring that the boiler operates efficiently and safely within its designated parameters. This classification helps establish the necessary inspections, permissible materials, and components used in the boiler's construction and operation.

Meanwhile, other pressure limits outlined in the choices, such as 30 PSI, 10 PSI, and 5 PSI, do not align with the standard definition for a low-pressure boiler, with the established maximum being 15 PSI. These values may be relevant for other classifications or types of boilers but are not appropriate when defining low-pressure boilers specifically.